基于B+树的BPEL流程异常处理机制研究

Exception Handling Mechanism Based on the BPEL Process of the B+Tree

Web服务组合具有松耦合、自治性的特点,BPEL规范中的异常处理机制也不完善,于是BPEL流程中的异常处理方法是研究的一个主要问题。针对该问题,在流程运行阶段处理异常的一些通用的策略的基础上,提出了基于B+树的等价服务替换算法,分别阐述了BPEL中同步和异步调用Web服务产生异常的情况,最后构架了一个异常处理的系统框架原型。

Web service composition has the characteristics of loose coupling and autonomy, the BPEL specification of exception handling mechanism is not perfect, so BPEL process exception handling is a major problem of the study. To solve the problem, on the basis of some common strategies to handle the exception in the operational phase of the process, replace- ment algorithm based on the equivalent of B ＋ tree is proposed, synchronous and asynchronous web service in the BPEL which produces an anomalous situation is described respectively. Finally an exception handling framework prototype is proposed.