| Service-Oriented Architecture (SOA) is a component model that inter-relates an application's different functional units, called services, through well-defined interfaces and contracts between these services.To optimize the IT infrastructure and deliver the service in time to make the SOA possible, IT forum needs an intelligent structure to reduce the complexity of the service reusability, and to integrate all technologies, protocols and applications. For this reason, the IT forum creates an abstract layer focus on the "service" to reduce the underlying complexity by integrating all applications and technologies.Such a layer for services is called Enterprise Service Bus(ESB).Firstly , the thesis shows the technology and theoretical foundation about SOA,and also analyzes the character of SOA;Secondly, the model of ESB is introduced that why to design SOA in using ESB is pointed out, and ESB's work mechanism is deeply researched. Thirdly,a SOA reference model based on ESB is given by J2EE technology as an cut-off point, the SOA atchitecture's centeral virtue is the server transparency and loosely coupling;Finally,the SOA architecture is extended to integrate all kinds of information resources, making it face different technologies, protocols,and applications.At last, comparing with other ESB products,the thesis selects AquaLogic Service Bus that is produced by Bea. The paper tells us the application of the SOA architecture based on ESB by combining an actual project. In the process of implementing system, by designing, implementing service and deploying service in service bus, then validating system function and capability, the paper implements location's transparency,server's loosely coupling , server's pool management, content-based dynamic routing and much better server'reuse, it reflects the character of the flexibility and shortcut in designing enterprise application. And the experience and disadvantages of the system are summarized, which settled the base of succeeding jobs. |
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