SleeperHandler.php

<?php
 
/*
 * This file is part of Snooze <https://github.com/pmmp/Snooze>
 * Copyright (c) 2018-2023 PMMP Team
 *
 * Snooze 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.
 */
 
declare(strict_types=1);
 
namespace pocketmine\snooze;
 
use pmmp\thread\ThreadSafeArray;
use function count;
use function microtime;
 
class SleeperHandler{
    private readonly ThreadSafeArray $sharedObject;
 
    private array $handlers = [];
 
    private int $nextSleeperId = 0;
 
    public function __construct(){
        $this->sharedObject = new ThreadSafeArray();
    }
 
    public function addNotifier(\Closure $handler) : SleeperHandlerEntry{
        $id = $this->nextSleeperId++;
        $notifier = new SleeperHandlerEntry($this->sharedObject, $id);
        $this->handlers[$id] = $handler;
        return $notifier;
    }
 
    public function removeNotifier(int $notifierId) : void{
        unset($this->handlers[$notifierId]);
    }
 
    private function sleep(int $timeout) : void{
        $this->sharedObject->synchronized(function() use ($timeout) : void{
            if($this->sharedObject->count() === 0){
                $this->sharedObject->wait($timeout);
            }
        });
    }
 
    public function sleepUntil(float $unixTime) : void{
        while(true){
            $this->processNotifications();
 
            $sleepTime = (int) (($unixTime - microtime(true)) * 1000000);
            if($sleepTime > 0){
                $this->sleep($sleepTime);
            }else{
                break;
            }
        }
    }
 
    public function sleepUntilNotification() : void{
        $this->sleep(0);
        $this->processNotifications();
    }
 
    public function processNotifications() : void{
        while(true){
            $notifierIds = $this->sharedObject->synchronized(function() : array{
                $notifierIds = [];
                foreach($this->sharedObject as $notifierId => $_){
                    $notifierIds[$notifierId] = $notifierId;
                    unset($this->sharedObject[$notifierId]);
                }
                return $notifierIds;
            });
            if(count($notifierIds) === 0){
                break;
            }
            foreach($notifierIds as $notifierId){
                if(!isset($this->handlers[$notifierId])){
                    //a previously-removed notifier might still be sending notifications; ignore them
                    continue;
                }
                $this->handlers[$notifierId]();
            }
        }
    }
}