Messaging Middleware
Messaging Middleware:
A messaging server is a middleware program that handles messages that are sent for use by other programs using a messaging application program interface (API). A messaging server can usually queue and prioritize messages as needed and saves each of the client programs from having to perform these services. Messaging and messaging servers usually are organized in one or both of two models: point-to-point messaging and subscribe/publish messaging.
From: http://searchwinit.techtarget.com/gDefinition/0,294236,sid1_gci214556,00.html
DJabberd
DJabberd is a high-performance, scalable, extensible Jabber/XMPP server framework. While it comes with an example server, it's really a set of classes for you to build your own Jabber server without understanding Jabber. Instead of working with XML and protocol-specific details, you subclass parts and work with sane objects and data structures and let DJabberd do all the ugly work.
Consider DJabberd the mod_perl/qpsmtpd/Perlbal/Plagger of the XMPP world. Everything is a plugin. The framework lets you override the behavior of:
Authentication
Authorization
Roster Storage
Automatic roster population
Presence lookup
Message delivery
Internode communication
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DJabberd
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