Disable watchdog ticking by default, //watchdog to turn on

worldedit-core/src/main/java/com/sk89q/worldedit/EditSession.java

@@ -191,6 +191,7 @@ public class EditSession implements Extent, AutoCloseable {
     private final MultiStageReorder reorderExtent;
     private final MaskingExtent maskingExtent;
     private final BlockChangeLimiter changeLimiter;
+    private final List<WatchdogTickingExtent> watchdogExtents = new ArrayList<>(2);
 
     private final Extent bypassReorderHistory;
     private final Extent bypassHistory;
@@ -225,7 +226,9 @@ public class EditSession implements Extent, AutoCloseable {
             extent = fastModeExtent = new FastModeExtent(world, false);
             if (watchdog != null) {
                 // Reset watchdog before world placement
-                extent = new WatchdogTickingExtent(extent, watchdog);
+                WatchdogTickingExtent watchdogExtent = new WatchdogTickingExtent(extent, watchdog);
+                extent = watchdogExtent;
+                watchdogExtents.add(watchdogExtent);
             }
             extent = survivalExtent = new SurvivalModeExtent(extent, world);
             extent = new BlockQuirkExtent(extent, world);
@@ -242,7 +245,9 @@ public class EditSession implements Extent, AutoCloseable {
             if (watchdog != null) {
                 // reset before buffering extents, since they may buffer all changes
                 // before the world-placement reset can happen, and still cause halts
-                extent = new WatchdogTickingExtent(extent, watchdog);
+                WatchdogTickingExtent watchdogExtent = new WatchdogTickingExtent(extent, watchdog);
+                extent = watchdogExtent;
+                watchdogExtents.add(watchdogExtent);
             }
             this.bypassHistory = new DataValidatorExtent(extent, world);
 
@@ -550,6 +555,24 @@ public class EditSession implements Extent, AutoCloseable {
         }
     }
 
+    /**
+     * Check if this session will tick the watchdog.
+     *
+     * @return {@code true} if any watchdog extent is enabled
+     */
+    public boolean isTickingWatchdog() {
+        return watchdogExtents.stream().anyMatch(WatchdogTickingExtent::isEnabled);
+    }
+
+    /**
+     * Set all watchdog extents to the given mode.
+     */
+    public void setTickingWatchdog(boolean active) {
+        for (WatchdogTickingExtent extent : watchdogExtents) {
+            extent.setEnabled(active);
+        }
+    }
+
     /**
      * Get the number of blocks changed, including repeated block changes.
      *

worldedit-core/src/main/java/com/sk89q/worldedit/LocalSession.java

@@ -102,6 +102,7 @@ public class LocalSession {
     private transient EditSession.ReorderMode reorderMode = EditSession.ReorderMode.MULTI_STAGE;
     private transient List<Countable<BlockState>> lastDistribution;
     private transient World worldOverride;
+    private transient boolean tickingWatchdog = false;
 
     // Saved properties
     private String lastScript;
@@ -294,6 +295,14 @@ public class LocalSession {
         this.worldOverride = worldOverride;
     }
 
+    public boolean isTickingWatchdog() {
+        return tickingWatchdog;
+    }
+
+    public void setTickingWatchdog(boolean tickingWatchdog) {
+        this.tickingWatchdog = tickingWatchdog;
+    }
+
     /**
      * Get the default region selector.
      *
@@ -951,6 +960,7 @@ public class LocalSession {
         if (editSession.getSurvivalExtent() != null) {
             editSession.getSurvivalExtent().setStripNbt(!actor.hasPermission("worldedit.setnbt"));
         }
+        editSession.setTickingWatchdog(tickingWatchdog);
 
