基于冲突概率的组合服务事务混合并发控制算法

由于Web服务的松散耦合性及独立性的特点，组合服务中的两个服务可以并行运行。针对这一特点，结合乐观并发与悲观并发控制的优点，提出一种基于冲突发生概率的混合并发控制机制，以提高Web服务的并发度。由于充分考虑了不同组合服务实例的并发控制，以及同一种组合服务实例的并发控制，使得该机制能够确保在复杂的应用环境中，多个组合服务实例并发执行的正确性和一致性。

Mixed concurrency control algorithm of composed service transaction based on conflict probability

Because Web Services are relaxed coupled and independent to each other, two single services in a composed service can execute concurrently. In allusion to the characteristic, combining the advantages of optimistic and pessimistic concurrency controls, this paper presented a mixed concurrency control mechanism on occurrence probability of conflict, which can improve the degree of concurrency. Taking full account of concurrency control of instances which are form the same composed Web Services or different composed Web Services, the mechanism can ensure correctness and consistency when multi instances of composed web service execute concurrently.