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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Extra resources for Advanced Lectures on Networking Networking 2002 Tutorials
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 , its successor Odyssey , Bayou [18,73] and Xmiddle  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 ). 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.