Advanced Lectures on Networking Networking 2002 Tutorials by Enrico Gregori, Giuseppe Anastasi, Stefano Basagni

By Enrico Gregori, Giuseppe Anastasi, Stefano Basagni

This e-book provides the revised model of 7 tutorials given on the NETWORKING 2002 convention in Pisa, Italy in may possibly 2002.The teachers current a coherent view of the middle concerns within the following areas:- peer-to-peer computing and communications- cellular computing middleware- community safeguard within the multicast framework- categorizing computing resources in line with verbal exchange styles- comments on ad-hoc networking- communique via digital applied sciences- optical networks.

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Replication is widely used by middleware systems in order to achieve fault tolerance and to improve scalability. , network communication). Depending on how consistent the replicas are, the computational load of middleware varies accordingly. ). 2. Type of Communication Paradigm. There are basically two types of communication paradigms a middleware system can support: synchronous or asynchronous. The former requires that both the client asking for a service, and the server exporting that particular service, are connected and executing at the same time, in order for the request to be successfully processed.

2 Context-Awareness Based Middleware To enable applications to adapt to heterogeneity of hosts and networks as well as variations in the user’s environment, systems must provide for mobile applications to be aware of the context in which they are being used. Furthermore, context information can be used to optimise application behaviour counter balancing the scarce resource availability. User’s context includes, but is not limited to: - location, with varying accuracy depending on the positioning system used; relative location, such as proximity to printers and databases; device characteristics, such as processing power and input devices; physical environment, such as noise level and bandwidth; user’s activity, such as driving a car or sitting in a lecture theatre.

Mascolo, L. Capra, and W. Emmerich scenarios. Therefore, the right trade-off between computational load and non-functional requirements achieved by the middleware needs to be established. An example of this might be to relax the assumption of keeping replicas always synchronised, and allow the existence of diverging replicas that will eventually reconcile, in favour of a lighter-weight middleware. We will see examples of this in some of the middleware described in Section 5. Intermittent Connection → Asynchronous Communication.

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