事件通道将执行调用业务服务和向订阅事件通道的所有侦听程序通知事件成功完成还是未能完成两项任务。
The event channel performs the task of calling the business service and notifying any listeners subscribed to the event channel of the event's successful completion or failure.
然后，选择器把通道和感兴趣的操作复制到内核空间，让内核为这个应用程序执行实际的poll。
The selector then copies the channels and interested operations into the kernel space and let the kernel do the actual polling for the application.
如果找不到，它执行的服务器应用程序，等待着，然后打开了一条通道。
If one could not be found, it executed the Server app, waited and then opened a channel.
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