如清单10所示，当e JB客户机调用远程或本地接口时，它必须传递RequestContext对象，这个对象包含关于当前范围的信息。
As shown in Listing 10, when the EJB client calls the remote or local interface, it must pass the RequestContext object, which contains information about current scopes.
AccountValue——是一个传递对象，这个对象表示从Account实体bean远程接口获取的帐号信息。
AccountValue — a transfer object that represents account information obtained from the account entity bean remote interface.
当接口映射调用业务对象映射时，将会传递 Relationship Service 所必需的信息，以确定其调用上下文。
When the interface maps invoke the business object maps, they pass the information that is necessary for the Relationship Service to determine the context in which it is invoked.
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