关键词: 遗留系统, 服务识别, 多目标优化, 粒子群优化算法

Abstract: To identify the high quality services from object oriented legacy systems,a semi-automated service identification method of legacy system(SIOL)was proposed.Through analyzing the Component Identification Method(CIM)and Service Identification Method(SIM),the problem of service identification was transformed into partitioning problem of business process graph by taking business process model and Unified Modeling Language(UML)diagrams as input.To get the optimal solution of graph partitioning,the graph partitioning was regarded as multi-object optimization problem.The quantitative relationship of service's granularity,coupling and cohesion was defined respectively,and service identification model of multi-object optimization was built.By linear weighted,a service identification algorithm for legacy system based on particle swarm optimization algorithm was given.The proposed method was used for designing web services in a legacy system,and the effectiveness was verified by comparison experiment.

Key words: legacy system, service identification, multi-objective optimization, particle swarm optimization algorithm