Support async engine tasks and optimize MUtil.random a bit

src/com/massivecraft/mcore/Engine.java

@@ -2,6 +2,7 @@ package com.massivecraft.mcore;
 
 import org.bukkit.event.Listener;
 import org.bukkit.plugin.Plugin;
+import org.bukkit.scheduler.BukkitTask;
 
 public interface Engine extends Listener, Runnable
 {
@@ -12,5 +13,10 @@ public interface Engine extends Listener, Runnable
 	
 	public Long getDelay();
 	public Long getPeriod();
+	
 	public Integer getTaskId();
+	
+	public BukkitTask getBukkitTask();
+	public boolean isSync();
+	
 }

src/com/massivecraft/mcore/EngineAbstract.java

@@ -2,6 +2,7 @@ package com.massivecraft.mcore;
 
 import org.bukkit.Bukkit;
 import org.bukkit.event.HandlerList;
+import org.bukkit.scheduler.BukkitTask;
 
 public abstract class EngineAbstract implements Engine
 {
@@ -9,8 +10,8 @@ public abstract class EngineAbstract implements Engine
 	// FIELDS
 	// -------------------------------------------- //
 	
-	private Integer taskId;
+	private BukkitTask task;
-	@Override public Integer getTaskId() { return this.taskId; }
+	@Override public Integer getTaskId() { return this.task.getTaskId(); }
 	
 	// -------------------------------------------- //
 	// OVERRIDE
@@ -22,7 +23,14 @@ public abstract class EngineAbstract implements Engine
 		Bukkit.getPluginManager().registerEvents(this, this.getPlugin());
 		if (this.getPeriod() != null)
 		{
-			this.taskId = Bukkit.getScheduler().scheduleSyncRepeatingTask(this.getPlugin(), this, this.getDelay(), this.getPeriod());
+			if (this.isSync())
+			{
+				Bukkit.getScheduler().runTaskTimer(this.getPlugin(), this, this.getDelay(), this.getPeriod());
+			}
+			else
+			{
+				Bukkit.getScheduler().runTaskTimerAsynchronously(this.getPlugin(), this, this.getDelay(), this.getPeriod());
+			}
 		}
 	}
 
@@ -30,10 +38,10 @@ public abstract class EngineAbstract implements Engine
 	public void deactivate()
 	{
 		HandlerList.unregisterAll(this);
-		if (this.getTaskId() != null)
+		if (this.task != null)
 		{
-			Bukkit.getScheduler().cancelTask(this.getTaskId());
+			this.task.cancel();
-			this.taskId = null;
+			this.task = null;
 		}
 	}
 	
@@ -55,4 +63,16 @@ public abstract class EngineAbstract implements Engine
 		
 	}
 	
+	@Override
+	public BukkitTask getBukkitTask()
+	{
+		return this.task;
+	}
+	
+	@Override
+	public boolean isSync()
+	{
+		return true;
+	}
+	
 }

src/com/massivecraft/mcore/util/MUtil.java

@@ -487,7 +487,16 @@ public class MUtil
 		if (coll.size() == 0) return null;
 		if (coll.size() == 1) return coll.iterator().next();
 		int index = MCore.random.nextInt(coll.size());
-		return new ArrayList<T>(coll).get(index);
+		List<T> list = null;
+		if (coll instanceof List<?>)
+		{
+			list = (List<T>)coll;
+		}
+		else
+		{
+			list = new ArrayList<T>(coll);
+		}
+		return list.get(index);
 	}
 	
 	public static <T> List<T> random(Collection<T> coll, int count)