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RCOST- Research Centre on Software Technology QoS-Aware Replanning of Composite Web
BibTeX
@MISC{Execution_rcost-research,
author = {Service Execution and Gerardo Canfora and Massimiliano Di Penta and Raffaele Esposito and Maria Luisa Villani},
title = {RCOST- Research Centre on Software Technology QoS-Aware Replanning of Composite Web},
year = {}
}
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Abstract
Run-time service discovery and late-binding constitute some of the most challenging issues of service–oriented software engineering. For late-binding to be effective in the case of composite services, a QoS-aware composition mechanism is needed, that is, determining the set of services that, once composed, not only will perform the required functionality, but also will best contribute to achieve the level of QoS promised in Service Level Agreements. However, QoS-aware composition relies on estimated QoS values of the component services and on probabilities for the workflow execution traces. At runtime, the actual QoS values of the individual services may deviate from the estimations and the execution path may not be the one foreseen. These changes could have a drastic impact on the expected overall QoS of the service. Thus, the risk of breaking SLAs and obtaining a poor QoS could be avoided by replanning the service bindings of the workflow part still to be executed. In fact, the new binding could compensate the observed workflow QoS loss, or simply lead to a suboptimal solution still within the SLAs.
Keyphrases
rcost research centre composite web software technology qos-aware replanning qos value late-binding constitute suboptimal solution observed workflow qos loss component service challenging issue service level agreement individual service overall qos required functionality service binding composite service actual qos value workflow part software engineering run-time service discovery poor qos qos-aware composition relies qos-aware composition mechanism drastic impact new binding workflow execution trace execution path
