package org.apache.ojb.odmg.locking;
/* Copyright 2002-2005 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import org.apache.ojb.broker.Identity;
import org.apache.ojb.broker.locking.IsolationLevels;
import org.apache.ojb.broker.core.proxy.ProxyHelper;
import org.apache.ojb.broker.metadata.ClassDescriptor;
import org.apache.ojb.odmg.TransactionImpl;
/**
* The odmg lock manager implementation of the {@link LockManager} interface. This class
* using the OJB kernel locking api {@link org.apache.ojb.broker.locking.LockManager}
* to manage object locking.
*
* @author <a href="mailto:arminw@apache.org">Armin Waibel</a>
* @version $Id: LockManagerOdmgImpl.java,v 1.1.2.4 2005/12/21 22:29:51 tomdz Exp $
*/
public class LockManagerOdmgImpl implements LockManager
{
private org.apache.ojb.broker.locking.LockManager lm;
public LockManagerOdmgImpl(org.apache.ojb.broker.locking.LockManager lm)
{
this.lm = lm;
}
private boolean ignore(int isolationLevel)
{
return isolationLevel == IsolationLevels.IL_OPTIMISTIC || isolationLevel == IsolationLevels.IL_NONE;
}
public boolean readLock(TransactionImpl tx, Object obj)
{
Identity oid = tx.getBroker().serviceIdentity().buildIdentity(obj);
return readLock(tx, oid, obj);
}
public boolean readLock(TransactionImpl tx, Identity oid, Object obj)
{
ClassDescriptor cld = tx.getBroker().getClassDescriptor(ProxyHelper.getRealClass(obj));
int isolationLevel = cld.getIsolationLevel();
return ignore(isolationLevel) ? true : lm.readLock(tx.getGUID(), oid, isolationLevel);
}
public boolean writeLock(TransactionImpl tx, Object obj)
{
Identity oid = tx.getBroker().serviceIdentity().buildIdentity(obj);
return writeLock(tx, oid, obj);
}
public boolean writeLock(TransactionImpl tx, Identity oid, Object obj)
{
ClassDescriptor cld = tx.getBroker().getClassDescriptor(ProxyHelper.getRealClass(obj));
int isolationLevel = cld.getIsolationLevel();
return ignore(isolationLevel) ? true : lm.writeLock(tx.getGUID(), oid, isolationLevel);
}
public boolean upgradeLock(TransactionImpl tx, Object obj)
{
Identity oid = tx.getBroker().serviceIdentity().buildIdentity(obj);
return upgradeLock(tx, oid, obj);
}
public boolean upgradeLock(TransactionImpl tx, Identity oid, Object obj)
{
ClassDescriptor cld = tx.getBroker().getClassDescriptor(ProxyHelper.getRealClass(obj));
int isolationLevel = cld.getIsolationLevel();
return ignore(isolationLevel) ? true : lm.upgradeLock(tx.getGUID(), oid, isolationLevel);
}
public boolean releaseLock(TransactionImpl tx, Object obj)
{
Identity oid = tx.getBroker().serviceIdentity().buildIdentity(obj);
return releaseLock(tx, oid, obj);
}
public boolean releaseLock(TransactionImpl tx, Identity oid, Object obj)
{
return lm.releaseLock(tx.getGUID(), oid);
}
public boolean checkRead(TransactionImpl tx, Object obj)
{
Identity oid = tx.getBroker().serviceIdentity().buildIdentity(obj);
return checkRead(tx, oid, obj);
}
public boolean checkRead(TransactionImpl tx, Identity oid, Object obj)
{
return lm.hasRead(tx.getGUID(), oid);
}
public boolean checkWrite(TransactionImpl tx, Object obj)
{
Identity oid = tx.getBroker().serviceIdentity().buildIdentity(obj);
return checkWrite(tx, oid, obj);
}
public boolean checkWrite(TransactionImpl tx, Identity oid, Object obj)
{
return lm.hasWrite(tx.getGUID(), oid);
}
}