Extending Grid-Based Workflow Tools With Patterns/Operators

Abstract

Many grid applications involve combining computational and data access components into complex workflows. A distinction is generally made between mechanisms to compose 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 functions 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 demonstrate how such patterns — and subsequently operators — may be used. Their implementation within the Triana Problem Solving Environment is also described.

Enforcing QoS in scientific workflow systems enacted over Cloud infrastructures

“…Gomes et al [19] also represent scientific workflows as a Petri net and demonstrate how patterns and operators can be used to adapt, dynamically, the structure of a workflow. They discuss the use of behavioural patterns and operators which can be applied to a pipeline structure (encoded in their work as a 'structural pattern') for changing data flow between components in the workflow.…”

Facilitating Scientific Workflow Configuration with Parameterized Workflow Skeletons

“…Triana deploys a pattern-based programming framework for scientific workflows [2]; in this approach workflows are built of design patterns that can be manipulated through a set of operators. It is possible to reconfigure both the structure and the behavior.…”

“…Designing systems using high-level abstractions for such parallel patterns has obvious advantages. This has long been recognized in structured parallel and distributed programming [1], [2].…”

Accessing Wireless Sensor Networks Via Dynamically Reconfigurable Interaction Models

“…Such is accomplished following the ideas in [16] where pattern abstractions in the form of parameterized Pattern Templates capture structure and behavior with separation of concerns, allowing their flexible composition.…”

“…Finally, our solution is based on the work by [16] which, however, does not provide a session abstraction to contextualize and reuse dynamic interaction models, nor implements a state machine for pattern-based system evolution.…”