A System Analysis Deficiencies Of Developing Distributed Systems Using Web Service Based SOA And A Study Of "Sagacity" Service Oriented Architecture Methodology

SOA is an increasingly sophisticated software architecture. With the Web Service gradually been widely adopted and realized, the situation of heterogeneous systems and the application of isolated islands is radically changed. So service-oriented architecture was widely recognized, because of the important role in the IT projects.Currently, the world's leading software vendors have introduced SOA Solution such as BEA, IBM and so on, but no one of these companies can provide a universal and relatively well-mentoring SOA methodology.In this context, this article is based on Mobile Position System QualityFramework project and some other enterprise distributed system projects. And this article made systematic summary of problems and deficiencies in using SOA instructing distributed system development. And it combined with a number of innovative points put forwards a "sagacity" methodology based on the Web Services. (This article is referred to as" SSOAM").SSOAM has some advantages. It can provide distribution system templates based on WebServices development .And it also can help system architects, project managers carve up the development stage and anticipate future problems with the project. Finally,it can provide accurate guidance to the development and testing staff. So it can avoid reworking the project, duplication of labor and increasing development efficiency.The main contents and innovation of this article are as follows.1, It summed up problems and deficiencies in domestic and international using SOA instructing distributed system development.2, It raised to two-dimensional matrix model SSOAM methodology.3, The definition of service for legacy systems is different from the other definition of the integration of legacy systems.4, SSOAM is the core of the SSC (System-Service Centers) which completed all the work of service control. Is is also a key to solve system integration problems. The SSC accepts requests for information, and locates all the data services that are necessary for satisfying the information request.It invokes the appropriate data services, and aggregates the results. At last, it returns them to the service requester. SSC includes statute of service information, communication, data model, services registration / find, SSC security, SSC agents, communication model and service management. 5, Parts of services implementation use multi-tier application framework for SOA as a guide. It includes process control, scheduling, service definition of integration, communication services, SSC, the expansion of services.6, Finally, NA's business integration with industrial integration is to verify SSOAM effectiveness.