Advanced Lectures on Networking: NETWORKING 2002 Tutorials by Jon Crowcroft, Ian Pratt (auth.), Enrico Gregori, Giuseppe

By Jon Crowcroft, Ian Pratt (auth.), Enrico Gregori, Giuseppe Anastasi, Stefano Basagni (eds.)

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 accordance with verbal exchange patterns
- comments on ad-hoc networking
- verbal exchange via digital technologies
- optical networks.

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Section 3 presents a reference model; Section 4 describes the main characteristics of middleware for distributed systems and their limitations in terms of mobility requirements. Section 5 contains a detailed and comparative review of the major results reached to date, based on the framework presented before. For every class, we give a brief description of the main characteristics, illustrate some examples, and highlight strengths and limitations. Section 6 points out future directions of research in the area of middleware for mobile computing and Section 7 concludes the paper.

In [76] another approach to context-awareness in mobile computing is presented. The paper presents a middleware for event notification to mobile computing applications. Different event channels allow differentiation of notification of different context and environmental variables. Figure 9 shows the architecture of the system. The asynchronous event channel suits the mobile computing setting allowing for disconnection; however the model the authors assume is based on permanent but fluctuating connectivity.

The weak consistency of the replicated data is not transparent to applications; instead, they are aware they may be using weakly consistent data and that their write operations may conflict with those of other users and applications. Moreover, applications are involved in the detection and resolution of conflicts since these naturally depend on the semantics of the application. In particular, the system provides the application with ways of specifying its own notion of a conflict, along with its policy for resolving it.

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