Pattern Oriented Service Development for Coarse-Grained Service Reuse

Service-oriented software development is becoming a prominent paradigm by which web-based applications can be easily assembled and delivered much faster than traditional approaches. Existing service development methods have not addressed the issue of service reuse of varying levels of granularity yet. This paper introduces the concept of service component that packages together web services and choreography, and presents their operations and properties in a consistent and uniform manner. They are published externally as normal web services and can thus be employed by web-based applications. In order to improve reusability of service components, this paper also proposes the concept of composition pattern that presents the relationships among service components. The composition patterns support to integrate service components of varying levels of granularity.