ReoService: Coordination Modeling Tool

摘要

Coordination in SOA addresses dynamic topologies of interactions among services. Most efforts up to now have been focused on statically defined compositionof services, e.g., using BPEL. To the best of our knowledge, there are no serious means to address the issues of dynamic coordination to accommodate continuously changing requirements. While BPEL is a powerful standard for service composition, it lacks support for typical coordination constraints, like synchronisation, mutual exclusion, and context-dependency.In this paper we present ReoService, which is a modeling tool for coordinating business processes. ReoService is based on Reo [2] - a general framework for coordinating components in distributed systems. Reo is a channel-based exogenous coordination language wherein complex coordinators, called connectors, are compositionally built out of simpler ones. The simplest connectors are a set of user-defined communication channels with well-defined behavior. The emphasis in this model is on connectors, not on the services to connect. In this sense, ReoService acts as a "glue" language that interconnects and coordinates services in a distributed business process.