如果未在缓存中发现这样的项，则会将请求转发到服务提供者，服务提供者将随后返回路由回消息请求者的响应。
If it does not find such items within the cache, it will forward the request to the service provider which will, in turn, return a response that is routed back to the message requester.
每条消息连同异步回调侦听程序一起被发布到驻留在业务层的消息总线。
Each message is published, along with an asynchronous callback listener, to a message bus residing on the business tier.
样例服务对您给予的消息作出回显，但这种回显是反向的。
The sample service echoes the message that you give it, but backwards.
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