Method push

lib/realtime/processQueue.js:72–84

* pushWithKey a promisify-task to queue * @param id {string} * @param processingFunc {Function } * @returns {boolean} if success return true, otherwise false

(id, processingFunc)

   * @returns {boolean} if success return true, otherwise false
   */
  push (id, processingFunc) {
    if (this.queue.length >= this.max) return false
    if (this.checkTaskIsInQueue(id)) return false
    const task = {
      id: id,
      processingFunc: processingFunc
    }
    this.taskMap.set(id, true)
    this.queue.push(task)
    this.start()
    this.emit(QueueEvent.Push)
    return true
  }

  process () {
    if (this.queue.length <= 0) {