Study And Implement On Critical Issues Of Asynchronous Reliable Web Services

Being an emerging middleware, Web Services (WS) have been widely applied in all kinds of e-commerce. Presently those applications are all confined in the simple business coming from the synchronous message acquirement. However it is not good for those sophisticated business which need the asynchronous message transmission and high reliability. So it embarrasses WS 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 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 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 its characteristics. 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 and configuration tool StarWebAdaptorl .0, we design and implement a supplying asynchronous reliable WS middleware system called SOAP-JMS, which consists of SJIT (SOAP-JMS Inter-Transformer) and AM (Asynchronous Messaging). SJIT completes the inter-translation between SOAP and JMS, further more provides the management and configuration of entire system; AM supplies the flexible messagetransmission between the Web Services providers and requestors.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.