         return editSession;
     }

worldedit-core/src/main/java/com/sk89q/worldedit/command/GeneralCommands.java

@@ -26,10 +26,12 @@ import com.sk89q.worldedit.WorldEdit;
 import com.sk89q.worldedit.WorldEditException;
 import com.sk89q.worldedit.command.util.CommandPermissions;
 import com.sk89q.worldedit.command.util.CommandPermissionsConditionGenerator;
+import com.sk89q.worldedit.command.util.HookMode;
 import com.sk89q.worldedit.command.util.WorldEditAsyncCommandBuilder;
 import com.sk89q.worldedit.entity.Player;
 import com.sk89q.worldedit.extension.input.DisallowedUsageException;
 import com.sk89q.worldedit.extension.platform.Actor;
+import com.sk89q.worldedit.extension.platform.Capability;
 import com.sk89q.worldedit.function.mask.Mask;
 import com.sk89q.worldedit.util.formatting.component.PaginationBox;
 import com.sk89q.worldedit.util.formatting.text.Component;
@@ -198,6 +200,29 @@ public class GeneralCommands {
         }
     }
 
+    @Command(
+        name = "/watchdog",
+        desc = "Changes watchdog hook state.",
+        descFooter = "This is dependent on platform implementation. " +
+            "Not all platforms support watchdog hooks, or contain a watchdog."
+    )
+    @CommandPermissions("worldedit.watchdog")
+    public void watchdog(Actor actor, LocalSession session,
+                         @Arg(desc = "The mode to set the watchdog hook to", def = "")
+                             HookMode hookMode) {
+        if (WorldEdit.getInstance().getPlatformManager().queryCapability(Capability.GAME_HOOKS).getWatchdog() == null) {
+            actor.printError("This platform has no watchdog hook.");
+            return;
+        }
+        boolean previousMode = session.isTickingWatchdog();
+        if (hookMode != null && (hookMode == HookMode.ACTIVE) == previousMode) {
+            actor.printError("Watchdog hook already " + (previousMode ? "active" : "inactive") + ".");
+            return;
+        }
+        session.setTickingWatchdog(!previousMode);
+        actor.print("Watchdog hook now " + (previousMode ? "inactive" : "active") + ".");
+    }
+
     @Command(
         name = "gmask",
         aliases = {"/gmask"},

worldedit-core/src/main/java/com/sk89q/worldedit/command/argument/EnumConverter.java

@@ -21,6 +21,7 @@ package com.sk89q.worldedit.command.argument;
 
 import com.google.common.collect.ImmutableSet;
 import com.sk89q.worldedit.EditSession;
+import com.sk89q.worldedit.command.util.HookMode;
 import com.sk89q.worldedit.util.TreeGenerator;
 import org.enginehub.piston.CommandManager;
 import org.enginehub.piston.converter.ArgumentConverter;
@@ -46,6 +47,8 @@ public final class EnumConverter {
             full(EditSession.ReorderMode.class,
                 r -> ImmutableSet.of(r.getDisplayName()),
                 null));
+        commandManager.registerConverter(Key.of(HookMode.class),
+            basic(HookMode.class));
     }
 
     private static <E extends Enum<E>> ArgumentConverter<E> basic(Class<E> enumClass) {

worldedit-core/src/main/java/com/sk89q/worldedit/command/util/HookMode.java

@@ -0,0 +1,24 @@
+/*
+ * WorldEdit, a Minecraft world manipulation toolkit
+ * Copyright (C) sk89q <http://www.sk89q.com>
+ * Copyright (C) WorldEdit team and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.sk89q.worldedit.command.util;
+
+public enum HookMode {
+    ACTIVE, INACTIVE
+}

worldedit-core/src/main/java/com/sk89q/worldedit/extent/world/WatchdogTickingExtent.java

@@ -38,7 +38,12 @@ import javax.annotation.Nullable;
  */
 public class WatchdogTickingExtent extends AbstractDelegateExtent {
 
+    // Number of operations we run per tick to the watchdog
+    private static final int OPS_PER_TICK = 100;
+
     private final Watchdog watchdog;
+    private boolean enabled;
+    private int ops;
 
     /**
      * Create a new instance.
@@ -51,22 +56,40 @@ public class WatchdogTickingExtent extends AbstractDelegateExtent {
         this.watchdog = watchdog;
     }
 
