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Yii2 隊(duì)列 shmilyzxt/yii2-queue 簡單概述

 更新時(shí)間：2017年08月02日 09:45:53   作者：小叮當(dāng)?shù)亩嵌? 
這篇文章主要介紹了Yii2 隊(duì)列 shmilyzxt/yii2-queue 的簡單概述,需要的朋友可以參考下

shmilyzxt/yii2-queue 簡單解釋:

1.我用的yii2高級(jí)版,我們從配置開始看代碼,這里我用的是mysql隊(duì)列,首先配置文件,我把queue配置項(xiàng)寫在根目錄common\config\main-local.php下的 components數(shù)組下,更改一下數(shù)據(jù)庫配置.復(fù)制composer安裝后復(fù)制

vendor\shmilyzxt\yii2-queue\jobs\jobs.sql
vendor\shmilyzxt\yii2-queue\failed\failed.sql

2個(gè)sql文件到數(shù)據(jù)庫中建立隊(duì)列數(shù)據(jù)表和執(zhí)行任務(wù)失敗時(shí)的數(shù)據(jù)表.

2.推送任務(wù)開始語法:\Yii::$app->queue->pushOn(new SendMial(),['email'=>'49783121@qq.com','title'=>'test','content'=>'email test'],'email'); 我們到vendor\shmilyzxt\queue\queues\DatabaseQueue.php去看看代碼,pushOn()方法寫在了DatabaseQueue類的父類vendor\shmilyzxt\queue\base\Queue.php中:

//入隊(duì)列
public function pushOn($job, $data = '', $queue = null)
 {
 //canPush 檢查隊(duì)列是否已達(dá)最大任務(wù)量
 if ($this->canPush()) { 
  //beforePush 入隊(duì)列前的事件
  $this->trigger(self::EVENT_BEFORE_PUSH); 
  //入隊(duì)列
  $ret = $this->push($job, $data, $queue);
  //afterPush 入隊(duì)列后的事件
  $this->trigger(self::EVENT_AFTER_PUSH);
  return $ret;
 } else {
  throw new \Exception("max jobs number exceed! the max jobs number is {$this->maxJob}");
 }
 }

注釋:這里最好去看看yii2 event事件類,http://www.digpage.com/event.html

關(guān)于入隊(duì)列: $this->push($job, $data, $queue);,這里在配合queue類文件查看,相關(guān)函數(shù)跳轉(zhuǎn),處理一下數(shù)據(jù)記錄到數(shù)據(jù)庫中.(函數(shù)走向:getQueue()-->createPayload()-->pushToDatabase()),pushOn()最終返回?cái)?shù)據(jù)插入數(shù)據(jù)庫的結(jié)果,成功$ret是1.

3.后臺(tái)運(yùn)行命令處理隊(duì)列,例:php ./yii worker/listen default 10 128 3 0 其中default是隊(duì)列的名稱,上面推送了一個(gè)email隊(duì)列 應(yīng)該改為email.

啟動(dòng)命令后,我們來看代碼:首先執(zhí)行:WorkerController控制器 actionListen方法,我們跟著代碼進(jìn)入到 vendor\shmilyzxt\queue\Worker.php -- listen方法中,這里其實(shí)就是一直在循環(huán),執(zhí)行操作隊(duì)列的任務(wù):

/**
 * 啟用一個(gè)隊(duì)列后臺(tái)監(jiān)聽任務(wù)
 * @param Queue $queue
 * @param string $queueName 監(jiān)聽隊(duì)列的名稱(在pushon的時(shí)候把任務(wù)推送到哪個(gè)隊(duì)列，則需要監(jiān)聽相應(yīng)的隊(duì)列才能獲取任務(wù))
 * @param int $attempt 隊(duì)列任務(wù)失敗嘗試次數(shù)，0為不限制
 * @param int $memory 允許使用的最大內(nèi)存
 * @param int $sleep 每次檢測的時(shí)間間隔
 */
 public static function listen(Queue $queue, $queueName = 'default', $attempt = 10, $memory = 512, $sleep = 3, $delay = 0){
 while (true){
  try{
  //DatabaseQueue從數(shù)據(jù)庫隊(duì)列取出一個(gè)可用任務(wù)(實(shí)例),并且更新任務(wù)
  $job = $queue->pop($queueName);
  }catch (\Exception $e){
  throw $e;
  continue;
  }
  if($job instanceof Job){
  //判斷執(zhí)行錯(cuò)誤的次數(shù)是否大于傳入的執(zhí)行次數(shù)
  if($attempt > 0 && $job->getAttempts() > $attempt){
   $job->failed();
  }else{
   try{
   //throw new \Exception("test failed");
   $job->execute();
   }catch (\Exception $e){
   //執(zhí)行失敗,判斷是否被刪除,重新入隊(duì)
   if (! $job->isDeleted()) {
    $job->release($delay);
   }
   }
  }
  }else{
  self::sleep($sleep);
  }
  if (self::memoryExceeded($memory)) {
  self::stop();
  }
 }
 }

