package org.apache.ojb.otm.lock;
/* Copyright 2003-2004 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.metadata.ClassDescriptor;
import org.apache.ojb.broker.locking.IsolationLevels;
import org.apache.ojb.broker.PersistenceBroker;
import org.apache.ojb.otm.lock.isolation.ReadCommittedIsolation;
import org.apache.ojb.otm.lock.isolation.ReadUncommittedIsolation;
import org.apache.ojb.otm.lock.isolation.RepeatableReadIsolation;
import org.apache.ojb.otm.lock.isolation.SerializableIsolation;
import org.apache.ojb.otm.lock.isolation.TransactionIsolation;
/**
*
* <javadoc>
*
* @author <a href="mailto:rraghuram@hotmail.com">Raghu Rajah</a>
*
*/
public class IsolationFactory
{
private static final TransactionIsolation READ_UNCOMMITTED_ISOLATION
= new ReadUncommittedIsolation();
private static final TransactionIsolation READ_COMMITTED_ISOLATION
= new ReadCommittedIsolation();
private static final TransactionIsolation REPEATABLE_READ_ISOLATION
= new RepeatableReadIsolation();
private static final TransactionIsolation SERIALIZABLE_ISOLATION
= new SerializableIsolation();
/**
*
* Fetches the isolation level of given class from its ClassDescriptor.
*
*/
public static TransactionIsolation getIsolationLevel (PersistenceBroker pb,
ObjectLock lock)
{
/*
arminw: use real object class instead of top-level class
to match isolation level of given class
*/
// Class clazz = lock.getTargetIdentity().getObjectsTopLevelClass();
Class clazz = lock.getTargetIdentity().getObjectsRealClass();
ClassDescriptor classDescriptor = pb.getClassDescriptor(clazz);
int isolationLevel = classDescriptor.getIsolationLevel();
TransactionIsolation isolation = null;
switch (isolationLevel) {
case IsolationLevels.IL_READ_UNCOMMITTED:
isolation = READ_UNCOMMITTED_ISOLATION;
break;
case IsolationLevels.IL_READ_COMMITTED:
isolation = READ_COMMITTED_ISOLATION;
break;
case IsolationLevels.IL_REPEATABLE_READ:
isolation = REPEATABLE_READ_ISOLATION;
break;
case IsolationLevels.IL_SERIALIZABLE:
isolation = SERIALIZABLE_ISOLATION;
break;
default:
throw new UnknownIsolationException(
"Isolation level " + isolationLevel + " is not supported");
}
return isolation;
}
}