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Frameworks and design patterns are emerging technologies in software engineering. They increase software quality in terms of reusability, modularity and extensibility. Synchronous groupware can benefit of these new technologies. This article describes AMF-C, a multiagent model which structures each agent with a various number of facets, and two associated(More)
Under overload condition, a processing server contributes to the poor QoS through sustaining heavy request queuing delays and prolonged processing time. Admission control is a well known mean to prevent a server overload. Most state of the art research advocate session oblivious mechanisms where the dropping of the requests pertaining to an accepted session(More)
Internet server clustering has been widely used by operators to improve the scalability and the availability of the rendered services under heavy load condition. Load balancing is a well known mean to optimize the usage of the cluster available resources by fairly allocating them to the offered network traffic. Most state-of-the-art research advocate either(More)
This work aims to make a survey on high availability mechanisms in both local and distributed cluster based architectures. We address both scalability and failover mechanisms for IP Network data applications. We investigate in comparing the major layer 4 and layer 5 level switching solutions as well the undergoing load balancing policies used to achieve a(More)
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