teichmann@5831: package org.dive4elements.river.artifacts.context;
ingo@307: 
ingo@307: import org.apache.log4j.Logger;
ingo@307: 
ingo@310: import org.w3c.dom.Document;
ingo@310: import org.w3c.dom.Node;
ingo@310: 
ingo@307: import org.hibernate.Session;
ingo@307: 
teichmann@5831: import org.dive4elements.river.backend.SessionHolder;
ingo@315: 
teichmann@5831: import org.dive4elements.artifacts.CallContext;
teichmann@5831: import org.dive4elements.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: 
sascha@308:     public static final String SESSION_KEY = "context.session";
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@310:     public void setup(Document config, Node listenerConfig) {
ingo@310:         // nothing to do here
ingo@310:     }
ingo@310: 
ingo@310: 
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: 
sascha@308:         Session session = SessionHolder.acquire();
ingo@307: 
sascha@308:         context.putContextValue(SESSION_KEY, session);
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: 
sascha@308:         Session session = (Session)context.getContextValue(SESSION_KEY);
sascha@308:         session.close();
ingo@307: 
sascha@308:         SessionHolder.release();
ingo@307:     }
ingo@307: }
ingo@307: // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :