Extract interfaces for all events.

This is in preparation for moving to event-impl-gen.

api/build.gradle

@@ -100,10 +100,6 @@ test {
     useJUnitPlatform()
 }
 
-test {
-    useJUnitPlatform()
-}
-
 publishing {
     publications {
         mavenJava(MavenPublication) {

api/src/main/java/com/velocitypowered/api/command/CommandManager.java

@@ -7,7 +7,7 @@
 
 package com.velocitypowered.api.command;
 
-import com.velocitypowered.api.event.command.CommandExecuteEvent;
+import com.velocitypowered.api.event.command.CommandExecuteEventImpl;
 import java.util.concurrent.CompletableFuture;
 
 /**
@@ -81,7 +81,7 @@ public interface CommandManager {
 
   /**
    * Attempts to asynchronously execute a command from the given {@code cmdLine}
-   * without firing a {@link CommandExecuteEvent}.
+   * without firing a {@link CommandExecuteEventImpl}.
    *
    * @param source the source to execute the command for
    * @param cmdLine the command to run

api/src/main/java/com/velocitypowered/api/event/command/CommandExecuteEvent.java

@@ -16,63 +16,22 @@ import org.checkerframework.checker.nullness.qual.NonNull;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
 /**
- * This event is fired when someone executing command.
+ * This event is fired when someone executes a command.
  */
-public final class CommandExecuteEvent implements ResultedEvent<CommandResult> {
+public interface CommandExecuteEvent extends ResultedEvent<CommandResult> {
 
-  private final CommandSource commandSource;
-  private final String command;
-  private CommandResult result;
+  CommandSource getCommandSource();
 
   /**
-   * Constructs a CommandExecuteEvent.
-   * @param commandSource the source executing the command
-   * @param command the command being executed without first slash
-   */
-  public CommandExecuteEvent(CommandSource commandSource, String command) {
-    this.commandSource = Preconditions.checkNotNull(commandSource, "commandSource");
-    this.command = Preconditions.checkNotNull(command, "command");
-    this.result = CommandResult.allowed();
-  }
-
-  public CommandSource getCommandSource() {
-    return commandSource;
-  }
-
-  /**
-   * Gets the original command being executed without first slash.
+   * Gets the original command being executed without the first slash.
    * @return the original command being executed
    */
-  public String getCommand() {
-    return command;
-  }
+  String getCommand();
 
-  @Override
-  public CommandResult getResult() {
-    return result;
-  }
+  final class CommandResult implements ResultedEvent.Result {
 
-  @Override
-  public void setResult(CommandResult result) {
-    this.result = Preconditions.checkNotNull(result, "result");
-  }
-
-  @Override
-  public String toString() {
-    return "CommandExecuteEvent{"
-        + "commandSource=" + commandSource
-        + ", command=" + command
-        + ", result=" + result
-        + '}';
-  }
-
-  /**
-   * Represents the result of the {@link CommandExecuteEvent}.
-   */
-  public static final class CommandResult implements ResultedEvent.Result {
-
-    private static final CommandResult ALLOWED = new CommandResult(true, false,null);
-    private static final CommandResult DENIED = new CommandResult(false, false,null);
+    private static final CommandResult ALLOWED = new CommandResult(true, false, null);
+    private static final CommandResult DENIED = new CommandResult(false, false, null);
     private static final CommandResult FORWARD_TO_SERVER = new CommandResult(false, true, null);
 
     private @Nullable String command;
@@ -105,6 +64,7 @@ public final class CommandExecuteEvent implements ResultedEvent<CommandResult> {
 
     /**
      * Allows the command to be sent, without modification.
+     *
      * @return the allowed result
      */
     public static CommandResult allowed() {
@@ -113,6 +73,7 @@ public final class CommandExecuteEvent implements ResultedEvent<CommandResult> {
 
     /**
      * Prevents the command from being executed.
+     *
      * @return the denied result
      */
     public static CommandResult denied() {
@@ -121,6 +82,7 @@ public final class CommandExecuteEvent implements ResultedEvent<CommandResult> {
 
     /**
      * Prevents the command from being executed, but forward command to server.
+     *
      * @return the forward result
      */
     public static CommandResult forwardToServer() {
@@ -129,6 +91,7 @@ public final class CommandExecuteEvent implements ResultedEvent<CommandResult> {
 
     /**
      * Prevents the command from being executed on proxy, but forward command to server.
+     *
      * @param newCommand the command without first slash to use instead
      * @return a result with a new command being forwarded to server
      */
@@ -139,6 +102,7 @@ public final class CommandExecuteEvent implements ResultedEvent<CommandResult> {
 
     /**
      * Allows the command to be executed, but silently replaced old command with another.
+     *
      * @param newCommand the command to use instead without first slash
      * @return a result with a new command
      */
@@ -147,4 +111,5 @@ public final class CommandExecuteEvent implements ResultedEvent<CommandResult> {
       return new CommandResult(true, false, newCommand);
     }
   }
+
 }

api/src/main/java/com/velocitypowered/api/event/command/CommandExecuteEventImpl.java

@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2018 Velocity Contributors
+ *
+ * The Velocity API is licensed under the terms of the MIT License. For more details,
+ * reference the LICENSE file in the api top-level directory.
+ */
+
+package com.velocitypowered.api.event.command;
+
+import com.google.common.base.Preconditions;
+import com.velocitypowered.api.command.CommandSource;
+
+/**
+ * This event is fired when someone executing command.
+ */
+public final class CommandExecuteEventImpl implements CommandExecuteEvent {
+
+  private final CommandSource commandSource;
+  private final String command;
+  private CommandResult result;
+
+  /**
+   * Constructs a CommandExecuteEvent.
+   * @param commandSource the source executing the command
+   * @param command the command being executed without first slash
+   */
+  public CommandExecuteEventImpl(CommandSource commandSource, String command) {
+    this.commandSource = Preconditions.checkNotNull(commandSource, "commandSource");
+    this.command = Preconditions.checkNotNull(command, "command");
+    this.result = CommandResult.allowed();
+  }
+
+  @Override
+  public CommandSource getCommandSource() {
+    return commandSource;
+  }
+
+  /**
+   * Gets the original command being executed without first slash.
+   * @return the original command being executed
+   */
+  @Override
+  public String getCommand() {
+    return command;
+  }
+
+  @Override
+  public CommandResult getResult() {
+    return result;
+  }
+
+  @Override
+  public void setResult(CommandResult result) {
+    this.result = Preconditions.checkNotNull(result, "result");
+  }
+
+  @Override
+  public String toString() {
+    return "CommandExecuteEvent{"
+        + "commandSource=" + commandSource
+        + ", command=" + command
+        + ", result=" + result
+        + '}';
+  }
+
+}

api/src/main/java/com/velocitypowered/api/event/command/PlayerAvailableCommandsEvent.java

@@ -7,9 +7,6 @@
 
 package com.velocitypowered.api.event.command;
 
-import static com.google.common.base.Preconditions.checkNotNull;
-
-import com.google.common.annotations.Beta;
 import com.mojang.brigadier.tree.RootCommandNode;
 import com.velocitypowered.api.proxy.connection.Player;
 
@@ -17,28 +14,9 @@ import com.velocitypowered.api.proxy.connection.Player;
  * Allows plugins to modify the packet indicating commands available on the server to a
  * Minecraft 1.13+ client.
  */
-@Beta
-public class PlayerAvailableCommandsEvent {
+public interface PlayerAvailableCommandsEvent {
 
-  private final Player player;
-  private final RootCommandNode<?> rootNode;
+  Player getPlayer();
 
-  /**
-   * Constructs an available commands event.
-   * @param player the targeted player
-   * @param rootNode the Brigadier root node
-   */
-  public PlayerAvailableCommandsEvent(Player player,
-      RootCommandNode<?> rootNode) {
-    this.player = checkNotNull(player, "player");
-    this.rootNode = checkNotNull(rootNode, "rootNode");
-  }
-
-  public Player getPlayer() {
-    return player;
-  }
-
-  public RootCommandNode<?> getRootNode() {
-    return rootNode;
-  }
+  RootCommandNode<?> getRootNode();
 }

api/src/main/java/com/velocitypowered/api/event/command/PlayerAvailableCommandsEventImpl.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2018 Velocity Contributors
+ *
+ * The Velocity API is licensed under the terms of the MIT License. For more details,
+ * reference the LICENSE file in the api top-level directory.
+ */
+
+package com.velocitypowered.api.event.command;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import com.google.common.annotations.Beta;
+import com.mojang.brigadier.tree.RootCommandNode;
+import com.velocitypowered.api.proxy.connection.Player;
+
+/**
+ * Allows plugins to modify the packet indicating commands available on the server to a
+ * Minecraft 1.13+ client.
+ */
+@Beta
+public class PlayerAvailableCommandsEventImpl implements PlayerAvailableCommandsEvent {
+
+  private final Player player;
+  private final RootCommandNode<?> rootNode;
+
+  /**
+   * Constructs an available commands event.
+   * @param player the targeted player
+   * @param rootNode the Brigadier root node
+   */
+  public PlayerAvailableCommandsEventImpl(Player player,
+      RootCommandNode<?> rootNode) {
+    this.player = checkNotNull(player, "player");
+    this.rootNode = checkNotNull(rootNode, "rootNode");
+  }
+
+  @Override
+  public Player getPlayer() {
+    return player;
+  }
+
+  @Override
+  public RootCommandNode<?> getRootNode() {
+    return rootNode;
+  }
+}

api/src/main/java/com/velocitypowered/api/event/connection/ConnectionHandshakeEvent.java

@@ -7,28 +7,9 @@
 
 package com.velocitypowered.api.event.connection;
 
-import com.google.common.base.Preconditions;
-import com.velocitypowered.api.proxy.connection.InboundConnection;
-
 /**
  * This event is fired when a handshake is established between a client and the proxy.
  */
-public final class ConnectionHandshakeEvent {
+public interface ConnectionHandshakeEvent {
 
-  private final InboundConnection connection;
-
-  public ConnectionHandshakeEvent(InboundConnection connection) {
-    this.connection = Preconditions.checkNotNull(connection, "connection");
-  }
-
-  public InboundConnection getConnection() {
-    return connection;
-  }
-
-  @Override
-  public String toString() {
-    return "ConnectionHandshakeEvent{"
-        + "connection=" + connection
-        + '}';
-  }
 }

api/src/main/java/com/velocitypowered/api/event/connection/ConnectionHandshakeEventImpl.java

@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2018 Velocity Contributors
+ *
+ * The Velocity API is licensed under the terms of the MIT License. For more details,
+ * reference the LICENSE file in the api top-level directory.
+ */
+
+package com.velocitypowered.api.event.connection;
+
+import com.google.common.base.Preconditions;
+import com.velocitypowered.api.proxy.connection.InboundConnection;
+
+/**
+ * This event is fired when a handshake is established between a client and the proxy.
+ */
+public final class ConnectionHandshakeEventImpl implements ConnectionHandshakeEvent {
+
+  private final InboundConnection connection;
+
+  public ConnectionHandshakeEventImpl(InboundConnection connection) {
+    this.connection = Preconditions.checkNotNull(connection, "connection");
+  }
+
+  public InboundConnection getConnection() {
+    return connection;
+  }
+
+  @Override
+  public String toString() {
+    return "ConnectionHandshakeEvent{"
+        + "connection=" + connection
+        + '}';
+  }
+}

api/src/main/java/com/velocitypowered/api/event/connection/ProxyPingEvent.java

@@ -7,40 +7,17 @@
 
 package com.velocitypowered.api.event.connection;
 
-import com.google.common.base.Preconditions;
 import com.velocitypowered.api.proxy.connection.InboundConnection;
 import com.velocitypowered.api.proxy.server.ServerPing;
 
 /**
  * This event is fired when a server list ping request is sent by a remote client.
  */
-public final class ProxyPingEvent {
+public interface ProxyPingEvent {
 
-  private final InboundConnection connection;
-  private ServerPing ping;
+  InboundConnection getConnection();
 
-  public ProxyPingEvent(InboundConnection connection, ServerPing ping) {
-    this.connection = Preconditions.checkNotNull(connection, "connection");
-    this.ping = Preconditions.checkNotNull(ping, "ping");
-  }
+  ServerPing getPing();
 
-  public InboundConnection getConnection() {
-    return connection;
-  }
-
-  public ServerPing getPing() {
-    return ping;
-  }
-
-  public void setPing(ServerPing ping) {
-    this.ping = Preconditions.checkNotNull(ping, "ping");
-  }
-
-  @Override
-  public String toString() {
-    return "ProxyPingEvent{"
-        + "connection=" + connection
-        + ", ping=" + ping
-        + '}';
-  }
+  void setPing(ServerPing ping);
 }

api/src/main/java/com/velocitypowered/api/event/connection/ProxyPingEventImpl.java

@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2018 Velocity Contributors
+ *
+ * The Velocity API is licensed under the terms of the MIT License. For more details,
+ * reference the LICENSE file in the api top-level directory.
+ */
+
+package com.velocitypowered.api.event.connection;
+
+import com.google.common.base.Preconditions;
+import com.velocitypowered.api.proxy.connection.InboundConnection;
+import com.velocitypowered.api.proxy.server.ServerPing;
+
+/**
+ * This event is fired when a server list ping request is sent by a remote client.
+ */
+public final class ProxyPingEventImpl implements ProxyPingEvent {
+
+  private final InboundConnection connection;
+  private ServerPing ping;
+
+  public ProxyPingEventImpl(InboundConnection connection, ServerPing ping) {
+    this.connection = Preconditions.checkNotNull(connection, "connection");
+    this.ping = Preconditions.checkNotNull(ping, "ping");
+  }
+
+  @Override
+  public InboundConnection getConnection() {
+    return connection;
+  }
+
+  @Override
+  public ServerPing getPing() {
+    return ping;
+  }
+
+  @Override
+  public void setPing(ServerPing ping) {
+    this.ping = Preconditions.checkNotNull(ping, "ping");
+  }
+
+  @Override
+  public String toString() {
+    return "ProxyPingEvent{"
+        + "connection=" + connection
+        + ", ping=" + ping
+        + '}';
+  }
+}

api/src/main/java/com/velocitypowered/api/event/connection/ProxyQueryEvent.java

@@ -7,81 +7,46 @@
 
 package com.velocitypowered.api.event.connection;
 
