在运行时，委托将各种调用转发到相应的事件处理程序。

At run time, the delegate forwards calls to the appropriate event handler.

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开发一个PHP模块，它作为REST服务，将调用转发给其他php模块中的业务逻辑。

A PHP module that ACTS as a REST service to front-end the calls to the business logic in the other PHP modules that are part of this scenario.

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这样，当我们接收到一个getMetaData的请求，我们可以把这个调用转发到特定的元数据位置。

Thus, when we receive a request for getMetaData, we can relay the call to a specific metadata location.

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