How to implement callback?

Hi all!
I want to use asynchronous callback between two JBI components.How to implement it using EPR?If EPR is used,must I use WS-Addressing and SOAP message?
In addition,can another alternative way do it in JBI's message lay?For example,in CORBA,we may send client's ReplyHandler reference to server, so server's response will be delivery to client's ReplyHandler object by ORB.
thanks!
Spliu

The simplest way to implement asynch callback is to use the properties of the MessageExchange instance. Simply attach the callback object to the message exchange instance, and send the instance off to be processed. When the component receives the response in the MessageExchange instance, it can simply retrieve the callback object and invoke it with the response.
Using EPRs is more difficult, for it requires that both components agree on how such references are passed between them. Any EPR vocabulary (eg, WS-Addressing) can be used; generally only one component "understands" the EPR vocabulary (usually a binding component); the other treats it as an opaque XML fragment that it passes to JBI in exchange for an EndpointReference.

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