Index: lams_tool_nb/src/java/org/lamsfoundation/lams/tool/noticeboard/dao/hibernate/NoticeboardUserDAO.java
===================================================================
diff -u -rd3052fb70e4f634f28056bea13f91d9b8fd41b4c -r7a3020549c35733eee27e1231408b085b2b301e7
--- lams_tool_nb/src/java/org/lamsfoundation/lams/tool/noticeboard/dao/hibernate/NoticeboardUserDAO.java	(.../NoticeboardUserDAO.java)	(revision d3052fb70e4f634f28056bea13f91d9b8fd41b4c)
+++ lams_tool_nb/src/java/org/lamsfoundation/lams/tool/noticeboard/dao/hibernate/NoticeboardUserDAO.java	(.../NoticeboardUserDAO.java)	(revision 7a3020549c35733eee27e1231408b085b2b301e7)
@@ -29,11 +29,16 @@
 import org.lamsfoundation.lams.tool.noticeboard.dao.INoticeboardUserDAO;
 import org.lamsfoundation.lams.tool.noticeboard.NoticeboardUser;
 import org.springframework.orm.hibernate.support.HibernateDaoSupport;
+import org.lamsfoundation.lams.tool.noticeboard.NoticeboardSession;
+
 /**
  * @author mtruong
  */
 public class NoticeboardUserDAO extends HibernateDaoSupport implements INoticeboardUserDAO {
     
+    private static final String COUNT_USERS_IN_SESSION = "select nu.userId from NoticeboardUser nu where nu.nbSession= :nbSession";
+  
+    
     /**
 	 * <p>Return the persistent instance of a NoticeboardUser 
 	 * with the given identifier <code>uid</code>, returns null if not found. </p>
@@ -117,5 +122,19 @@
         this.getHibernateTemplate().delete(nbUser);
     }
     
+    /**
+     * Returns the number of users that are in this particular
+     * session.
+     * 
+     * @param nbSession
+     * @return the number of users that are in this session
+     */
+    public int getNumberOfUsers(NoticeboardSession nbSession)
+    {
+        return (getHibernateTemplate().findByNamedParam(COUNT_USERS_IN_SESSION,
+	            "nbSession",
+				nbSession)).size();
+    }
     
+    
 }