Add abillity to freeze maps (they wont update) and persist stopped render-threads

BlueMapCommon/src/main/java/de/bluecolored/bluemap/common/plugin/Plugin.java

@@ -47,6 +47,8 @@
 import de.bluecolored.bluemap.core.webserver.HttpRequestHandler;
 import de.bluecolored.bluemap.core.webserver.WebServer;
 import de.bluecolored.bluemap.core.world.World;
+import org.spongepowered.configurate.gson.GsonConfigurationLoader;
+import org.spongepowered.configurate.serialize.SerializationException;
 
 import java.io.File;
 import java.io.IOException;
@@ -72,6 +74,8 @@ public class Plugin {
 	private WebServerConfig webServerConfig;
 	private PluginConfig pluginConfig;
 
+	private PluginStatus pluginStatus;
+
 	private Map<UUID, World> worlds;
 	private Map<String, BmMap> maps;
 
@@ -82,7 +86,7 @@ public class Plugin {
 	private TimerTask saveTask;
 	private TimerTask metricsTask;
 
-	private Collection<RegionFileWatchService> regionFileWatchServices;
+	private Map<String, RegionFileWatchService> regionFileWatchServices;
 
 	private PlayerSkinUpdater skinUpdater;
 
@@ -118,6 +122,17 @@ public void load() throws IOException, ParseResourceException {
 						true
 				));
 
+				//load plugin status
+				try {
+					GsonConfigurationLoader loader = GsonConfigurationLoader.builder()
+							.file(new File(getCoreConfig().getDataFolder(), "pluginStatus.json"))
+							.build();
+					pluginStatus = loader.load().get(PluginStatus.class);
+				} catch (SerializationException ex) {
+					Logger.global.logWarning("Failed to load pluginStatus.json (invalid format), creating a new one...");
+					pluginStatus = new PluginStatus();
+				}
+
 				//create and start webserver
 				if (webServerConfig.isWebserverEnabled()) {
 					FileUtils.mkDirs(webServerConfig.getWebRoot());
@@ -168,11 +183,17 @@ public void load() throws IOException, ParseResourceException {
 
 				//update all maps
 				for (BmMap map : maps.values()) {
-					renderManager.scheduleRenderTask(new MapUpdateTask(map));
+					if (pluginStatus.getMapStatus(map).isUpdateEnabled()) {
+						renderManager.scheduleRenderTask(new MapUpdateTask(map));
+					}
 				}
 
 				//start render-manager
-				renderManager.start(coreConfig.getRenderThreadCount());
+				if (pluginStatus.isRenderThreadsEnabled()) {
+					renderManager.start(coreConfig.getRenderThreadCount());
+				} else {
+					Logger.global.logInfo("Render-Threads are STOPPED! Use the command 'bluemap start' to start them.");
+				}
 				
 				//update webapp and settings
 				blueMap.createOrUpdateWebApp(false);
@@ -194,12 +215,7 @@ public void load() throws IOException, ParseResourceException {
 				saveTask = new TimerTask() {
 					@Override
 					public void run() {
-						synchronized (Plugin.this) {
-							if (maps == null) return;
-							for (BmMap map : maps.values()) {
-								map.save();
-							}
-						}
+						save();
 					}
 				};
 				daemonTimer.schedule(saveTask, TimeUnit.MINUTES.toMillis(2), TimeUnit.MINUTES.toMillis(2));
@@ -215,14 +231,10 @@ public void run() {
 				daemonTimer.scheduleAtFixedRate(metricsTask, TimeUnit.MINUTES.toMillis(1), TimeUnit.MINUTES.toMillis(30));
 
 				//watch map-changes
-				this.regionFileWatchServices = new ArrayList<>();
+				this.regionFileWatchServices = new HashMap<>();
 				for (BmMap map : maps.values()) {
-					try {
-						RegionFileWatchService watcher = new RegionFileWatchService(renderManager, map, false);
-						watcher.start();
-						regionFileWatchServices.add(watcher);
-					} catch (IOException ex) {
-						Logger.global.logError("Failed to create file-watcher for map: " + map.getId() + " (This map might not automatically update)", ex);
+					if (pluginStatus.getMapStatus(map).isUpdateEnabled()) {
+						startWatchingMap(map);
 					}
 				}
 
