01: /*
02: * HA-JDBC: High-Availability JDBC
03: * Copyright (c) 2004-2007 Paul Ferraro
04: *
05: * This library is free software; you can redistribute it and/or modify it
06: * under the terms of the GNU Lesser General Public License as published by the
07: * Free Software Foundation; either version 2.1 of the License, or (at your
08: * option) any later version.
09: *
10: * This library is distributed in the hope that it will be useful, but WITHOUT
11: * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12: * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
13: * for more details.
14: *
15: * You should have received a copy of the GNU Lesser General Public License
16: * along with this library; if not, write to the Free Software Foundation,
17: * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18: *
19: * Contact: ferraro@users.sourceforge.net
20: */
21: package net.sf.hajdbc.distributable;
22:
23: import java.util.Map;
24: import java.util.concurrent.locks.Lock;
25:
26: import org.jgroups.Address;
27:
28: import net.sf.hajdbc.LockManager;
29:
30: /**
31: * @author Paul Ferraro
32: * @since 2.0
33: */
34: public class AcquireLockDecree extends AbstractLockDecree {
35: private static final long serialVersionUID = 9016576896686385467L;
36:
37: public AcquireLockDecree() {
38: super ();
39: }
40:
41: public AcquireLockDecree(String id, Address address) {
42: super (id, address);
43: }
44:
45: /**
46: * @see net.sf.hajdbc.distributable.LockDecree#vote(net.sf.hajdbc.LockManager, java.util.Map)
47: */
48: @Override
49: public boolean vote(LockManager lockManager,
50: Map<String, Lock> lockMap) {
51: Lock lock = lockManager.readLock(this .id);
52:
53: boolean locked = lock.tryLock();
54:
55: if (locked) {
56: synchronized (lockMap) {
57: lockMap.put(this.id, lock);
58: }
59: }
60:
61: return locked;
62: }
63: }
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