采用这种方式配置的计时器尽可能等待服务作出响应。
Timers configured in this manner give the service every opportunity to respond.
所有线程已启动后，将等待30秒再启动计时器。
After all of the threads are started, plus a 30 second wait, the timer is started.
它与计时器解决方案的主要差异是命令排队等待，如果必须把处理发送回队列等待下一次运行，那么execute方法返回True。
The main differences with the timer solution are that commands are queued and the execute method returns True if the process must be sent back to the queue for another round.
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