The Service Registry provides validation and notification interfaces, which allows you to write custom validation and notification code.
Service Registry提供允许编写自定义验证和通知代码的验证和通知接口。
Listing 4 shows a typical messaging event, posting notification of a new high bid in an auction system, and the code that generates it.
清单4显示了一个典型的消息传递事件，即发布拍卖系统中的一个新的高投标通知和产生该事件的代码。
Alerts provide notification that new code is available, and updates are installed with a click of the mouse.
警报会发出新代码已可用的通知，只需单击鼠标就能安装更新。
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