001/*
002 * HA-JDBC: High-Availability JDBC
003 * Copyright (c) 2004-2007 Paul Ferraro
004 * 
005 * This library is free software; you can redistribute it and/or modify it 
006 * under the terms of the GNU Lesser General Public License as published by the 
007 * Free Software Foundation; either version 2.1 of the License, or (at your 
008 * option) any later version.
009 * 
010 * This library is distributed in the hope that it will be useful, but WITHOUT
011 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 
012 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License 
013 * for more details.
014 * 
015 * You should have received a copy of the GNU Lesser General Public License
016 * along with this library; if not, write to the Free Software Foundation, 
017 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
018 * 
019 * Contact: ferraro@users.sourceforge.net
020 */
021package net.sf.hajdbc.distributable;
022
023import java.util.Map;
024import java.util.concurrent.TimeUnit;
025import java.util.concurrent.locks.Lock;
026
027import org.jgroups.Address;
028
029import net.sf.hajdbc.LockManager;
030
031/**
032 * @author Paul Ferraro
033 * @since 2.0
034 */
035public class AcquireLockDecree extends AbstractLockDecree
036{
037        private static final long serialVersionUID = 9016576896686385467L;
038
039        public AcquireLockDecree()
040        {
041                super();
042        }
043
044        public AcquireLockDecree(String id, Address address)
045        {
046                super(id, address);
047        }
048
049        /**
050         * @see net.sf.hajdbc.distributable.LockDecree#vote(net.sf.hajdbc.LockManager, java.util.Map)
051         */
052        @Override
053        public boolean vote(LockManager lockManager, Map<String, Lock> lockMap)
054        {
055                Lock lock = lockManager.writeLock(this.id);
056                
057                try
058                {
059                        boolean locked = lock.tryLock(0, TimeUnit.SECONDS);
060                        
061                        if (locked)
062                        {
063                                synchronized (lockMap)
064                                {
065                                        lockMap.put(this.id, lock);
066                                }
067                        }
068                        
069                        return locked;
070                }
071                catch (InterruptedException e)
072                {
073                        return false;
074                }
075        }
076}