关于Laravel队列的实现原理以及如何解决问题

// 将一任务推入队列中
public function pushRaw($payload, $queue = null, array $options = [])
  {
    $this->getConnection()->rpush($this->getQueue($queue), $payload);

    return Arr::get(json_decode($payload, true), 'id');
  }

protected function getQueue($queue)
  {
    return 'queues:'.($queue ?: $this->default);
  }

// config\queue.php 文件中的redis配置部分
'redis' => [
      'driver'   => 'redis',
      'connection' => 'default',
      'queue'   => 'default',
      'expire'   => 60,
    ],

protected function getNextJob($connection, $queue)
  {
    if (is_null($queue)) {
      return $connection->pop();
    }

    foreach (explode(',', $queue) as $queue) {
      if (! is_null($job = $connection->pop($queue))) {
        return $job;
      }
    }
  }

// Illuminate\Queue\RedisQueue.php
public function pop($queue = null)
  {
    $original = $queue ?: $this->default;

    $queue = $this->getQueue($queue);

    if (! is_null($this->expire)) {
      $this->migrateAllExpiredJobs($queue);
    }

    $job = $this->getConnection()->lpop($queue);

    if (! is_null($job)) {
      $this->getConnection()->zadd($queue.':reserved', $this->getTime() + $this->expire, $job);

      return new RedisJob($this->container, $this, $job, $original);
    }
  }