每个使用登录服务的组件都必须等待直到服务通知收到了登录消息。
Every component that used the logging service had to wait until the service acknowledged receipt of the log message.
客户机代码将轮询输出队列以获得响应，或等待响应消息交付时的回调通知。
The client code would either poll the output queue for the response or wait for some kind of call-back notification when the response message has been delivered.
Feed订阅者再也不用反复等待更新通知ping结果和Atom URL轮询了，他们可以从主站中枢那里收到通知和消息更新。
Rather than waiting on the back and forth pings of update notifications and polled Atom URLs, feed subscribers can receive both the notification and the message from a hub.
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