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

By Enrico Gregori, Giuseppe Anastasi, Stefano Basagni

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Extra resources for Advanced Lectures on Networking Networking 2002 Tutorials

Sample text

Example of a distributed system [20]. been attained and goals that still need to be pursued. Our aim is to help middleware practitioners and researchers to categorise, compare and evaluate the relative strengths and limitations of approaches that have been, or might be, applied to this problem. Because exhaustive coverage of all existing and potential approaches is impossible, we attempt to identify key characteristics of existing approaches that cluster them into more or less natural categories.

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. The above mentioned systems are usually targeted to nomadic settings where hand-offs allow mobile devices to roam while being connected. Some minimal support for disconnection is introduced. There have been more serious attempts in the direction of using traditional middleware using a sort of semi-asynchronous paradigm.

1 23 Characterisation of Distributed Systems and Middleware A distributed system consists of a collection of components, distributed over various computers (also called hosts) connected via a computer network. These components need to interact with each other, in order, for example, to exchange data or to access each other’s services. Although this interaction may be built directly on top of network operating system primitives, this would be too complex for many application developers. Instead, a middleware is layered between distributed system components and network operating system components; its task is to facilitate component interactions.

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