[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/block/BlockBreakEvent.java

@@ -3,6 +3,7 @@ package org.bukkit.event.block;
 import org.bukkit.block.Block;
 import org.bukkit.entity.Player;
 import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
 
 /**
  * Called when a block is broken by a player.
@@ -16,6 +17,7 @@ import org.bukkit.event.Cancellable;
 @SuppressWarnings("serial")
 public class BlockBreakEvent extends BlockEvent implements Cancellable {
 
+    private static final HandlerList handlers = new HandlerList();
     private Player player;
     private boolean cancel;
 
@@ -41,4 +43,13 @@ public class BlockBreakEvent extends BlockEvent implements Cancellable {
     public void setCancelled(boolean cancel) {
         this.cancel = cancel;
     }
+
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
 }

paper-api/src/main/java/org/bukkit/event/block/BlockBurnEvent.java

@@ -2,6 +2,7 @@ package org.bukkit.event.block;
 
 import org.bukkit.block.Block;
 import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
 
 /**
  * Called when a block is destroyed as a result of being burnt by fire.
@@ -10,6 +11,7 @@ import org.bukkit.event.Cancellable;
  */
 @SuppressWarnings("serial")
 public class BlockBurnEvent extends BlockEvent implements Cancellable {
+    private static final HandlerList handlers = new HandlerList();
     private boolean cancelled;
 
     public BlockBurnEvent(Block block) {
@@ -24,4 +26,13 @@ public class BlockBurnEvent extends BlockEvent implements Cancellable {
     public void setCancelled(boolean cancel) {
         this.cancelled = cancel;
     }
+
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
 }

paper-api/src/main/java/org/bukkit/event/block/BlockCanBuildEvent.java

@@ -2,6 +2,7 @@ package org.bukkit.event.block;
 
 import org.bukkit.block.Block;
 import org.bukkit.Material;
+import org.bukkit.event.HandlerList;
 
 /**
  * Called when we try to place a block, to see if we can build it here or not.
@@ -14,6 +15,7 @@ import org.bukkit.Material;
  */
 @SuppressWarnings("serial")
 public class BlockCanBuildEvent extends BlockEvent {
+    private static final HandlerList handlers = new HandlerList();
     protected boolean buildable;
     protected int material;
 
@@ -59,4 +61,13 @@ public class BlockCanBuildEvent extends BlockEvent {
     public int getMaterialId() {
         return material;
     }
+
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
 }

paper-api/src/main/java/org/bukkit/event/block/BlockDamageEvent.java

@@ -3,6 +3,7 @@ package org.bukkit.event.block;
 import org.bukkit.block.Block;
 import org.bukkit.entity.Player;
 import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
 import org.bukkit.inventory.ItemStack;
 
 /**
@@ -12,6 +13,7 @@ import org.bukkit.inventory.ItemStack;
  */
 @SuppressWarnings("serial")
 public class BlockDamageEvent extends BlockEvent implements Cancellable {
+    private static final HandlerList handlers = new HandlerList();
     private Player player;
     private boolean instaBreak;
     private boolean cancel;
@@ -68,4 +70,13 @@ public class BlockDamageEvent extends BlockEvent implements Cancellable {
     public void setCancelled(boolean cancel) {
         this.cancel = cancel;
     }
+
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
 }

paper-api/src/main/java/org/bukkit/event/block/BlockDispenseEvent.java

@@ -2,6 +2,7 @@ package org.bukkit.event.block;
 
 import org.bukkit.block.Block;
 import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
 import org.bukkit.inventory.ItemStack;
 import org.bukkit.util.Vector;
 
@@ -12,6 +13,7 @@ import org.bukkit.util.Vector;
  */
 @SuppressWarnings("serial")
 public class BlockDispenseEvent extends BlockEvent implements Cancellable {
+    private static final HandlerList handlers = new HandlerList();
 
     private boolean cancelled = false;
     private ItemStack item;
@@ -69,4 +71,13 @@ public class BlockDispenseEvent extends BlockEvent implements Cancellable {
     public void setCancelled(boolean cancel) {
         cancelled = cancel;
     }
+
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
 }

paper-api/src/main/java/org/bukkit/event/block/BlockEvent.java

@@ -7,7 +7,7 @@ import org.bukkit.event.Event;
  * Represents a block related event.
  */
 @SuppressWarnings("serial")
-public class BlockEvent extends Event {
+public abstract class BlockEvent extends Event {
     protected Block block;
 
     public BlockEvent(final Event.Type type, final Block theBlock) {

paper-api/src/main/java/org/bukkit/event/block/BlockFadeEvent.java

@@ -3,6 +3,7 @@ package org.bukkit.event.block;
 import org.bukkit.block.Block;
 import org.bukkit.block.BlockState;
 import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
 