-import com.google.common.base.Preconditions;
 import com.velocitypowered.api.proxy.server.QueryResponse;
 import java.net.InetAddress;
 
 /**
  * This event is fired if proxy is getting queried over GS4 Query protocol.
  */
-public final class ProxyQueryEvent {
-
-  private final QueryType queryType;
-  private final InetAddress querierAddress;
-  private QueryResponse response;
-
-  /**
-   * Creates a new event.
-   *
-   * @param queryType the type of query
-   * @param querierAddress the remote address for the query
-   * @param response the current query response
-   */
-  public ProxyQueryEvent(QueryType queryType, InetAddress querierAddress, QueryResponse response) {
-    this.queryType = Preconditions.checkNotNull(queryType, "queryType");
-    this.querierAddress = Preconditions.checkNotNull(querierAddress, "querierAddress");
-    this.response = Preconditions.checkNotNull(response, "response");
-  }
+public interface ProxyQueryEvent {
 
   /**
    * Returns the kind of query the remote client is performing.
    *
    * @return query type
    */
-  public QueryType getQueryType() {
-    return queryType;
-  }
+  QueryType getQueryType();
 
   /**
    * Get the address of the client that sent this query.
    *
    * @return querier address
    */
-  public InetAddress getQuerierAddress() {
-    return querierAddress;
-  }
+  InetAddress getQuerierAddress();
 
   /**
    * Returns the current query response.
    *
    * @return the current query response
    */
-  public QueryResponse getResponse() {
-    return response;
-  }
+  QueryResponse getResponse();
 
   /**
    * Sets a new query response.
    *
    * @param response the new non-null query response
    */
-  public void setResponse(QueryResponse response) {
-    this.response = Preconditions.checkNotNull(response, "response");
-  }
-
-  @Override
-  public String toString() {
-    return "ProxyQueryEvent{"
-        + "queryType=" + queryType
-        + ", querierAddress=" + querierAddress
-        + ", response=" + response
-        + '}';
-  }
+  void setResponse(QueryResponse response);
 
   /**
    * Represents the type of query the client is asking for.
    */
-  public enum QueryType {
+  enum QueryType {
     /**
      * Basic query asks only a subset of information, such as hostname, game type (hardcoded to
      * <pre>MINECRAFT</pre>), map, current players, max players, proxy port and proxy hostname.

api/src/main/java/com/velocitypowered/api/event/connection/ProxyQueryEventImpl.java

@@ -0,0 +1,85 @@
+/*
+ * Copyright (C) 2018 Velocity Contributors
+ *
+ * The Velocity API is licensed under the terms of the MIT License. For more details,
+ * reference the LICENSE file in the api top-level directory.
+ */
+
+package com.velocitypowered.api.event.connection;
+
+import com.google.common.base.Preconditions;
+import com.velocitypowered.api.proxy.server.QueryResponse;
+import java.net.InetAddress;
+
+/**
+ * This event is fired if proxy is getting queried over GS4 Query protocol.
+ */
+public final class ProxyQueryEventImpl implements ProxyQueryEvent {
+
+  private final QueryType queryType;
+  private final InetAddress querierAddress;
+  private QueryResponse response;
+
+  /**
+   * Creates a new event.
+   *
+   * @param queryType the type of query
+   * @param querierAddress the remote address for the query
+   * @param response the current query response
+   */
+  public ProxyQueryEventImpl(QueryType queryType, InetAddress querierAddress, QueryResponse response) {
+    this.queryType = Preconditions.checkNotNull(queryType, "queryType");
+    this.querierAddress = Preconditions.checkNotNull(querierAddress, "querierAddress");
+    this.response = Preconditions.checkNotNull(response, "response");
+  }
+
+  /**
+   * Returns the kind of query the remote client is performing.
+   *
+   * @return query type
+   */
+  @Override
+  public QueryType getQueryType() {
+    return queryType;
+  }
+
+  /**
+   * Get the address of the client that sent this query.
+   *
+   * @return querier address
+   */
+  @Override
+  public InetAddress getQuerierAddress() {
+    return querierAddress;
+  }
+
+  /**
+   * Returns the current query response.
+   *
+   * @return the current query response
+   */
+  @Override
+  public QueryResponse getResponse() {
+    return response;
+  }
+
+  /**
+   * Sets a new query response.
+   *
+   * @param response the new non-null query response
+   */
+  @Override
+  public void setResponse(QueryResponse response) {
+    this.response = Preconditions.checkNotNull(response, "response");
+  }
+
+  @Override
+  public String toString() {
+    return "ProxyQueryEvent{"
+        + "queryType=" + queryType
+        + ", querierAddress=" + querierAddress
+        + ", response=" + response
+        + '}';
+  }
+
+}

api/src/main/java/com/velocitypowered/api/event/lifecycle/ProxyInitializeEvent.java

@@ -11,10 +11,6 @@ package com.velocitypowered.api.event.lifecycle;
  * This event is fired by the proxy after plugins have been loaded but before the proxy starts
  * accepting connections.
  */
-public final class ProxyInitializeEvent {
+public interface ProxyInitializeEvent {
 
-  @Override
-  public String toString() {
-    return "ProxyInitializeEvent";
-  }
 }

api/src/main/java/com/velocitypowered/api/event/lifecycle/ProxyInitializeEventImpl.java

@@ -0,0 +1,20 @@
+/*
+ * Copyright (C) 2018 Velocity Contributors
+ *
+ * The Velocity API is licensed under the terms of the MIT License. For more details,
+ * reference the LICENSE file in the api top-level directory.
+ */
+
+package com.velocitypowered.api.event.lifecycle;
+
+/**
+ * This event is fired by the proxy after plugins have been loaded but before the proxy starts
+ * accepting connections.
+ */
+public final class ProxyInitializeEventImpl implements ProxyInitializeEvent {
+
+  @Override
+  public String toString() {
+    return "ProxyInitializeEvent";
+  }
+}

api/src/main/java/com/velocitypowered/api/event/lifecycle/ProxyReloadEvent.java

@@ -10,10 +10,6 @@ package com.velocitypowered.api.event.lifecycle;
 /**
  * This event is fired when the proxy is reloaded by the user using {@code /velocity reload}.
  */
-public class ProxyReloadEvent {
+public interface ProxyReloadEvent {
 
-  @Override
-  public String toString() {
-    return "ProxyReloadEvent";
-  }
 }

api/src/main/java/com/velocitypowered/api/event/lifecycle/ProxyReloadEventImpl.java

@@ -0,0 +1,19 @@
+/*
+ * Copyright (C) 2018 Velocity Contributors
+ *
+ * The Velocity API is licensed under the terms of the MIT License. For more details,
+ * reference the LICENSE file in the api top-level directory.
+ */
+
+package com.velocitypowered.api.event.lifecycle;
+
+/**
+ * This event is fired when the proxy is reloaded by the user using {@code /velocity reload}.
+ */
+public class ProxyReloadEventImpl implements ProxyReloadEvent {
+
+  @Override
+  public String toString() {
+    return "ProxyReloadEvent";
+  }
+}

api/src/main/java/com/velocitypowered/api/event/lifecycle/ProxyShutdownEvent.java

@@ -11,10 +11,6 @@ package com.velocitypowered.api.event.lifecycle;
  * This event is fired by the proxy after the proxy has stopped accepting connections but before the
  * proxy process exits.
  */
-public final class ProxyShutdownEvent {
+public interface ProxyShutdownEvent {
 
-  @Override
-  public String toString() {
-    return "ProxyShutdownEvent";
-  }
 }

api/src/main/java/com/velocitypowered/api/event/lifecycle/ProxyShutdownEventImpl.java

@@ -0,0 +1,16 @@
+/*
+ * Copyright (C) 2018 Velocity Contributors
+ *
+ * The Velocity API is licensed under the terms of the MIT License. For more details,
+ * reference the LICENSE file in the api top-level directory.
+ */
+
+package com.velocitypowered.api.event.lifecycle;
+
+public final class ProxyShutdownEventImpl implements ProxyShutdownEvent {
+
+  @Override
+  public String toString() {
+    return "ProxyShutdownEvent";
+  }
+}

api/src/main/java/com/velocitypowered/api/event/lifecycle/network/ListenerBoundEvent.java

@@ -7,37 +7,15 @@
 
 package com.velocitypowered.api.event.lifecycle.network;
 
-import com.google.common.base.Preconditions;
 import com.velocitypowered.api.network.ListenerType;
-import java.net.InetSocketAddress;
 import java.net.SocketAddress;
 
 /**
  * This event is fired by the proxy after a listener starts accepting connections.
  */
-public final class ListenerBoundEvent {
+public interface ListenerBoundEvent {
 
-  private final SocketAddress address;
-  private final ListenerType listenerType;
+  SocketAddress getAddress();
 
-  public ListenerBoundEvent(SocketAddress address, ListenerType listenerType) {
-    this.address = Preconditions.checkNotNull(address, "address");
-    this.listenerType = Preconditions.checkNotNull(listenerType, "listenerType");
-  }
-
-  public SocketAddress getAddress() {
-    return address;
-  }
-
-  public ListenerType getListenerType() {
-    return listenerType;
-  }
-
-  @Override
-  public String toString() {
-    return "ListenerBoundEvent{"
-        + "address=" + address
-        + ", listenerType=" + listenerType
-        + '}';
-  }
-}
+  ListenerType getListenerType();
+}

api/src/main/java/com/velocitypowered/api/event/lifecycle/network/ListenerBoundEventImpl.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2018 Velocity Contributors
+ *
+ * The Velocity API is licensed under the terms of the MIT License. For more details,
+ * reference the LICENSE file in the api top-level directory.
+ */
+
+package com.velocitypowered.api.event.lifecycle.network;
+
+import com.google.common.base.Preconditions;
+import com.velocitypowered.api.network.ListenerType;
+import java.net.SocketAddress;
+
+/**
+ * This event is fired by the proxy after a listener starts accepting connections.
+ */
+public final class ListenerBoundEventImpl implements ListenerBoundEvent {
+
+  private final SocketAddress address;
+  private final ListenerType listenerType;
+
+  public ListenerBoundEventImpl(SocketAddress address, ListenerType listenerType) {
+    this.address = Preconditions.checkNotNull(address, "address");
+    this.listenerType = Preconditions.checkNotNull(listenerType, "listenerType");
+  }
+
+  @Override
+  public SocketAddress getAddress() {
+    return address;
+  }
+
+  @Override
+  public ListenerType getListenerType() {
+    return listenerType;
+  }
+
+  @Override
+  public String toString() {
+    return "ListenerBoundEvent{"
+        + "address=" + address
+        + ", listenerType=" + listenerType
+        + '}';
+  }
+}

api/src/main/java/com/velocitypowered/api/event/lifecycle/network/ListenerClosedEvent.java

@@ -7,37 +7,15 @@
 
 package com.velocitypowered.api.event.lifecycle.network;
 
-import com.google.common.base.Preconditions;
 import com.velocitypowered.api.network.ListenerType;
-import java.net.InetSocketAddress;
 import java.net.SocketAddress;
 
 /**
  * This event is fired by the proxy before the proxy stops accepting connections.
  */
-public final class ListenerClosedEvent {
+public interface ListenerClosedEvent {
 
-  private final SocketAddress address;
-  private final ListenerType listenerType;
+  SocketAddress getAddress();
 
-  public ListenerClosedEvent(SocketAddress address, ListenerType listenerType) {
-    this.address = Preconditions.checkNotNull(address, "address");
-    this.listenerType = Preconditions.checkNotNull(listenerType, "listenerType");
-  }
-
-  public SocketAddress getAddress() {
-    return address;
-  }
-
-  public ListenerType getListenerType() {
-    return listenerType;
-  }
-
-  @Override
-  public String toString() {
-    return "ListenerCloseEvent{"
-        + "address=" + address
-        + ", listenerType=" + listenerType
-        + '}';
-  }
-}
+  ListenerType getListenerType();
+}

api/src/main/java/com/velocitypowered/api/event/lifecycle/network/ListenerClosedEventImpl.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2018 Velocity Contributors
+ *
+ * The Velocity API is licensed under the terms of the MIT License. For more details,
+ * reference the LICENSE file in the api top-level directory.
+ */
+
+package com.velocitypowered.api.event.lifecycle.network;
+
+import com.google.common.base.Preconditions;
+import com.velocitypowered.api.network.ListenerType;
+import java.net.SocketAddress;
+
+/**
+ * This event is fired by the proxy before the proxy stops accepting connections.
+ */
+public final class ListenerClosedEventImpl implements ListenerClosedEvent {
+
+  private final SocketAddress address;
+  private final ListenerType listenerType;
+
+  public ListenerClosedEventImpl(SocketAddress address, ListenerType listenerType) {
+    this.address = Preconditions.checkNotNull(address, "address");
+    this.listenerType = Preconditions.checkNotNull(listenerType, "listenerType");
+  }
+
+  @Override
+  public SocketAddress getAddress() {
+    return address;
+  }
+
+  @Override
+  public ListenerType getListenerType() {
+    return listenerType;
+  }
+
+  @Override
+  public String toString() {
+    return "ListenerCloseEvent{"
+        + "address=" + address
+        + ", listenerType=" + listenerType
+        + '}';
+  }
+}

api/src/main/java/com/velocitypowered/api/event/permission/PermissionsSetupEvent.java

@@ -7,7 +7,6 @@
 
 package com.velocitypowered.api.event.permission;
 
-import com.google.common.base.Preconditions;
 import com.velocitypowered.api.permission.PermissionFunction;
 import com.velocitypowered.api.permission.PermissionProvider;
 import com.velocitypowered.api.permission.PermissionSubject;
@@ -18,20 +17,9 @@ import org.checkerframework.checker.nullness.qual.Nullable;
  *
  * <p>This event is only called once per subject, on initialisation.</p>
  */
-public final class PermissionsSetupEvent {
+public interface PermissionsSetupEvent {
 
-  private final PermissionSubject subject;
-  private final PermissionProvider defaultProvider;
-  private PermissionProvider provider;
-
-  public PermissionsSetupEvent(PermissionSubject subject, PermissionProvider provider) {
-    this.subject = Preconditions.checkNotNull(subject, "subject");
-    this.provider = this.defaultProvider = Preconditions.checkNotNull(provider, "provider");
-  }
-
-  public PermissionSubject getSubject() {
-    return this.subject;
-  }
+  PermissionSubject getSubject();
 
