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- Fakas, Georgios John, et al.
(author)
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A peer to peer (P2P) architecture for dynamic workflow management
- 2004
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In: Information and Software Technology. - : Elsevier. - 0950-5849 .- 1873-6025. ; 46:6, s. 423-431
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Journal article (peer-reviewed)abstract
- This paper presents the architecture of a novel Peer to Peer (P2P) workflow management system. The proposed P2P architecture is based on concepts such as a Web Workflow Peers Directory (WWPD) and Web Workflow Peer (WWP). The WWPD is an active directory system that maintains a list of all peers (WWPs) that are available to participate in Web workflow processes. Similar to P2P systems such as Napster and Gnutella, it allows peers to register with the system and offer their services and resources to other peers over the Internet. Furthermore, the architecture supports a novel notification mechanism to facilitate distributed workflow administration and management. Employing P2P principles can potentially simplify the workflow process and provide a more open, scalable process model that is shared by all workflow participants. This would enable for example a WWP to connect directly to another without going through an intermediary, currently represented by the workflow process management server. P2P workflow becomes more efficient as the number of peers performing the same role increases. Available peers can be discovered dynamically from the WWPD. The few currently existing P2P based workflow systems fail to utilise state of the art Web technologies such as Web Services. In contrast, using the approach described here it is possible to expose interoperable workflow processes over the Internet as services. A medical consultation case study is used to demonstrate the proposed system.
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| 3. |
- Karakostas, Bill, et al.
(author)
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An architecture for reliable mobile workflow in a grid environment
- 2009
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In: Internet and Web Applications and Services, 2009. ICIW’09. Fourth International Conference on. ; , s. 499-504
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Conference paper (peer-reviewed)abstract
- Mobile peer to peer (P2P) computing is becoming a major revolution in computing owing to advances in computing power, network connectivity and storage capacity of mobile devices. Mobile workflow is, however, characterized by the unreliability of mobile peers who can drop out of the network due to sudden loss of connectivity, drained battery and so on, thus making problematic the guaranteed completion of Workflow Processes in accordance with deadlines. Existing research in P2P Workflow Management has not considered the problem of guaranteeing workflow process completion in an unreliable mobile peer environment. This paper proposes a P2P Workflow Management Architecture for the distributed definition and execution of workflows in a grid environment of mobile peers. The architecture is based on the use of proxies, i.e. fixed grid nodes with which mobile peers register and which act as workflow coordinators. Proxies employ statistical reliability measures of mobile peers in order to calculate the redundancy in the number of peers required to participate in a workflow. The performance of the proposed architecture is illustrated in a journalism scenario.
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| 4. |
- Karakostas, Bill, et al.
(author)
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Workflow requirements modelling using XML
- 2002
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In: Requirements Engineering. - : Springer-Verlag London Limited. - 0947-3602 .- 1432-010X. ; 7:3, s. 124-138
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Journal article (peer-reviewed)abstract
- When modelling inter-organisational workflow it is important not to make assumptions such as with regard to the formats of the data exchanged between the workflow participants or the technical infrastructures and platforms, as they can restrict the range of possible workflow management implementations. The approach presented in this paper allows for the conceptual modelling of workflow processes using primitive constructs such as nodes, rules and business documents. The paper presents both a graphical notation for modelling workflows as well as a mapping of the workflow constructs to XML models that follows the Workflow Management Coalition interoperability standards. This allows the modelled workflow to be interpreted and executed by a variety of workflow engines.
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