 /**
  * Called when a block fades, melts or disappears based on world conditions
@@ -17,6 +18,7 @@ import org.bukkit.event.Cancellable;
  */
 @SuppressWarnings("serial")
 public class BlockFadeEvent extends BlockEvent implements Cancellable {
+    private static final HandlerList handlers = new HandlerList();
     private boolean cancelled;
     private BlockState newState;
 
@@ -42,4 +44,13 @@ public class BlockFadeEvent extends BlockEvent implements Cancellable {
     public void setCancelled(boolean cancel) {
         this.cancelled = cancel;
     }
+
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
 }

paper-api/src/main/java/org/bukkit/event/block/BlockFormEvent.java

@@ -3,6 +3,7 @@ package org.bukkit.event.block;
 import org.bukkit.block.Block;
 import org.bukkit.block.BlockState;
 import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
 
 /**
  * Called when a block is formed or spreads based on world conditions.
@@ -20,6 +21,7 @@ import org.bukkit.event.Cancellable;
  */
 @SuppressWarnings("serial")
 public class BlockFormEvent extends BlockEvent implements Cancellable {
+    private static final HandlerList handlers = new HandlerList();
     private boolean cancelled;
     private BlockState newState;
 
@@ -53,4 +55,13 @@ public class BlockFormEvent extends BlockEvent implements Cancellable {
     public void setCancelled(boolean cancel) {
         this.cancelled = cancel;
     }
+
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
 }

paper-api/src/main/java/org/bukkit/event/block/BlockFromToEvent.java

@@ -3,6 +3,7 @@ package org.bukkit.event.block;
 import org.bukkit.block.Block;
 import org.bukkit.block.BlockFace;
 import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
 
 /**
  * Represents events with a source block and a destination block, currently only applies to liquid (lava and water).
@@ -11,6 +12,7 @@ import org.bukkit.event.Cancellable;
  */
 @SuppressWarnings("serial")
 public class BlockFromToEvent extends BlockEvent implements Cancellable {
+    private static final HandlerList handlers = new HandlerList();
     protected Block to;
     protected BlockFace face;
     protected boolean cancel;
@@ -49,4 +51,13 @@ public class BlockFromToEvent extends BlockEvent implements Cancellable {
     public void setCancelled(boolean cancel) {
         this.cancel = cancel;
     }
+
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
 }

paper-api/src/main/java/org/bukkit/event/block/BlockIgniteEvent.java

@@ -4,6 +4,7 @@ import org.bukkit.block.Block;
 import org.bukkit.entity.Player;
 import org.bukkit.event.Cancellable;
 import org.bukkit.event.Event;
+import org.bukkit.event.HandlerList;
 
 /**
  * Called when a block is ignited. If you want to catch when a Player places fire, you need to use {@link BlockPlaceEvent}.
@@ -12,6 +13,7 @@ import org.bukkit.event.Event;
  */
 @SuppressWarnings("serial")
 public class BlockIgniteEvent extends BlockEvent implements Cancellable {
+    private static final HandlerList handlers = new HandlerList();
     private IgniteCause cause;
     private boolean cancel;
     private Player thePlayer;
@@ -71,4 +73,13 @@ public class BlockIgniteEvent extends BlockEvent implements Cancellable {
          */
         LIGHTNING,
     }
+
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
 }

paper-api/src/main/java/org/bukkit/event/block/BlockListener.java

@@ -5,6 +5,7 @@ import org.bukkit.event.Listener;
 /**
  * Handles all events thrown in relation to Blocks
  */
+@Deprecated
 public class BlockListener implements Listener {
 
     /**

paper-api/src/main/java/org/bukkit/event/block/BlockPhysicsEvent.java

@@ -3,12 +3,14 @@ package org.bukkit.event.block;
 import org.bukkit.block.Block;
 import org.bukkit.Material;
 import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
 
 /**
  * Thrown when a block physics check is called
  */
 @SuppressWarnings("serial")
 public class BlockPhysicsEvent extends BlockEvent implements Cancellable {
+    private static final HandlerList handlers = new HandlerList();
     private final int changed;
     private boolean cancel = false;
 
@@ -42,4 +44,13 @@ public class BlockPhysicsEvent extends BlockEvent implements Cancellable {
     public void setCancelled(boolean cancel) {
         this.cancel = cancel;
     }
+
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
 }

paper-api/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;
+    }
 }

paper-api/src/main/java/org/bukkit/event/block/BlockPistonRetractEvent.java

@@ -3,9 +3,11 @@ package org.bukkit.event.block;
 import org.bukkit.Location;
 import org.bukkit.block.Block;
 import org.bukkit.block.BlockFace;
+import org.bukkit.event.HandlerList;
 
