I am starting a new design thread here, to separate it from the Remoting issue that sparkled it (http://jira.jboss.com/jira/browse/JBREM-93):
anonymous wrote :
| Use case:
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| I am using a push callback to synchronously deliver a message to a JMS Client (MessageConsumer). My server-side consumer endpoint receives the message from the messaging core and synchronously invokes callbackHandler.handleCallback(...). The server-side thread is blocked until the push either succeeds or fails.
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| This invocation eventually reaches my callback handler on the client-side. However, the callback handler should be able to refuse the message: for example, nobody is blocked in a receive() and there is no message listener. There should be a way to politely say: yes, I have seen your message, but I don't need it and I don't want it, and here's my NACK.
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| With the current InvokerCallbackHandler.handleCallback() signature (public void handleCallback(InvocationRequest invocation) throws HandleCallbackException), the only way for the callback handler to send a NACK is to throw a HandleCallbackException
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