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 booklet provides the revised model of 7 tutorials given on the NETWORKING 2002 convention in Pisa, Italy in might 2002.
The academics current a coherent view of the middle matters 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 communique patterns
- feedback on ad-hoc networking
- communique via digital technologies
- optical networks.

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However, these middleware systems require resource-rich devices, especially in terms of amount of memory in which to store persistent queues of messages received but not already processed. Sun’s Java Message Queue [44] and IBM’s MQSeries [55] are examples of very successful message-oriented middleware for traditional distributed systems. We believe there is scope for use of these middleware in mobile settings, and we will discuss how some adaptation of JMS has recently been ported to mobile. 3 Transaction-Oriented Middleware Transaction-oriented middleware systems are mainly used in architectures where components are database applications.

We now analyse in more details the relationship between the physical structure of fixed distributed systems and the characteristics of associated middleware. Fixed Devices → Heavy Computational Load. As discussed in Section 2, wired distributed systems consist of resource-rich fixed devices. ) in order to deliver the best quality of service to the application. The higher the quality of service, the heavier the middleware running underneath the application. This is due to the set of non-functional requirements that the middleware achieves, like fault tolerance, security or resource sharing.

Also actual names of machines are translated dynamically through a name server, which maintains up-to-date information of the hosts location. In [56] CORBA and IIOP are used together with the WAP (Wireless Access Protocol) stack [24] in order to allow the use of CORBA services on a fixed network through mobile devices connected through WAP and a gateway. IIOP is used to achieve message exchange. In general, the synchronous connectivity paradigm introduced by traditional middleware assumes a permanent connectivity that cannot be given as granted in most of the mobile computing scenarios.

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