 @SuppressWarnings("serial")
 public class BlockPistonRetractEvent extends BlockPistonEvent {
+    private static final HandlerList handlers = new HandlerList();
     public BlockPistonRetractEvent(Block block, BlockFace direction) {
         super(Type.BLOCK_PISTON_RETRACT, block, direction);
     }
@@ -19,4 +21,13 @@ public class BlockPistonRetractEvent extends BlockPistonEvent {
     public Location getRetractLocation() {
         return getBlock().getRelative(getDirection(), 2).getLocation();
     }
+
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
 }

paper-api/src/main/java/org/bukkit/event/block/BlockPlaceEvent.java

@@ -4,6 +4,7 @@ import org.bukkit.block.Block;
 import org.bukkit.block.BlockState;
 import org.bukkit.entity.Player;
 import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
 import org.bukkit.inventory.ItemStack;
 
 /**
@@ -13,6 +14,7 @@ import org.bukkit.inventory.ItemStack;
  */
 @SuppressWarnings("serial")
 public class BlockPlaceEvent extends BlockEvent implements Cancellable {
+    private static final HandlerList handlers = new HandlerList();
     protected boolean cancel;
     protected boolean canBuild;
     protected Block placedAgainst;
@@ -106,4 +108,13 @@ public class BlockPlaceEvent extends BlockEvent implements Cancellable {
     public void setBuild(boolean canBuild) {
         this.canBuild = canBuild;
     }
+
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
 }

paper-api/src/main/java/org/bukkit/event/block/BlockRedstoneEvent.java

@@ -1,12 +1,14 @@
 package org.bukkit.event.block;
 
 import org.bukkit.block.Block;
+import org.bukkit.event.HandlerList;
 
 /**
  * Called when a redstone current changes
  */
 @SuppressWarnings("serial")
 public class BlockRedstoneEvent extends BlockEvent {
+    private static final HandlerList handlers = new HandlerList();
     private int oldCurrent;
     private int newCurrent;
 
@@ -42,4 +44,13 @@ public class BlockRedstoneEvent extends BlockEvent {
     public void setNewCurrent(int newCurrent) {
         this.newCurrent = newCurrent;
     }
+
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
 }

paper-api/src/main/java/org/bukkit/event/block/BlockSpreadEvent.java

@@ -2,6 +2,7 @@ package org.bukkit.event.block;
 
 import org.bukkit.block.Block;
 import org.bukkit.block.BlockState;
+import org.bukkit.event.HandlerList;
 
 /**
  * Called when a block spreads based on world conditions.
@@ -19,6 +20,7 @@ import org.bukkit.block.BlockState;
  */
 @SuppressWarnings("serial")
 public class BlockSpreadEvent extends BlockFormEvent {
+    private static final HandlerList handlers = new HandlerList();
     private Block source;
 
     public BlockSpreadEvent(Block block, Block source, BlockState newState) {
@@ -34,4 +36,13 @@ public class BlockSpreadEvent extends BlockFormEvent {
     public Block getSource() {
         return source;
     }
+
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
 }

paper-api/src/main/java/org/bukkit/event/block/LeavesDecayEvent.java

@@ -2,6 +2,7 @@ package org.bukkit.event.block;
 
 import org.bukkit.block.Block;
 import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
 
 /**
  * Called when leaves are decaying naturally.
@@ -10,6 +11,7 @@ import org.bukkit.event.Cancellable;
  */
 @SuppressWarnings("serial")
 public class LeavesDecayEvent extends BlockEvent implements Cancellable {
+    private static final HandlerList handlers = new HandlerList();
     private boolean cancel = false;
 
     public LeavesDecayEvent(final Block block) {
@@ -23,4 +25,13 @@ public class LeavesDecayEvent extends BlockEvent implements Cancellable {
     public void setCancelled(boolean cancel) {
         this.cancel = cancel;
     }
+
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
 }

paper-api/src/main/java/org/bukkit/event/block/SignChangeEvent.java

@@ -3,6 +3,7 @@ package org.bukkit.event.block;
 import org.bukkit.block.Block;
 import org.bukkit.entity.Player;
 import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
 
 /**
  * Called when a sign is changed by a player.
@@ -11,6 +12,7 @@ import org.bukkit.event.Cancellable;
  */
 @SuppressWarnings("serial")
 public class SignChangeEvent extends BlockEvent implements Cancellable {
+    private static final HandlerList handlers = new HandlerList();
     private boolean cancel = false;
     private Player player;
     private String[] lines;
@@ -68,4 +70,13 @@ public class SignChangeEvent extends BlockEvent implements Cancellable {
     public void setCancelled(boolean cancel) {
         this.cancel = cancel;
     }
+
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
 }