| Service Oriented Architecture (SOA) has a profound impact on modern software development model, and it provides the services for other application programs through the mechanisms such as publishing, finding and binding. SOA is a coarse-grained, loosely coupled service structure. Through the use of the SOA framework, the coupling between systems can be reduced and the software reusing can be improved, therefore the remaining system can achieve a better integration and the information island can be eliminated and it can also upgrade the system flexibility and expandability.Web service relies on the platform and language irrelevant becomes the main realization technology of SOA, but it lacks the management mechanism of state and can not meet the requirement of notification service with it's request/correspond information exchange model. The Web Service Resource Framework (WSRF) solved the question that web service can not have the stateful resource.WS-Notification (WSN) used publishing/subscription pattern to formulate in the web service environment to found the event-driven services.This paper particularly introduces the concept, the architecture and the design principle of SOA at first. It point out the advantage of SOA to enterprise application and what benefit it can brings to the enterprise on technology and business. Then, this paper analyzes why web service is stateless and introduces the WSRF and WSN specification. Against civil aviation information platform for event-driven service demand, through research web service resources framework and web services notification, this paper modes flights resource with web services, designs the flight notification service base on stateful service, introduces the message exchange model of the service. It also introduces the design patterns with related and fight resource life circle management. Finally this paper realizes a prototype system verified the feasibility of the program. |
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