| With the further development of Web service application, single Web servicecannot meet the changing needs of the industry enterprises, thus put forward thetechnology of Web service composition. As the enterprises want to speed of theservice and get a higher service quality, the service performance has attracted moreand more attentionAt present the analysis of web composite service performance researchers ismainly focused on the analysis method in process algebra based on Pi calculus andanalysis method based on Petri network. Cause the Petri network has a rich systemdescription methods and analysis techniques, so use Petri nets to describe thecombination of more intuitive. In the web services composition, it always appears thatuser queuing phenomenon, in order to make a comparative study of web servicecomposition performance, this paper analyzes and compares two types can be used todescribe a process model of web service composition of the queuing system: queuePetri net and colored timed Petri net, respectively, simulation experiments usingQPMEHE simulation tool CPN-Tools.This paper is divided into three parts: the first is the introduction, including thequeue Petri net and colored timed Petri net is defined; second is the use of a speciallanguage for describing BPEL Web services business process execution, throughproper mapping rules and constraints, to achieve the various activities in BPEL(including element and structure activities) are converted into QPN and TCPNsimulation model; Finally the correctness verification of BPEL mapping rule, the useof CPN-TOOLS and QPME two kinds of tools to describe, in terms of structure andorder structure, when the probability of entering the conditional branch, branchchange, and change the single service business hours, the impact on systemperformance, a comparison of two models to describe the similarities and differencesbetween the method of income conclusion, analysis may result in difference. |
PDF Full Text Request