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497

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Can XMPP be applied in a similar way to the reverse Ajax pattern? Can it be used to implement http long wait like Comet? Is there an example of using such a technique with XMPP?

+5  A: 

Yes. Take a look at XMPP over BOSH. It's a long-lived non-polling technique. From the BOSH specification:

This specification defines a transport protocol that emulates the semantics of a long-lived, bidirectional TCP connection between two entities (such as a client and a server) by efficiently using multiple synchronous HTTP request/response pairs without requiring the use of frequent polling or chunked responses.

jbosh is an open source Java implementation. Tigase.org has a number of projects, including BOSH support, and appears to be mostly Java/GWT. JAXMPP is a Java library in the framework, although it's not clear what feature set it supports. I've not tried any of these myself.

ire_and_curses
any demo app in java?
cometta
@cometta: I've added Java links to the revised answer.
ire_and_curses
can you comment on benefit of using xmpp bosh approach compared with comet ? which stand out better?
cometta
@cometta: I think that is a detailed enough discussion to require its own question.
ire_and_curses
A: 
Alfred