欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  IT编程

PHP下用Swoole实现Actor并发模型的方法

程序员文章站 2022-08-27 22:16:02
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...

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:

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

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。

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

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

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

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

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

喜欢easyswoole项目的,可以给个star

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。