Improved threading and resource usage, new defaults

src/pocketmine/scheduler/AsyncPool.php

@@ -0,0 +1,109 @@
+<?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
+
+ *
+ *
+*/
+
+namespace pocketmine\scheduler;
+
+use pocketmine\Server;
+
+class AsyncPool{
+
+	/** @var Server */
+	private $server;
+
+	protected $size;
+
+	/** @var AsyncTask[] */
+	private $tasks = [];
+	/** @var int[] */
+	private $taskWorkers = [];
+
+	/** @var AsyncWorker[] */
+	private $workers = [];
+	/** @var int[] */
+	private $workerUsage = [];
+
+	public function __construct(Server $server, $size){
+		$this->server = $server;
+		$this->size = (int) $size;
+
+		for($i = 0; $i < $this->size; ++$i){
+			$this->workerUsage[$i] = 0;
+			$this->workers[$i] = new AsyncWorker();
+			$this->workers[$i]->start();
+		}
+	}
+
+	public function submitTask(AsyncTask $task){
+		if(isset($this->tasks[$task->getTaskId()]) or $task->isGarbage()){
+			return;
+		}
+
+		$this->tasks[$task->getTaskId()] = $task;
+
+		$selectedWorker = mt_rand(0, $this->size - 1);
+		$selectedTasks = $this->workerUsage[$selectedWorker];
+		for($i = 0; $i < $this->size; ++$i){
+			if($this->workerUsage[$i] < $selectedTasks){
+				$selectedWorker = $i;
+				$selectedTasks = $this->workerUsage[$i];
+			}
+		}
+
+		$this->workers[$selectedWorker]->stack($task);
+		$this->workerUsage[$selectedWorker]++;
+		$this->taskWorkers[$task->getTaskId()] = $selectedWorker;
+	}
+
+	private function removeTask(AsyncTask $task){
+		if(isset($this->taskWorkers[$task->getTaskId()])){
+			$this->workers[$this->taskWorkers[$task->getTaskId()]]->unstack($task);
+		}
+
+		unset($this->tasks[$task->getTaskId()]);
+		unset($this->taskWorkers[$task->getTaskId()]);
+	}
+
+	public function removeTasks(){
+		foreach($this->tasks as $task){
+			$this->removeTask($task);
+		}
+
+		for($i = 0; $i < $this->size; ++$i){
+			$this->workerUsage[$i] = 0;
+		}
+
+		$this->taskWorkers = [];
+		$this->tasks = [];
+	}
+
+	public function collectTasks(){
+		foreach($this->tasks as $task){
+			if($task->isGarbage()){
+
+				$task->onCompletion($this->server);
+
+				$this->workerUsage[$this->taskWorkers[$task->getTaskId()]]--;
+				unset($this->tasks[$task->getTaskId()]);
+				unset($this->taskWorkers[$task->getTaskId()]);
+			}
+		}
+	}
+}