[Bleeding] Changed event system into a new, much faster design. Huge thanks to @zml2008 & @lahwran.

src/main/java/org/bukkit/event/block/BlockPistonExtendEvent.java

@@ -6,9 +6,11 @@ import java.util.List;
 
 import org.bukkit.block.Block;
 import org.bukkit.block.BlockFace;
+import org.bukkit.event.HandlerList;
 
 @SuppressWarnings("serial")
 public class BlockPistonExtendEvent extends BlockPistonEvent {
+    private static final HandlerList handlers = new HandlerList();
     private int length;
     private List<Block> blocks;
 
@@ -42,4 +44,13 @@ public class BlockPistonExtendEvent extends BlockPistonEvent {
         }
         return blocks;
     }
+
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
 }