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By Bertrand Meyer (auth.), Jürg Kohlas, Bertrand Meyer, André Schiper (eds.)

ISBN-10: 3540368213

ISBN-13: 9783540368212

Modern civilization will depend on a functioning details infrastructure. therefore, dependability has develop into a important factor in all disciplines of structures engineering and software program architecture.Theories, equipment and instruments that aid to grasp the issues encountered within the layout strategy and the administration of operations are consequently of maximum value for the way forward for details and communique technology.

The current quantity records the result of a learn application on liable info and verbal exchange platforms (DICS). The individuals of the venture met in workshops prepared through the Hasler beginning. This state of the art survey includes three assessment articles picking out significant problems with dependability and offering the newest strategies, in addition to 10 conscientiously chosen and revised papers depicting the learn effects originating from these workshops. the 1st workshop came about in Münchenwiler, Switzerland, in March 2004, and the second one workshop, which marked the belief of the tasks, in Löwenberg, Switzerland, in October 2005. The papers are prepared in topical sections on surveys, in charge software program, in charge computing, and loyal networks.

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Additional resources for Dependable Systems: Software, Computing, Networks: Research Results of the DICS Program

Sample text

Note that this superficial presentation hides most of the problems related to the implementation of passive replication. We mention them in the 1 A server is deterministic if its new state and the response depend only on the request and on the state before processing the request. 40 A. Schiper next paragraph. With active replication, the implementation problems are hidden in the implementation of the group communication primitive that orders the clients’ requests. Client Request Response S1 = primary Request processing S2 Update S3 Fig.

Meyer testing, we want the test process to cover as many cases as possible, and especially to make sure they are representative of the various potential program executions—as can be assessed in white-box testing by coverage measures and mutation, but needs to be sought in any form of testing. For any realistic program, manually prepared tests will never cover enough cases; in addition, they are tedious to prepare. Hence the work on automatic test case generation, which tries to produce as many representative test cases as possible, typically working from specifications only (black-box).

Request COin = COout CO response client server Fig. 1. 2 Consistency Criteria A server S can have many clients C, C , C , etc. For a non-replicated server S, the simplest implementation is to handle client requests sequentially, one at a time. A more efficient implementation could consist for the server to spawn a new thread for each new incoming request. However, in this case the result that the client obtains must be the same as if the operations were executed sequentially, one after the other.

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Dependable Systems: Software, Computing, Networks: Research Results of the DICS Program by Bertrand Meyer (auth.), Jürg Kohlas, Bertrand Meyer, André Schiper (eds.)


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