Study And Design On Asynchronous Reliable Web Services Based On MOM

As a kind of technology capable of quickly integrating applications,Web Services has represented itself as the latest tide with wide potential prospect in distributed compute field,has been widely applied in all kinds of E-commerce. However, for the time that Web Services technology puts out is still relatively short, there are many respects remaining unripe. Presently the widely used transport protocol in Web Services is HTTP, which is synchronous and doesn't offer quality of service(QOS) guarantee. This is not good for those sophisticated business applications characteristic of asynchronous message transmission and high reliability, and dosen't suit the development of software technology characteristic of SOA. Therefore embarrasses Web Services competition on the large-scale and key applications domain. With Web Services' application scope expanding and further researching, the flexible message transmission and reliable quality of service have collected many attentions from lots of investigators. However there are not existing uniform standards and specifications defining what message transmission and reliability are under the specific Web Services context.This thesis is motivated by the observation that enterprise applications necessarily need asynchronous and reliable messaging mechanism when adopting Web Service technology. bases on the current Web Services architecture, specifications and Message Oriented Middleware, takes the credit domain as typical application scene to investigate the asynchronous message transmission and reliability. Then, on the basis of our study, we develop a middle-ware system -MQ4WS,for supplying asynchronous and reliable Web Services.The primary contributions of this thesis include the following three parts.Firstly, based on the WS concept architecture this thesis investigates message mechanism, analyzes the underlying synchronous/asynchronous message transmission and synchronous/asynchronous message operations. Making the former research as foundation, this thesis discusses at length four message patterns based on the.synchronous message transmission which could complete asynchronous WS operation.Secondly, we advance the reliable Web Services reference model and discuss itscharacteristics. Then after analyzing the support from the existing WS specifications, we put forward the server side reliable message delivery and the reliable implement of applications based on the assurance from the mature Message Oriented Middleware.Last, grounded on our developed WS deployment, we design and implement a supplying asynchronous reliable WS middleware system called MQ4WS, which consists of MQ4WS Client Component and MQ4WS Server Component,which is based on Joram,and provided four mode to support Web Services invocation.The exploration to the asynchronism and reliability of WS has the significant practice meaning for improving the performance,quality of service of WS and expanding the scope of WS applications.