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

ISBN-10: 3540001654

ISBN-13: 9783540001652

This publication offers the revised model of 7 tutorials given on the NETWORKING 2002 convention in Pisa, Italy in could 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 based on conversation patterns
- comments on ad-hoc networking
- verbal exchange via digital technologies
- optical networks.

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No network coverage). Finally, traditional distributed systems assume a stationary execution environment, characterised by stable and high bandwidth, fixed location for every hosts. Recent developments in object oriented middleware have introduced asynchronous primitives in order to allow a more flexible use. As we will see asynchronous primitives could be a better choice in mobile scenarios. In mobile systems look-up service components are used to hide service location in order to allow reconfiguration with minimal disruption.

8. The UIC Interaction Paradigm (from [60]). On top of a framework very similar to UIC, Gaia [14] has been developed adding support for dynamic adaptation to context conditions. Gaia defines active spaces where services, users, data and locations are represented and manipulated dynamically and in coordination. Gaia defines a set of further services such as event distribution, discovery, security and data storage. Some other approaches in this direction have been developed focusing on meta-data representation for services and application depended policies.

We now justify a set of choices which are generally made by the middleware that we will describe. Mobile Devices → Light Computational Load. Mobile applications run on resource-scarce devices, with little memory, slow CPU, and generally limited battery power. Due to these resource limitations, heavy-weight middleware systems optimised for powerful machines do not seem to suit mobile 32 C. 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.

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