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Subject: NEW ISSUE: Clarify the rules on which queues are used for responses andcallbacks

Target: JMS binding

Description: The JMS binding spec currently doesn't say how the response and callback element definitions relate to messages that are sent from a reference, and those sent by a service, and what the precedence of the message's replyTo and scaCallbackQueue are relative to the SCDL definitions.


Messages sent from a JMS reference with a response queue have the JMS replyTo queue set to the response queue name.
For messages received by a service, by default the replyTo, if present, overrides any defined response element.
If scaCallbackQueue is present in a message, the callback binding destination is ignored.
Clarify that in the callback/conversation section that the use of replyTo and service callback queue are there for interacting with non-SCA applications

Possible additional updates that relate to these:

Add "overrideReplyTo={true|false}" attribute to the <response> element for a service indicating always use vs. only use if no replyTo specified in a given received message - false is the default).  

Add "overrideCallbackQueue="{true|false}" attribute to <binding.jms>, which applies when the binding is used on a service callback, to indicate whether the service callback queue is always used or only when no replyTo and scaCallbackQueue in a received request message.

Add "useForCallback="{true|false}" attribute to the <response> element for a reference that inficates that callbacks should go to the replyTo queue without having to duplicate the definition in a callback service binding.

Simon Holdsworth

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