Initial implementation of raw registered server creation.

api/src/main/java/com/velocitypowered/api/proxy/ProxyServer.java

@@ -105,6 +105,14 @@ public interface ProxyServer extends Audience {
    */
   Collection<RegisteredServer> matchServer(String partialName);
 
+  /**
+   * Creates a raw {@link RegisteredServer} without tying it into the internal server map.
+   *
+   * @param server the server to register
+   * @return the {@link RegisteredServer} implementation created by the provided {@link ServerInfo}.
+   */
+  RegisteredServer createRawRegisteredServer(ServerInfo server);
+
   /**
    * Registers a server with this proxy. A server with this name should not already exist.
    *

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

@@ -600,6 +600,11 @@ public class VelocityServer implements ProxyServer, ForwardingAudience {
     return servers.getAllServers();
   }
 
+  @Override
+  public RegisteredServer createRawRegisteredServer(ServerInfo server) {
+    return servers.createRawRegisteredServer(server);
+  }
+
   @Override
   public RegisteredServer registerServer(ServerInfo server) {
     return servers.register(server);

proxy/src/main/java/com/velocitypowered/proxy/server/ServerMap.java

@@ -54,6 +54,17 @@ public class ServerMap {
     return ImmutableList.copyOf(servers.values());
   }
 
+  /**
+   * Creates a raw implementation of a {@link RegisteredServer} without
+   *  tying it to the internal server map.
+   *
+   * @param serverInfo the server to create a registered server with
+   * @return the {@link RegisteredServer} built from the {@link ServerInfo}
+   */
+  public RegisteredServer createRawRegisteredServer(ServerInfo serverInfo) {
+    return new VelocityRegisteredServer(server, serverInfo);
+  }
+
   /**
    * Registers a server with the proxy.
    *
@@ -63,7 +74,7 @@ public class ServerMap {
   public RegisteredServer register(ServerInfo serverInfo) {
     Preconditions.checkNotNull(serverInfo, "serverInfo");
     String lowerName = serverInfo.getName().toLowerCase(Locale.US);
-    VelocityRegisteredServer rs = new VelocityRegisteredServer(server, serverInfo);
+    RegisteredServer rs = createRawRegisteredServer(serverInfo);
 
     RegisteredServer existing = servers.putIfAbsent(lowerName, rs);
     if (existing != null && !existing.getServerInfo().equals(serverInfo)) {