/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.nifi.admin.service.transaction.impl;
import org.apache.nifi.admin.RepositoryUtils;
import org.apache.nifi.admin.dao.DAOFactory;
import org.apache.nifi.admin.dao.impl.DAOFactoryImpl;
import org.apache.nifi.admin.service.action.AdministrationAction;
import org.apache.nifi.admin.service.transaction.Transaction;
import org.apache.nifi.admin.service.transaction.TransactionException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.sql.Connection;
import java.sql.SQLException;
/**
* Transaction implementation that uses the specified SQL Connection and
* AuthorityProvider.
*/
public class StandardTransaction implements Transaction {
private static final Logger logger = LoggerFactory.getLogger(StandardTransaction.class);
private Connection connection;
public StandardTransaction(Connection connection) {
this.connection = connection;
}
@Override
public <T> T execute(AdministrationAction<T> action) {
// ensure the transaction has been started
if (connection == null) {
throw new IllegalStateException("This transaction is not active.");
}
// create a dao factory
DAOFactory daoFactory = new DAOFactoryImpl(connection);
// execute the specified action
return action.execute(daoFactory);
}
@Override
public void commit() throws TransactionException {
// ensure there is an active transaction
if (connection == null) {
throw new IllegalStateException("No active transaction.");
}
try {
// commit the transaction
connection.commit();
} catch (SQLException sqle) {
throw new TransactionException(sqle.getMessage());
}
}
@Override
public void rollback() {
// ensure there is an active transaction
if (connection != null) {
// rollback the transaction
RepositoryUtils.rollback(connection, logger);
}
}
@Override
public void close() throws IOException {
if (connection != null) {
RepositoryUtils.closeQuietly(connection);
connection = null;
}
}
}