+    public boolean isEnabled() {
+        return enabled;
+    }
+
+    public void setEnabled(boolean enabled) {
+        this.enabled = enabled;
+    }
+
+    private void onOperation() {
+        if (enabled) {
+            ops++;
+            if (ops == OPS_PER_TICK) {
+                watchdog.tick();
+                ops = 0;
+            }
+        }
+    }
+
     @Override
     public <T extends BlockStateHolder<T>> boolean setBlock(BlockVector3 location, T block) throws WorldEditException {
-        watchdog.tick();
+        onOperation();
         return super.setBlock(location, block);
     }
 
     @Nullable
     @Override
     public Entity createEntity(Location location, BaseEntity entity) {
-        watchdog.tick();
+        onOperation();
         return super.createEntity(location, entity);
     }
 
     @Override
     public boolean setBiome(BlockVector2 position, BiomeType biome) {
-        watchdog.tick();
+        onOperation();
         return super.setBiome(position, biome);
     }
 }

worldedit-fabric/src/main/java/com/sk89q/worldedit/fabric/FabricPlatform.java

@@ -34,6 +34,7 @@ import net.minecraft.SharedConstants;
 import net.minecraft.server.MinecraftServer;
 import net.minecraft.server.PlayerManager;
 import net.minecraft.server.dedicated.DedicatedServer;
+import net.minecraft.server.dedicated.MinecraftDedicatedServer;
 import net.minecraft.server.network.ServerPlayerEntity;
 import net.minecraft.server.world.ServerWorld;
 import net.minecraft.util.Identifier;
@@ -64,8 +65,8 @@ class FabricPlatform extends AbstractPlatform implements MultiUserPlatform {
         this.mod = mod;
         this.server = server;
         this.dataFixer = new FabricDataFixer(getDataVersion());
-        this.watchdog = server instanceof DedicatedServer
+        this.watchdog = server instanceof MinecraftDedicatedServer
-            ? new FabricWatchdog((MixinMinecraftServer) (Object) server) : null;
+            ? new FabricWatchdog((MinecraftDedicatedServer) server) : null;
     }
 
     boolean isHookingEvents() {

worldedit-fabric/src/main/java/com/sk89q/worldedit/fabric/FabricWatchdog.java

@@ -1,19 +1,39 @@
+/*
+ * WorldEdit, a Minecraft world manipulation toolkit
+ * Copyright (C) sk89q <http://www.sk89q.com>
+ * Copyright (C) WorldEdit team and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
 package com.sk89q.worldedit.fabric;
 
 import com.sk89q.worldedit.extension.platform.Watchdog;
 import com.sk89q.worldedit.fabric.mixin.MixinMinecraftServer;
+import net.minecraft.server.dedicated.MinecraftDedicatedServer;
 import net.minecraft.util.SystemUtil;
 
 class FabricWatchdog implements Watchdog {
 
-    private final MixinMinecraftServer server;
+    private final MinecraftDedicatedServer server;
 
-    FabricWatchdog(MixinMinecraftServer server) {
+    FabricWatchdog(MinecraftDedicatedServer server) {
         this.server = server;
     }
 
     @Override
     public void tick() {
-        server.timeReference = SystemUtil.getMeasuringTimeMs();
+        ((MixinMinecraftServer) (Object) server).timeReference = SystemUtil.getMeasuringTimeMs();
     }
 }

worldedit-fabric/src/main/java/com/sk89q/worldedit/fabric/mixin/MixinMinecraftServer.java

@@ -1,3 +1,22 @@
+/*
+ * WorldEdit, a Minecraft world manipulation toolkit
+ * Copyright (C) sk89q <http://www.sk89q.com>
+ * Copyright (C) WorldEdit team and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
 package com.sk89q.worldedit.fabric.mixin;
 
 import net.minecraft.server.MinecraftServer;
@@ -11,8 +30,8 @@ import org.spongepowered.asm.mixin.Shadow;
 @Mixin(MinecraftServer.class)
 public abstract class MixinMinecraftServer extends NonBlockingThreadExecutor<ServerTask> implements SnooperListener, CommandOutput, AutoCloseable, Runnable {
 
-    public MixinMinecraftServer(String string_1) {
+    public MixinMinecraftServer(String name) {
-        super(string_1);
+        super(name);
     }
 
     @Shadow