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

By Enrico Gregori, Giuseppe Anastasi, Stefano Basagni

This publication offers 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 center matters within the following areas:- peer-to-peer computing and communications- cellular computing middleware- community defense within the multicast framework- categorizing computing resources based on communique styles- feedback on ad-hoc networking- communique via digital applied sciences- optical networks.

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In order to guarantee the interoperability, relationships between different models must be defined and data formats must be exchangeable. All these different aspects concerning the management of data within Nexus are managed by the Distributed data Management component. 3 Data Sharing-Oriented Middleware One of the major issues targeted is the support for disconnected operations and data-sharing. Systems like Coda [63], its successor Odyssey [62], Bayou [18,73] and Xmiddle [40] try to maximise availability of data, giving users access to replicas; they differ in the way they ensure that replicas move towards eventual consistency, that is, in the mechanisms they provide to detect and resolve conflicts that naturally arise in mobile systems.

Mascolo, L. Capra, and W. Emmerich ing on this middleware are constructed decoupling the application functionalities from the application context-awareness, where policies are defined to adapt to context. Fig. 9. The event notification architecture (from [76]). The main idea of these systems is to offer the ability to change the behaviour of the middleware and application based on the knowledge on the changing context. This seems to be a valid idea given the scarce resources and the dynamicity of the mobile environment.

Asynchronous communication mechanisms are however also provided by message oriented middleware (MOM) and recently also by the CORBA specification. Asynchronous communication is used also in fixed networks, however the bulk of middleware applications have been developed using synchronous communication. Static Context → Transparency. The execution context of a fixed distributed system is generally static: the location of a device seldom changes, the topology of the system is preserved over time, bandwidth remains stable, etc.

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