Object Brokers
Object Broker:
Object Broker is a middleware that takes care of all of the details involved in routing a request from client to object, and routing the response to its destination.
XmlBlaster
XmlBlaster is MOM (Message oriented Middleware) with a lot of features.
XmlBlaster is a publish/subscribe and point to point 100% Java based MOM server (message-oriented middleware) which exchanges messages between publishers and subscribers. The message is described with XML-encoded meta information. Messages may contain everything, GIF images, Java objects, Python scripts, XML data, a word document, plain text - just anything.
Communication with the server is based on socket, CORBA (using JacORB), RMI, XmlRpc, HTTP or email, clients are free to choose their preferred protocol. Other protocols like SOAP may be plugged in.
Subscribers can use XPath expressions to filter the messages they wish to receive.
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XmlBlaster
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