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.
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希望本文所述对大家PHP程序设计有所帮助。