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Commons Database Connection Pooling (See PATCHES.TXT in jar)
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/**
 *
 * 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.commons.dbcp.managed;

import org.apache.commons.pool.ObjectPool;
import org.apache.commons.dbcp.PoolingDataSource;

import java.sql.Connection;
import java.sql.SQLException;

/**
 * The ManagedDataSource is a PoolingDataSource that creates ManagedConnections.
 *
 * @author Dain Sundstrom
 * @version $Revision$
 */
public class ManagedDataSource extends PoolingDataSource {
    private TransactionRegistry transactionRegistry;

    /**
     * Creates an uninitialized datasource.  Before this data source can be used a pool and
     * transaction registry must be set.
     */
    public ManagedDataSource() {
    }

    /**
     * Creates a ManagedDataSource which obtains connections from the specified pool and
     * manages them using the specified transaction registry.  The TransactionRegistry must
     * be the transaction registry obtained from the XAConnectionFactory used to create
     * the connection pool.  If not an error will occure when attempting to use the connection
     * in a global transaction because the XAResource object associated with the connection
     * will be unavailable.
     *
     * @param pool the connection pool
     * @param transactionRegistry the transaction registry obtained from the
     * XAConnectionFactory used to create the connection pool object factory
     */
    public ManagedDataSource(ObjectPool pool, TransactionRegistry transactionRegistry) {
        super(pool);
        this.transactionRegistry = transactionRegistry;
    }

    /**
     * Sets the transaction registry from the XAConnectionFactory used to create the pool.
     * The transaction registry can only be set once using either a connector or this setter
     * method.
     * @param transactionRegistry the transaction registry acquired from the XAConnectionFactory
     * used to create the pool
     */
    public void setTransactionRegistry(TransactionRegistry transactionRegistry) {
        if(this.transactionRegistry != null) throw new IllegalStateException("TransactionRegistry already set");
        if(transactionRegistry == null) throw new NullPointerException("TransactionRegistry is null");

        this.transactionRegistry = transactionRegistry;
    }

    public Connection getConnection() throws SQLException {
        if (_pool == null) throw new IllegalStateException("Pool has not been set");
        if (transactionRegistry == null) throw new IllegalStateException("TransactionRegistry has not been set");

        Connection connection = new ManagedConnection(_pool, transactionRegistry, isAccessToUnderlyingConnectionAllowed());
        return connection;
    }
}