The run-time monitoring of web service compositions has been widely acknowledged as a significant and challenging problem. In this paper, we propose a novel solution to the problem of monitoring web services implemented in BPEL. We devise an architecture that clearly separates the business logic of a web service from its monitoring functionality. The architecture supports both "instance monitors" that deal with the execution of a single instance of BPEL process, as well as "class monitors" that report aggregated information about all the instances of a BPEL process. We also define a language for the specification of instance and class monitors. The language allows for specifying boolean, statistic, and time-related properties. Finally, we devise a technique for the automatic translation of all these kinds of monitors to Java programs. * This work is partially funded by the MIUR-FIRB project RBNE0195K5 "KLASE", "Knowledge Level Automated Software Engineering", by the MIUR-PRIN 2004 project "STRAP", and by the EU-IST project FP6-016004 "SENSORIA".
In the literature, there exist several approaches for monitoring the execution of BPEL processes. They concentrate on different properties, adopt different languages, work at different levels of abstraction, and assume different perspectives. Even if the field is rather new, we do not think that this diversity is a limitation of current solutions; rather it is intrinsic in the problem itself. We claim that, instead of working on the definition of the ultimate approach for BPEL monitoring, we should push a cooperative approach based on the integration of different solutions.In this paper, we present a first step in this direction, and describe a monitoring framework which is obtained by integrating two well-known approaches, namely Dynamo and Astro. This integration, which happens both for the language used for expressing the properties to be monitored, and for the architecture of the monitoring framework, allows to combine the advantages of the two approaches and to obtain a general, comprehensive solutions for BPEL monitoring
In this paper we report the experience of using semantic based tools and technologies for (collaboratively) modeling administrative procedures and their related documents, organizational roles, and services, in the Italian Public Administration (PA), focusing in particular on the interoperability aspects faced during the modelling process. This experience, the reported lessons learned and next steps identified, highlight the potential and criticality of using web 2.0 semantic technologies and tools to enhance participatory knowledge sharing, interoperability, and collaboration in the modeling of complex domains in the PA.
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