/*
* 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.drill.jdbc;
import java.sql.Connection;
import java.sql.SQLException;
/**
* A connection factory that creates and caches a single connection instance.
*
* <p>
* Not thread safe.
* </p>
*/
public class SingleConnectionCachingFactory implements CachingConnectionFactory {
private final ConnectionFactory delegate;
private Connection connection;
public SingleConnectionCachingFactory(ConnectionFactory delegate) {
this.delegate = delegate;
}
/**
* {@inheritDoc}
* <p>
* For this implementation, calls to {@code createConnection} without any
* intervening calls to {@link #closeConnections} return the same Connection
* instance.
* </p>
*/
@Override
public Connection getConnection(ConnectionInfo info) throws SQLException {
if (connection == null) {
connection = delegate.getConnection(info);
} else {
JdbcTestBase.changeSchemaIfSupplied(connection, info.getParamsAsProperties());
}
return new NonClosableConnection(connection);
}
@Override
public void closeConnections() throws SQLException {
if (connection != null) {
connection.close();
connection = null;
}
}
}