Simplify InventoryAction implementation

none of these action types are able to fail now.

src/pocketmine/inventory/transaction/InventoryTransaction.php

@@ -321,11 +321,7 @@ class InventoryTransaction{
 		}
 
 		foreach($this->actions as $action){
-			if($action->execute($this->source)){
-				$action->onExecuteSuccess($this->source);
-			}else{
-				$action->onExecuteFail($this->source);
-			}
+			$action->execute($this->source);
 		}
 
 		$this->hasExecuted = true;

src/pocketmine/inventory/transaction/action/CreativeInventoryAction.php

@@ -68,18 +68,8 @@ class CreativeInventoryAction extends InventoryAction{
 	 * No need to do anything extra here: this type just provides a place for items to disappear or appear from.
 	 *
 	 * @param Player $source
-	 *
-	 * @return bool
 	 */
-	public function execute(Player $source) : bool{
-		return true;
-	}
-
-	public function onExecuteSuccess(Player $source) : void{
-
-	}
-
-	public function onExecuteFail(Player $source) : void{
+	public function execute(Player $source) : void{
 
 	}
 }

src/pocketmine/inventory/transaction/action/DropItemAction.php

@@ -55,19 +55,8 @@ class DropItemAction extends InventoryAction{
 	 * Drops the target item in front of the player.
 	 *
 	 * @param Player $source
-	 *
-	 * @return bool
 	 */
-	public function execute(Player $source) : bool{
+	public function execute(Player $source) : void{
 		$source->dropItem($this->targetItem);
-		return true;
-	}
-
-	public function onExecuteSuccess(Player $source) : void{
-
-	}
-
-	public function onExecuteFail(Player $source) : void{
-
 	}
 }

src/pocketmine/inventory/transaction/action/InventoryAction.php

@@ -88,28 +88,10 @@ abstract class InventoryAction{
 	}
 
 	/**
-	 * Performs actions needed to complete the inventory-action server-side. Returns if it was successful. Will return
-	 * false if plugins cancelled events. This will only be called if the transaction which it is part of is considered
-	 * valid.
-	 *
-	 * @param Player $source
-	 *
-	 * @return bool
-	 */
-	abstract public function execute(Player $source) : bool;
-
-	/**
-	 * Performs additional actions when this inventory-action completed successfully.
+	 * Performs actions needed to complete the inventory-action server-side. This will only be called if the transaction
+	 * which it is part of is considered valid.
 	 *
 	 * @param Player $source
 	 */
-	abstract public function onExecuteSuccess(Player $source) : void;
-
-	/**
-	 * Performs additional actions when this inventory-action did not complete successfully.
-	 *
-	 * @param Player $source
-	 */
-	abstract public function onExecuteFail(Player $source) : void;
-
+	abstract public function execute(Player $source) : void;
 }

src/pocketmine/inventory/transaction/action/SlotChangeAction.php

@@ -95,33 +95,13 @@ class SlotChangeAction extends InventoryAction{
 	 * Sets the item into the target inventory.
 	 *
 	 * @param Player $source
-	 *
-	 * @return bool
 	 */
-	public function execute(Player $source) : bool{
+	public function execute(Player $source) : void{
 		$this->inventory->setItem($this->inventorySlot, $this->targetItem, false);
-		return true;
-	}
-
-	/**
-	 * Sends slot changes to other viewers of the inventory. This will not send any change back to the source Player.
-	 *
-	 * @param Player $source
-	 */
-	public function onExecuteSuccess(Player $source) : void{
 		foreach($this->inventory->getViewers() as $viewer){
 			if($viewer !== $source){
 				$viewer->getNetworkSession()->syncInventorySlot($this->inventory, $this->inventorySlot);
 			}
 		}
 	}
-
-	/**
-	 * Sends the original slot contents to the source player to revert the action.
-	 *
-	 * @param Player $source
-	 */
-	public function onExecuteFail(Player $source) : void{
-		$source->getNetworkSession()->syncInventorySlot($this->inventory, $this->inventorySlot);
-	}
 }