什么是Actor?
Actor對于PHPer來說,可能會(huì)比較陌生,寫過Java的同學(xué)會(huì)比較熟悉,Java一直都有線程的概念(雖然PHP有Pthread,但不普及),它是一種非共享內(nèi)存的并發(fā)模型,每個(gè)Actor內(nèi)的數(shù)據(jù)獨(dú)立存在,Actor之間通過消息傳遞的形式進(jìn)行交互調(diào)度,且Actor是一種高度抽象化的編程模型,非常適合于游戲、硬件行業(yè)。
Swoole協(xié)程與信箱
得益于Swoole4.x,我們可以基于Swoole的協(xié)程與Channel快速實(shí)現(xiàn)一個(gè)信箱模式調(diào)度。模擬代碼如下:
use Swoole/Coroutine/Channel;go(function (){ //創(chuàng)建十個(gè)信箱通道 $mailBoxes = []; for ($i = 1;$i <= 10;$i++){ $mailBoxes[$i] = new Channel(16); } //模擬master 郵局調(diào)度,隨機(jī)像一個(gè)信箱投遞消息 go(function ()use($mailBoxes){ while (1){ /co::sleep(2); $key = rand(1,10); ($mailBoxes[$key])->push(time()); } }); //模擬actor 實(shí)體消費(fèi) for ($i = 1;$i <= 10;$i++){ go(function ()use($mailBoxes,$i){ while (1){ $msg = ($mailBoxes[$i])->pop(); echo "Actor {$i} recv msg : {$msg} /n"; } }); }});以上代碼執(zhí)行輸出:
php test.php
Actor 8 recv msg : 1559622691
Actor 10 recv msg : 1559622693
Actor 1 recv msg : 1559622695
Actor 5 recv msg : 1559622697
協(xié)程通道每次在POP遇到無數(shù)據(jù)的時(shí)候,都會(huì)自動(dòng)讓出執(zhí)行權(quán)(具體可以去看Swoole協(xié)程調(diào)度)
Actor庫
基于上面的原理,我們實(shí)行了一個(gè)多進(jìn)程分布的協(xié)程Actor庫
composer require easyswoole/actor=2.x-dev
我們依賴dev庫進(jìn)行測試,生產(chǎn)可以自己依賴stable版本
進(jìn)程關(guān)系
Easyswoole的Actor模型中,存在兩組進(jìn)程,一組是proxy進(jìn)程,用來實(shí)現(xiàn)Actor對外服務(wù),一組是worker進(jìn)程,proxy進(jìn)程與worker進(jìn)程之間通過unixsock進(jìn)行通訊,而Actor實(shí)例就均勻的分布worker之中。
樣例代碼
比如在一個(gè)聊天室中,我們可以定義一個(gè)房間模型。
namespace EasySwoole/Actor/Test;use EasySwoole/Actor/AbstractActor;use EasySwoole/Actor/ActorConfig;class RoomActor extends AbstractActor{ public static function configure(ActorConfig $actorConfig) { $actorConfig->setActorName('Room'); } public function onStart() { //每當(dāng)一個(gè)RoomActor實(shí)體被創(chuàng)建的時(shí)候,都會(huì)執(zhí)行該回調(diào) var_dump('room actor '.$this->actorId().' start'); } public function onMessage($msg) { //每當(dāng)一個(gè)RoomActor實(shí)體收到外部消息的時(shí)候,都會(huì)執(zhí)行該回調(diào)當(dāng) var_dump('room actor '.$this->actorId().' onmessage: '.$msg); return 'reply at '.time(); } public function onExit($arg) { //每當(dāng)一個(gè)RoomActor實(shí)體退出的時(shí)候,都會(huì)執(zhí)行該回調(diào) var_dump('room actor '.$this->actorId().' exit at arg: '.$arg); return 'exit at '.time(); } protected function onException(/Throwable $throwable) { //每當(dāng)一個(gè)RoomActor出現(xiàn)異常的時(shí)候,都會(huì)執(zhí)行該回調(diào) var_dump($throwable->getMessage()); }}在cli模式下創(chuàng)建一個(gè)Actor服務(wù)
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";}創(chuàng)建一個(gè)cli測試腳本
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'));});以上代碼執(zhí)行結(jié)果如下:
服務(wù)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"
客戶端
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)更多細(xì)節(jié)可以在EasySwoole項(xiàng)目官網(wǎng)得到文檔支持 http://easyswoole.com/
喜歡EasySwoole項(xiàng)目的,可以給個(gè)star https://github.com/easy-swoole/easyswoole
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