Subscribes with the broker to receive StateChange notifications.

向代理程序订阅以收到StateChange通知消息。

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Sensor — This performs the monitoring of the log file and publishes a StateChange topic with the broker, every time a new state change entry is added to the log file.

Sensor——它执行对日志文件的监视，并且，每当添加一条新的状态改变条目到日志文件中，便利用Broker(代理)发布一个StateChange主题。

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If the corresponding stop button is then pressed a StateChange notification is generated and a Restart action is invoked to get the application back to the running state, as discussed previously.

如果按下相应的停止按钮，会产生一个StateChange通知消息，并且会调用一个Restart动作，将应用程序恢复到运行状态，这一点在前面已经讲到了。

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