This figure shows the architecture of a Decision service. In the center is the Rules Engine. On the left of the Rules Engine are Decision services 1, 2, 3, and N. Each exchanges requests with the Rules Engine. On the right of the Rules Engine are Decision Component Metadata, Stateless Rule Session Pool, and Stateful Rule Session Cache. Each exchanges information with the Rules Engine. The Stateless Rule Session Pool and Stateful Rule Session Cache access Deployment Artifacts (such as generated JAXB classes).