xml 配置如何指定某个方法为广播模式

如下xml配置 WebServerRemoteService 中有个刷新refresh 缓存数据的方法,我想广播到每台机器,但是WebServerRemoteService 有其他非广播方法,在使用xml配置的情况下如何配置单方法的广播
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Begin with the two XML entries for MessageService and WebServerRemoteService, then inspect Dubbo's XML reference configuration and method-level broadcast handling. Done means confirming whether refresh can be broadcast independently of the other methods and documenting the applicable configuration.

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