taTHP: 一种THP的改进事务模型

随着电子商务的迅速崛起,Web服务逐渐成为Web领域一个崭新的分布式计算模型.在自治的、松耦合的Web服务事务环境中,由于事务参与者不能提供长时排它的资源锁定模式,因而无法继续采用传统的ACID事务结构.换而言之,Web服务事务处理必须具备针对松散耦合事务环境及自治资源提供策略的协调能力.本文在THP(TentativeHoldProtocol)事务模型的基础上,进一步发展了资源的“准”占用思想,提出了一种具备“事务意识”的新型资源协调算法,从而使系统性能有了较大提升.

taTHP: an Improved Transaction Model Based on THP

With the rapid development of e-business, Web service is becoming a new application model for the distributed computing based on the Web. Strict ACIDity and isolation in traditional transaction management is not appropriate for a loosely coupled world of the autonomous web service transactions, where the resources may not be acceptable to lock exclusively for a long period. In other words, the transaction technologies for web service have to provide the abilities to coordinate loosely coupled or autonomous transactions. This paper presents a new transaction model based on THP (Tentative Hold Protocol), which has the ability to apperceive the success probability of a transaction. With the help of the further progress in reservation-pattern, it makes a great improvement in the success-rate of transactions.