@@ -245,6 +257,8 @@ public void unload() {
 		try {
 			loadingLock.interruptAndLock();
 			synchronized (this) {
+				//save
+				save();
 				
 				//disable api
 				if (api != null) api.unregister();
@@ -264,7 +278,7 @@ public void unload() {
 
 				//stop file-watchers
 				if (regionFileWatchServices != null) {
-					for (RegionFileWatchService watcher : regionFileWatchServices) {
+					for (RegionFileWatchService watcher : regionFileWatchServices.values()) {
 						watcher.close();
 					}
 					regionFileWatchServices.clear();
@@ -278,13 +292,6 @@ public void unload() {
 				if (webServer != null) webServer.close();
 				webServer = null;
 
-				//save renders
-				if (maps != null) {
-					for (BmMap map : maps.values()) {
-						map.save();
-					}
-				}
-				
 				//clear resources and configs
 				blueMap = null;
 				worlds = null;
@@ -295,6 +302,8 @@ public void unload() {
 				webServerConfig = null;
 				pluginConfig = null;
 
+				pluginStatus = null;
+
 				//done
 				loaded = false;
 			}
@@ -308,6 +317,44 @@ public void reload() throws IOException, ParseResourceException {
 		load();
 	}
 
+	public synchronized void save() {
+		if (pluginStatus != null) {
+			try {
+				GsonConfigurationLoader loader = GsonConfigurationLoader.builder()
+						.file(new File(getCoreConfig().getDataFolder(), "pluginStatus.json"))
+						.build();
+				loader.save(loader.createNode().set(PluginStatus.class, pluginStatus));
+			} catch (IOException ex) {
+				Logger.global.logError("Failed to save pluginStatus.json!", ex);
+			}
+		}
+
+		if (maps != null) {
+			for (BmMap map : maps.values()) {
+				map.save();
+			}
+		}
+	}
+
+	public synchronized void startWatchingMap(BmMap map) {
+		stopWatchingMap(map);
+
+		try {
+			RegionFileWatchService watcher = new RegionFileWatchService(renderManager, map, false);
+			watcher.start();
+			regionFileWatchServices.put(map.getId(), watcher);
+		} catch (IOException ex) {
+			Logger.global.logError("Failed to create file-watcher for map: " + map.getId() + " (This means the map might not automatically update)", ex);
+		}
+	}
+
+	public synchronized void stopWatchingMap(BmMap map) {
+		RegionFileWatchService watcher = regionFileWatchServices.remove(map.getId());
+		if (watcher != null) {
+			watcher.close();
+		}
+	}
+
 	public boolean flushWorldUpdates(UUID worldUUID) throws IOException {
 		return serverInterface.persistWorldChanges(worldUUID);
 	}
@@ -331,6 +378,10 @@ public WebServerConfig getWebServerConfig() {
 	public PluginConfig getPluginConfig() {
 		return pluginConfig;
 	}
+
+	public PluginStatus getPluginStatus() {
+		return pluginStatus;
+	}
 	
 	public World getWorld(UUID uuid){
 		return worlds.get(uuid);

BlueMapCommon/src/main/java/de/bluecolored/bluemap/common/plugin/PluginStatus.java

@@ -24,11 +24,44 @@
  */
 package de.bluecolored.bluemap.common.plugin;
 
+import de.bluecolored.bluemap.core.map.BmMap;
 import org.spongepowered.configurate.objectmapping.ConfigSerializable;
 
+import java.util.HashMap;
+import java.util.Map;
+
+@SuppressWarnings("FieldMayBeFinal")
 @ConfigSerializable
 public class PluginStatus {
 
