现在只能查看添加已经在第三方注册的朋友。
Now you can only view and add friends who are already signed up to that service.
采用的方法是由第三方注册中心维护一个已知服务提供者的数据库。
The idea is that some third-party registry maintains a database of known service providers.
但如果您希望提供通知支持—使第三方能够使用POJO注册并在变更属性时接收回调，事情会怎样？
But what if you wanted to provide notification support - such that third parties could register with a POJO and receive callbacks when a property changes?
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