Make sure chunks are loaded before teleporting players.

src/de/craftinc/gates/Plugin.java

@@ -5,6 +5,7 @@ import java.util.logging.Level;
 import java.util.logging.Logger;
 
 
+import de.craftinc.gates.listeners.ChunkLoadListener;
 import de.craftinc.gates.listeners.PlayerMoveListener;
 import net.milkbowl.vault.permission.Permission;
 
@@ -29,6 +30,7 @@ public class Plugin extends JavaPlugin
 	
 	private String baseCommand;
 	private PlayerMoveListener playerListener = new PlayerMoveListener();
+    private ChunkLoadListener chunkLoadListener = new ChunkLoadListener();
 	private List<BaseCommand> commands = new ArrayList<BaseCommand>();
 	private GatesManager gatesManager = new GatesManager();
 	
@@ -112,6 +114,7 @@ public class Plugin extends JavaPlugin
 		// Register events
 		PluginManager pm = this.getServer().getPluginManager();
 		pm.registerEvents(this.playerListener, this);
+        pm.registerEvents(this.chunkLoadListener, this);
 		
 		// Load gates
 		gatesManager.loadGatesFromDisk();
@@ -119,6 +122,12 @@ public class Plugin extends JavaPlugin
 		log("Enabled");
 	}
 
+
+    public ChunkLoadListener getChunkLoadListener()
+    {
+        return chunkLoadListener;
+    }
+
 	
 	// -------------------------------------------- //
 	// Commands

src/de/craftinc/gates/listeners/ChunkLoadListener.java

@@ -0,0 +1,45 @@
+package de.craftinc.gates.listeners;
+
+import de.craftinc.gates.Plugin;
+import de.craftinc.gates.util.TeleportRequest;
+import org.bukkit.ChatColor;
+import org.bukkit.Chunk;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+import org.bukkit.event.world.ChunkLoadEvent;
+
+import java.util.HashMap;
+
+
+public class ChunkLoadListener implements Listener
+{
+    private HashMap<Chunk, TeleportRequest> pendingRequests = new HashMap<Chunk, TeleportRequest>();
+
+    @EventHandler(priority = EventPriority.NORMAL)
+    public void onChunkLoad(ChunkLoadEvent event)
+    {
+        Chunk c = event.getChunk();
+        TeleportRequest request = pendingRequests.get(c);
+
+        if (request != null) {
+
+            pendingRequests.remove(c);
+
+            Player p = request.getPlayer();
+            p.teleport(request.getDestination());
+            p.sendMessage(ChatColor.DARK_AQUA + "Thank you for traveling with Craft Inc. Gates.");
+        }
+    }
+
+
+    public void addTeleportRequest(TeleportRequest request)
+    {
+        if (request == null) {
+            throw new IllegalArgumentException("The request must not be null!");
+        }
+
+        this.pendingRequests.put(request.getDestination().getChunk(), request);
+    }
+}

src/de/craftinc/gates/listeners/PlayerMoveListener.java

@@ -2,13 +2,12 @@ package de.craftinc.gates.listeners;
 
 import java.util.Calendar;
 import java.util.HashMap;
-import java.util.logging.Level;
 
+import de.craftinc.gates.util.TeleportRequest;
 import org.bukkit.ChatColor;
 import org.bukkit.Chunk;
 import org.bukkit.Location;
 import org.bukkit.World;
-import org.bukkit.block.Block;
 import org.bukkit.entity.Player;
 import org.bukkit.event.EventHandler;
 import org.bukkit.event.EventPriority;
@@ -60,41 +59,45 @@ public class PlayerMoveListener implements Listener
 				event.getPlayer().sendMessage(ChatColor.RED + "You are not allowed to use this gate!");
 				this.lastBorderMessage.put(playerName, now);
 			}
-			
-			return;
 		}
-		
+        else {
-		// Teleport the player
+            this.teleportPlayer(event.getPlayer(), gateAtLocation);
-		checkChunkLoad(gateAtLocation.getLocation().getBlock());
+        }
-		
-		Location gateExit = gateAtLocation.getExit();
-		Location gateLocation = gateAtLocation.getLocation();
-		Location playerLocation = event.getPlayer().getLocation();
-		
-        Float newYaw = gateExit.getYaw() - gateLocation.getYaw() + playerLocation.getYaw();
-        
-        Location teleportToLocation = new Location( gateExit.getWorld(),
-        											gateExit.getX(),
-        											gateExit.getY(),
-        											gateExit.getZ(),
-					                                newYaw, 
-					                                playerLocation.getPitch() );
-                    
-		event.getPlayer().teleport(teleportToLocation);
-		event.setTo(teleportToLocation);
-		
-		event.getPlayer().sendMessage(ChatColor.DARK_AQUA + "Thank you for traveling with Craft Inc. Gates.");
 	}
-	
+
-	
+
-	private void checkChunkLoad(Block b) 
+    /**
+     * Teleports a player. This method will check if the destination chunk is loaded and will wait until the chunk
+     * is loaded before executing the teleportion event.
+     * @param p The player to teleport.
+     * @param g The gate to which exit the player will be teleported.
+     */
+	private void teleportPlayer(Player p, Gate g)
 	{
-		World w = b.getWorld();
+        Location playerLocation = p.getLocation();
-		Chunk c = b.getChunk();
+        Location exit = g.getExit();
-		
+
-		if (!w.isChunkLoaded(c))
+        Float newYaw = g.getExit().getYaw() - g.getLocation().getYaw() + playerLocation.getYaw();
-		{
+
-		    Plugin.log(Level.FINE, "Loading chunk: " + c.toString() + " on: " + w.toString());
+        Location teleportToLocation = new Location( g.getExit().getWorld(),
+                                                    g.getExit().getX(),
+                                                    g.getExit().getY(),
+                                                    g.getExit().getZ(),
+                                                    newYaw,
+                                                    playerLocation.getPitch()
+                                                  );
+
+        Chunk c = exit.getChunk();
+        World w = exit.getWorld();
+
+		if (w.isChunkLoaded(c)) {
+            p.teleport(teleportToLocation);
+            p.sendMessage(ChatColor.DARK_AQUA + "Thank you for traveling with Craft Inc. Gates.");
+        }
+        else {
+            TeleportRequest request = new TeleportRequest(p, exit);
+            Plugin.getPlugin().getChunkLoadListener().addTeleportRequest(request);
+
 			w.loadChunk(c);
 		}
 	}

src/de/craftinc/gates/util/TeleportRequest.java

@@ -0,0 +1,11 @@
+package de.craftinc.gates.util;
+
+/**
+ * Created with IntelliJ IDEA.
+ * User: tobi
+ * Date: 26.05.13
+ * Time: 14:28
+ * To change this template use File | Settings | File Templates.
+ */
+public class TeleportRequest {
+}