   /**
    * Uses the provider function to obtain a {@link PermissionFunction} for the subject.
@@ -39,13 +27,9 @@ public final class PermissionsSetupEvent {
    * @param subject the subject
    * @return the obtained permission function
    */
-  public PermissionFunction createFunction(PermissionSubject subject) {
-    return this.provider.createFunction(subject);
-  }
+  PermissionFunction createFunction(PermissionSubject subject);
 
-  public PermissionProvider getProvider() {
-    return this.provider;
-  }
+  PermissionProvider getProvider();
 
   /**
    * Sets the {@link PermissionFunction} that should be used for the subject.
@@ -55,16 +39,5 @@ public final class PermissionsSetupEvent {
    *
    * @param provider the provider
    */
-  public void setProvider(@Nullable PermissionProvider provider) {
-    this.provider = provider == null ? this.defaultProvider : provider;
-  }
-
-  @Override
-  public String toString() {
-    return "PermissionsSetupEvent{"
-        + "subject=" + subject
-        + ", defaultProvider=" + defaultProvider
-        + ", provider=" + provider
-        + '}';
-  }
+  void setProvider(@Nullable PermissionProvider provider);
 }

api/src/main/java/com/velocitypowered/api/event/permission/PermissionsSetupEventImpl.java

@@ -0,0 +1,74 @@
+/*
+ * Copyright (C) 2018 Velocity Contributors
+ *
+ * The Velocity API is licensed under the terms of the MIT License. For more details,
+ * reference the LICENSE file in the api top-level directory.
+ */
+
+package com.velocitypowered.api.event.permission;
+
+import com.google.common.base.Preconditions;
+import com.velocitypowered.api.permission.PermissionFunction;
+import com.velocitypowered.api.permission.PermissionProvider;
+import com.velocitypowered.api.permission.PermissionSubject;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+/**
+ * Called when a {@link PermissionSubject}'s permissions are being setup.
+ *
+ * <p>This event is only called once per subject, on initialisation.</p>
+ */
+public final class PermissionsSetupEventImpl implements PermissionsSetupEvent {
+
+  private final PermissionSubject subject;
+  private final PermissionProvider defaultProvider;
+  private PermissionProvider provider;
+
+  public PermissionsSetupEventImpl(PermissionSubject subject, PermissionProvider provider) {
+    this.subject = Preconditions.checkNotNull(subject, "subject");
+    this.provider = this.defaultProvider = Preconditions.checkNotNull(provider, "provider");
+  }
+
+  @Override
+  public PermissionSubject getSubject() {
+    return this.subject;
+  }
+
+  /**
+   * Uses the provider function to obtain a {@link PermissionFunction} for the subject.
+   *
+   * @param subject the subject
+   * @return the obtained permission function
+   */
+  @Override
+  public PermissionFunction createFunction(PermissionSubject subject) {
+    return this.provider.createFunction(subject);
+  }
+
+  @Override
+  public PermissionProvider getProvider() {
+    return this.provider;
+  }
+
+  /**
+   * Sets the {@link PermissionFunction} that should be used for the subject.
+   *
+   * <p>Specifying <code>null</code> will reset the provider to the default
+   * instance given when the event was posted.</p>
+   *
+   * @param provider the provider
+   */
+  @Override
+  public void setProvider(@Nullable PermissionProvider provider) {
+    this.provider = provider == null ? this.defaultProvider : provider;
+  }
+
+  @Override
+  public String toString() {
+    return "PermissionsSetupEvent{"
+        + "subject=" + subject
+        + ", defaultProvider=" + defaultProvider
+        + ", provider=" + provider
+        + '}';
+  }
+}

api/src/main/java/com/velocitypowered/api/event/player/DisconnectEvent.java

@@ -7,38 +7,13 @@
 
 package com.velocitypowered.api.event.player;
 
-import com.google.common.base.Preconditions;
 import com.velocitypowered.api.proxy.connection.Player;
 
-/**
- * This event is fired when a player disconnects from the proxy. Operations on the provided player,
- * aside from basic data retrieval operations, may behave in undefined ways.
- */
-public final class DisconnectEvent {
+public interface DisconnectEvent {
 
-  private final Player player;
-  private final LoginStatus loginStatus;
+  Player getPlayer();
 
-  public DisconnectEvent(Player player, LoginStatus loginStatus) {
-    this.player = Preconditions.checkNotNull(player, "player");
-    this.loginStatus = Preconditions.checkNotNull(loginStatus, "loginStatus");
-  }
-
-  public Player getPlayer() {
-    return player;
-  }
-
-  public LoginStatus getLoginStatus() {
-    return loginStatus;
-  }
-
-  @Override
-  public String toString() {
-    return "DisconnectEvent{"
-        + "player=" + player + ", "
-        + "loginStatus=" + loginStatus
-        + '}';
-  }
+  LoginStatus getLoginStatus();
 
   public enum LoginStatus {
 

api/src/main/java/com/velocitypowered/api/event/player/DisconnectEventImpl.java

@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2018 Velocity Contributors
+ *
+ * The Velocity API is licensed under the terms of the MIT License. For more details,
+ * reference the LICENSE file in the api top-level directory.
+ */
+
+package com.velocitypowered.api.event.player;
+
+import com.google.common.base.Preconditions;
+import com.velocitypowered.api.proxy.connection.Player;
+
+/**
+ * This event is fired when a player disconnects from the proxy. Operations on the provided player,
+ * aside from basic data retrieval operations, may behave in undefined ways.
+ */
+public final class DisconnectEventImpl implements DisconnectEvent {
+
+  private final Player player;
+  private final LoginStatus loginStatus;
+
+  public DisconnectEventImpl(Player player, LoginStatus loginStatus) {
+    this.player = Preconditions.checkNotNull(player, "player");
+    this.loginStatus = Preconditions.checkNotNull(loginStatus, "loginStatus");
+  }
+
+  @Override
+  public Player getPlayer() {
+    return player;
+  }
+
+  @Override
+  public LoginStatus getLoginStatus() {
+    return loginStatus;
+  }
+
+  @Override
+  public String toString() {
+    return "DisconnectEvent{"
+        + "player=" + player + ", "
+        + "loginStatus=" + loginStatus
+        + '}';
+  }
+
+}

api/src/main/java/com/velocitypowered/api/event/player/GameProfileRequestEvent.java

@@ -13,7 +13,7 @@ import com.velocitypowered.api.util.GameProfile;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
 /**
- * This event is fired after the {@link PreLoginEvent} in
+ * This event is fired after the {@link PreLoginEventImpl} in
  * order to set up the game profile for the user. This can be used to configure a custom profile for
  * a user, i.e. skin replacement.
  */

api/src/main/java/com/velocitypowered/api/event/player/KickedFromServerEvent.java

@@ -13,7 +13,6 @@ import com.velocitypowered.api.proxy.connection.Player;
 import com.velocitypowered.api.proxy.server.RegisteredServer;
 import java.util.Optional;
 import net.kyori.adventure.text.Component;
-import org.checkerframework.checker.nullness.qual.NonNull;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
 /**
@@ -22,79 +21,38 @@ import org.checkerframework.checker.nullness.qual.Nullable;
  * Velocity will notify the user (if they are already connected to a server) or disconnect them
  * (if they are not on a server and no other servers are available).
  */
-public final class KickedFromServerEvent implements
+public interface KickedFromServerEvent extends
     ResultedEvent<KickedFromServerEvent.ServerKickResult> {
 
-  private final Player player;
-  private final RegisteredServer server;
-  private final @Nullable Component originalReason;
-  private final boolean duringServerConnect;
-  private ServerKickResult result;
+  Player getPlayer();
 
-  /**
-   * Creates a {@code KickedFromServerEvent} instance.
-   * @param player the player affected
-   * @param server the server the player disconnected from
-   * @param originalReason the reason for being kicked, optional
-   * @param duringServerConnect whether or not the player was kicked during the connection process
-   * @param result the initial result
-   */
-  public KickedFromServerEvent(Player player, RegisteredServer server,
-      net.kyori.adventure.text.@Nullable Component originalReason,
-      boolean duringServerConnect, ServerKickResult result) {
-    this.player = Preconditions.checkNotNull(player, "player");
-    this.server = Preconditions.checkNotNull(server, "server");
-    this.originalReason = originalReason;
-    this.duringServerConnect = duringServerConnect;
-    this.result = Preconditions.checkNotNull(result, "result");
-  }
-
-  @Override
-  public ServerKickResult getResult() {
-    return result;
-  }
-
-  @Override
-  public void setResult(@NonNull ServerKickResult result) {
-    this.result = Preconditions.checkNotNull(result, "result");
-  }
-
-  public Player getPlayer() {
-    return player;
-  }
-
-  public RegisteredServer getServer() {
-    return server;
-  }
+  RegisteredServer getServer();
 
   /**
    * Gets the reason the server kicked the player from the server.
+   *
    * @return the server kicked the player from the server
    */
-  public Optional<Component> getServerKickReason() {
-    return Optional.ofNullable(originalReason);
-  }
+  Optional<Component> getServerKickReason();
 
   /**
    * Returns whether or not the player got kicked while connecting to another server.
    *
    * @return whether or not the player got kicked
    */
-  public boolean kickedDuringServerConnect() {
-    return duringServerConnect;
-  }
+  boolean kickedDuringServerConnect();
 
   /**
    * Represents the base interface for {@link KickedFromServerEvent} results.
    */
-  public interface ServerKickResult extends ResultedEvent.Result {
+  public interface ServerKickResult extends Result {
 
   }
 
   /**
    * Tells the proxy to disconnect the player with the specified reason.
    */
-  public static final class DisconnectPlayer implements ServerKickResult {
+  final class DisconnectPlayer implements ServerKickResult {
 
     private final Component component;
 
@@ -126,13 +84,13 @@ public final class KickedFromServerEvent implements
    * Tells the proxy to redirect the player to another server. No messages will be sent from the
    * proxy when this result is used.
    */
-  public static final class RedirectPlayer implements ServerKickResult {
+  final class RedirectPlayer implements ServerKickResult {
 
     private final Component message;
     private final RegisteredServer server;
 
     private RedirectPlayer(RegisteredServer server,
-        net.kyori.adventure.text.@Nullable Component message) {
+        @Nullable Component message) {
       this.server = Preconditions.checkNotNull(server, "server");
       this.message = message;
     }
@@ -171,7 +129,7 @@ public final class KickedFromServerEvent implements
    * result to use if the player was  trying to connect to a different server, otherwise it is
    * treated like a {@link DisconnectPlayer} result.
    */
-  public static final class Notify implements ServerKickResult {
+  final class Notify implements ServerKickResult {
 
     private final Component message;
 

api/src/main/java/com/velocitypowered/api/event/player/KickedFromServerEventImpl.java

@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2018 Velocity Contributors
+ *
+ * The Velocity API is licensed under the terms of the MIT License. For more details,
+ * reference the LICENSE file in the api top-level directory.
+ */
+
+package com.velocitypowered.api.event.player;
+
+import com.google.common.base.Preconditions;
+import com.velocitypowered.api.proxy.connection.Player;
+import com.velocitypowered.api.proxy.server.RegisteredServer;
+import java.util.Optional;
+import net.kyori.adventure.text.Component;
+import org.checkerframework.checker.nullness.qual.NonNull;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+/**
+ * Fired when a player is kicked from a server. You may either allow Velocity to kick the player
+ * (with an optional reason override) or redirect the player to a separate server. By default,
+ * Velocity will notify the user (if they are already connected to a server) or disconnect them
+ * (if they are not on a server and no other servers are available).
+ */
+public final class KickedFromServerEventImpl implements KickedFromServerEvent {
+
+  private final Player player;
+  private final RegisteredServer server;
+  private final @Nullable Component originalReason;
+  private final boolean duringServerConnect;
+  private ServerKickResult result;
+
+  /**
+   * Creates a {@code KickedFromServerEvent} instance.
+   * @param player the player affected
+   * @param server the server the player disconnected from
+   * @param originalReason the reason for being kicked, optional
+   * @param duringServerConnect whether or not the player was kicked during the connection process
+   * @param result the initial result
+   */
+  public KickedFromServerEventImpl(Player player, RegisteredServer server,
+      net.kyori.adventure.text.@Nullable Component originalReason,
+      boolean duringServerConnect, ServerKickResult result) {
+    this.player = Preconditions.checkNotNull(player, "player");
+    this.server = Preconditions.checkNotNull(server, "server");
+    this.originalReason = originalReason;
+    this.duringServerConnect = duringServerConnect;
+    this.result = Preconditions.checkNotNull(result, "result");
+  }
+
+  @Override
+  public ServerKickResult getResult() {
+    return result;
+  }
+
+  @Override
+  public void setResult(@NonNull ServerKickResult result) {
+    this.result = Preconditions.checkNotNull(result, "result");
+  }
+
+  @Override
+  public Player getPlayer() {
+    return player;
+  }
+
+  @Override
+  public RegisteredServer getServer() {
+    return server;
+  }
+
+  /**
+   * Gets the reason the server kicked the player from the server.
+   * @return the server kicked the player from the server
+   */
+  @Override
+  public Optional<Component> getServerKickReason() {
+    return Optional.ofNullable(originalReason);
+  }
+
+  /**
+   * Returns whether or not the player got kicked while connecting to another server.
+   *
+   * @return whether or not the player got kicked
+   */
+  @Override
+  public boolean kickedDuringServerConnect() {
+    return duringServerConnect;
+  }
+
+}

api/src/main/java/com/velocitypowered/api/event/player/LoginEvent.java

@@ -7,7 +7,6 @@
 
 package com.velocitypowered.api.event.player;
 
-import com.google.common.base.Preconditions;
 import com.velocitypowered.api.event.ResultedEvent;
 import com.velocitypowered.api.proxy.connection.Player;
 
@@ -15,35 +14,13 @@ import com.velocitypowered.api.proxy.connection.Player;
  * This event is fired once the player has been authenticated but before they connect to a server on
  * the proxy.
  */
-public final class LoginEvent implements ResultedEvent<ResultedEvent.ComponentResult> {
+public interface LoginEvent extends ResultedEvent<ResultedEvent.ComponentResult> {
 
-  private final Player player;
-  private ComponentResult result;
-
-  public LoginEvent(Player player) {
-    this.player = Preconditions.checkNotNull(player, "player");
-    this.result = ComponentResult.allowed();
-  }
-
-  public Player getPlayer() {
-    return player;
-  }
+  Player getPlayer();
 
