codaland
Tuesday, March 18, 2003
       
o:XML - the object oriented XML programming language
o:XML is a complete object oriented programming language, with features such as multiple inheritance, function overloading, recursive procedures, and much more. The syntax is straight-forward, intuitive XML. Since o:XML programs are in the same format as your XML data, object-oriented paradigms can be leveraged to the maximum, while the data remains in a standard format for powerful XML processing.
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Monday, March 17, 2003
       
The Spread Toolkit
Spread is a toolkit that provides a high performance messaging service that is resilient to faults across external or internal networks. Spread functions as a unified message bus for distributed applications, and provides highly tuned application-level multicast and group communication support. Spread services range from reliable message passing to fully ordered messages with delivery guarantees, even in case of computer failures and network partitions.

Spread is designed to encapsulate the challenging aspects of asynchronous networks and enable the construction of scalable distributed applications, allowing application builders to focus on the differentiating components of their application.
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JavaGroups - A Toolkit for Reliable Multicast Communication
JavaGroups is a toolkit for reliable multicast communication. It can be used to create groups of processes whose members can send messages to each other. The main features include

Group creation and deletion. Groups members can be spread across LANs or WANs
Joining and leaving of groups
Membership detection and notification about joined/left/crashed members
Detection and removal of crashed members
Sending and receiving of member-to-group messages (point-to-multipoint)
Sending and receiving of member-to-member messages (point-to-point)
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In Memory Session Replication with Tomcat 4
In this article we will cover one of the clustering technologies, HTTP session replication, that is used within the J2EE model. In the second half of the article, an example is provided of how session replication can be implemented using Tomcat in conjunction with JavaGroups, a communication protocol which can perform reliable multicast operations to transfer session state between nodes. However, let us first begin with a general introduction to clustering.
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