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computation orchestration - A basis for wide-area computing

SOFTWARE AND SYSTEMS MODELING 2007年第1期6卷 83-110页

作者： Misra, Jayadev Cook, William R. Univ Texas Austin Austin TX 78712 USA

The widespread deployment of networked applications and adoption of the internet has fostered an environment in which many distributed services are available. There is great demand to automate business processes and workflows among organizations and individuals. Solutions to such problems require orchestration of concurrent and distributed services in the face of arbitrary delays and failures of components and communication. We propose a novel approach, called Orc for orchestration, that supports a structured model of concurrent and distributed programming. This model assumes that basic services, like sequential computation and data manipulation, are implemented by primitive sites. Orc provides constructs to orchestrate the concurrent invocation of sites to achieve a goal - while managing time-outs, priorities, and failure of sites or communication.

关键词： wide-area computing web services computation orchestration distributed computing process algebra thread-based programming

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A timed semantics of Orc

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THEORETICAL COMPUTER SCIENCE 2008年第2-3期402卷 234-248页

作者： Wehrman, Ian Kitchin, David Cook, William R. Misra, Jayadev Univ Texas Austin Dept Comp Sci Austin TX 78712 USA

Orc is a kernel language for structured concurrent programming. Orc provides three powerful combinators that define the structure of a concurrent computation. These combinators support sequential and concurrent execution, and concurrent execution with blocking and termination. Orc is particularly well-suited for task orchestration, a form of concurrent programming with applications in workflow, business process management, and web service orchestration. Orc provides constructs to orchestrate the concurrent invocation of services while managing time-outs, priorities, and failures of services or communication. Our previous work on the semantics of Orc focused on its asynchronous behavior. The inclusion of time or the effect of delay on a computation had not been modeled. In this paper, we define an operational semantics of Orc that allows reasoning about delays, which are introduced explicitly by time-based constructs or implicitly by network delays. We develop a number of identities among Orc expressions and define an equality relation that is a congruence. We also present a denotational semantics in which the meaning of an Orc program is a set of traces, and show that the two semantics are equivalent. (C) 2008 Elsevier B.V. All rights reserved.

关键词： Orc computation orchestration semantics time concurrency process algebra web services

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