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Are XMPP PubSub notifications broadcasted simultaneously or queue like?

StackOverflow https://stackoverflow.com/questions/1292057
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Question

I want to know whether xmpp publish-subscribe functionality send notifications to all subscribers simultaneously(broadcasts) or sends notifications in a queue i.e. one by one.

I want to know the difference between pub-sub and jaxl class which i am using because the jaxl sends push messages in queue that is one user at a time.

Solution

Depends on the implementation. Bare XEP-0060 PubSub implementation would send separate event notification messages to all subscribers.

However, there are other extensions such as XEP-0033 Extended Stanza Addressing that allows multicast addressing of messages.

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