Fraunhofer Institut für Integrierte Publikations-und Informationssysteme IPSI

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Highly available DHTs

2006 , Knezevic, P. , Wombacher, A. , Risse, T.

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Publication

Overview on decentralized establishment of consistent multi-lateral collaborations based on asynchronous communication

2005 , Wombacher, A. , Fankhauser, P. , Aberer, K.

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Requirements for workflow modeling in P2P - workflows derived from collaboration establishment

2004 , Wombacher, A. , Aberer, K.

Web services advocate loosely coupled systems, although current applications are limited to centrally controlled structures. The reason for this limitation is the lack of a method for deciding collaboration consistency, that is deadlock freeness and boundedness, in a decentralized way. In particular, an intuitive approach classifies collaborations incorrectly being inconsistent due to the loss of information introduced by the decentralization. In this paper we identify loss of message ordering and message parameter value constraints caused by the decentralization to be the reasons for incorrect decision results. The proposed approach to overcome this issue is to explicate these constraints, which cannot represent in common workflow models.

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Ein neuer Ansatz zum Vertrieb digitaler Medien

2004 , Wombacher, A. , Steinebach, M. , Wandinger, A.

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Process-annotated service discovery facilitated by an n-gram-based index

2005 , Mahleko, B. , Wombacher, A. , Fankhauser, P.

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Matchmaking for business processes based on choreographies

2004 , Wombacher, A. , Frankhauser, P. , Mahleko, B. , Neuhold, E.J.

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P2P evolution: From file-sharing to decentralized workflows

2004 , Risse, T. , Knezevic, P. , Wombacher, A.

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A grammar-based index for matching business processes

2005 , Mahleko, B. , Wombacher, A. , Fankhauser, P.

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Publication

Configuration of distributed message converter systems

2004 , Risse, T. , Aberer, K. , Wombacher, A. , Surridge, M. , Taylor, S.

Finding a configuration of a distributed system satisfying performance goals is a complex search problem that involves many design parameters, like hardware selection, job distribution and process configuration. Performance models are a powerful tool to analyze potential system configurations, however, their evaluation is expensive, such that only a limited number of possible configurations can be evaluated. In this paper we present a systematic method to find a satisfactory configuration with feasible effort, based on a two-step approach. First, performing a queuing network analysis a hardware configuration is determined and then a software configuration is incrementally optimized by simulating Layered Queuing Network models. We applied this method to the design of performant EDI converter systems in the financial domain, where increasing message volumes need to be handled due to the growing importance of B2B interaction.

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Publication

Matchmaking for business processes based on choreographics

2004 , Wombacher, A. , Frankhauser, P. , Mahleko, B. , Neuhold, E.J.

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