/*
* Seldon -- open source prediction engine
* =======================================
*
* Copyright 2011-2015 Seldon Technologies Ltd and Rummble Ltd (http://www.seldon.io/)
*
* ********************************************************************************************
*
* 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.
*
* ********************************************************************************************
*/
package io.seldon.db.jdo;
import org.apache.log4j.Logger;
public class NestedTransactionCounter extends ThreadLocal {
private static Logger logger = Logger.getLogger( NestedTransactionCounter.class.getName() );
public int startTransaction()
{
Integer count = (Integer) super.get();
if (count == null)
count = new Integer(1);
else
count = new Integer(count + 1);
super.set(count);
return count;
}
public int endTransaction()
{
Integer count = (Integer) super.get();
if (count == null)
{
final String message = "Count is null on end transaction";
logger.error(message, new Exception(message));
count = 0;
}
else
count = new Integer(count -1);
if (count < 0)
{
final String message = "Count is less than zero " + count;
logger.error(message, new Exception(message));
count = 0;
}
super.set(count);
return count;
}
}