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

By: Nathan Adams <dinnerbone@dinnerbone.com>

paper-api/src/main/java/org/bukkit/event/painting/PaintingBreakEvent.java

@@ -2,12 +2,14 @@ package org.bukkit.event.painting;
 
 import org.bukkit.entity.Painting;
 import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
 
 /**
  * Triggered when a painting is removed
  */
 @SuppressWarnings("serial")
 public class PaintingBreakEvent extends PaintingEvent implements Cancellable {
+    private static final HandlerList handlers = new HandlerList();
 
     private boolean cancelled;
     private RemoveCause cause;
@@ -59,4 +61,13 @@ public class PaintingBreakEvent extends PaintingEvent implements Cancellable {
          */
         PHYSICS,
     }
+
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
 }

paper-api/src/main/java/org/bukkit/event/painting/PaintingEvent.java

@@ -7,7 +7,7 @@ import org.bukkit.event.Event;
  * Represents a painting-related event.
  */
 @SuppressWarnings("serial")
-public class PaintingEvent extends Event {
+public abstract class PaintingEvent extends Event {
 
     protected Painting painting;
 

paper-api/src/main/java/org/bukkit/event/painting/PaintingPlaceEvent.java

@@ -6,12 +6,14 @@ import org.bukkit.entity.Painting;
 import org.bukkit.entity.Player;
 import org.bukkit.event.Cancellable;
 import org.bukkit.event.Event;
+import org.bukkit.event.HandlerList;
 
 /**
  * Triggered when a painting is created in the world
  */
 @SuppressWarnings("serial")
 public class PaintingPlaceEvent extends PaintingEvent implements Cancellable {
+    private static final HandlerList handlers = new HandlerList();
 
     private boolean cancelled;
 
@@ -60,4 +62,13 @@ public class PaintingPlaceEvent extends PaintingEvent implements Cancellable {
     public void setCancelled(boolean cancel) {
         this.cancelled = cancel;
     }
+
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
 }