1 /*
2 * Copyright (c) 2005 Regents of the University of California (Regents). Created
3 * by TELS, Graduate School of Education, University of California at Berkeley.
4 *
5 * This software is distributed under the GNU Lesser General Public License, v2.
6 *
7 * Permission is hereby granted, without written agreement and without license
8 * or royalty fees, to use, copy, modify, and distribute this software and its
9 * documentation for any purpose, provided that the above copyright notice and
10 * the following two paragraphs appear in all copies of this software.
11 *
12 * REGENTS SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
13 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
14 * PURPOSE. THE SOFTWAREAND ACCOMPANYING DOCUMENTATION, IF ANY, PROVIDED
15 * HEREUNDER IS PROVIDED "AS IS". REGENTS HAS NO OBLIGATION TO PROVIDE
16 * MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
17 *
18 * IN NO EVENT SHALL REGENTS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,
19 * SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS,
20 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
21 * REGENTS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
22 */
23 package net.sf.sail.core.beans.service;
24
25 import java.util.Collection;
26
27 import net.sf.sail.core.beans.event.SessionEventListener;
28 import net.sf.sail.core.entity.User;
29 import net.sf.sail.core.uuid.SessionUuid;
30
31 /**
32 * Service for learning content to command and query the whole learning session.
33 *
34 * @author turadg
35 *
36 */
37 public interface SessionService {
38
39 public void userRequestsTermination();
40
41 public void addSessionEventListener(SessionEventListener sel);
42
43 /**
44 * Who is at the computer right now
45 */
46 public Collection<User> getUsers();
47
48 public void addUser(User user);
49
50 public void removeUser(User user);
51
52 public SessionUuid getSessionId();
53
54 /**
55 * Return a session property.
56 *
57 * @param key
58 * name of session property
59 * @param def
60 * a default value
61 * @return
62 */
63 public String getProperty(String key, String def);
64 }