服务计算模式的耦合性与隔离性

Coupling and Isolation for Web Computing Paradigm

服务计算作为Internet分布式计算的一种高层模式近年受到广泛的关注,但人们对刻画其计算环境特征的耦合性度量的认识仍然停留在词语的层次,针对并发过程正确性的有关隔离性的讨论普遍与服务计算的松耦合性内涵相分离。该文给出了计算模式耦合性的诠释,阐明了聚合服务计算模式的事务处理能力的局限性,探讨了通过在服务计算脚本中拆离或归约并发临界区等途径来寻找保证并发隔离性实现的做法,提出了不期望在松散耦合服务计算环境上得到隔离性保证的聚合原则。

Service computing as a high level paradigm of Internet distributed computing is attracting extensive research concerns in recent years. The recognition on the coupling metric of the Web computing is still hovering on the level of dictionary lexical meaning. Researches on isolation for the concurrent process correctness are commonly separated from the coupling metric connotation of service computing. This paper gives the explanation of the coupling metric of computing paradigm, and illustrates the essence of short ability of composing service paradigm for transaction requirements, as well as approaches to guarantee isolation by separating or reducing the concurrent critical sections in service computing scripts. It concludes that do not expect the isolation-guarantee for loosely-coupled service computing environments normally.