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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.jdbc;
import java.lang.ref.WeakReference;
import java.sql.Connection;
import java.sql.SQLException;
import com.amazon.carbonado.FetchException;
import com.amazon.carbonado.IsolationLevel;
import com.amazon.carbonado.PersistException;
import com.amazon.carbonado.Transaction;
import com.amazon.carbonado.txn.TransactionManager;
/**
* Manages transactions for JDBCRepository.
*
* @author Brian S O'Neill
*/
class JDBCTransactionManager extends TransactionManager<JDBCTransaction> {
private final JDBCExceptionTransformer mExTransformer;
// Weakly reference repository because thread locals are not cleaned up
// very quickly.
private final WeakReference<JDBCRepository> mRepositoryRef;
JDBCTransactionManager(JDBCRepository repository) {
mExTransformer = repository.getExceptionTransformer();
mRepositoryRef = new WeakReference<JDBCRepository>(repository);
}
@Override
protected IsolationLevel selectIsolationLevel(Transaction parent, IsolationLevel level) {
JDBCRepository repo = mRepositoryRef.get();
if (repo == null) {
throw new IllegalStateException("Repository closed");
}
return repo.selectIsolationLevel(parent, level);
}
@Override
protected boolean supportsForUpdate() {
JDBCRepository repo = mRepositoryRef.get();
return repo != null && repo.supportsSelectForUpdate();
}
@Override
protected JDBCTransaction createTxn(JDBCTransaction parent, IsolationLevel level)
throws SQLException, FetchException
{
JDBCRepository repo = mRepositoryRef.get();
if (repo == null) {
throw new IllegalStateException("Repository closed");
}
if (parent != null) {
if (!repo.supportsSavepoints()) {
// No support for nested transactions, so fake it.
return parent;
}
return new JDBCTransaction(parent, level);
}
return new JDBCTransaction(repo.getConnectionForTxn(level));
}
@Override
protected void reuseTxn(JDBCTransaction txn) throws SQLException {
txn.reuse();
}
@Override
protected boolean commitTxn(JDBCTransaction txn) throws PersistException {
try {
txn.commit();
return true;
} catch (Throwable e) {
throw mExTransformer.toPersistException(e);
}
}
@Override
protected void abortTxn(JDBCTransaction txn) throws PersistException {
PersistException ex = null;
try {
txn.abort();
} catch (Throwable e) {
ex = mExTransformer.toPersistException(e);
throw ex;
} finally {
try {
if (txn.shouldCloseConnection()) {
Connection con = txn.getConnection();
JDBCRepository repo = mRepositoryRef.get();
if (repo == null) {
con.close();
} else {
repo.closeConnection(con);
}
}
} catch (Throwable e) {
// Don't lose the original exception.
if (ex == null) {
throw mExTransformer.toPersistException(e);
}
}
}
}
}
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