SessionManager object is used to create sessions that are active for a given time period. Each session is referenced using a unique key, and only one session exists per key at a time. Once a session has been created it remains active for a fixed time period, this time period is renewed each time that session is open. When the session manager is no longer required it can be closed. Closing the session manager will cancel and destroy all active sessions, and release all resources occupied by the provider such as threads and memory. Typically it is advisable to close a manager when it is not longer required by the application. @author Niall Gallagher
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