Async Saving on World Unload

src/com/dre/brewery/BCauldron.java

@@ -507,14 +507,22 @@ public class BCauldron {
 	/**
 	 * Are any Cauldrons in that World
 	 */
-	public static boolean hasDataInWorld(String name) {
-		return bcauldrons.keySet().stream().anyMatch(block -> block.getWorld().getName().equals(name));
+	public static boolean hasDataInWorld(World world) {
+		return bcauldrons.keySet().stream().anyMatch(block -> block.getWorld().equals(world));
 	}
 
 	// unloads cauldrons that are in a unloading world
 	// as they were written to file just before, this is safe to do
-	public static void onUnload(String name) {
-		bcauldrons.keySet().removeIf(block -> block.getWorld().getName().equals(name));
+	public static void onUnload(World world) {
+		bcauldrons.keySet().removeIf(block -> block.getWorld().equals(world));
+	}
+
+	/**
+	 * Unload all Cauldrons that have are in a unloaded World
+	 */
+	public static void unloadWorlds() {
+		List<World> worlds = P.p.getServer().getWorlds();
+		bcauldrons.keySet().removeIf(block -> !worlds.contains(block.getWorld()));
 	}
 
 	public static void save(ConfigurationSection config, ConfigurationSection oldData) {

src/com/dre/brewery/Barrel.java

@@ -14,6 +14,7 @@ import org.bukkit.Location;
 import org.bukkit.Material;
 import org.bukkit.Sound;
 import org.bukkit.SoundCategory;
+import org.bukkit.World;
 import org.bukkit.block.Block;
 import org.bukkit.configuration.ConfigurationSection;
 import org.bukkit.entity.HumanEntity;
@@ -125,13 +126,9 @@ public class Barrel implements InventoryHolder {
 
 		// Call event
 		BarrelAccessEvent accessEvent = new BarrelAccessEvent(this, player, event.getClickedBlock(), event.getBlockFace());
-		// Listened to by WGBarrel7, WGBarrelNew, WGBarrelOld, GriefPreventionBarrel (IntegrationListener)
+		// Listened to by IntegrationListener
 		P.p.getServer().getPluginManager().callEvent(accessEvent);
-		if (accessEvent.isCancelled()) {
-			return false;
-		}
-
-		return true;
+		return !accessEvent.isCancelled();
 	}
 
 	/**
@@ -475,15 +472,23 @@ public class Barrel implements InventoryHolder {
 	/**
 	 * Are any Barrels in that World
 	 */
-	public static boolean hasDataInWorld(String name) {
-		return barrels.stream().anyMatch(barrel -> barrel.spigot.getWorld().getName().equals(name));
+	public static boolean hasDataInWorld(World world) {
+		return barrels.stream().anyMatch(barrel -> barrel.spigot.getWorld().equals(world));
 	}
 
 	/**
 	 * unloads barrels that are in a unloading world
 	 */
-	public static void onUnload(String name) {
-		barrels.removeIf(barrel -> barrel.spigot.getWorld().getName().equals(name));
+	public static void onUnload(World world) {
+		barrels.removeIf(barrel -> barrel.spigot.getWorld().equals(world));
+	}
+
+	/**
+	 * Unload all Barrels that have a Block in a unloaded World
+	 */
+	public static void unloadWorlds() {
+		List<World> worlds = P.p.getServer().getWorlds();
+		barrels.removeIf(barrel -> !worlds.contains(barrel.spigot.getWorld()));
 	}
 
 	/**

src/com/dre/brewery/Wakeup.java

@@ -2,6 +2,7 @@ package com.dre.brewery;
 
 import com.dre.brewery.utility.BUtil;
 import org.bukkit.Location;
+import org.bukkit.World;
 import org.bukkit.command.CommandSender;
 import org.bukkit.configuration.ConfigurationSection;
 import org.bukkit.entity.Player;
@@ -266,8 +267,13 @@ public class Wakeup {
 		}
 	}
 
-	public static void onUnload(String worldName) {
-		wakeups.removeIf(wakeup -> wakeup.loc.getWorld().getName().equals(worldName));
+	public static void onUnload(World world) {
+		wakeups.removeIf(wakeup -> wakeup.loc.getWorld().equals(world));
+	}
+
+	public static void unloadWorlds() {
+		List<World> worlds = P.p.getServer().getWorlds();
+		wakeups.removeIf(wakeup -> !worlds.contains(wakeup.loc.getWorld()));
 	}
 