   @Override
-  public ComponentResult getResult() {
-    return result;
-  }
+  ComponentResult getResult();
 
   @Override
-  public void setResult(ComponentResult result) {
-    this.result = Preconditions.checkNotNull(result, "result");
-  }
-
-  @Override
-  public String toString() {
-    return "LoginEvent{"
-        + "player=" + player
-        + ", result=" + result
-        + '}';
-  }
+  void setResult(ComponentResult result);
 }

api/src/main/java/com/velocitypowered/api/event/player/LoginEventImpl.java

@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2018 Velocity Contributors
+ *
+ * The Velocity API is licensed under the terms of the MIT License. For more details,
+ * reference the LICENSE file in the api top-level directory.
+ */
+
+package com.velocitypowered.api.event.player;
+
+import com.google.common.base.Preconditions;
+import com.velocitypowered.api.proxy.connection.Player;
+
+/**
+ * This event is fired once the player has been authenticated but before they connect to a server on
+ * the proxy.
+ */
+public final class LoginEventImpl implements LoginEvent {
+
+  private final Player player;
+  private ComponentResult result;
+
+  public LoginEventImpl(Player player) {
+    this.player = Preconditions.checkNotNull(player, "player");
+    this.result = ComponentResult.allowed();
+  }
+
+  @Override
+  public Player getPlayer() {
+    return player;
+  }
+
+  @Override
+  public ComponentResult getResult() {
+    return result;
+  }
+
+  @Override
+  public void setResult(ComponentResult result) {
+    this.result = Preconditions.checkNotNull(result, "result");
+  }
+
+  @Override
+  public String toString() {
+    return "LoginEvent{"
+        + "player=" + player
+        + ", result=" + result
+        + '}';
+  }
+}

api/src/main/java/com/velocitypowered/api/event/player/PlayerChannelRegisterEvent.java

@@ -7,7 +7,6 @@
 
 package com.velocitypowered.api.event.player;
 
-import com.google.common.base.Preconditions;
 import com.velocitypowered.api.proxy.connection.Player;
 import com.velocitypowered.api.proxy.messages.ChannelIdentifier;
 import java.util.List;
@@ -16,29 +15,9 @@ import java.util.List;
  * This event is fired when a client ({@link Player}) sends a plugin message through the
  * register channel.
  */
-public final class PlayerChannelRegisterEvent {
+public interface PlayerChannelRegisterEvent {
 
-  private final Player player;
-  private final List<ChannelIdentifier> channels;
+  Player getPlayer();
 
-  public PlayerChannelRegisterEvent(Player player, List<ChannelIdentifier> channels) {
-    this.player = Preconditions.checkNotNull(player, "player");
-    this.channels = Preconditions.checkNotNull(channels, "channels");
-  }
-
-  public Player getPlayer() {
-    return player;
-  }
-
-  public List<ChannelIdentifier> getChannels() {
-    return channels;
-  }
-
-  @Override
-  public String toString() {
-    return "PlayerChannelRegisterEvent{"
-            + "player=" + player
-            + ", channels=" + channels
-            + '}';
-  }
+  List<ChannelIdentifier> getChannels();
 }

api/src/main/java/com/velocitypowered/api/event/player/PlayerChannelRegisterEventImpl.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2018 Velocity Contributors
+ *
+ * The Velocity API is licensed under the terms of the MIT License. For more details,
+ * reference the LICENSE file in the api top-level directory.
+ */
+
+package com.velocitypowered.api.event.player;
+
+import com.google.common.base.Preconditions;
+import com.velocitypowered.api.proxy.connection.Player;
+import com.velocitypowered.api.proxy.messages.ChannelIdentifier;
+import java.util.List;
+
+/**
+ * This event is fired when a client ({@link Player}) sends a plugin message through the
+ * register channel.
+ */
+public final class PlayerChannelRegisterEventImpl implements PlayerChannelRegisterEvent {
+
+  private final Player player;
+  private final List<ChannelIdentifier> channels;
+
+  public PlayerChannelRegisterEventImpl(Player player, List<ChannelIdentifier> channels) {
+    this.player = Preconditions.checkNotNull(player, "player");
+    this.channels = Preconditions.checkNotNull(channels, "channels");
+  }
+
+  @Override
+  public Player getPlayer() {
+    return player;
+  }
+
+  @Override
+  public List<ChannelIdentifier> getChannels() {
+    return channels;
+  }
+
+  @Override
+  public String toString() {
+    return "PlayerChannelRegisterEvent{"
+            + "player=" + player
+            + ", channels=" + channels
+            + '}';
+  }
+}

api/src/main/java/com/velocitypowered/api/event/player/PlayerChatEvent.java

@@ -14,57 +14,22 @@ import java.util.Optional;
 import org.checkerframework.checker.nullness.qual.NonNull;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
-/**
- * This event is fired when a player types in a chat message.
- */
-public final class PlayerChatEvent implements ResultedEvent<PlayerChatEvent.ChatResult> {
+public interface PlayerChatEvent extends ResultedEvent<PlayerChatEvent.ChatResult> {
 
-  private final Player player;
-  private final String message;
-  private ChatResult result;
+  Player getPlayer();
 
-  /**
-   * Constructs a PlayerChatEvent.
-   * @param player the player sending the message
-   * @param message the message being sent
-   */
-  public PlayerChatEvent(Player player, String message) {
-    this.player = Preconditions.checkNotNull(player, "player");
-    this.message = Preconditions.checkNotNull(message, "message");
-    this.result = ChatResult.allowed();
-  }
-
-  public Player getPlayer() {
-    return player;
-  }
-
-  public String getMessage() {
-    return message;
-  }
+  String getMessage();
 
   @Override
-  public ChatResult getResult() {
-    return result;
-  }
+  ChatResult getResult();
 
   @Override
-  public void setResult(ChatResult result) {
-    this.result = Preconditions.checkNotNull(result, "result");
-  }
-
-  @Override
-  public String toString() {
-    return "PlayerChatEvent{"
-        + "player=" + player
-        + ", message=" + message
-        + ", result=" + result
-        + '}';
-  }
+  void setResult(ChatResult result);
 
   /**
    * Represents the result of the {@link PlayerChatEvent}.
    */
-  public static final class ChatResult implements ResultedEvent.Result {
+  final class ChatResult implements Result {
 
     private static final ChatResult ALLOWED = new ChatResult(true, null);
     private static final ChatResult DENIED = new ChatResult(false, null);
@@ -93,6 +58,7 @@ public final class PlayerChatEvent implements ResultedEvent<PlayerChatEvent.Chat
 
     /**
      * Allows the message to be sent, without modification.
+     *
      * @return the allowed result
      */
     public static ChatResult allowed() {
@@ -101,6 +67,7 @@ public final class PlayerChatEvent implements ResultedEvent<PlayerChatEvent.Chat
 
     /**
      * Prevents the message from being sent.
+     *
      * @return the denied result
      */
     public static ChatResult denied() {
@@ -109,6 +76,7 @@ public final class PlayerChatEvent implements ResultedEvent<PlayerChatEvent.Chat
 
     /**
      * Allows the message to be sent, but silently replaced with another.
+     *
      * @param message the message to use instead
      * @return a result with a new message
      */

api/src/main/java/com/velocitypowered/api/event/player/PlayerChatEventImpl.java

@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2018 Velocity Contributors
+ *
+ * The Velocity API is licensed under the terms of the MIT License. For more details,
+ * reference the LICENSE file in the api top-level directory.
+ */
+
+package com.velocitypowered.api.event.player;
+
+import com.google.common.base.Preconditions;
+import com.velocitypowered.api.proxy.connection.Player;
+
+/**
+ * This event is fired when a player types in a chat message.
+ */
+public final class PlayerChatEventImpl implements PlayerChatEvent {
+
+  private final Player player;
+  private final String message;
+  private ChatResult result;
+
+  /**
+   * Constructs a PlayerChatEvent.
+   * @param player the player sending the message
+   * @param message the message being sent
+   */
+  public PlayerChatEventImpl(Player player, String message) {
+    this.player = Preconditions.checkNotNull(player, "player");
+    this.message = Preconditions.checkNotNull(message, "message");
+    this.result = ChatResult.allowed();
+  }
+
+  @Override
+  public Player getPlayer() {
+    return player;
+  }
+
+  @Override
+  public String getMessage() {
+    return message;
+  }
+
+  @Override
+  public ChatResult getResult() {
+    return result;
+  }
+
+  @Override
+  public void setResult(ChatResult result) {
+    this.result = Preconditions.checkNotNull(result, "result");
+  }
+
+  @Override
+  public String toString() {
+    return "PlayerChatEvent{"
+        + "player=" + player
+        + ", message=" + message
+        + ", result=" + result
+        + '}';
+  }
+
+}

api/src/main/java/com/velocitypowered/api/event/player/PlayerChooseInitialServerEvent.java

@@ -7,52 +7,24 @@
 
 package com.velocitypowered.api.event.player;
 
-import com.google.common.base.Preconditions;
 import com.velocitypowered.api.proxy.connection.Player;
 import com.velocitypowered.api.proxy.server.RegisteredServer;
 import java.util.Optional;
-import org.checkerframework.checker.nullness.qual.Nullable;
 
 /**
  * Fired when a player has finished connecting to the proxy and we need to choose the first server
  * to connect to.
  */
-public class PlayerChooseInitialServerEvent {
+public interface PlayerChooseInitialServerEvent {
 
-  private final Player player;
-  private @Nullable RegisteredServer initialServer;
+  Player getPlayer();
 
-  /**
-   * Constructs a PlayerChooseInitialServerEvent.
-   * @param player the player that was connected
-   * @param initialServer the initial server selected, may be {@code null}
-   */
-  public PlayerChooseInitialServerEvent(Player player, @Nullable RegisteredServer initialServer) {
-    this.player = Preconditions.checkNotNull(player, "player");
-    this.initialServer = initialServer;
-  }
-
-  public Player getPlayer() {
-    return player;
-  }
-
-  public Optional<RegisteredServer> getInitialServer() {
-    return Optional.ofNullable(initialServer);
-  }
+  Optional<RegisteredServer> getInitialServer();
 
   /**
    * Sets the new initial server.
+   *
    * @param server the initial server the player should connect to
    */
-  public void setInitialServer(RegisteredServer server) {
-    this.initialServer = server;
-  }
-
-  @Override
-  public String toString() {
-    return "PlayerChooseInitialServerEvent{"
-        + "player=" + player
-        + ", initialServer=" + initialServer
-        + '}';
-  }
+  void setInitialServer(RegisteredServer server);
 }

api/src/main/java/com/velocitypowered/api/event/player/PlayerChooseInitialServerEventImpl.java

@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2018 Velocity Contributors
+ *
+ * The Velocity API is licensed under the terms of the MIT License. For more details,
+ * reference the LICENSE file in the api top-level directory.
+ */
+
+package com.velocitypowered.api.event.player;
+
+import com.google.common.base.Preconditions;
+import com.velocitypowered.api.proxy.connection.Player;
+import com.velocitypowered.api.proxy.server.RegisteredServer;
+import java.util.Optional;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+/**
+ * Fired when a player has finished connecting to the proxy and we need to choose the first server
+ * to connect to.
+ */
+public class PlayerChooseInitialServerEventImpl implements PlayerChooseInitialServerEvent {
+
+  private final Player player;
+  private @Nullable RegisteredServer initialServer;
+
+  /**
+   * Constructs a PlayerChooseInitialServerEvent.
+   * @param player the player that was connected
+   * @param initialServer the initial server selected, may be {@code null}
+   */
+  public PlayerChooseInitialServerEventImpl(Player player, @Nullable RegisteredServer initialServer) {
+    this.player = Preconditions.checkNotNull(player, "player");
+    this.initialServer = initialServer;
+  }
+
+  @Override
+  public Player getPlayer() {
+    return player;
+  }
+
+  @Override
+  public Optional<RegisteredServer> getInitialServer() {
+    return Optional.ofNullable(initialServer);
+  }
+
+  /**
+   * Sets the new initial server.
+   * @param server the initial server the player should connect to
+   */
+  @Override
+  public void setInitialServer(RegisteredServer server) {
+    this.initialServer = server;
+  }
+
+  @Override
+  public String toString() {
+    return "PlayerChooseInitialServerEvent{"
+        + "player=" + player
+        + ", initialServer=" + initialServer
+        + '}';
+  }
+}

api/src/main/java/com/velocitypowered/api/event/player/PlayerModInfoEvent.java

@@ -7,37 +7,16 @@
 
 package com.velocitypowered.api.event.player;
 
-import com.google.common.base.MoreObjects;
-import com.google.common.base.Preconditions;
 import com.velocitypowered.api.proxy.connection.Player;
 import com.velocitypowered.api.util.ModInfo;
 
 /**
- * This event is fired when a Forge client sends its mods to the proxy while connecting to a server.
+ * This event is fired when a modded client sends its mods to the proxy while connecting to a
+ * server.
  */
-public final class PlayerModInfoEvent {
+public interface PlayerModInfoEvent {
 
-  private final Player player;
-  private final ModInfo modInfo;
+  Player getPlayer();
 
-  public PlayerModInfoEvent(Player player, ModInfo modInfo) {
-    this.player = Preconditions.checkNotNull(player, "player");
-    this.modInfo = Preconditions.checkNotNull(modInfo, "modInfo");
-  }
-
-  public Player getPlayer() {
-    return player;
-  }
-
-  public ModInfo getModInfo() {
-    return modInfo;
-  }
-
-  @Override
-  public String toString() {
-    return MoreObjects.toStringHelper(this)
-        .add("player", player)
-        .add("modInfo", modInfo)
-        .toString();
-  }
+  ModInfo getModInfo();
 }

api/src/main/java/com/velocitypowered/api/event/player/PlayerModInfoEventImpl.java

