中介将从一个目标文件的调解之前部分发送消息。
The mediation will be delivered messages from the pre-mediated part of a destination.
一旦被处理，假设消息没有改变方向或被消费，消息被放置在调解之后部分。
Once processed, and assuming the message is not redirected or consumed, the message is placed on the post-mediated part.
通过代理的消息路由和调解。
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