001/**
002 *
003 * Licensed to the Apache Software Foundation (ASF) under one or more
004 * contributor license agreements.  See the NOTICE file distributed with
005 * this work for additional information regarding copyright ownership.
006 * The ASF licenses this file to You under the Apache License, Version 2.0
007 * (the "License"); you may not use this file except in compliance with
008 * the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 *  Unless required by applicable law or agreed to in writing, software
013 *  distributed under the License is distributed on an "AS IS" BASIS,
014 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 *  See the License for the specific language governing permissions and
016 *  limitations under the License.
017 */
018package org.apache.commons.dbcp2.managed;
019
020import org.apache.commons.pool2.ObjectPool;
021import org.apache.commons.dbcp2.PoolingDataSource;
022
023import java.sql.Connection;
024import java.sql.SQLException;
025import java.util.Objects;
026
027/**
028 * The ManagedDataSource is a PoolingDataSource that creates ManagedConnections.
029 *
030 * @param <C>
031 *            The kind of {@link Connection} to manage.
032 * @since 2.0
033 */
034public class ManagedDataSource<C extends Connection> extends PoolingDataSource<C> {
035    private TransactionRegistry transactionRegistry;
036
037    /**
038     * Creates a ManagedDataSource which obtains connections from the specified pool and manages them using the
039     * specified transaction registry. The TransactionRegistry must be the transaction registry obtained from the
040     * XAConnectionFactory used to create the connection pool. If not, an error will occur when attempting to use the
041     * connection in a global transaction because the XAResource object associated with the connection will be
042     * unavailable.
043     *
044     * @param pool
045     *            the connection pool
046     * @param transactionRegistry
047     *            the transaction registry obtained from the XAConnectionFactory used to create the connection pool
048     *            object factory
049     */
050    public ManagedDataSource(final ObjectPool<C> pool, final TransactionRegistry transactionRegistry) {
051        super(pool);
052        this.transactionRegistry = transactionRegistry;
053    }
054
055    /**
056     * Sets the transaction registry from the XAConnectionFactory used to create the pool. The transaction registry can
057     * only be set once using either a connector or this setter method.
058     *
059     * @param transactionRegistry
060     *            the transaction registry acquired from the XAConnectionFactory used to create the pool
061     */
062    public void setTransactionRegistry(final TransactionRegistry transactionRegistry) {
063        if (this.transactionRegistry != null) {
064            throw new IllegalStateException("TransactionRegistry already set");
065        }
066        Objects.requireNonNull(transactionRegistry, "transactionRegistry is null");
067
068        this.transactionRegistry = transactionRegistry;
069    }
070
071    @Override
072    public Connection getConnection() throws SQLException {
073        if (getPool() == null) {
074            throw new IllegalStateException("Pool has not been set");
075        }
076        if (transactionRegistry == null) {
077            throw new IllegalStateException("TransactionRegistry has not been set");
078        }
079
080        return new ManagedConnection<>(getPool(), transactionRegistry, isAccessToUnderlyingConnectionAllowed());
081    }
082}