注釋:在$queue->pop($queueName);是vendor\shmilyzxt\queue\queues\DatabaseQueue.php方法內(nèi)使用事務(wù)執(zhí)行SQL,并且創(chuàng)建vendor\shmilyzxt\queue\jobs\DatabaseJob.php的實(shí)例

 //取出一個(gè)任務(wù)
 public function pop($queue = null)
 {
 $queue = $this->getQueue($queue);
 if (!is_null($this->expire)) {
  //$this->releaseJobsThatHaveBeenReservedTooLong($queue);
 }
 $tran = $this->connector->beginTransaction();
 //判斷是否有一個(gè)可用的任務(wù)需要執(zhí)行
 if ($job = $this->getNextAvailableJob($queue)) {
  $this->markJobAsReserved($job->id);
  $tran->commit();
  $config = array_merge($this->jobEvent, [
  'class' => 'shmilyzxt\queue\jobs\DatabaseJob',
  'queue' => $queue,
  'job' => $job,
  'queueInstance' => $this,
  ]);
  return \Yii::createObject($config);
 }
 $tran->commit();
 return false;
 }

至于:$job->execute();是DatabaseJob繼承父類Job執(zhí)行的,順著代碼找下去是yii\base\Component trigger執(zhí)行的事件,

/**
 * 執(zhí)行任務(wù)
 */
public function execute()
{
 $this->trigger(self::EVENT_BEFORE_EXECUTE, new JobEvent(["job" => $this, 'payload' => $this->getPayload()]));//beforeExecute 執(zhí)行任務(wù)之前的一個(gè)事件 在JobEvent中并沒有什么可執(zhí)行的代碼
 $this->resolveAndFire();//真正執(zhí)行的任務(wù)的方法
}
 /**
 * 真正任務(wù)執(zhí)行方法（調(diào)用hander的handle方法）
 * @param array $payload
 * @return void
 */
 protected function resolveAndFire()
 {
  $payload = $this->getPayload();
  $payload = unserialize($payload); //反序列化數(shù)據(jù)
  $type = $payload['type'];
  $class = $payload['job'];
  if ($type == 'closure' && ($closure = (new Serializer())->unserialize($class[1])) instanceof \Closure) {
   $this->handler = $this->getHander($class[0]);
   $this->handler->closure = $closure;
   $this->handler->handle($this, $payload['data']);
  } else if ($type == 'classMethod') {
   $payload['job'][0]->$payload['job'][1]($this, $payload['data']);
  } else if ($type == 'staticMethod') {
   $payload['job'][0]::$payload['job'][1]($this, $payload['data']);
  } else {//執(zhí)行的`SendMail`類的`handle($job,$data)`方法
   $this->handler = $this->getHander($class);
   $this->handler->handle($this, $payload['data']);
  }
  //執(zhí)行完任務(wù)后刪除
  if (!$this->isDeletedOrReleased()) {
   $this->delete();
  }
 }

最后到了執(zhí)行的SendMail類的handle($job,$data),在這里就是推送到隊(duì)列的對(duì)象和數(shù)據(jù),接著就是我們的處理邏輯了.

public function handle($job,$data)
 {
  if($job->getAttempts() > 3){
   $this->failed($job);
  }
  $payload = $job->getPayload();
  echo '<pre>';print_r($payload);
  //$payload即任務(wù)的數(shù)據(jù)，你拿到任務(wù)數(shù)據(jù)后就可以執(zhí)行發(fā)郵件了
  //TODO 發(fā)郵件
 }

總結(jié)

以上所述是小編給大家介紹的Yii2 隊(duì)列 shmilyzxt/yii2-queue簡介，希望對(duì)大家有所幫助，如果大家有任何疑問請(qǐng)給我留言，小編會(huì)及時(shí)回復(fù)大家的。在此也非常感謝大家對(duì)腳本之家網(wǎng)站的支持！

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