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Java > Open Source Codes > org > jboss > ha > singleton > HASingleton


1 /*
2  * JBoss, Home of Professional Open Source
3  * Copyright 2005, JBoss Inc., and individual contributors as indicated
4  * by the @authors tag. See the copyright.txt in the distribution for a
5  * full listing of individual contributors.
6  *
7  * This is free software; you can redistribute it and/or modify it
8  * under the terms of the GNU Lesser General Public License as
9  * published by the Free Software Foundation; either version 2.1 of
10  * the License, or (at your option) any later version.
11  *
12  * This software is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with this software; if not, write to the Free
19  * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20  * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
21  */
22 package org.jboss.ha.singleton;
23
24 /**
25  * Basic interface for clustered singleton services
26  *
27  * @author Ivelin Ivanov <ivelin@apache.org>
28  * @version $Revision: 39540 $
29  */
30 public interface HASingleton
31 {
32    /**
33     * Invoked when this mbean is elected to run the singleton service,
34     * or in other words when this node is elected for master.
35     */
36    void startSingleton();
37
38    /**
39     * Invoked when this mbean is elected to no longer run the singleton service,
40     * or in other words when this node is elected for slave.
41     */
42    void stopSingleton();
43
44 }
45
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