基于预申请和功能替代的Web服务流程事务模型

WEB SERVICE PROCESS TRANSACTION MODEL BASED ON APPLY BEFOREHAND AND FUNCTIONAL ALTERNATION CHARACTERISTICS

W eb服务的出现是Internet技术发展的一次革命,使得W eb上的交互方式从以信息为中心转化为以服务为中心,从而使Internet上的各种应用集成成为可能。目前,各个标准化组织制定了许多W eb的服务流程协作规范,在业务流程管理(BPM)上得到了广泛的应用,如:电子商务、企业间的应用集成等。事务为流程协作提供了可靠性保障,当前的W eb服务流程协作规范对事务的支持主要基于补偿事务,然而通过补偿回滚已完成的事务代价较大。为了尽可能地减少补偿回滚的发生,提高W eb服务流程事务的成功率,提出了基于预申请和功能替代的W eb服务流程事务模型。该模型提出的预申请阶段完成了对关键资源的预定,减少了并发冲突;另一方面,该模型提出的功能替代整合了Internet/Intranet上存在的许多功能语义相同的W eb服务,从而大大地提高W eb服务流程事务的成功率。

The appearance of Web Service is a revolution of Internet technology. It changes the way of interaction of the Web from information-oriented to service-oriented, thus facilitate the EAI in Internet. At present, many organizations have instituted their proposals of Web Service process collaboration,thus gain broad application in business process management, e, g. e-commerce, EAI. Transaction provides reliability to process collaboration. Current proposals of Web Service process transaction mainly are besed on compensation. However,rolling back a previously completed transaction is potentially expensive. This paper presents an apply beforehand and functional alternation based Web Service process transaction model for decreasing the chance of rolling back and increasing the success probability of Web Service process transaction. The model presents the apply beforehand phase that prearranges the key resources for reducing the concurrency conflict ;The model also presents the tunctional alternation characteristics which integrate the functional equivalence Web Service in Internet or Intranet, thus increase the success probability of Web Service process transaction.