+	private boolean renderThreadsEnabled = true;
+	private Map<String, MapStatus> maps = new HashMap<>();
 
+	public boolean isRenderThreadsEnabled() {
+		return renderThreadsEnabled;
+	}
+
+	public void setRenderThreadsEnabled(boolean renderThreadsEnabled) {
+		this.renderThreadsEnabled = renderThreadsEnabled;
+	}
+
+	public MapStatus getMapStatus(BmMap map) {
+		return maps.computeIfAbsent(map.getId(), k -> new MapStatus());
+	}
+
+	@ConfigSerializable
+	public static class MapStatus {
+
+		private boolean updateEnabled = true;
+
+		public boolean isUpdateEnabled() {
+			return updateEnabled;
+		}
+
+		public void setUpdateEnabled(boolean update) {
+			this.updateEnabled = update;
+		}
+
+	}
 
 }

BlueMapCommon/src/main/java/de/bluecolored/bluemap/common/plugin/commands/Commands.java

@@ -44,13 +44,12 @@
 import de.bluecolored.bluemap.api.marker.MarkerSet;
 import de.bluecolored.bluemap.api.marker.POIMarker;
 import de.bluecolored.bluemap.common.plugin.Plugin;
+import de.bluecolored.bluemap.common.plugin.PluginStatus;
 import de.bluecolored.bluemap.common.plugin.serverinterface.CommandSource;
 import de.bluecolored.bluemap.common.plugin.text.Text;
 import de.bluecolored.bluemap.common.plugin.text.TextColor;
 import de.bluecolored.bluemap.common.plugin.text.TextFormat;
-import de.bluecolored.bluemap.common.rendermanager.MapPurgeTask;
-import de.bluecolored.bluemap.common.rendermanager.MapUpdateTask;
-import de.bluecolored.bluemap.common.rendermanager.RenderTask;
+import de.bluecolored.bluemap.common.rendermanager.*;
 import de.bluecolored.bluemap.core.BlueMap;
 import de.bluecolored.bluemap.core.MinecraftVersion;
 import de.bluecolored.bluemap.core.logger.Logger;
@@ -140,18 +139,32 @@ public void init() {
 						
 				.build();
 		
-		LiteralCommandNode<S> pauseCommand = 
+		LiteralCommandNode<S> stopCommand =
 				literal("stop")
 				.requires(requirements("bluemap.stop"))
 				.executes(this::stopCommand)
 				.build();
 		
-		LiteralCommandNode<S> resumeCommand = 
+		LiteralCommandNode<S> startCommand =
 				literal("start")
 				.requires(requirements("bluemap.start"))
 				.executes(this::startCommand)
 				.build();
 
+		LiteralCommandNode<S> freezeCommand =
+				literal("freeze")
+				.requires(requirements("bluemap.freeze"))
+				.then(argument("map", StringArgumentType.string()).suggests(new MapSuggestionProvider<>(plugin))
+						.executes(this::freezeCommand))
+						.build();
+
+		LiteralCommandNode<S> unfreezeCommand =
+				literal("unfreeze")
+						.requires(requirements("bluemap.freeze"))
+						.then(argument("map", StringArgumentType.string()).suggests(new MapSuggestionProvider<>(plugin))
+								.executes(this::unfreezeCommand))
+						.build();
+
 		LiteralCommandNode<S> forceUpdateCommand =
 				addRenderArguments(
 						literal("force-update")
@@ -227,8 +240,10 @@ public void init() {
 		baseCommand.addChild(helpCommand);
 		baseCommand.addChild(reloadCommand);
 		baseCommand.addChild(debugCommand);
-		baseCommand.addChild(pauseCommand);
-		baseCommand.addChild(resumeCommand);
+		baseCommand.addChild(stopCommand);
+		baseCommand.addChild(startCommand);
+		baseCommand.addChild(freezeCommand);
+		baseCommand.addChild(unfreezeCommand);
 		baseCommand.addChild(forceUpdateCommand);
 		baseCommand.addChild(updateCommand);
 		baseCommand.addChild(cancelCommand);
@@ -521,26 +536,113 @@ public int stopCommand(CommandContext<S> context) {
 		CommandSource source = commandSourceInterface.apply(context.getSource());
 		
