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1   /*
2    * Copyright (C) 2013 4th Line GmbH, Switzerland
3    *
4    * The contents of this file are subject to the terms of either the GNU
5    * Lesser General Public License Version 2 or later ("LGPL") or the
6    * Common Development and Distribution License Version 1 or later
7    * ("CDDL") (collectively, the "License"). You may not use this file
8    * except in compliance with the License. See LICENSE.txt for more
9    * information.
10   *
11   * This program is distributed in the hope that it will be useful,
12   * but WITHOUT ANY WARRANTY; without even the implied warranty of
13   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
14   */
15  
16  package org.fourthline.cling.support.lastchange;
17  
18  import org.fourthline.cling.model.types.UnsignedIntegerFourBytes;
19  
20  /**
21   * Any service implementation using the "LastChange" mechanism.
22   * <p>
23   * Required by the {@link LastChangeAwareServiceManager} to handle state readouts
24   * of "LastChange"-using services for initial events GENA subscriptions. If you
25   * want a specification compliant <em>AVTransport</em> or <em>RenderingControl</em>
26   * UPnP service, your service implementation should implement this interface as well.
27   * </p>
28   *
29   * @author Christian Bauer
30   */
31  public interface LastChangeDelegator {
32  
33      public LastChange getLastChange();
34  
35      public void appendCurrentState(LastChange lc, UnsignedIntegerFourBytes instanceId) throws Exception;
36  
37      public abstract UnsignedIntegerFourBytes[] getCurrentInstanceIds();
38  
39  
40  }