In this chapter, we considered our first request processing component—the Catalina engine. We looked at the containment hierarchy implemented by Tomcat and also reviewed the super class of all containers, the
ContainerBase. Each container is associated with a pipeline that aggregates the request processing functionality for that container. We walked through the
StandardPipeline, which is the default implementation of a pipeline. Finally, we considered the constituent parts of a pipeline, the
Valves. We looked at the base implementation,
ValveBase, and visited some of the key valve implementations. The valves that we explored included the
StandardEngineValve, which is the core request component for an
Engine, as well as some key general ...