什么是Actor？
Actor对于PHPer来说，可能会比较陌生，写过Java的同学会比较熟悉，Java一直都有线程的概念（虽然PHP有Pthread,但不普及）,它是一种非共享内存的并发模型，每个Actor内的数据独立存在，Actor之间通过消息传递的形式进行交互调度，且Actor是一种高度抽象化的编程模型，非常适合于游戏、硬件行业。
Swoole协程与信箱
得益于Swoole4.x，我们可以基于Swoole的协程与Channel快速实现一个信箱模式调度。模拟代码如下：
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use Swoole\Coroutine\Channel;go(function (){ //创建十个信箱通道 $mailBoxes = []; for ($i = 1;$i <= 10;$i++){ $mailBoxes[$i] = new Channel(16); } //模拟master 邮局调度,随机像一个信箱投递消息 go(function ()use($mailBoxes){ while (1){ \co::sleep(2); $key = rand(1,10); ($mailBoxes[$key])->push(time()); } }); //模拟actor 实体消费 for ($i = 1;$i <= 10;$i++){ go(function ()use($mailBoxes,$i){ while (1){ $msg = ($mailBoxes[$i])->pop(); echo "Actor {$i} recv msg : {$msg} \n"; } }); }}); |
以上代码执行输出：
php test.php
Actor 8 recv msg : 1559622691
Actor 10 recv msg : 1559622693
Actor 1 recv msg : 1559622695
Actor 5 recv msg : 1559622697
协程通道每次在POP遇到无数据的时候，都会自动让出执行权（具体可以去看Swoole协程调度）
Actor库
基于上面的原理，我们实行了一个多进程分布的协程Actor库
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composer require easyswoole/actor=2.x-dev |
我们依赖dev库进行测试，生产可以自己依赖stable版本
进程关系
Easyswoole的Actor模型中，存在两组进程，一组是proxy进程，用来实现Actor对外服务，一组是worker进程，proxy进程与worker进程之间通过unixsock进行通讯，而Actor实例就均匀的分布worker之中。
样例代码
比如在一个聊天室中，我们可以定义一个房间模型。
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namespace EasySwoole\Actor\Test;use EasySwoole\Actor\AbstractActor;use EasySwoole\Actor\ActorConfig;class RoomActor extends AbstractActor{ public static function configure(ActorConfig $actorConfig) { $actorConfig->setActorName('Room'); } public function onStart() { //每当一个RoomActor实体被创建的时候，都会执行该回调 var_dump('room actor '.$this->actorId().' start'); } public function onMessage($msg) { //每当一个RoomActor实体收到外部消息的时候，都会执行该回调当 var_dump('room actor '.$this->actorId().' onmessage: '.$msg); return 'reply at '.time(); } public function onExit($arg) { //每当一个RoomActor实体退出的时候，都会执行该回调 var_dump('room actor '.$this->actorId().' exit at arg: '.$arg); return 'exit at '.time(); } protected function onException(\Throwable $throwable) { //每当一个RoomActor出现异常的时候，都会执行该回调 var_dump($throwable->getMessage()); }} |
在cli模式下创建一个Actor服务
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use EasySwoole\Actor\Actor;use EasySwoole\Actor\Test\RoomActor;use EasySwoole\Actor\ProxyProcess;Actor::getInstance()->register(RoomActor::class);$list = Actor::getInstance()->generateProcess();foreach ($list['proxy'] as $proxy){ /** @var ProxyProcess $proxy */ $proxy->getProcess()->start();}foreach ($list['worker'] as $actors){ foreach ($actors as $actorProcess){ /** @var ProxyProcess $actorProcess */ $actorProcess->getProcess()->start(); }}while($ret = \Swoole\Process::wait()) { echo "PID={$ret['pid']}\n";} |
创建一个cli测试脚本
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use EasySwoole\Actor\Actor;use EasySwoole\Actor\Test\RoomActor;Actor::getInstance()->register(RoomActor::class);go(function (){ $actorId = RoomActor::client()->create('create arg1'); var_dump($actorId); \co::sleep(3); var_dump(RoomActor::client()->send($actorId,'this is msg')); \co::sleep(3); var_dump(RoomActor::client()->exit($actorId,'this is exit arg')); \co::sleep(3); RoomActor::client()->create('create arg2'); \co::sleep(3); RoomActor::client()->create('create arg3'); \co::sleep(3); var_dump(RoomActor::client()->sendAll('sendAll msg')); \co::sleep(3); var_dump(RoomActor::client()->status()); \co::sleep(3); var_dump(RoomActor::client()->exitAll('sendAll exit'));}); |
以上代码执行结果如下：
服务端
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php test.php string(40) "room actor 00101000000000000000001 start"string(57) "room actor 00101000000000000000001 onmessage: this is msg"string(64) "room actor 00101000000000000000001 exit at arg: this is exit arg"string(40) "room actor 00101000000000000000002 start"string(40) "room actor 00103000000000000000001 start"string(57) "room actor 00101000000000000000002 onmessage: sendAll msg"string(57) "room actor 00103000000000000000001 onmessage: sendAll msg"string(60) "room actor 00101000000000000000002 exit at arg: sendAll exit"string(60) "room actor 00103000000000000000001 exit at arg: sendAll exit" |
客户端
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php test2.php string(23) "00101000000000000000001"string(19) "reply at 1559623925"string(18) "exit at 1559623928"bool(true)array(3) { [1]=> int(1) [2]=> int(0) [3]=> int(1)}bool(true) |
更多细节可以在EasySwoole项目官网得到文档支持 http://easyswoole.com/
喜欢EasySwoole项目的，可以给个star https://github.com/easy-swoole/easyswoole
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://segmentfault.com/a/1190000019382531