@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2018 Velocity Contributors
+ *
+ * The Velocity API is licensed under the terms of the MIT License. For more details,
+ * reference the LICENSE file in the api top-level directory.
+ */
+
+package com.velocitypowered.api.event.player;
+
+import com.google.common.base.MoreObjects;
+import com.google.common.base.Preconditions;
+import com.velocitypowered.api.proxy.connection.Player;
+import com.velocitypowered.api.util.ModInfo;
+
+public final class PlayerModInfoEventImpl implements PlayerModInfoEvent {
+
+  private final Player player;
+  private final ModInfo modInfo;
+
+  public PlayerModInfoEventImpl(Player player, ModInfo modInfo) {
+    this.player = Preconditions.checkNotNull(player, "player");
+    this.modInfo = Preconditions.checkNotNull(modInfo, "modInfo");
+  }
+
+  @Override
+  public Player getPlayer() {
+    return player;
+  }
+
+  @Override
+  public ModInfo getModInfo() {
+    return modInfo;
+  }
+
+  @Override
+  public String toString() {
+    return MoreObjects.toStringHelper(this)
+        .add("player", player)
+        .add("modInfo", modInfo)
+        .toString();
+  }
+}

api/src/main/java/com/velocitypowered/api/event/player/PlayerResourcePackStatusEvent.java

@@ -7,53 +7,32 @@
 
 package com.velocitypowered.api.event.player;
 
-import com.google.common.base.Preconditions;
 import com.velocitypowered.api.proxy.connection.Player;
 
 /**
  * This event is fired when the status of a resource pack sent to the player by the server is
  * changed.
  */
-public class PlayerResourcePackStatusEvent {
-
-  private final Player player;
-  private final Status status;
-
-  public PlayerResourcePackStatusEvent(Player player, Status status) {
-    this.player = Preconditions.checkNotNull(player, "player");
-    this.status = Preconditions.checkNotNull(status, "status");
-  }
+public interface PlayerResourcePackStatusEvent {
 
   /**
    * Returns the player affected by the change in resource pack status.
    *
    * @return the player
    */
-  public Player getPlayer() {
-    return player;
-  }
+  Player getPlayer();
 
   /**
    * Returns the new status for the resource pack.
    *
    * @return the new status
    */
-  public Status getStatus() {
-    return status;
-  }
-
-  @Override
-  public String toString() {
-    return "PlayerResourcePackStatusEvent{"
-        + "player=" + player
-        + ", status=" + status
-        + '}';
-  }
+  Status getStatus();
 
   /**
    * Represents the possible statuses for the resource pack.
    */
-  public enum Status {
+  enum Status {
     /**
      * The resource pack was applied successfully.
      */

api/src/main/java/com/velocitypowered/api/event/player/PlayerResourcePackStatusEventImpl.java

@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2018 Velocity Contributors
+ *
+ * The Velocity API is licensed under the terms of the MIT License. For more details,
+ * reference the LICENSE file in the api top-level directory.
+ */
+
+package com.velocitypowered.api.event.player;
+
+import com.google.common.base.Preconditions;
+import com.velocitypowered.api.proxy.connection.Player;
+
+/**
+ * This event is fired when the status of a resource pack sent to the player by the server is
+ * changed.
+ */
+public class PlayerResourcePackStatusEventImpl implements PlayerResourcePackStatusEvent {
+
+  private final Player player;
+  private final Status status;
+
+  public PlayerResourcePackStatusEventImpl(Player player, Status status) {
+    this.player = Preconditions.checkNotNull(player, "player");
+    this.status = Preconditions.checkNotNull(status, "status");
+  }
+
+  /**
+   * Returns the player affected by the change in resource pack status.
+   *
+   * @return the player
+   */
+  @Override
+  public Player getPlayer() {
+    return player;
+  }
+
+  /**
+   * Returns the new status for the resource pack.
+   *
+   * @return the new status
+   */
+  @Override
+  public Status getStatus() {
+    return status;
+  }
+
+  @Override
+  public String toString() {
+    return "PlayerResourcePackStatusEvent{"
+        + "player=" + player
+        + ", status=" + status
+        + '}';
+  }
+
+}

api/src/main/java/com/velocitypowered/api/event/player/PlayerSettingsChangedEvent.java

@@ -7,34 +7,12 @@
 
 package com.velocitypowered.api.event.player;
 
-import com.google.common.base.MoreObjects;
-import com.google.common.base.Preconditions;
 import com.velocitypowered.api.proxy.connection.Player;
 import com.velocitypowered.api.proxy.player.PlayerSettings;
 
-public final class PlayerSettingsChangedEvent {
+public interface PlayerSettingsChangedEvent {
 
-  private final Player player;
-  private final PlayerSettings playerSettings;
+  Player getPlayer();
 
-  public PlayerSettingsChangedEvent(Player player, PlayerSettings playerSettings) {
-    this.player = Preconditions.checkNotNull(player, "player");
-    this.playerSettings = Preconditions.checkNotNull(playerSettings, "playerSettings");
-  }
-
-  public Player getPlayer() {
-    return player;
-  }
-
-  public PlayerSettings getPlayerSettings() {
-    return playerSettings;
-  }
-
-  @Override
-  public String toString() {
-    return MoreObjects.toStringHelper(this)
-        .add("player", player)
-        .add("playerSettings", playerSettings)
-        .toString();
-  }
+  PlayerSettings getPlayerSettings();
 }

api/src/main/java/com/velocitypowered/api/event/player/PlayerSettingsChangedEventImpl.java

@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2018 Velocity Contributors
+ *
+ * The Velocity API is licensed under the terms of the MIT License. For more details,
+ * reference the LICENSE file in the api top-level directory.
+ */
+
+package com.velocitypowered.api.event.player;
+
+import com.google.common.base.MoreObjects;
+import com.google.common.base.Preconditions;
+import com.velocitypowered.api.proxy.connection.Player;
+import com.velocitypowered.api.proxy.player.PlayerSettings;
+
+public final class PlayerSettingsChangedEventImpl implements PlayerSettingsChangedEvent {
+
+  private final Player player;
+  private final PlayerSettings playerSettings;
+
+  public PlayerSettingsChangedEventImpl(Player player, PlayerSettings playerSettings) {
+    this.player = Preconditions.checkNotNull(player, "player");
+    this.playerSettings = Preconditions.checkNotNull(playerSettings, "playerSettings");
+  }
+
+  @Override
+  public Player getPlayer() {
+    return player;
+  }
+
+  @Override
+  public PlayerSettings getPlayerSettings() {
+    return playerSettings;
+  }
+
+  @Override
+  public String toString() {
+    return MoreObjects.toStringHelper(this)
+        .add("player", player)
+        .add("playerSettings", playerSettings)
+        .toString();
+  }
+}

api/src/main/java/com/velocitypowered/api/event/player/PostLoginEvent.java

@@ -7,29 +7,13 @@
 
 package com.velocitypowered.api.event.player;
 
-import com.google.common.base.Preconditions;
 import com.velocitypowered.api.proxy.connection.Player;
 
 /**
  * This event is fired once the player has been fully initialized and is about to connect to their
  * first server.
  */
-public final class PostLoginEvent {
+public interface PostLoginEvent {
 
-  private final Player player;
-
-  public PostLoginEvent(Player player) {
-    this.player = Preconditions.checkNotNull(player, "player");
-  }
-
-  public Player getPlayer() {
-    return player;
-  }
-
-  @Override
-  public String toString() {
-    return "PostLoginEvent{"
-        + "player=" + player
-        + '}';
-  }
+  Player getPlayer();
 }

api/src/main/java/com/velocitypowered/api/event/player/PostLoginEventImpl.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2018 Velocity Contributors
+ *
+ * The Velocity API is licensed under the terms of the MIT License. For more details,
+ * reference the LICENSE file in the api top-level directory.
+ */
+
+package com.velocitypowered.api.event.player;
+
+import com.google.common.base.Preconditions;
+import com.velocitypowered.api.proxy.connection.Player;
+
+/**
+ * This event is fired once the player has been fully initialized and is about to connect to their
+ * first server.
+ */
+public final class PostLoginEventImpl implements PostLoginEvent {
+
+  private final Player player;
+
+  public PostLoginEventImpl(Player player) {
+    this.player = Preconditions.checkNotNull(player, "player");
+  }
+
+  @Override
+  public Player getPlayer() {
+    return player;
+  }
+
+  @Override
+  public String toString() {
+    return "PostLoginEvent{"
+        + "player=" + player
+        + '}';
+  }
+}

api/src/main/java/com/velocitypowered/api/event/player/PreLoginEvent.java

@@ -20,55 +20,23 @@ import org.checkerframework.checker.nullness.qual.Nullable;
  * authenticates the player with Mojang or before the player's proxy connection is fully established
  * (for offline mode).
  */
-public final class PreLoginEvent implements ResultedEvent<PreLoginEvent.PreLoginComponentResult> {
+public interface PreLoginEvent extends ResultedEvent<PreLoginEvent.PreLoginComponentResult> {
 
-  private final InboundConnection connection;
-  private final String username;
-  private PreLoginComponentResult result;
+  InboundConnection getConnection();
 
-  /**
-   * Creates a new instance.
-   * @param connection the connection logging into the proxy
-   * @param username the player's username
-   */
-  public PreLoginEvent(InboundConnection connection, String username) {
-    this.connection = Preconditions.checkNotNull(connection, "connection");
-    this.username = Preconditions.checkNotNull(username, "username");
-    this.result = PreLoginComponentResult.allowed();
-  }
-
-  public InboundConnection getConnection() {
-    return connection;
-  }
-
-  public String getUsername() {
-    return username;
-  }
+  String getUsername();
 
   @Override
-  public PreLoginComponentResult getResult() {
-    return result;
-  }
+  PreLoginComponentResult getResult();
 
   @Override
-  public void setResult(@NonNull PreLoginComponentResult result) {
-    this.result = Preconditions.checkNotNull(result, "result");
-  }
-
-  @Override
-  public String toString() {
-    return "PreLoginEvent{"
-        + "connection=" + connection
-        + ", username='" + username + '\''
-        + ", result=" + result
-        + '}';
-  }
+  void setResult(@NonNull PreLoginComponentResult result);
 
   /**
    * Represents an "allowed/allowed with forced online\offline mode/denied" result with a reason
    * allowed for denial.
    */
-  public static final class PreLoginComponentResult implements ResultedEvent.Result {
+  final class PreLoginComponentResult implements Result {
 
     private static final PreLoginComponentResult ALLOWED = new PreLoginComponentResult(
         Result.ALLOWED, null);

api/src/main/java/com/velocitypowered/api/event/player/PreLoginEventImpl.java

@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2018 Velocity Contributors
+ *
+ * The Velocity API is licensed under the terms of the MIT License. For more details,
+ * reference the LICENSE file in the api top-level directory.
+ */
+
+package com.velocitypowered.api.event.player;
+
+import com.google.common.base.Preconditions;
+import com.velocitypowered.api.proxy.connection.InboundConnection;
+import org.checkerframework.checker.nullness.qual.NonNull;
+
+/**
+ * This event is fired when a player has initiated a connection with the proxy but before the proxy
+ * authenticates the player with Mojang or before the player's proxy connection is fully established
+ * (for offline mode).
+ */
+public final class PreLoginEventImpl implements PreLoginEvent {
+
+  private final InboundConnection connection;
+  private final String username;
+  private PreLoginComponentResult result;
+
+  /**
+   * Creates a new instance.
+   * @param connection the connection logging into the proxy
+   * @param username the player's username
+   */
+  public PreLoginEventImpl(InboundConnection connection, String username) {
+    this.connection = Preconditions.checkNotNull(connection, "connection");
+    this.username = Preconditions.checkNotNull(username, "username");
+    this.result = PreLoginComponentResult.allowed();
+  }
+
+  @Override
+  public InboundConnection getConnection() {
+    return connection;
+  }
+
+  @Override
+  public String getUsername() {
+    return username;
+  }
+
+  @Override
+  public PreLoginComponentResult getResult() {
+    return result;
+  }
+
+  @Override
+  public void setResult(@NonNull PreLoginComponentResult result) {
+    this.result = Preconditions.checkNotNull(result, "result");
+  }
+
+  @Override
+  public String toString() {
+    return "PreLoginEvent{"
+        + "connection=" + connection
+        + ", username='" + username + '\''
+        + ", result=" + result
+        + '}';
+  }
+
+}

api/src/main/java/com/velocitypowered/api/event/player/ServerConnectedEvent.java

@@ -7,53 +7,19 @@
 
 package com.velocitypowered.api.event.player;
 
-import com.google.common.base.Preconditions;
 import com.velocitypowered.api.proxy.connection.Player;
 import com.velocitypowered.api.proxy.server.RegisteredServer;
 import java.util.Optional;
-import org.checkerframework.checker.nullness.qual.Nullable;
 
 /**
  * This event is fired once the player has successfully connected to the target server and the
  * connection to the previous server has been de-established.
  */
-public final class ServerConnectedEvent {
+public interface ServerConnectedEvent {
 
-  private final Player player;
-  private final RegisteredServer server;
-  private final @Nullable RegisteredServer previousServer;
+  Player getPlayer();
 
-  /**
-   * Constructs a ServerConnectedEvent.
-   * @param player the player that was connected
-   * @param server the server the player was connected to
-   * @param previousServer the server the player was previously connected to, null if none
-   */
-  public ServerConnectedEvent(Player player, RegisteredServer server,
-      @Nullable RegisteredServer previousServer) {
-    this.player = Preconditions.checkNotNull(player, "player");
-    this.server = Preconditions.checkNotNull(server, "server");
-    this.previousServer = previousServer;
-  }
+  RegisteredServer getServer();
 
-  public Player getPlayer() {
-    return player;
-  }
-
-  public RegisteredServer getServer() {
-    return server;
-  }
-
-  public Optional<RegisteredServer> getPreviousServer() {
-    return Optional.ofNullable(previousServer);
-  }
-
-  @Override
-  public String toString() {
-    return "ServerConnectedEvent{"
-        + "player=" + player
-        + ", server=" + server
-        + ", previousServer=" + previousServer
-        + '}';
-  }
+  Optional<RegisteredServer> getPreviousServer();
 }

api/src/main/java/com/velocitypowered/api/event/player/ServerConnectedEventImpl.java

