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1   /*
2    * Copyright (c) 1998-2002 The Jgroup Team.
3    *
4    * This program is free software; you can redistribute it and/or modify
5    * it under the terms of the GNU Lesser General Public License version 2 as
6    * published by the Free Software Foundation.
7    *
8    * This program is distributed in the hope that it will be useful,
9    * but WITHOUT ANY WARRANTY; without even the implied warranty of
10   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11   * GNU Lesser General Public License for more details.
12   *
13   * You should have received a copy of the GNU Lesser General Public License
14   * along with this program; if not, write to the Free Software
15   * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
16   *
17   */
18  
19  package jgroup.upgrade;
20  
21  /**
22   *  The <code>UpgradeListener</code> is the interface that must be
23   *  implemented by application replicas that should be upgradeable.
24   *
25   *  @author Hein Meling
26   *  @since Jgroup 1.2
27   */
28  public interface UpgradeListener
29  {
30  
31    /**
32     *  Upcall method invoked on the application replica to inform it that
33     *  this replica has been upgraded, and it can terminate its current
34     *  execution. This method should only do application specific shutdown
35     *  procedures.
36     */
37    public void upgraded();
38  
39  }