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首页> 外文期刊>International journal of web services research >The DeltaGrid Service Composition and Recovery Model
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The DeltaGrid Service Composition and Recovery Model

机译：DeltaGrid服务组合和恢复模型

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This research has defined an abstract execution model for establishing user-defined correctness and recovery in a service composition environment. The service composition model defines a flexible, hierarchical service composition structure, where a service is composed of atomic and/or composite groups. The model provides multi-level protection against service execution failure by using compensation and contingency at different composition granularity levels, thus maximizing the potential for forward recovery of a process when failure occurs. The recovery procedures also include rollback as a recovery option, where incremental data changes known as deltas are extracted from service executions and externalized by streaming data changes to a Process History Capture System. Deltas can then be used to backward recover an operation through a process known as Delta-Enabled Rollback. This article defines the semantics of the service composition model and the manner in which compensation, contingency, and Delta-Enabled-rollback are used together to recover process execution. The authors also present a case study and describe a simulation and evaluation framework for demonstrating the functionality of the recovery algorithm and for evaluating the performance of the recovery command generation process.
机译：这项研究定义了一种抽象执行模型，用于在服务组合环境中建立用户定义的正确性和恢复性。服务组合模型定义了一种灵活的，分层的服务组合结构，其中服务由原子和/或复合组组成。该模型通过在不同的组成粒度级别上使用补偿和偶发事件，提供了针对服务执行失败的多级保护，从而在发生故障时最大程度地向前恢复流程。恢复过程还包括回滚作为恢复选项，其中从服务执行中提取称为增量的增量数据更改，并通过将数据更改流式传输到Process History Capture System进行外部化。然后，可以使用增量来通过称为启用增量的回滚的过程来向后恢复操作。本文定义了服务组合模型的语义，以及将补偿，偶然性和Delta-Enabled-rollback一起用于恢复流程执行的方式。作者还提出了一个案例研究，并描述了一个仿真和评估框架，用于演示恢复算法的功能并评估恢复命令生成过程的性能。

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