An Agent stands in between the Gateway and the Security Domain were partner application reside.
It provides transparent security context to partner applications, providing user and role information
by invoking the gateway through JAAS.
author: Gianluca Brigandi version: CVS $Id: SSOAgent.java 508 2008-02-18 13:32:29Z sgonzalez $
Obtains the principal associated with the given SSO id
Parameters: request - with the JOSSO Single Sign-On Session Identifier the principal associated with the given session identifier