Invalidate caches for unused objects

src/main/java/de/t14d3/zones/Zones.java

@@ -5,6 +5,7 @@
 import de.t14d3.zones.integrations.FAWEIntegration;
 import de.t14d3.zones.integrations.PlaceholderAPI;
 import de.t14d3.zones.integrations.WorldEditSession;
+import de.t14d3.zones.listeners.ChunkEventListener;
 import de.t14d3.zones.listeners.CommandListener;
 import de.t14d3.zones.listeners.PlayerInteractListener;
 import de.t14d3.zones.listeners.PlayerQuitListener;
@@ -79,6 +80,7 @@ public void onEnable() {
         // Register listeners
         this.getServer().getPluginManager().registerEvents(new PlayerInteractListener(regionManager, permissionManager, this), this);
         this.getServer().getPluginManager().registerEvents(new PlayerQuitListener(this), this);
+        this.getServer().getPluginManager().registerEvents(new ChunkEventListener(this), this);
 
         // Populate Types
         types = new Types();

src/main/java/de/t14d3/zones/listeners/ChunkEventListener.java

@@ -0,0 +1,20 @@
+package de.t14d3.zones.listeners;
+
+import de.t14d3.zones.Zones;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+import org.bukkit.event.world.ChunkUnloadEvent;
+
+public class ChunkEventListener implements Listener {
+
+    private final Zones plugin;
+
+    public ChunkEventListener(Zones plugin) {
+        this.plugin = plugin;
+    }
+
+    @EventHandler
+    public void onChunkUnload(ChunkUnloadEvent event) {
+        plugin.getPermissionManager().invalidateInteractionCacheForChunk(event.getChunk().getX(), event.getChunk().getZ(), event.getWorld().getName());
+    }
+}

src/main/java/de/t14d3/zones/listeners/PlayerQuitListener.java

@@ -19,5 +19,6 @@ public void onPlayerQuit(PlayerQuitEvent event) {
         zones.selection.remove(uuid);
         zones.particles.remove(uuid);
         zones.getPermissionManager().invalidateInteractionCache(uuid);
+        zones.getPermissionManager().invalidateCache(uuid.toString());
     }
 }