Implemented a proper way to handle items cooldown

src/item/ChorusFruit.php

@@ -88,4 +88,8 @@ public function onConsume(Living $consumer) : void{
 	public function getCooldownTicks() : int{
 		return 20;
 	}
+
+	public function getCooldownTag() : ?string{
+		return ItemCooldownTags::CHORUS_FRUIT;
+	}
 }

src/item/EnderPearl.php

@@ -45,4 +45,8 @@ public function getThrowForce() : float{
 	public function getCooldownTicks() : int{
 		return 20;
 	}
+
+	public function getCooldownTag() : ?string{
+		return ItemCooldownTags::ENDER_PEARL;
+	}
 }

src/item/Item.php

@@ -654,6 +654,20 @@ public function getCooldownTicks() : int{
 		return 0;
 	}
 
+	/**
+	 * Returns a tag that identifies a group of items that should have cooldown at the same time
+	 * regardless of their state or type.
+	 * When cooldown starts, any other items with the same cooldown tag can't be used until the cooldown expires.
+	 * Such behaviour can be seen in goat horns and shields.
+	 *
+	 * If tag is null, item state id will be used to store cooldown.
+	 *
+	 * @see ItemCooldownTags
+	 */
+	public function getCooldownTag() : ?string{
+		return null;
+	}
+
 	/**
 	 * Compares an Item to this Item and check if they match.
 	 *

src/item/ItemCooldownTags.php

@@ -0,0 +1,45 @@
+<?php
+
+/*
+ *
+ *  ____            _        _   __  __ _                  __  __ ____
+ * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
+ * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
+ * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
+ * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * @author PocketMine Team
+ * @link http://www.pocketmine.net/
+ *
+ *
+ */
+
+declare(strict_types=1);
+
+namespace pocketmine\item;
+
+/**
+ * Tags used by items to determine their cooldown group.
+ *
+ * These tag values are not related to Minecraft internal IDs.
+ * They only share a visual similarity because these are the most obvious values to use.
+ * Any arbitrary string can be used.
+ *
+ * @see Item::getCooldownTag()
+ */
+final class ItemCooldownTags{
+
+	private function __construct(){
+		//NOOP
+	}
+
+	public const CHORUS_FRUIT = "chorus_fruit";
+	public const ENDER_PEARL = "ender_pearl";
+	public const SHIELD = "shield";
+	public const GOAT_HORN = "goat_horn";
+}

src/network/mcpe/NetworkSession.php

@@ -30,6 +30,7 @@
 use pocketmine\event\server\DataPacketReceiveEvent;
 use pocketmine\event\server\DataPacketSendEvent;
 use pocketmine\form\Form;
+use pocketmine\item\Item;
 use pocketmine\lang\KnownTranslationFactory;
 use pocketmine\lang\Translatable;
 use pocketmine\math\Vector3;
@@ -65,6 +66,7 @@
 use pocketmine\network\mcpe\protocol\PacketDecodeException;
 use pocketmine\network\mcpe\protocol\PacketPool;
 use pocketmine\network\mcpe\protocol\PlayerListPacket;
+use pocketmine\network\mcpe\protocol\PlayerStartItemCooldownPacket;
 use pocketmine\network\mcpe\protocol\PlayStatusPacket;
 use pocketmine\network\mcpe\protocol\ProtocolInfo;
 use pocketmine\network\mcpe\protocol\serializer\PacketBatch;
@@ -111,6 +113,7 @@
 use pocketmine\utils\BinaryStream;
 use pocketmine\utils\ObjectSet;
 use pocketmine\utils\TextFormat;
+use pocketmine\world\format\io\GlobalItemDataHandlers;
 use pocketmine\world\Position;
 use pocketmine\YmlServerProperties;
 use function array_map;
@@ -1289,6 +1292,13 @@ public function onOpenSignEditor(Vector3 $signPosition, bool $frontSide) : void{
 		$this->sendDataPacket(OpenSignPacket::create(BlockPosition::fromVector3($signPosition), $frontSide));
 	}
 
+	public function onItemCooldownChanged(Item $item, int $ticks) : void{
+		$this->sendDataPacket(PlayerStartItemCooldownPacket::create(
+			GlobalItemDataHandlers::getSerializer()->serializeType($item)->getName(),
+			$ticks
+		));
+	}
+
 	public function tick() : void{
 		if(!$this->isConnected()){
 			$this->dispose();

src/player/Player.php

@@ -283,7 +283,11 @@ public static function isValidUserName(?string $name) : bool{
 	protected string $locale = "en_US";
 
 	protected int $startAction = -1;
-	/** @var int[] ID => ticks map */
+
+	/**
+	 * @phpstan-var array<int|string, int>
+	 * @var int[] stateId|cooldownTag => ticks map
+	 */
 	protected array $usedItemsCooldown = [];
 
 	private int $lastEmoteTick = 0;
@@ -697,15 +701,15 @@ public function getItemUseDuration() : int{
 	 */
 	public function getItemCooldownExpiry(Item $item) : int{
 		$this->checkItemCooldowns();
-		return $this->usedItemsCooldown[$item->getStateId()] ?? 0;
+		return $this->usedItemsCooldown[$item->getCooldownTag() ?? $item->getStateId()] ?? 0;
 	}
 
 	/**
 	 * Returns whether the player has a cooldown period left before it can use the given item again.
 	 */
 	public function hasItemCooldown(Item $item) : bool{
 		$this->checkItemCooldowns();
-		return isset($this->usedItemsCooldown[$item->getStateId()]);
+		return isset($this->usedItemsCooldown[$item->getCooldownTag() ?? $item->getStateId()]);
 	}
 
 	/**
@@ -714,7 +718,8 @@ public function hasItemCooldown(Item $item) : bool{
 	public function resetItemCooldown(Item $item, ?int $ticks = null) : void{
 		$ticks = $ticks ?? $item->getCooldownTicks();
 		if($ticks > 0){
-			$this->usedItemsCooldown[$item->getStateId()] = $this->server->getTick() + $ticks;
+			$this->usedItemsCooldown[$item->getCooldownTag() ?? $item->getStateId()] = $this->server->getTick() + $ticks;
+			$this->getNetworkSession()->onItemCooldownChanged($item, $ticks);
 		}
 	}