@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2018 Velocity Contributors
+ *
+ * The Velocity API is licensed under the terms of the MIT License. For more details,
+ * reference the LICENSE file in the api top-level directory.
+ */
+
+package com.velocitypowered.api.event.player;
+
+import com.google.common.base.Preconditions;
+import com.velocitypowered.api.proxy.connection.Player;
+import com.velocitypowered.api.proxy.server.RegisteredServer;
+import java.util.Optional;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+/**
+ * This event is fired once the player has successfully connected to the target server and the
+ * connection to the previous server has been de-established.
+ */
+public final class ServerConnectedEventImpl implements ServerConnectedEvent {
+
+  private final Player player;
+  private final RegisteredServer server;
+  private final @Nullable RegisteredServer previousServer;
+
+  /**
+   * Constructs a ServerConnectedEvent.
+   * @param player the player that was connected
+   * @param server the server the player was connected to
+   * @param previousServer the server the player was previously connected to, null if none
+   */
+  public ServerConnectedEventImpl(Player player, RegisteredServer server,
+      @Nullable RegisteredServer previousServer) {
+    this.player = Preconditions.checkNotNull(player, "player");
+    this.server = Preconditions.checkNotNull(server, "server");
+    this.previousServer = previousServer;
+  }
+
+  @Override
+  public Player getPlayer() {
+    return player;
+  }
+
+  @Override
+  public RegisteredServer getServer() {
+    return server;
+  }
+
+  @Override
+  public Optional<RegisteredServer> getPreviousServer() {
+    return Optional.ofNullable(previousServer);
+  }
+
+  @Override
+  public String toString() {
+    return "ServerConnectedEvent{"
+        + "player=" + player
+        + ", server=" + server
+        + ", previousServer=" + previousServer
+        + '}';
+  }
+}

api/src/main/java/com/velocitypowered/api/event/player/ServerPostConnectEvent.java

@@ -7,8 +7,6 @@
 
 package com.velocitypowered.api.event.player;
 
-import com.google.common.annotations.Beta;
-import com.google.common.base.Preconditions;
 import com.velocitypowered.api.proxy.connection.Player;
 import com.velocitypowered.api.proxy.server.RegisteredServer;
 import org.checkerframework.checker.nullness.qual.Nullable;
@@ -17,30 +15,9 @@ import org.checkerframework.checker.nullness.qual.Nullable;
  * Fired after the player has connected to a server. The server the player is now connected to is
  * available in {@link Player#getCurrentServer()}.
  */
-@Beta
-public class ServerPostConnectEvent {
-  private final Player player;
-  private final RegisteredServer previousServer;
+public interface ServerPostConnectEvent {
 
-  public ServerPostConnectEvent(Player player,
-      @Nullable RegisteredServer previousServer) {
-    this.player = Preconditions.checkNotNull(player, "player");
-    this.previousServer = previousServer;
-  }
+  Player getPlayer();
 
-  public Player getPlayer() {
-    return player;
-  }
-
-  public @Nullable RegisteredServer getPreviousServer() {
-    return previousServer;
-  }
-
-  @Override
-  public String toString() {
-    return "ServerPostConnectEvent{"
-        + "player=" + player
-        + ", previousServer=" + previousServer
-        + '}';
-  }
+  @Nullable RegisteredServer getPreviousServer();
 }

api/src/main/java/com/velocitypowered/api/event/player/ServerPostConnectEventImpl.java

@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2018 Velocity Contributors
+ *
+ * The Velocity API is licensed under the terms of the MIT License. For more details,
+ * reference the LICENSE file in the api top-level directory.
+ */
+
+package com.velocitypowered.api.event.player;
+
+import com.google.common.base.Preconditions;
+import com.velocitypowered.api.proxy.connection.Player;
+import com.velocitypowered.api.proxy.server.RegisteredServer;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+/**
+ * Fired after the player has connected to a server. The server the player is now connected to is
+ * available in {@link Player#getCurrentServer()}.
+ */
+public class ServerPostConnectEventImpl implements ServerPostConnectEvent {
+
+  private final Player player;
+  private final RegisteredServer previousServer;
+
+  public ServerPostConnectEventImpl(Player player,
+      @Nullable RegisteredServer previousServer) {
+    this.player = Preconditions.checkNotNull(player, "player");
+    this.previousServer = previousServer;
+  }
+
+  @Override
+  public Player getPlayer() {
+    return player;
+  }
+
+  @Override
+  public @Nullable RegisteredServer getPreviousServer() {
+    return previousServer;
+  }
+
+  @Override
+  public String toString() {
+    return "ServerPostConnectEvent{"
+        + "player=" + player
+        + ", previousServer=" + previousServer
+        + '}';
+  }
+}

api/src/main/java/com/velocitypowered/api/event/player/ServerPreConnectEvent.java

@@ -19,65 +19,34 @@ import org.checkerframework.checker.nullness.qual.Nullable;
 /**
  * This event is fired before the player connects to a server.
  */
-public final class ServerPreConnectEvent implements
-    ResultedEvent<ServerPreConnectEvent.ServerResult> {
-
-  private final Player player;
-  private final RegisteredServer originalServer;
-  private ServerResult result;
-
-  /**
-   * Creates the ServerPreConnectEvent.
-   * @param player the player who is connecting to a server
-   * @param originalServer the server the player was trying to connect to
-   */
-  public ServerPreConnectEvent(Player player, RegisteredServer originalServer) {
-    this.player = Preconditions.checkNotNull(player, "player");
-    this.originalServer = Preconditions.checkNotNull(originalServer, "originalServer");
-    this.result = ServerResult.allowed(originalServer);
-  }
+public interface ServerPreConnectEvent extends ResultedEvent<ServerPreConnectEvent.ServerResult> {
 
   /**
    * Returns the player connecting to the server.
+   *
    * @return the player connecting to the server
    */
-  public Player getPlayer() {
-    return player;
-  }
+  Player getPlayer();
 
   @Override
-  public ServerResult getResult() {
-    return result;
-  }
+  ServerResult getResult();
 
   @Override
-  public void setResult(ServerResult result) {
-    this.result = Preconditions.checkNotNull(result, "result");
-  }
+  void setResult(ServerResult result);
 
   /**
-   * Returns the server that the player originally tried to connect to. To get the server the
-   * player will connect to, see the {@link ServerResult} of this event. To get the server the
-   * player is currently on when this event is fired, use {@link Player#getCurrentServer()}.
+   * Returns the server that the player originally tried to connect to. To get the server the player
+   * will connect to, see the {@link ServerResult} of this event. To get the server the player is
+   * currently on when this event is fired, use {@link Player#getCurrentServer()}.
+   *
    * @return the server that the player originally tried to connect to
    */
-  public RegisteredServer getOriginalServer() {
-    return originalServer;
-  }
-
-  @Override
-  public String toString() {
-    return "ServerPreConnectEvent{"
-        + "player=" + player
-        + ", originalServer=" + originalServer
-        + ", result=" + result
-        + '}';
-  }
+  RegisteredServer getOriginalServer();
 
   /**
    * Represents the result of the {@link ServerPreConnectEvent}.
    */
-  public static class ServerResult implements ResultedEvent.Result {
+  class ServerResult implements Result {
 
     private static final ServerResult DENIED = new ServerResult(null);
 
@@ -106,8 +75,9 @@ public final class ServerPreConnectEvent implements
 
     /**
      * Returns a result that will prevent players from connecting to another server. If this result
-     * is used, then {@link ConnectionRequestBuilder#connect()}'s result will have the status
-     * {@link Status#CONNECTION_CANCELLED}.
+     * is used, then {@link ConnectionRequestBuilder#connect()}'s result will have the status {@link
+     * Status#CONNECTION_CANCELLED}.
+     *
      * @return a result to deny conneections
      */
     public static ServerResult denied() {
@@ -116,6 +86,7 @@ public final class ServerPreConnectEvent implements
 
     /**
      * Allows the player to connect to the specified server.
+     *
      * @param server the new server to connect to
      * @return a result to allow the player to connect to the specified server
      */

api/src/main/java/com/velocitypowered/api/event/player/ServerPreConnectEventImpl.java

@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2018 Velocity Contributors
+ *
+ * The Velocity API is licensed under the terms of the MIT License. For more details,
+ * reference the LICENSE file in the api top-level directory.
+ */
+
+package com.velocitypowered.api.event.player;
+
+import com.google.common.base.Preconditions;
+import com.velocitypowered.api.proxy.connection.Player;
+import com.velocitypowered.api.proxy.server.RegisteredServer;
+
+/**
+ * This event is fired before the player connects to a server.
+ */
+public final class ServerPreConnectEventImpl implements ServerPreConnectEvent {
+
+  private final Player player;
+  private final RegisteredServer originalServer;
+  private ServerResult result;
+
+  /**
+   * Creates the ServerPreConnectEvent.
+   * @param player the player who is connecting to a server
+   * @param originalServer the server the player was trying to connect to
+   */
+  public ServerPreConnectEventImpl(Player player, RegisteredServer originalServer) {
+    this.player = Preconditions.checkNotNull(player, "player");
+    this.originalServer = Preconditions.checkNotNull(originalServer, "originalServer");
+    this.result = ServerResult.allowed(originalServer);
+  }
+
+  /**
+   * Returns the player connecting to the server.
+   * @return the player connecting to the server
+   */
+  @Override
+  public Player getPlayer() {
+    return player;
+  }
+
+  @Override
+  public ServerResult getResult() {
+    return result;
+  }
+
+  @Override
+  public void setResult(ServerResult result) {
+    this.result = Preconditions.checkNotNull(result, "result");
+  }
+
+  /**
+   * Returns the server that the player originally tried to connect to. To get the server the
+   * player will connect to, see the {@link ServerResult} of this event. To get the server the
+   * player is currently on when this event is fired, use {@link Player#getCurrentServer()}.
+   * @return the server that the player originally tried to connect to
+   */
+  @Override
+  public RegisteredServer getOriginalServer() {
+    return originalServer;
+  }
+
+  @Override
+  public String toString() {
+    return "ServerPreConnectEvent{"
+        + "player=" + player
+        + ", originalServer=" + originalServer
+        + ", result=" + result
+        + '}';
+  }
+
+}

api/src/main/java/com/velocitypowered/api/event/player/TabCompleteEvent.java

@@ -7,63 +7,33 @@
 
 package com.velocitypowered.api.event.player;
 
-import static com.google.common.base.Preconditions.checkNotNull;
-
 import com.velocitypowered.api.proxy.connection.Player;
-import java.util.ArrayList;
 import java.util.List;
 
 /**
  * This event is fired after a tab complete response is sent by the remote server, for clients on
  * 1.12.2 and below. You have the opportunity to modify the response sent to the remote player.
  */
-public class TabCompleteEvent {
-  private final Player player;
-  private final String partialMessage;
-  private final List<String> suggestions;
-
-  /**
-   * Constructs a new TabCompleteEvent instance.
-   * @param player the player
-   * @param partialMessage the partial message
-   * @param suggestions the initial list of suggestions
-   */
-  public TabCompleteEvent(Player player, String partialMessage, List<String> suggestions) {
-    this.player = checkNotNull(player, "player");
-    this.partialMessage = checkNotNull(partialMessage, "partialMessage");
-    this.suggestions = new ArrayList<>(checkNotNull(suggestions, "suggestions"));
-  }
+public interface TabCompleteEvent {
 
   /**
    * Returns the player requesting the tab completion.
+   *
    * @return the requesting player
    */
-  public Player getPlayer() {
-    return player;
-  }
+  Player getPlayer();
 
   /**
    * Returns the message being partially completed.
+   *
    * @return the partial message
    */
-  public String getPartialMessage() {
-    return partialMessage;
-  }
+  String getPartialMessage();
 
   /**
    * Returns all the suggestions provided to the user, as a mutable list.
+   *
    * @return the suggestions
    */
-  public List<String> getSuggestions() {
-    return suggestions;
-  }
-
-  @Override
-  public String toString() {
-    return "TabCompleteEvent{"
-        + "player=" + player
-        + ", partialMessage='" + partialMessage + '\''
-        + ", suggestions=" + suggestions
-        + '}';
-  }
+  List<String> getSuggestions();
 }

api/src/main/java/com/velocitypowered/api/event/player/TabCompleteEventImpl.java

@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2018 Velocity Contributors
+ *
+ * The Velocity API is licensed under the terms of the MIT License. For more details,
+ * reference the LICENSE file in the api top-level directory.
+ */
+
+package com.velocitypowered.api.event.player;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import com.velocitypowered.api.proxy.connection.Player;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * This event is fired after a tab complete response is sent by the remote server, for clients on
+ * 1.12.2 and below. You have the opportunity to modify the response sent to the remote player.
+ */
+public class TabCompleteEventImpl implements TabCompleteEvent {
+  private final Player player;
+  private final String partialMessage;
+  private final List<String> suggestions;
+
+  /**
+   * Constructs a new TabCompleteEvent instance.
+   * @param player the player
+   * @param partialMessage the partial message
+   * @param suggestions the initial list of suggestions
+   */
+  public TabCompleteEventImpl(Player player, String partialMessage, List<String> suggestions) {
+    this.player = checkNotNull(player, "player");
+    this.partialMessage = checkNotNull(partialMessage, "partialMessage");
+    this.suggestions = new ArrayList<>(checkNotNull(suggestions, "suggestions"));
+  }
+
+  /**
+   * Returns the player requesting the tab completion.
+   * @return the requesting player
+   */
+  @Override
+  public Player getPlayer() {
+    return player;
+  }
+
+  /**
+   * Returns the message being partially completed.
+   * @return the partial message
+   */
+  @Override
+  public String getPartialMessage() {
+    return partialMessage;
+  }
+
+  /**
+   * Returns all the suggestions provided to the user, as a mutable list.
+   * @return the suggestions
+   */
+  @Override
+  public List<String> getSuggestions() {
+    return suggestions;
+  }
+
+  @Override
+  public String toString() {
+    return "TabCompleteEvent{"
+        + "player=" + player
+        + ", partialMessage='" + partialMessage + '\''
+        + ", suggestions=" + suggestions
+        + '}';
+  }
+}

api/src/main/java/com/velocitypowered/api/proxy/connection/Player.java

@@ -8,7 +8,7 @@
 package com.velocitypowered.api.proxy.connection;
 
 import com.velocitypowered.api.command.CommandSource;
-import com.velocitypowered.api.event.player.PlayerResourcePackStatusEvent;
+import com.velocitypowered.api.event.player.PlayerResourcePackStatusEventImpl;
 import com.velocitypowered.api.proxy.messages.ChannelMessageSink;
 import com.velocitypowered.api.proxy.messages.ChannelMessageSource;
 import com.velocitypowered.api.proxy.player.ConnectionRequestBuilder;
@@ -123,7 +123,7 @@ public interface Player extends CommandSource, Identified, InboundConnection,
   /**
    * Sends the specified resource pack from {@code url} to the user. If at all possible, send the
    * resource pack using {@link #sendResourcePack(String, byte[])}. To monitor the status of the
-   * sent resource pack, subscribe to {@link PlayerResourcePackStatusEvent}.
+   * sent resource pack, subscribe to {@link PlayerResourcePackStatusEventImpl}.
    *
    * @param url the URL for the resource pack
    */
@@ -132,7 +132,7 @@ public interface Player extends CommandSource, Identified, InboundConnection,
   /**
    * Sends the specified resource pack from {@code url} to the user, using the specified 20-byte
    * SHA-1 hash. To monitor the status of the sent resource pack, subscribe to
-   * {@link PlayerResourcePackStatusEvent}.
+   * {@link PlayerResourcePackStatusEventImpl}.
    *
    * @param url the URL for the resource pack
    * @param hash the SHA-1 hash value for the resource pack

proxy/src/main/java/com/velocitypowered/proxy/VelocityServer.java

@@ -23,9 +23,9 @@ import com.google.common.collect.ImmutableList;
 import com.google.gson.Gson;
 import com.google.gson.GsonBuilder;
 import com.velocitypowered.api.event.EventManager;
-import com.velocitypowered.api.event.lifecycle.ProxyInitializeEvent;
-import com.velocitypowered.api.event.lifecycle.ProxyReloadEvent;
-import com.velocitypowered.api.event.lifecycle.ProxyShutdownEvent;
+import com.velocitypowered.api.event.lifecycle.ProxyInitializeEventImpl;
+import com.velocitypowered.api.event.lifecycle.ProxyReloadEventImpl;
+import com.velocitypowered.api.event.lifecycle.ProxyShutdownEventImpl;
 import com.velocitypowered.api.network.ProtocolVersion;
 import com.velocitypowered.api.plugin.PluginContainer;
 import com.velocitypowered.api.plugin.PluginManager;
@@ -214,7 +214,7 @@ public class VelocityServer implements ProxyServer, ForwardingAudience {
 
