高性能分布式内存队列系统beanstalkd(转)

beanstalkd一个高性能、轻量级的分布式内存队列系统，最初设计的目的是想通过后台异步执行耗时的任务来降低高容量Web应用系统的页面访问延迟,支持过有9.5 million用户的Facebook Causes应用。后来开源，之后有PostRank大规模部署和使用,每天处理百万级任务.

安装略了PHP客户端可使用pheanstalk. 可以去github上在看

require_once('pheanstalk/pheanstalk_init.php');
$pheanstalk = new Pheanstalk('127.0.0.1:11300');

// Pushing things into the queue
for($i=0; $i<1000; $i++) {   $job = new stdClass();   $job->envelope_id = rand();
  $job->date = date('Y-m-d H:i:s');
  $job_data = json_encode($job);
  $pheanstalk->useTube('test')->put($job_data);
  echo "pushed: " . $job_data . "\n";
}

server.php

class Worker {

  private $path;

  public function __construct($path) {
    $this->setBasePath($path);
    $this->log('starting');
    require_once('pheanstalk/pheanstalk_init.php');
    $this->pheanstalk = new Pheanstalk('127.0.0.1:11300');
  }

  public function __destruct() {
    $this->log('ending');
  }

  private function setBasePath($path) {
    $this->path = $path;
  }

  public function run() {
    $this->log('starting to run');
    $cnt = 0;
    $done_jobs = array();

    while(1) {
      $job = $this->pheanstalk->watch('test')->ignore('default')->reserve();
      $job_encoded = json_decode($job->getData(), false);
      $done_jobs[] = $job_encoded;
      $this->log('job:'.print_r($job_encoded, 1));
      $this->pheanstalk->delete($job);
      $cnt++;

      $memory = memory_get_usage();

      $this->log('memory:' . $memory);

      if($memory > 1000000) {
        $this->log('exiting run due to memory limit');
        exit;
      }

      usleep(10);
    }
  }

  private function log($txt) {
    file_put_contents($this->path . '/log/worker.txt', $txt . "\n", FILE_APPEND);
  }
}

Picking up things from the queue
$worker = new Worker(dirname($argv[0]));
$worker->run();

注:
1)可使用supervisor或deamontools等将php worker.php变为守护进程.
2)其它语言类库参考

worker端不一定用php来写,可以用Python 或是 nodejs ,go写,都比PHP强