每个方法都提供了一个回调对象，这样就可以在完成远程过程调用后收到异步通知。

Each method provides a callback object so that you are notified asynchronously when the remote procedure call is complete.

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该文件提供在远程接口中定义的所有方法以及应用服务器所需的方法(例如回调方法)的实现。

This file provides an implementation of all the methods defined in the remote interface, in addition to methods required by the application server (for example, callback methods).

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例如，可以在回调基类中实现错误处理方法，让所有回调都可以使用它，从而确保以一致的方式处理所有远程服务异常。

For example, an error handling method can be implemented in a callback base class so that it can be used by all callbacks to ensure all remote service exceptions will be handled consistently.

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