Tomcat's Session Manager provides more storage Session persistence scheme, often use high-performance storage mode, such as the Redis, and clustered to the embodiment, to prevent single points of failure, so as to enhance availability. At the same time, Session has expired time, so Tomcat will open a background thread periodically polling, if Session expired Session will fail.
Connector for shielded container Servlet protocol differences and I / O models, either HTTP or AJP, acquired in the container is a standard ServletRequest object
But the overall processing logic is constant, Endpoint responsible for providing a stream of bytes to the Processor, Processor is responsible for providing Tomcat Request object to the Adapter, Adapter responsible for providing the object to the container ServletRequest
Engine Host Context Wrapper
