This method is invoked when the client sends a request to the service the mediation flow is to invoke.

当客户机将一个请求发送到服务时，这个方法将被调用，然后将调用中介流。

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The same method is invoked from the data handler (Figure 2) and from the custom mediation primitive (Figure 3).

从数据处理程序(图2)和自定义中介原语(图3)调用了同样的方法。

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To add basic functionality to your mediation, copy and paste the code in Listing 2 below to the handle method of your mediation.

为了向中介添加基本功能，请将下面清单2中的代码复制并粘贴到中介的handle方法。

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