Event.php

<?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\event;
 
use pocketmine\timings\Timings;
use function count;
use function get_class;
 
abstract class Event{
    private const MAX_EVENT_CALL_DEPTH = 50;
 
    private static int $eventCallDepth = 1;
 
    protected ?string $eventName = null;
 
    final public function getEventName() : string{
        return $this->eventName ?? get_class($this);
    }
 
    public function call() : void{
        if(self::$eventCallDepth >= self::MAX_EVENT_CALL_DEPTH){
            //this exception will be caught by the parent event call if all else fails
            throw new \RuntimeException("Recursive event call detected (reached max depth of " . self::MAX_EVENT_CALL_DEPTH . " calls)");
        }
 
        $timings = Timings::getEventTimings($this);
        $timings->startTiming();
 
        $handlers = HandlerListManager::global()->getHandlersFor(static::class);
 
        ++self::$eventCallDepth;
        try{
            foreach($handlers as $registration){
                $registration->callEvent($this);
            }
        }finally{
            --self::$eventCallDepth;
            $timings->stopTiming();
        }
    }
 
    public static function hasHandlers() : bool{
        return count(HandlerListManager::global()->getHandlersFor(static::class)) > 0;
    }
}