... 消息驱动EJB：Message Driven EJB 消息路由选择：message routing 消息接收方：message receiver ...
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一个策略可能过滤掉它认为不必处理的消息，或者将所有消息选择委托给单独的路由对象。
A policy may filter out all messages that it deems not necessary to process, or delegate all message selection to the individual route objects.
对于这种情况，对每条消息的目标点和路由的选择都发生在运行时。
In this case, the selection of the destination and the routing both occur per-message at run time.
属性映射在消息选择已经在一个路由中发生之后才被应用。
Property Maps are applied after message selection has already occurred within a route.
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