01: /*
02: * JBoss, Home of Professional Open Source.
03: * Copyright 2006, Red Hat Middleware LLC, and individual contributors
04: * as indicated by the @author tags. See the copyright.txt file in the
05: * distribution for a full listing of individual contributors.
06: *
07: * This is free software; you can redistribute it and/or modify it
08: * under the terms of the GNU Lesser General Public License as
09: * 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: import org.jboss.ha.framework.interfaces.HAPartition;
25: import org.jboss.ha.framework.server.ClusterPartition;
26: import org.jboss.logging.Logger;
27: import org.jboss.system.ServiceMBeanSupport;
28:
29: /**
30: * A base class for policy service that decides which node in the cluster should be
31: * the master node to run certain HASingleton service.
32: *
33: * @author <a href="mailto:afu@novell.com">Alex Fu</a>
34: * @version $Revision: 46010 $
35: */
36: public abstract class HASingletonElectionPolicyBase extends
37: ServiceMBeanSupport implements HASingletonElectionPolicyMBean {
38: private Object mManagedSingleton;
39: private HAPartition mPartition;
40:
41: /**
42: * @see HASingletonElectionPolicyMBean#setManagedSingleton(Object)
43: */
44: public void setManagedSingleton(Object singleton) {
45: this .mManagedSingleton = singleton;
46: }
47:
48: /**
49: * @see HASingletonElectionPolicyMBean#getManagedSingleton()
50: */
51: public Object getManagedSingleton() {
52: return this .mManagedSingleton;
53: }
54:
55: /**
56: * @see HASingletonElectionPolicyMBean#setHAPartition(HAPartition)
57: */
58: public void setHAPartition(HAPartition partition) {
59: this .mPartition = partition;
60: }
61:
62: /**
63: * @see HASingletonElectionPolicyMBean#getHAPartition()
64: */
65: public HAPartition getHAPartition() {
66: return this .mPartition;
67: }
68:
69: /**
70: * @see HASingletonElectionPolicyMBean#isElectedMaster()
71: */
72: public boolean isElectedMaster() {
73: if (null == this .mPartition)
74: throw new IllegalStateException("HAPartition is not set");
75:
76: return pickSingleton().equals(this .mPartition.getClusterNode());
77: }
78:
79: /**
80: * @see HASingletonElectionPolicyMBean#isElectedMaster(HAPartition)
81: */
82: public boolean isElectedMaster(HAPartition partition) {
83: if (null == partition)
84: throw new IllegalStateException("parameter cannot be null");
85:
86: return pickSingleton(partition).equals(
87: partition.getClusterNode());
88: }
89: }
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