 		if (plugin.getRenderManager().isRunning()) {
-			plugin.getRenderManager().stop();
-			source.sendMessage(Text.of(TextColor.GREEN, "Render-Threads stopped!"));
-			return 1;
+			new Thread(() -> {
+				plugin.getPluginStatus().setRenderThreadsEnabled(false);
+
+				plugin.getRenderManager().stop();
+				source.sendMessage(Text.of(TextColor.GREEN, "Render-Threads stopped!"));
+
+				plugin.save();
+			}).start();
 		} else {
 			source.sendMessage(Text.of(TextColor.RED, "Render-Threads are already stopped!"));
 			return 0;
 		}
+
+		return 1;
 	}
 	
 	public int startCommand(CommandContext<S> context) {
 		CommandSource source = commandSourceInterface.apply(context.getSource());
 		
 		if (!plugin.getRenderManager().isRunning()) {
-			plugin.getRenderManager().start(plugin.getCoreConfig().getRenderThreadCount());
-			source.sendMessage(Text.of(TextColor.GREEN, "Render-Threads started!"));
-			return 1;
+			new Thread(() -> {
+				plugin.getPluginStatus().setRenderThreadsEnabled(true);
+
+				plugin.getRenderManager().start(plugin.getCoreConfig().getRenderThreadCount());
+				source.sendMessage(Text.of(TextColor.GREEN, "Render-Threads started!"));
+
+				plugin.save();
+			}).start();
 		} else {
 			source.sendMessage(Text.of(TextColor.RED, "Render-Threads are already running!"));
 			return 0;
 		}
+
+		return 1;
+	}
+
+	public int freezeCommand(CommandContext<S> context) {
+		CommandSource source = commandSourceInterface.apply(context.getSource());
+
+		// parse map argument
+		String mapString = context.getArgument("map", String.class);
+		BmMap map = parseMap(mapString).orElse(null);
+
+		if (map == null) {
+			source.sendMessage(Text.of(TextColor.RED, "There is no ", helper.mapHelperHover(), " with this name: ", TextColor.WHITE, mapString));
+			return 0;
+		}
+
+		PluginStatus.MapStatus mapStatus = plugin.getPluginStatus().getMapStatus(map);
+		if (mapStatus.isUpdateEnabled()) {
+			new Thread(() -> {
+				mapStatus.setUpdateEnabled(false);
+
+				plugin.stopWatchingMap(map);
+				plugin.getRenderManager().removeRenderTasksIf(task -> {
+					if (task instanceof MapUpdateTask)
+						return ((MapUpdateTask) task).getMap().equals(map);
+
+					if (task instanceof WorldRegionRenderTask)
+						return ((WorldRegionRenderTask) task).getMap().equals(map);
+
+					return false;
+				});
+
+				source.sendMessage(Text.of(TextColor.GREEN, "Map ", TextColor.WHITE, mapString, TextColor.GREEN, " is now frozen and will no longer be automatically updated!"));
+				source.sendMessage(Text.of(TextColor.GRAY, "Any currently scheduled updates for this map have been cancelled."));
+
+				plugin.save();
+			}).start();
+		} else {
+			source.sendMessage(Text.of(TextColor.RED, "This map is already frozen!"));
+			return 0;
+		}
+
+		return 1;
+	}
+
+	public int unfreezeCommand(CommandContext<S> context) {
+		CommandSource source = commandSourceInterface.apply(context.getSource());
+
+		// parse map argument
+		String mapString = context.getArgument("map", String.class);
+		BmMap map = parseMap(mapString).orElse(null);
+
+		if (map == null) {
+			source.sendMessage(Text.of(TextColor.RED, "There is no ", helper.mapHelperHover(), " with this name: ", TextColor.WHITE, mapString));
+			return 0;
+		}
+
+		PluginStatus.MapStatus mapStatus = plugin.getPluginStatus().getMapStatus(map);
+		if (!mapStatus.isUpdateEnabled()) {
+			new Thread(() -> {
+				mapStatus.setUpdateEnabled(true);
+
+				plugin.startWatchingMap(map);
+				plugin.getRenderManager().scheduleRenderTask(new MapUpdateTask(map));
+
+				source.sendMessage(Text.of(TextColor.GREEN, "Map ", TextColor.WHITE, mapString, TextColor.GREEN, " is no longer frozen and will be automatically updated!"));
+
+				plugin.save();
+			}).start();
+		} else {
+			source.sendMessage(Text.of(TextColor.RED, "This map is not frozen!"));
+			return 0;
+		}
+
+		return 1;
 	}
 
