An Approach to Event Driven Services and Composite Services

This paper presents a reference model for Event Driven Composite Services, shows how such a model can be used as a basis to design a Service Creation Platform and a Service Execution Platform and describes an example of a Composite Service that takes advantage of the model and of the platforms. The Event Driven Service Composition paradigm supports the design and the implementation of distributed applications in environments in which the services to be composed interact with external components that generate asynchronous events, as it happens, for example, in telecommunication, in factory automation, in resource monitoring, in social community interactions, in finance/administration and in many others cases. The approach proposed is in the direction of enabling people with no programming skills to design and implement services over networks, thus contributing to the diffusion of an active role of the users in service provisioning.