     // Go ahead and fire the proxy initialization event. We block since plugins should have a chance
     // to fully initialize before we accept any connections to the server.
-    eventManager.fire(new ProxyInitializeEvent()).join();
+    eventManager.fire(new ProxyInitializeEventImpl()).join();
 
     // init console permissions after plugins are loaded
     console.setupPermissions();
@@ -390,7 +390,7 @@ public class VelocityServer implements ProxyServer, ForwardingAudience {
 
     ipAttemptLimiter = Ratelimiters.createWithMilliseconds(newConfiguration.getLoginRatelimit());
     this.configuration = newConfiguration;
-    eventManager.fireAndForget(new ProxyReloadEvent());
+    eventManager.fireAndForget(new ProxyReloadEventImpl());
     return true;
   }
 
@@ -441,7 +441,7 @@ public class VelocityServer implements ProxyServer, ForwardingAudience {
         }
 
         try {
-          eventManager.fire(new ProxyShutdownEvent()).get(10, TimeUnit.SECONDS);
+          eventManager.fire(new ProxyShutdownEventImpl()).get(10, TimeUnit.SECONDS);
         } catch (TimeoutException e) {
           timedOut = true;
         } catch (ExecutionException e) {

proxy/src/main/java/com/velocitypowered/proxy/command/VelocityCommandManager.java

@@ -34,6 +34,7 @@ import com.velocitypowered.api.command.RawCommand;
 import com.velocitypowered.api.command.SimpleCommand;
 import com.velocitypowered.api.event.command.CommandExecuteEvent;
 import com.velocitypowered.api.event.command.CommandExecuteEvent.CommandResult;
+import com.velocitypowered.api.event.command.CommandExecuteEventImpl;
 import com.velocitypowered.proxy.event.VelocityEventManager;
 import com.velocitypowered.proxy.util.BrigadierUtils;
 import java.util.Iterator;
@@ -117,7 +118,7 @@ public class VelocityCommandManager implements CommandManager {
   }
 
   /**
-   * Fires a {@link CommandExecuteEvent}.
+   * Fires a {@link CommandExecuteEventImpl}.
    *
    * @param source the source to execute the command for
    * @param cmdLine the command to execute
@@ -127,7 +128,7 @@ public class VelocityCommandManager implements CommandManager {
                                                                  final String cmdLine) {
     Preconditions.checkNotNull(source, "source");
     Preconditions.checkNotNull(cmdLine, "cmdLine");
-    return eventManager.fire(new CommandExecuteEvent(source, cmdLine));
+    return eventManager.fire(new CommandExecuteEventImpl(source, cmdLine));
   }
 
   private boolean executeImmediately0(final CommandSource source, final String cmdLine) {

proxy/src/main/java/com/velocitypowered/proxy/connection/backend/BackendPlaySessionHandler.java

@@ -24,7 +24,7 @@ import com.mojang.brigadier.builder.ArgumentBuilder;
 import com.mojang.brigadier.tree.CommandNode;
 import com.mojang.brigadier.tree.RootCommandNode;
 import com.velocitypowered.api.command.CommandSource;
-import com.velocitypowered.api.event.command.PlayerAvailableCommandsEvent;
+import com.velocitypowered.api.event.command.PlayerAvailableCommandsEventImpl;
 import com.velocitypowered.api.event.connection.PluginMessageEvent;
 import com.velocitypowered.api.network.ProtocolVersion;
 import com.velocitypowered.api.proxy.messages.ChannelIdentifier;
@@ -214,7 +214,7 @@ public class BackendPlaySessionHandler implements MinecraftSessionHandler {
     }
 
     server.getEventManager().fire(
-        new PlayerAvailableCommandsEvent(serverConn.getPlayer(), rootNode))
+        new PlayerAvailableCommandsEventImpl(serverConn.getPlayer(), rootNode))
         .thenAcceptAsync(event -> playerConnection.write(commands), playerConnection.eventLoop())
         .exceptionally((ex) -> {
           logger.error("Exception while handling available commands for {}", playerConnection, ex);

proxy/src/main/java/com/velocitypowered/proxy/connection/backend/TransitionSessionHandler.java

@@ -20,8 +20,8 @@ package com.velocitypowered.proxy.connection.backend;
 import static com.velocitypowered.proxy.connection.backend.BackendConnectionPhases.IN_TRANSITION;
 import static com.velocitypowered.proxy.connection.forge.legacy.LegacyForgeHandshakeBackendPhase.HELLO;
 
-import com.velocitypowered.api.event.player.ServerConnectedEvent;
-import com.velocitypowered.api.event.player.ServerPostConnectEvent;
+import com.velocitypowered.api.event.player.ServerConnectedEventImpl;
+import com.velocitypowered.api.event.player.ServerPostConnectEventImpl;
 import com.velocitypowered.proxy.VelocityServer;
 import com.velocitypowered.proxy.connection.ConnectionTypes;
 import com.velocitypowered.proxy.connection.MinecraftConnection;
@@ -101,7 +101,7 @@ public class TransitionSessionHandler implements MinecraftSessionHandler {
     // The goods are in hand! We got JoinGame. Let's transition completely to the new state.
     smc.setAutoReading(false);
     server.getEventManager()
-        .fire(new ServerConnectedEvent(player, serverConn.getServer(),
+        .fire(new ServerConnectedEventImpl(player, serverConn.getServer(),
             existingConnection != null ? existingConnection.getServer() : null))
         .thenRunAsync(() -> {
           // Make sure we can still transition (player might have disconnected here).
@@ -132,7 +132,7 @@ public class TransitionSessionHandler implements MinecraftSessionHandler {
           serverConn.getPlayer().setConnectedServer(serverConn);
 
           // We're done! :)
-          server.getEventManager().fireAndForget(new ServerPostConnectEvent(player,
+          server.getEventManager().fireAndForget(new ServerPostConnectEventImpl(player,
               existingConnection == null ? null : existingConnection.getServer()));
           resultFuture.complete(ConnectionRequestResults.successful(serverConn.getServer()));
         }, smc.eventLoop())

proxy/src/main/java/com/velocitypowered/proxy/connection/client/ClientPlaySessionHandler.java

@@ -25,10 +25,11 @@ import static com.velocitypowered.proxy.network.PluginMessageUtil.constructChann
 import com.google.common.collect.ImmutableList;
 import com.velocitypowered.api.event.command.CommandExecuteEvent.CommandResult;
 import com.velocitypowered.api.event.connection.PluginMessageEvent;
-import com.velocitypowered.api.event.player.PlayerChannelRegisterEvent;
+import com.velocitypowered.api.event.player.PlayerChannelRegisterEventImpl;
 import com.velocitypowered.api.event.player.PlayerChatEvent;
-import com.velocitypowered.api.event.player.PlayerResourcePackStatusEvent;
-import com.velocitypowered.api.event.player.TabCompleteEvent;
+import com.velocitypowered.api.event.player.PlayerChatEventImpl;
+import com.velocitypowered.api.event.player.PlayerResourcePackStatusEventImpl;
+import com.velocitypowered.api.event.player.TabCompleteEventImpl;
 import com.velocitypowered.api.network.ProtocolVersion;
 import com.velocitypowered.api.proxy.messages.ChannelIdentifier;
 import com.velocitypowered.api.proxy.messages.LegacyChannelIdentifier;
@@ -173,10 +174,10 @@ public class ClientPlaySessionHandler implements MinecraftSessionHandler {
             return null;
           });
     } else {
-      PlayerChatEvent event = new PlayerChatEvent(player, msg);
+      PlayerChatEvent event = new PlayerChatEventImpl(player, msg);
       server.getEventManager().fire(event)
           .thenAcceptAsync(pme -> {
-            PlayerChatEvent.ChatResult chatResult = pme.getResult();
+            PlayerChatEventImpl.ChatResult chatResult = pme.getResult();
             if (chatResult.isAllowed()) {
               Optional<String> eventMsg = pme.getResult().getMessage();
               if (eventMsg.isPresent()) {
@@ -224,7 +225,7 @@ public class ClientPlaySessionHandler implements MinecraftSessionHandler {
             channelIdentifiers.add(new LegacyChannelIdentifier(channel));
           }
         }
-        server.getEventManager().fireAndForget(new PlayerChannelRegisterEvent(player,
+        server.getEventManager().fireAndForget(new PlayerChannelRegisterEventImpl(player,
                 ImmutableList.copyOf(channelIdentifiers)));
         backendConn.write(packet.retain());
       } else if (PluginMessageUtil.isUnregister(packet)) {
@@ -286,7 +287,7 @@ public class ClientPlaySessionHandler implements MinecraftSessionHandler {
 
   @Override
   public boolean handle(ServerboundResourcePackResponsePacket packet) {
-    server.getEventManager().fireAndForget(new PlayerResourcePackStatusEvent(player,
+    server.getEventManager().fireAndForget(new PlayerResourcePackStatusEventImpl(player,
         packet.getStatus()));
     return false;
   }
@@ -576,7 +577,7 @@ public class ClientPlaySessionHandler implements MinecraftSessionHandler {
     for (Offer offer : response.getOffers()) {
       offers.add(offer.getText());
     }
-    server.getEventManager().fire(new TabCompleteEvent(player, request.getCommand(), offers))
+    server.getEventManager().fire(new TabCompleteEventImpl(player, request.getCommand(), offers))
         .thenAcceptAsync(e -> {
           response.getOffers().clear();
           for (String s : e.getSuggestions()) {

proxy/src/main/java/com/velocitypowered/proxy/connection/client/ConnectedPlayer.java

@@ -25,14 +25,17 @@ import com.google.common.base.Preconditions;
 import com.google.gson.JsonObject;
 import com.velocitypowered.api.event.player.DisconnectEvent;
 import com.velocitypowered.api.event.player.DisconnectEvent.LoginStatus;
+import com.velocitypowered.api.event.player.DisconnectEventImpl;
 import com.velocitypowered.api.event.player.KickedFromServerEvent;
 import com.velocitypowered.api.event.player.KickedFromServerEvent.DisconnectPlayer;
 import com.velocitypowered.api.event.player.KickedFromServerEvent.Notify;
 import com.velocitypowered.api.event.player.KickedFromServerEvent.RedirectPlayer;
 import com.velocitypowered.api.event.player.KickedFromServerEvent.ServerKickResult;
-import com.velocitypowered.api.event.player.PlayerModInfoEvent;
-import com.velocitypowered.api.event.player.PlayerSettingsChangedEvent;
+import com.velocitypowered.api.event.player.KickedFromServerEventImpl;
+import com.velocitypowered.api.event.player.PlayerModInfoEventImpl;
+import com.velocitypowered.api.event.player.PlayerSettingsChangedEventImpl;
 import com.velocitypowered.api.event.player.ServerPreConnectEvent;
+import com.velocitypowered.api.event.player.ServerPreConnectEventImpl;
 import com.velocitypowered.api.network.ProtocolVersion;
 import com.velocitypowered.api.permission.PermissionFunction;
 import com.velocitypowered.api.permission.PermissionProvider;
@@ -59,7 +62,6 @@ import com.velocitypowered.proxy.network.StateRegistry;
 import com.velocitypowered.proxy.network.packet.AbstractPluginMessagePacket;
 import com.velocitypowered.proxy.network.packet.clientbound.ClientboundChatPacket;
 import com.velocitypowered.proxy.network.packet.clientbound.ClientboundDisconnectPacket;
-import com.velocitypowered.proxy.network.packet.clientbound.ClientboundHeaderAndFooterPacket;
 import com.velocitypowered.proxy.network.packet.clientbound.ClientboundKeepAlivePacket;
 import com.velocitypowered.proxy.network.packet.clientbound.ClientboundPluginMessagePacket;
 import com.velocitypowered.proxy.network.packet.clientbound.ClientboundResourcePackRequestPacket;
@@ -212,7 +214,7 @@ public class ConnectedPlayer implements MinecraftConnectionAssociation, Player {
   void setPlayerSettings(ServerboundClientSettingsPacket settings) {
     ClientSettingsWrapper cs = new ClientSettingsWrapper(settings);
     this.settings = cs;
-    server.getEventManager().fireAndForget(new PlayerSettingsChangedEvent(this, cs));
+    server.getEventManager().fireAndForget(new PlayerSettingsChangedEventImpl(this, cs));
   }
 