 }

src/com/dre/brewery/filedata/DataSave.java

@@ -11,6 +11,7 @@ import org.bukkit.scheduler.BukkitRunnable;
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.concurrent.CopyOnWriteArrayList;
 
 public class DataSave extends BukkitRunnable {
 
@@ -19,18 +20,22 @@ public class DataSave extends BukkitRunnable {
 	public static int autosave = 3;
 	final public static String dataVersion = "1.2";
 	public static DataSave running;
+	public static List<World> unloadingWorlds = new CopyOnWriteArrayList<>();
 
 	public ReadOldData read;
-	private long time;
+	private final long time;
+	private final List<World> loadedWorlds;
 	public boolean collected = false;
 
 	// Not Thread-Safe! Needs to be run in main thread but uses async Read/Write
 	public DataSave(ReadOldData read) {
 		this.read = read;
 		time = System.currentTimeMillis();
+		loadedWorlds = P.p.getServer().getWorlds();
 	}
 
 
+	// Running in Main Thread
 	@Override
 	public void run() {
 		try {
@@ -107,6 +112,20 @@ public class DataSave extends BukkitRunnable {
 
 			collected = true;
 
+			if (!unloadingWorlds.isEmpty()) {
+				try {
+					for (World world : unloadingWorlds) {
+						// In the very most cases, it is just one world, so just looping like this is fine
+						Barrel.onUnload(world);
+						BCauldron.onUnload(world);
+						Wakeup.onUnload(world);
+					}
+				} catch (Exception e) {
+					e.printStackTrace();
+				}
+				unloadingWorlds.clear();
+			}
+
 			P.p.debugLog("saving: " + ((System.nanoTime() - saveTime) / 1000000.0) + "ms");
 
 			if (P.p.isEnabled()) {
@@ -121,6 +140,22 @@ public class DataSave extends BukkitRunnable {
 		}
 	}
 
+	public void saveWorldNames(FileConfiguration root, ConfigurationSection old) {
+		if (old != null) {
+			root.set("Worlds", old);
+		}
+		for (World world : loadedWorlds) {
+			String worldName = world.getName();
+			if (worldName.startsWith("DXL_")) {
+				worldName = BUtil.getDxlName(worldName);
+				root.set("Worlds." + worldName, 0);
+			} else {
+				worldName = world.getUID().toString();
+				root.set("Worlds." + worldName, world.getName());
+			}
+		}
+	}
+
 	// Finish the collection of data immediately
 	public void now() {
 		if (!read.done) {
@@ -164,20 +199,4 @@ public class DataSave extends BukkitRunnable {
 			lastSave++;
 		}
 	}
-
-	public static void saveWorldNames(FileConfiguration root, ConfigurationSection old) {
-		if (old != null) {
-			root.set("Worlds", old);
-		}
-		for (World world : P.p.getServer().getWorlds()) {
-			String worldName = world.getName();
-			if (worldName.startsWith("DXL_")) {
-				worldName = BUtil.getDxlName(worldName);
-				root.set("Worlds." + worldName, 0);
-			} else {
-				worldName = world.getUID().toString();
-				root.set("Worlds." + worldName, world.getName());
-			}
-		}
-	}
 }

src/com/dre/brewery/listeners/WorldListener.java

@@ -45,13 +45,17 @@ public class WorldListener implements Listener {
 
 	@EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
 	public void onWorldUnload(WorldUnloadEvent event) {
-		String worldName = event.getWorld().getName();
-		if (Barrel.hasDataInWorld(worldName) || BCauldron.hasDataInWorld(worldName)) {
-			DataSave.save(true);
-			Barrel.onUnload(worldName);
-			BCauldron.onUnload(worldName);
+		World world = event.getWorld();
+		if (DataSave.running == null) {
+			// No datasave running, save data if we have any in that world
+			if (Barrel.hasDataInWorld(world) || BCauldron.hasDataInWorld(world)) {
+				DataSave.unloadingWorlds.add(world);
+				DataSave.save(false);
+			}
+		} else {
+			// already running, tell it to unload world
+			DataSave.unloadingWorlds.add(world);
 		}
-		Wakeup.onUnload(worldName);
 	}
 
 }