How works Exactly Once delivery for Pub/Sub?

Hello
For example there is the following system landscape:
JMSServer, Sender, Receiver1, Receiver2
All clients uses the same topic.
Sender sends Message1 to Topic on JMSServer. Receiver1 connects and receives Message1. Then Receiver1 disconnects.
After that Sender sends Message2 to the same topic.
In this case Receiver1 must receive Message2 only and Receiver 2 must receive Message1 and Message2.
How does JMS Server determine that Receiver1 has received Message1 alrady?

Now I understand.
JMS will maintain the order messages are published from each client so you will get this behaviour for free, with the caveats specified on page 66 of the JMS Spec 1.1
http://java.sun.com/products/jms/docs.html
Also if your JMS Server is clustered the message order will probably go out the window.
You may want to set your messages (or topic if your JMS provider permits it) to be non-expiring.

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