Regulating Orchestration in SOA-Based Systems

Under service-oriented architecture (SOA), servers (service providers) provide services to clients as well as other orchestrators, i.e. they are parts of several orchestrations. Due to different types of interaction, servers may have to operate concurrently under several policies. Moreover, when interacting with clients or peer servers, a server may be subject to global constraints determined by system authorities, e.g. system administrator. In this paper, we present a framework to enforce multiple policies on server behavior with emphasis on server activities in orchestration. Our framework employs LGI-based middleware, and does not require any change of the conventional SOAP-based protocol, the UDDI server, the programs of servers and clients, or the BPEL engine employed by service orchestrators.