基于Redis 的任务队列Bull -- （三）多个客户端

bull在创建队列时会创建三个redis客户端，分别用于不同的任务

Object.defineProperties(this, {
    // Queue client (used to add jobs, pause queues, etc);
    client: {
      get: lazyClient('client')
    },
    // Event subscriber client (receive messages from other instance of the queue)
    eclient: {
      get: lazyClient('subscriber')
    },
    bclient: {
      get: lazyClient('bclient')
    }
});

client

client是最常用的客户端，用于添加任务 / 获取任务锁 / 移动任务状态等等

client.addJob(keys)

queue.client.takeLock([
   job.lockKey(),
   queue.token,
   queue.settings.lockDuration
]);

queue.client.moveToActive(keys.concat(args)).then(raw2jobData);
job.queue.client.moveT