Research On Service Oriented Integration Method Of Legacy System

From the beginning use of it, the new system is racing against the time and aging. With the continuous development of enterprise, any system which developed by a new technology become a legacy systems when it begin to use. Many kinds of systems were established to meet the constantly changing of business requirement. There are many important businesses in legacy system, which accumulated the rich resources. However, the legacy systems are lack of the associations due to the different developing periods, platforms and technologies, so that, they can't be shared. The business between these systems can't be cooperated and the data can't be synthetically used. What's more, the information-construction of enterprise is difficult to progress.In the thought of service oriented architecture, the service granularity can be controlled and the services can be found and composition. Integration method of legacy system based on service oriented architecture is proposed in this paper. First of all, a framework of service oriented legacy system integration is gave. This is a guidance of all the method. Then, there is a research on the service extraction and encapsulation of legacy system which is the base of the integration. In this paper, service is described by semantics which is divided into three layers. In order to facilitate the service discovery and combination, a service resource management method of legacy systems is proposed. The service discovery method of three-layer for the purpose of improving the efficiency of the service discovery is presented. If a single service can't satisfy the user's demands, the service composition begin to work. The way of service composition combine with static and dynamic method. The article puts forward a improved automatically service composition method based on graph for automatically service composition.The method which is presented in this article can solve the problem of integration and the associations of legacy systems. It is easy to cooperate with new systems. In the same time, it can achieve the goal of integration, collaboration of legacy systems and it has immediately reaction, good solution of changeable and diverse business demand.