 	public int forceUpdateCommand(CommandContext<S> context) {
@@ -727,7 +829,21 @@ public int mapsCommand(CommandContext<S> context) {
 		
 		source.sendMessage(Text.of(TextColor.BLUE, "Maps loaded by BlueMap:"));
 		for (BmMap map : plugin.getMapTypes()) {
-			source.sendMessage(Text.of(TextColor.GRAY, " - ", TextColor.WHITE, map.getId(), TextColor.GRAY, " (" + map.getName() + ")").setHoverText(Text.of(TextColor.WHITE, "World: ", TextColor.GRAY, map.getWorld().getName())));
+			boolean unfrozen = plugin.getPluginStatus().getMapStatus(map).isUpdateEnabled();
+			if (unfrozen) {
+				source.sendMessage(Text.of(
+						TextColor.GRAY, " - ",
+						TextColor.WHITE, map.getId(),
+						TextColor.GRAY, " (" + map.getName() + ")"
+				).setHoverText(Text.of(TextColor.WHITE, "World: ", TextColor.GRAY, map.getWorld().getName())));
+			} else {
+				source.sendMessage(Text.of(
+						TextColor.GRAY, " - ",
+						TextColor.WHITE, map.getId(),
+						TextColor.GRAY, " (" + map.getName() + ") - ",
+						TextColor.AQUA, TextFormat.ITALIC, "frozen!"
+				).setHoverText(Text.of(TextColor.WHITE, "World: ", TextColor.GRAY, map.getWorld().getName())));
+			}
 		}
 		
 		return 1;
@@ -741,7 +857,7 @@ public int createMarkerCommand(CommandContext<S> context) {
 				.replace("<", "&lt;")
 				.replace(">", "&gt;");  //no html via commands
 		
-		// parse world/map argument
+		// parse map argument
 		String mapString = context.getArgument("map", String.class);
 		BmMap map = parseMap(mapString).orElse(null);
 		

BlueMapCommon/src/main/java/de/bluecolored/bluemap/common/rendermanager/RenderManager.java

@@ -29,6 +29,7 @@
 import java.util.*;
 import java.util.concurrent.ConcurrentLinkedDeque;
 import java.util.concurrent.atomic.AtomicInteger;
+import java.util.function.Predicate;
 
 public class RenderManager {
 	private static final AtomicInteger nextRenderManagerIndex = new AtomicInteger(0);
@@ -176,6 +177,17 @@ public boolean removeRenderTask(RenderTask task) {
 		}
 	}
 
+	public void removeRenderTasksIf(Predicate<RenderTask> removeCondition) {
+		synchronized (this.renderTasks) {
+			if (this.renderTasks.isEmpty()) return;
+
+			RenderTask first = renderTasks.removeFirst();
+			if (removeCondition.test(first)) first.cancel();
+			renderTasks.removeIf(removeCondition);
+			renderTasks.addFirst(first);
+		}
+	}
+
 	public void removeAllRenderTasks() {
 		synchronized (this.renderTasks) {
 			if (this.renderTasks.isEmpty()) return;