/*
* JBoss, Home of Professional Open Source
* Copyright 2006, Red Hat Middleware LLC, and individual contributors
* as indicated by the @author tags.
* See the copyright.txt in the distribution for a
* full listing of individual contributors.
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License, v. 2.1.
* This program is distributed in the hope that it will be useful, but WITHOUT A
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
* PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public License,
* v.2.1 along with this distribution; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*
* (C) 2005-2006,
* @author JBoss Inc.
*/
/*
* Copyright (C) 1998, 1999, 2000, 2001,
*
* Arjuna Solutions Limited,
* Newcastle upon Tyne,
* Tyne and Wear,
* UK.
*
* $Id: BasicPersistentLockStore.java 2342 2006-03-30 13:06:17Z $
*/
package com.arjuna.ats.internal.txoj.lockstore;
import com.arjuna.ats.txoj.lockstore.LockStore;
import com.arjuna.ats.arjuna.objectstore.ObjectStore;
import com.arjuna.ats.txoj.common.txojPropertyManager;
import com.arjuna.ats.arjuna.common.Uid;
import com.arjuna.ats.arjuna.state.*;
import com.arjuna.ats.txoj.logging.txojLogger;
import com.arjuna.ats.txoj.logging.FacilityCode;
import com.arjuna.common.util.logging.*;
import com.arjuna.ats.arjuna.exceptions.ObjectStoreException;
import com.arjuna.ats.internal.arjuna.objectstore.ShadowingStore;
import com.arjuna.ats.txoj.exceptions.LockStoreException;
/**
* An implementation of the lock store which saves locks into files on the local
* machine. Thus, multiple JVMs may share locks by reading and writing to the
* same files.
*
* @author Mark Little (mark@arjuna.com)
* @version $Id: BasicPersistentLockStore.java 2342 2006-03-30 13:06:17Z $
* @since JTS 1.0.
*/
public class BasicPersistentLockStore extends LockStore
{
/*
* Ignore key as we can make use of the basic type information for this type
* of store. Really only need it for shared memory.
*/
public BasicPersistentLockStore(String key)
{
if (txojLogger.aitLogger.isDebugEnabled())
{
txojLogger.aitLogger.debug(DebugLevel.CONSTRUCTORS, VisibilityLevel.VIS_PUBLIC,
FacilityCode.FAC_LOCK_STORE, "BasicPersistentLockStore.BasicPersistentLockStore("+key+")");
}
lockStoreLocation = txojPropertyManager.getTxojEnvironmentBean()
.getLockStoreDir();
_key = txojPropertyManager.getTxojEnvironmentBean().getLockStoreDir();
/*
* Use the ShadowingStore since it has file-level locking which we
* require. The default object store assumes locking is provided
* entirely by the object.
*/
_lockStore = new ShadowingStore(_key);
}
public InputObjectState read_state (Uid u, String tName)
throws LockStoreException
{
if (txojLogger.aitLogger.isDebugEnabled())
{
txojLogger.aitLogger.debug(DebugLevel.FUNCTIONS, VisibilityLevel.VIS_PUBLIC,
FacilityCode.FAC_LOCK_STORE, "BasicPersistentLockStore.read_state("+u+", "+tName+")");
}
try
{
return _lockStore.read_committed(u, tName);
}
catch (ObjectStoreException e)
{
throw new LockStoreException("Persistent store error.", e);
}
}
public boolean remove_state (Uid u, String tName)
{
if (txojLogger.aitLogger.isDebugEnabled())
{
txojLogger.aitLogger.debug(DebugLevel.FUNCTIONS, VisibilityLevel.VIS_PUBLIC,
FacilityCode.FAC_LOCK_STORE, "BasicPersistentLockStore.remove_state("+u+", "+tName+")");
}
try
{
return _lockStore.remove_committed(u, tName);
}
catch (ObjectStoreException e)
{
return false;
}
}
public boolean write_committed (Uid u, String tName, OutputObjectState state)
{
if (txojLogger.aitLogger.isDebugEnabled())
{
txojLogger.aitLogger.debug(DebugLevel.FUNCTIONS, VisibilityLevel.VIS_PUBLIC,
FacilityCode.FAC_LOCK_STORE,
"BasicPersistentLockStore.write_committed("+u+", "+tName+", "+state+")");
}
try
{
return _lockStore.write_committed(u, tName, state);
}
catch (ObjectStoreException e)
{
return false;
}
}
private String _key;
private ObjectStore _lockStore;
private static String lockStoreLocation = null;
}