A request manager is described that provides a set of communication primitives supporting the cooperation between processes requesting service and processes providing service. These communication primitives allow the initiation and termination of atomic actions at remote sites. They also maintain recoverable action state tables, which can be used to recall uncompleted actions during restart recovery. The presented request manager is a good foundation on which to develop application oriented high-level primitives as well as language level primitives.
rnBesides a detailed description of the services offered by the request manager, the paper develops a request management protocol that, no matter what happens, insures the atomic property of actions. Evaluation nets, which are a modified form of Petri nets, are applied to describe this protocol.
描述了一种请求管理器,该请求管理器提供了一组通信原语,以支持请求服务的进程与提供服务的进程之间的协作。这些通信原语允许在远程站点启动和终止原子动作。它们还维护可恢复的操作状态表,可用于在重新启动恢复期间调用未完成的操作。提出的请求管理器是开发面向应用程序的高级原语以及语言级原语的良好基础。 P> rn
除了对请求管理器提供的服务进行详细描述之外,本文还开发了一个请求管理协议,无论发生什么情况,都能确保动作的原子性。评估网是Petri网的一种改进形式,用于描述该协议。 P>
s European Networking Center, where he was responsible for several projects in the area of distributed application systems. He left IBM in 1990 to become a Professor for Computer Science back at Stuttgart University, where he now leads the Distributed Systems Research Group. His current research interests are communication architectures and protocols, distributed multimedia systems, management of distributed systems, and mobile software agents. He is a member of IEEE Computer Society, ACM and GI.;
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