When unloading world, only save if it has data

src/com/dre/brewery/BCauldron.java

@@ -535,6 +535,13 @@ public class BCauldron {
 		return bcauldrons.remove(block) != null;
 	}
 
+	/**
+	 * Are any Cauldrons in that World
+	 */
+	public static boolean hasDataInWorld(String name) {
+		return bcauldrons.keySet().stream().anyMatch(block -> block.getWorld().getName().equals(name));
+	}
+
 	// 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) {

src/com/dre/brewery/Barrel.java

@@ -472,6 +472,13 @@ public class Barrel implements InventoryHolder {
 		return body.getBrokenBlock(force);
 	}
 
+	/**
+	 * Are any Barrels in that World
+	 */
+	public static boolean hasDataInWorld(String name) {
+		return barrels.stream().anyMatch(barrel -> barrel.spigot.getWorld().getName().equals(name));
+	}
+
 	/**
 	 * unloads barrels that are in a unloading world
 	 */

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

@@ -453,7 +453,7 @@ public class BData {
 		// Increment the Data Mutex if it is not -1
 		while (BData.dataMutex.updateAndGet(i -> i >= 0 ? i + 1 : i) <= 0) {
 			wait++;
-			if (wait > 60) {
+			if (!BConfig.loadDataAsync || wait > 60) {
 				P.p.errorLog("Could not load World Data, Mutex: " + BData.dataMutex.get());
 				return false;
 			}

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

@@ -45,10 +45,13 @@ public class WorldListener implements Listener {
 
 	@EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
 	public void onWorldUnload(WorldUnloadEvent event) {
-		DataSave.save(true);
 		String worldName = event.getWorld().getName();
+		if (Barrel.hasDataInWorld(worldName) || BCauldron.hasDataInWorld(worldName)) {
+			P.p.log("Saving due to data in unloading world");
+			DataSave.save(true);
 			Barrel.onUnload(worldName);
 			BCauldron.onUnload(worldName);
+		}
 		Wakeup.onUnload(worldName);
 	}