phprs\util\MessagePump::run PHP Method

    public function run()
    {
        if ($this->is_running) {
            return;
        }
        Logger::debug("[MQ Pump] begin");
        $this->is_running = true;
        while (count($this->next_action) || count($this->next_idle)) {
            //没有活动事件,执行idle事件
            if (count($this->next_action) === 0) {
                $queue_id = array_pop($this->next_idle);
                if (!isset($this->idle_queues[$queue_id])) {
                    // 队列可能被关闭
                    continue;
                }
                $idle = array_pop($this->idle_queues[$queue_id]);
                Verify::isTrue($idle !== null, 'never been here!!');
                if ($idle[2] !== null) {
                    try {
                        call_user_func_array($idle[0], $idle[1]);
                    } catch (\Exception $e) {
                        $idle[2]($e);
                    }
                } else {
                    call_user_func_array($idle[0], $idle[1]);
                }
                continue;
            }
            $queue_id = array_pop($this->next_action);
            if (!isset($this->action_queues[$queue_id])) {
                // 队列可能被关闭
                continue;
            }
            $actions =& $this->action_queues[$queue_id];
            $left = count($actions);
            $action = array_pop($actions);
            if ($action !== null) {
                $this->callAction($queue_id, $action);
            } elseif ($left !== 0) {
                //null插入队列,表示执行队列结束, 可以安全关闭队列了
                $onend = $this->end_handles[$queue_id];
                unset($this->action_queues[$queue_id]);
                unset($this->idle_queues[$queue_id]);
                unset($this->end_handles[$queue_id]);
                Logger::debug("[MQ {$queue_id}] closed");
                if ($onend !== null) {
                    $onend();
                }
            }
        }
        //不是在单个队列为空时将其关闭,因为对于存在子流程的时候,其消息队列可能为空,但
        //其他流程执行可能导致子流程产生活动消息,所以不能在队列为空时就关闭队列
        foreach ($this->end_handles as $onend) {
            if ($onend !== null) {
                $onend();
            }
        }
        $this->next_action = array();
        $this->next_idle = array();
        $this->action_queues = array();
        $this->idle_queues = array();
        $this->end_handles = array();
        $this->is_running = false;
        Logger::debug("[MQ Pump] end");
    }