ingo@307: package de.intevation.flys.artifacts.context;
ingo@307: 
ingo@307: import org.apache.log4j.Logger;
ingo@307: 
ingo@307: import org.hibernate.Session;
ingo@307: import org.hibernate.SessionFactory;
ingo@307: 
ingo@307: import de.intevation.flys.backend.SessionFactoryProvider;
ingo@307: 
ingo@307: import de.intevation.artifacts.CallContext;
ingo@307: import de.intevation.artifacts.CallContext.Listener;
ingo@307: 
ingo@307: 
ingo@307: /**
ingo@307:  * This CallContextListener is used to initialize a ThreadLocal variable in
ingo@307:  * each CallContext (for each request) that holds Sessions.
ingo@307:  *
ingo@307:  * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
ingo@307:  */
ingo@307: public class SessionCallContextListener implements Listener {
ingo@307: 
ingo@307:     public static final String SESSION_HOLDER_KEY = "context.session.holder";
ingo@307: 
ingo@307:     /** The logger that is used in this class.*/
ingo@307:     private static Logger logger =
ingo@307:         Logger.getLogger(SessionCallContextListener.class);
ingo@307: 
ingo@307: 
ingo@307:     public SessionCallContextListener() {
ingo@307:     }
ingo@307: 
ingo@307: 
ingo@307:     /**
ingo@307:      * Initializes a ThreadLocal variable that is used to hold sessions.
ingo@307:      *
ingo@307:      * @param context The CallContext.
ingo@307:      */
ingo@307:     public void init(CallContext context) {
ingo@307:         logger.debug("SessionCallContextListener.init");
ingo@307: 
ingo@307:         ThreadLocal<Session> sessionHolder = new ThreadLocal<Session>();
ingo@307: 
ingo@307:         SessionFactory sessionFactory =
ingo@307:             SessionFactoryProvider.createSessionFactory();
ingo@307: 
ingo@307:         Session session = sessionFactory.openSession();
ingo@307: 
ingo@307:         sessionHolder.set(session);
ingo@307: 
ingo@307:         context.putContextValue(SESSION_HOLDER_KEY, sessionHolder);
ingo@307:     }
ingo@307: 
ingo@307: 
ingo@307:     /**
ingo@307:      * Closes open sessions of the ThreadLocal variable opened in init().
ingo@307:      *
ingo@307:      * @param context The CallContext.
ingo@307:      */
ingo@307:     public void close(CallContext context) {
ingo@307:         logger.debug("SessionCallContextListener.close");
ingo@307: 
ingo@307:         ThreadLocal<Session> sessionHolder = (ThreadLocal<Session>)
ingo@307:             context.getContextValue(SESSION_HOLDER_KEY);
ingo@307: 
ingo@307:         Session session = sessionHolder.get();
ingo@307: 
ingo@307:         session.close();
ingo@307:         sessionHolder.remove();
ingo@307:     }
ingo@307: }
ingo@307: // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :