PHP实现简单的协程任务调度demo示例

165 阅读 0 评论 109 点赞

我是靠谱客的博主调皮毛巾，最近开发中收集的这篇文章主要介绍PHP实现简单的协程任务调度demo示例，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

本文实例讲述了PHP实现简单的协程任务调度。分享给大家供大家参考，具体如下：

<?php
class Task
{
  protected $taskId;
  protected $coroutine;
  protected $sendValue = null;
  protected $beforeFirstYield = true;
  public function __construct($taskId, Generator $coroutine)
  {
    $this->taskId = $taskId;
    $this->coroutine = $coroutine;
  }
  public function getTaskId()
  {
    return $this->taskId;
  }
  public function setSendValue($sendValue)
  {
    $this->sendValue = $sendValue;
  }
  public function run()
  {
    if ($this->beforeFirstYield) {
      $this->beforeFirstYield = false;
      return $this->coroutine->current();
    } else {
      $retval = $this->coroutine->send($this->sendValue);
      $this->sendValue = null;
      return $retval;
    }
  }
  public function isFinished()
  {
    return !$this->coroutine->valid();
  }
}
class Scheduler
{
  protected $maxTaskId = 0;
  protected $taskMap = []; // taskId => task
  protected $taskQueue;
  public function __construct()
  {
    $this->taskQueue = new SplQueue();
  }
  public function newTask(Generator $coroutine)
  {
    $tid = ++$this->maxTaskId;
    $task = new Task($tid, $coroutine);
    $this->taskMap[$tid] = $task;
    $this->schedule($task);
    return $tid;
  }
  public function schedule(Task $task)
  {
    $this->taskQueue->enqueue($task);
  }
  public function run()
  {
    while (!$this->taskQueue->isEmpty()) {
      $task = $this->taskQueue->dequeue();
      $task->run();
      if ($task->isFinished()) {
        unset($this->taskMap[$task->getTaskId()]);
      } else {
        $this->schedule($task);
      }
    }
  }
}
function task1()
{
  for ($i = 1; $i <= 10; ++$i) {
    echo "This is task 1 iteration $i.n";
    sleep(1);
    yield;
  }
}
function task2()
{
  for ($i = 1; $i <= 10; ++$i) {
    echo "This is task 2 iteration $i.n";
    sleep(1);
    yield;
  }
}
$scheduler = new Scheduler;
$scheduler->newTask(task1());
$scheduler->newTask(task2());
$scheduler->run();

运行结果：

This is task 1 iteration 1.
This is task 1 iteration 2.
This is task 1 iteration 3.
This is task 1 iteration 4.
This is task 1 iteration 5.
This is task 1 iteration 6.
This is task 1 iteration 7.
This is task 1 iteration 8.
This is task 1 iteration 9.
This is task 1 iteration 10.

更多关于PHP相关内容感兴趣的读者可查看本站专题：《PHP进程与线程操作技巧总结》、《PHP网络编程技巧总结》、《PHP基本语法入门教程》、《PHP数组(Array)操作技巧大全》、《php字符串(string)用法总结》、《php+mysql数据库操作入门教程》及《php常见数据库操作技巧汇总》

希望本文所述对大家PHP程序设计有所帮助。