This book describes how to get started with using the Service Activator Toolkit (SAT).

An Introduction to the SAT Runtime: The Service Activator Toolkit (SAT) enables the development of service oriented OSGi bundle activators by making the registration of services and the acquisition of services easy.
SAT Runtime Software Architecture: The SAT runtime software architecture is built on top of the OSGi runtime software architecture. Since the SAT runtime is packaged as a bundle, it runs on the OSGi framework just like any other bundle.