关键词: Web服务组合, 执行引擎WebJetFlow, 异步模式, 服务代理

Abstract: In this paper,we have tackled three problems：firstly,decoupling the process execution and the differentiated web service scheduling in the web composite service execution engine—WebJetFlow;Secondly,changing the service scheduling of Service Proxy from the synchronous model to the pure asynchronous model;Lastly,adopting NS2 simulator to test the performance of the engine under the circumstance above as well as test the performance of the engine with Service Proxy and without Service Proxy respectively.From the simulation results,we can conclude that the access flow of the engine with Service Proxy is more than the flow of the engine without Service Proxy on the condition of the same thread resources.Moreover decoupling the process execution,the differentiated web service scheduling and the pure asynchronous scheduling model greatly enhance the utilization efficiency of the engine,increase the concurrence of the process execution and improve the throughput and the performance of the engine.

Key words: Web composite service, execution engine webJetFlow, asynchronous model, service proxy