GEMBus based services composition platform for cloud PaaS

Cloud Platform as a Service (PaaS) provides an environment for creating and deploying applications using one of popular development platforms. This paper presents a practical solution for building a service composition platform based on the GEMBus (GEANT Multi-domain Bus) that extends the industry accepted Enterprise Service Bus (ESB) platform with automated services composition functionality and core services to support federated network access to distributed applications and resources, primarily targeted for GEANT research and academic community. The ESB is widely used as a platform for SOA and Web Services based integrated enterprise solutions. However in existing practices ESB design is still based on manual development, configuration and integration. GEMBus with its extended functionality and orientation on distributed resources integration can be considered as a logical choice for creating cloud PaaS services composition and provisioning platform. The paper describes Composable Services Architecture that creates a basis for automated services composition and lifecycle management and explains how this can be implemented with GEMBus. The paper describes the combined GEMBus/ESB testbed and provides an example of the simple services composition.