content: /*
   * Copyright (C) 2013 4th Line GmbH, Switzerland
   *
   * The contents of this file are subject to the terms of either the GNU
   * Lesser General Public License Version 2 or later ("LGPL") or the
   * Common Development and Distribution License Version 1 or later
   * ("CDDL") (collectively, the "License"). You may not use this file
   * except in compliance with the License. See LICENSE.txt for more
   * information.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
   */
  
  package org.fourthline.cling.support.lastchange;
  
  import org.fourthline.cling.model.types.UnsignedIntegerFourBytes;
  
  /**
   * Any service implementation using the "LastChange" mechanism.
   * <p>
   * Required by the {@link LastChangeAwareServiceManager} to handle state readouts
   * of "LastChange"-using services for initial events GENA subscriptions. If you
   * want a specification compliant <em>AVTransport</em> or <em>RenderingControl</em>
   * UPnP service, your service implementation should implement this interface as well.
   * </p>
   *
   * @author Christian Bauer
   */
  public interface LastChangeDelegator {
  
      public LastChange getLastChange();
  
      public void appendCurrentState(LastChange lc, UnsignedIntegerFourBytes instanceId) throws Exception;
  
      public abstract UnsignedIntegerFourBytes[] getCurrentInstanceIds();
  
  
  }
  