Extending grid-based workflow tools with patterns/operators

Many grid applications involve combining computational and data access components into complex workflows. A distinction is generally made between mechanisms to com-pose components (referred to as build-time functions) and subsequent mechanisms to execute these components on distributed resources (referred to as run-time functions). An approach to supporting such build- and run-time func-tions using specialist patterns and operators is presented. “Structural ” patterns may be treated as meta-components within a workflow system, and used within the composition process. Subsequently, such components may be scheduled for execution using “behavioral ” patterns via the enactment process. Application examples are presented to demon-strate how such patterns – and subsequently operators – may be used. Their implementation within the Triana Prob-lem Solving Environment is also described. Key words: workflow management, grid computing, design patterns, scheduling, reconfiguratio