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/*
* Copyright 2006-2012 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.sleepycat;
import java.lang.ref.WeakReference;
import java.util.concurrent.TimeUnit;
import com.amazon.carbonado.IsolationLevel;
import com.amazon.carbonado.PersistException;
import com.amazon.carbonado.Transaction;
import com.amazon.carbonado.spi.ExceptionTransformer;
import com.amazon.carbonado.txn.TransactionManager;
/**
* This class is used for tracking transactions and open cursors.
*
* @author Brian S O'Neill
*/
class BDBTransactionManager<Txn> extends TransactionManager<Txn> {
private final ExceptionTransformer mExTransformer;
// Weakly reference repository because thread locals are not cleaned up
// very quickly and BDB environments hang on to a ton of memory.
private final WeakReference<BDBRepository<Txn>> mRepositoryRef;
BDBTransactionManager(ExceptionTransformer exTransformer, BDBRepository<Txn> repository) {
mExTransformer = exTransformer;
mRepositoryRef = new WeakReference<BDBRepository<Txn>>(repository);
}
@Override
protected IsolationLevel selectIsolationLevel(Transaction parent, IsolationLevel level) {
return repository().selectIsolationLevel(parent, level);
}
@Override
protected boolean supportsForUpdate() {
return true;
}
@Override
protected Txn createTxn(Txn parent, IsolationLevel level) throws Exception {
if (level == IsolationLevel.NONE) {
return null;
}
return repository().txn_begin(parent, level);
}
@Override
protected Txn createTxn(Txn parent, IsolationLevel level, int timeout, TimeUnit unit)
throws Exception
{
if (level == IsolationLevel.NONE) {
return null;
}
if (timeout == 0) {
return repository().txn_begin_nowait(parent, level);
} else {
return repository().txn_begin(parent, level, timeout, unit);
}
}
@Override
protected boolean commitTxn(Txn txn) throws PersistException {
try {
repository().txn_commit(txn);
return false;
} catch (Throwable e) {
throw mExTransformer.toPersistException(e);
}
}
@Override
protected void abortTxn(Txn txn) throws PersistException {
try {
repository().txn_abort(txn);
} catch (Throwable e) {
throw mExTransformer.toPersistException(e);
}
}
private BDBRepository<Txn> repository() {
BDBRepository<Txn> repo = mRepositoryRef.get();
if (repo == null) {
throw new IllegalStateException("Repository closed");
}
return repo;
}
}
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