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/*
* Copyright 2008-2012 Amazon Technologies, Inc. or its affiliates.
* Amazon, Amazon.com and Carbonado are trademarks or registered trademarks
* of Amazon Technologies, Inc. or its affiliates. All rights reserved.
*
* 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 com.amazon.carbonado.repo.map;
import java.util.concurrent.TimeUnit;
import com.amazon.carbonado.IsolationLevel;
import com.amazon.carbonado.PersistException;
import com.amazon.carbonado.Transaction;
import com.amazon.carbonado.txn.TransactionManager;
/**
*
*
* @author Brian S O'Neill
*/
class MapTransactionManager extends TransactionManager<MapTransaction> {
private final int mLockTimeout;
private final TimeUnit mLockTimeoutUnit;
MapTransactionManager(int lockTimeout, TimeUnit lockTimeoutUnit) {
mLockTimeout = lockTimeout;
mLockTimeoutUnit = lockTimeoutUnit;
}
@Override
protected IsolationLevel selectIsolationLevel(Transaction parent, IsolationLevel level) {
if (level == null) {
if (parent == null) {
return IsolationLevel.READ_COMMITTED;
}
return parent.getIsolationLevel();
}
switch (level) {
case NONE:
return IsolationLevel.NONE;
case READ_UNCOMMITTED:
case READ_COMMITTED:
return IsolationLevel.READ_COMMITTED;
case REPEATABLE_READ:
case SERIALIZABLE:
return IsolationLevel.SERIALIZABLE;
default:
// Not supported.
return null;
}
}
@Override
protected boolean supportsForUpdate() {
return true;
}
@Override
protected MapTransaction createTxn(MapTransaction parent, IsolationLevel level)
throws Exception
{
if (level == IsolationLevel.NONE) {
return null;
}
return new MapTransaction(parent, level, mLockTimeout, mLockTimeoutUnit);
}
@Override
protected MapTransaction createTxn(MapTransaction parent, IsolationLevel level,
int timeout, TimeUnit unit)
throws Exception
{
if (level == IsolationLevel.NONE) {
return null;
}
return new MapTransaction(parent, level, timeout, unit);
}
@Override
protected boolean commitTxn(MapTransaction txn) throws PersistException {
txn.commit();
return false;
}
@Override
protected void abortTxn(MapTransaction txn) throws PersistException {
txn.abort();
}
}
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