   @Override
@@ -222,7 +224,7 @@ public class ConnectedPlayer implements MinecraftConnectionAssociation, Player {
 
   public void setModInfo(ModInfo modInfo) {
     this.modInfo = modInfo;
-    server.getEventManager().fireAndForget(new PlayerModInfoEvent(this, modInfo));
+    server.getEventManager().fireAndForget(new PlayerModInfoEventImpl(this, modInfo));
   }
 
   @Override
@@ -505,7 +507,7 @@ public class ConnectedPlayer implements MinecraftConnectionAssociation, Player {
       }
       result = Notify.create(friendlyReason);
     }
-    KickedFromServerEvent originalEvent = new KickedFromServerEvent(this, rs, kickReason,
+    KickedFromServerEvent originalEvent = new KickedFromServerEventImpl(this, rs, kickReason,
         !kickedFromCurrent, result);
     handleKickEvent(originalEvent, friendlyReason, kickedFromCurrent);
   }
@@ -669,7 +671,7 @@ public class ConnectedPlayer implements MinecraftConnectionAssociation, Player {
     Optional<Player> connectedPlayer = server.getPlayer(this.getUniqueId());
     server.unregisterConnection(this);
 
-    DisconnectEvent.LoginStatus status;
+    DisconnectEventImpl.LoginStatus status;
     if (connectedPlayer.isPresent()) {
       if (!connectedPlayer.get().getCurrentServer().isPresent()) {
         status = LoginStatus.PRE_SERVER_JOIN;
@@ -682,7 +684,7 @@ public class ConnectedPlayer implements MinecraftConnectionAssociation, Player {
           LoginStatus.CANCELLED_BY_USER;
     }
 
-    DisconnectEvent event = new DisconnectEvent(this, status);
+    DisconnectEvent event = new DisconnectEventImpl(this, status);
     server.getEventManager().fire(event).whenComplete((val, ex) -> {
       if (ex == null) {
         this.teardownFuture.complete(null);
@@ -852,7 +854,7 @@ public class ConnectedPlayer implements MinecraftConnectionAssociation, Player {
               return completedFuture(plainResult(initialCheck.get(), toConnect));
             }
 
-            ServerPreConnectEvent event = new ServerPreConnectEvent(ConnectedPlayer.this,
+            ServerPreConnectEvent event = new ServerPreConnectEventImpl(ConnectedPlayer.this,
                 toConnect);
             return server.getEventManager().fire(event)
                 .thenComposeAsync(newEvent -> {

proxy/src/main/java/com/velocitypowered/proxy/connection/client/HandshakeSessionHandler.java

@@ -19,7 +19,7 @@ package com.velocitypowered.proxy.connection.client;
 
 import com.google.common.annotations.VisibleForTesting;
 import com.google.common.base.Preconditions;
-import com.velocitypowered.api.event.connection.ConnectionHandshakeEvent;
+import com.velocitypowered.api.event.connection.ConnectionHandshakeEventImpl;
 import com.velocitypowered.api.network.ProtocolVersion;
 import com.velocitypowered.api.proxy.connection.InboundConnection;
 import com.velocitypowered.proxy.VelocityServer;
@@ -136,7 +136,7 @@ public class HandshakeSessionHandler implements MinecraftSessionHandler {
       return;
     }
 
-    server.getEventManager().fireAndForget(new ConnectionHandshakeEvent(ic));
+    server.getEventManager().fireAndForget(new ConnectionHandshakeEventImpl(ic));
     connection.setSessionHandler(new LoginSessionHandler(server, connection, ic));
   }
 

proxy/src/main/java/com/velocitypowered/proxy/connection/client/LoginSessionHandler.java

@@ -25,15 +25,17 @@ import static com.velocitypowered.proxy.util.EncryptionUtils.decryptRsa;
 import static com.velocitypowered.proxy.util.EncryptionUtils.generateServerId;
 
 import com.google.common.base.Preconditions;
-import com.velocitypowered.api.event.permission.PermissionsSetupEvent;
-import com.velocitypowered.api.event.player.DisconnectEvent;
+import com.velocitypowered.api.event.permission.PermissionsSetupEventImpl;
 import com.velocitypowered.api.event.player.DisconnectEvent.LoginStatus;
+import com.velocitypowered.api.event.player.DisconnectEventImpl;
 import com.velocitypowered.api.event.player.GameProfileRequestEvent;
-import com.velocitypowered.api.event.player.LoginEvent;
+import com.velocitypowered.api.event.player.LoginEventImpl;
 import com.velocitypowered.api.event.player.PlayerChooseInitialServerEvent;
-import com.velocitypowered.api.event.player.PostLoginEvent;
+import com.velocitypowered.api.event.player.PlayerChooseInitialServerEventImpl;
+import com.velocitypowered.api.event.player.PostLoginEventImpl;
 import com.velocitypowered.api.event.player.PreLoginEvent;
 import com.velocitypowered.api.event.player.PreLoginEvent.PreLoginComponentResult;
+import com.velocitypowered.api.event.player.PreLoginEventImpl;
 import com.velocitypowered.api.permission.PermissionFunction;
 import com.velocitypowered.api.proxy.server.RegisteredServer;
 import com.velocitypowered.api.util.GameProfile;
@@ -176,7 +178,7 @@ public class LoginSessionHandler implements MinecraftSessionHandler {
     if (login == null) {
       throw new IllegalStateException("No ServerLogin packet received yet.");
     }
-    PreLoginEvent event = new PreLoginEvent(inbound, login.getUsername());
+    PreLoginEvent event = new PreLoginEventImpl(inbound, login.getUsername());
     server.getEventManager().fire(event)
         .thenRunAsync(() -> {
           if (mcConnection.isClosed()) {
@@ -245,7 +247,7 @@ public class LoginSessionHandler implements MinecraftSessionHandler {
       logger.info("{} has connected", player);
 
       return server.getEventManager()
-          .fire(new PermissionsSetupEvent(player, ConnectedPlayer.DEFAULT_PERMISSIONS))
+          .fire(new PermissionsSetupEventImpl(player, ConnectedPlayer.DEFAULT_PERMISSIONS))
           .thenAcceptAsync(event -> {
             if (!mcConnection.isClosed()) {
               // wait for permissions to load, then set the players permission function
@@ -285,11 +287,11 @@ public class LoginSessionHandler implements MinecraftSessionHandler {
     mcConnection.setAssociation(player);
     mcConnection.setState(StateRegistry.PLAY);
 
-    server.getEventManager().fire(new LoginEvent(player))
+    server.getEventManager().fire(new LoginEventImpl(player))
         .thenAcceptAsync(event -> {
           if (mcConnection.isClosed()) {
             // The player was disconnected
-            server.getEventManager().fireAndForget(new DisconnectEvent(player,
+            server.getEventManager().fireAndForget(new DisconnectEventImpl(player,
                 LoginStatus.CANCELLED_BY_USER_BEFORE_COMPLETE));
             return;
           }
@@ -305,7 +307,7 @@ public class LoginSessionHandler implements MinecraftSessionHandler {
             }
 
             mcConnection.setSessionHandler(new InitialConnectSessionHandler(player));
-            server.getEventManager().fire(new PostLoginEvent(player))
+            server.getEventManager().fire(new PostLoginEventImpl(player))
                 .thenCompose((ignored) -> connectToInitialServer(player))
                 .exceptionally((ex) -> {
                   logger.error("Exception while connecting {} to initial server", player, ex);
@@ -321,7 +323,7 @@ public class LoginSessionHandler implements MinecraftSessionHandler {
 
   private CompletableFuture<Void> connectToInitialServer(ConnectedPlayer player) {
     Optional<RegisteredServer> initialFromConfig = player.getNextServerToTry();
-    PlayerChooseInitialServerEvent event = new PlayerChooseInitialServerEvent(player,
+    PlayerChooseInitialServerEvent event = new PlayerChooseInitialServerEventImpl(player,
         initialFromConfig.orElse(null));
 
     return server.getEventManager().fire(event)

proxy/src/main/java/com/velocitypowered/proxy/connection/client/StatusSessionHandler.java

@@ -19,7 +19,7 @@ package com.velocitypowered.proxy.connection.client;
 
 import com.google.common.collect.ImmutableList;
 import com.spotify.futures.CompletableFutures;
-import com.velocitypowered.api.event.connection.ProxyPingEvent;
+import com.velocitypowered.api.event.connection.ProxyPingEventImpl;
 import com.velocitypowered.api.network.ProtocolVersion;
 import com.velocitypowered.api.proxy.connection.InboundConnection;
 import com.velocitypowered.api.proxy.server.RegisteredServer;
@@ -182,7 +182,7 @@ public class StatusSessionHandler implements MinecraftSessionHandler {
     }
     this.pingReceived = true;
     getInitialPing()
-        .thenCompose(ping -> server.getEventManager().fire(new ProxyPingEvent(inbound, ping)))
+        .thenCompose(ping -> server.getEventManager().fire(new ProxyPingEventImpl(inbound, ping)))
         .thenAcceptAsync(event -> connection.closeWith(
             LegacyDisconnectPacket.fromServerPing(event.getPing(), packet.getVersion())),
             connection.eventLoop())
@@ -207,7 +207,7 @@ public class StatusSessionHandler implements MinecraftSessionHandler {
     this.pingReceived = true;
 
     getInitialPing()
-        .thenCompose(ping -> server.getEventManager().fire(new ProxyPingEvent(inbound, ping)))
+        .thenCompose(ping -> server.getEventManager().fire(new ProxyPingEventImpl(inbound, ping)))
         .thenAcceptAsync(
             (event) -> {
               StringBuilder json = new StringBuilder();

proxy/src/main/java/com/velocitypowered/proxy/console/VelocityConsole.java

@@ -21,6 +21,7 @@ import static com.velocitypowered.api.permission.PermissionFunction.ALWAYS_TRUE;
 
 import com.velocitypowered.api.command.ConsoleCommandSource;
 import com.velocitypowered.api.event.permission.PermissionsSetupEvent;
+import com.velocitypowered.api.event.permission.PermissionsSetupEventImpl;
 import com.velocitypowered.api.permission.PermissionFunction;
 import com.velocitypowered.api.permission.Tristate;
 import com.velocitypowered.proxy.VelocityServer;
@@ -72,7 +73,7 @@ public final class VelocityConsole extends SimpleTerminalConsole implements Cons
    * Sets up permissions for the console.
    */
   public void setupPermissions() {
-    PermissionsSetupEvent event = new PermissionsSetupEvent(this, s -> ALWAYS_TRUE);
+    PermissionsSetupEvent event = new PermissionsSetupEventImpl(this, s -> ALWAYS_TRUE);
     // we can safely block here, this is before any listeners fire
     this.permissionFunction = this.server.getEventManager().fire(event).join().createFunction(this);
     if (this.permissionFunction == null) {

proxy/src/main/java/com/velocitypowered/proxy/network/ConnectionManager.java

@@ -21,8 +21,8 @@ import static org.asynchttpclient.Dsl.asyncHttpClient;
 import static org.asynchttpclient.Dsl.config;
 
 import com.google.common.base.Preconditions;
-import com.velocitypowered.api.event.lifecycle.network.ListenerBoundEvent;
-import com.velocitypowered.api.event.lifecycle.network.ListenerClosedEvent;
+import com.velocitypowered.api.event.lifecycle.network.ListenerBoundEventImpl;
+import com.velocitypowered.api.event.lifecycle.network.ListenerClosedEventImpl;
 import com.velocitypowered.api.network.ListenerType;
 import com.velocitypowered.natives.util.Natives;
 import com.velocitypowered.proxy.VelocityServer;
@@ -136,7 +136,7 @@ public final class ConnectionManager {
 
             // Fire the proxy bound event after the socket is bound
             server.getEventManager().fireAndForget(
-                new ListenerBoundEvent(address, ListenerType.MINECRAFT));
+                new ListenerBoundEventImpl(address, ListenerType.MINECRAFT));
           } else {
             LOGGER.error("Can't bind to {}", address, future.cause());
           }
@@ -165,7 +165,7 @@ public final class ConnectionManager {
 
             // Fire the proxy bound event after the socket is bound
             server.getEventManager().fireAndForget(
-                new ListenerBoundEvent(address, ListenerType.QUERY));
+                new ListenerBoundEventImpl(address, ListenerType.QUERY));
           } else {
             LOGGER.error("Can't bind to {}", bootstrap.config().localAddress(), future.cause());
           }
@@ -203,7 +203,7 @@ public final class ConnectionManager {
 
     // Fire proxy close event to notify plugins of socket close. We block since plugins
     // should have a chance to be notified before the server stops accepting connections.
-    server.getEventManager().fire(new ListenerClosedEvent(oldBind, endpoint.getType())).join();
+    server.getEventManager().fire(new ListenerClosedEventImpl(oldBind, endpoint.getType())).join();
 
     Channel serverChannel = endpoint.getChannel();
 
@@ -222,7 +222,7 @@ public final class ConnectionManager {
 
       // Fire proxy close event to notify plugins of socket close. We block since plugins
       // should have a chance to be notified before the server stops accepting connections.
-      server.getEventManager().fire(new ListenerClosedEvent(address, endpoint.getType())).join();
+      server.getEventManager().fire(new ListenerClosedEventImpl(address, endpoint.getType())).join();
 
       try {
         LOGGER.info("Closing endpoint {}", address);

proxy/src/main/java/com/velocitypowered/proxy/network/pipeline/GS4QueryHandler.java

@@ -23,7 +23,7 @@ import static com.velocitypowered.api.event.connection.ProxyQueryEvent.QueryType
 import com.google.common.cache.Cache;
 import com.google.common.cache.CacheBuilder;
 import com.google.common.collect.ImmutableSet;
-import com.velocitypowered.api.event.connection.ProxyQueryEvent;
+import com.velocitypowered.api.event.connection.ProxyQueryEventImpl;
 import com.velocitypowered.api.network.ProtocolVersion;
 import com.velocitypowered.api.plugin.PluginContainer;
 import com.velocitypowered.api.plugin.PluginDescription;
@@ -151,7 +151,7 @@ public class GS4QueryHandler extends SimpleChannelInboundHandler<DatagramPacket>
 
         // Call event and write response
         server.getEventManager()
-            .fire(new ProxyQueryEvent(isBasic ? BASIC : FULL, senderAddress, response))
+            .fire(new ProxyQueryEventImpl(isBasic ? BASIC : FULL, senderAddress, response))
             .whenCompleteAsync((event, exc) -> {
               // Packet header
               ByteBuf queryResponse = ctx.alloc().buffer();