Commons DBCP example source code file (ManagedDataSource.java)

This example Commons DBCP source code file (ManagedDataSource.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Commons DBCP tags/keywords

connection, connection, illegalstateexception, illegalstateexception, jdbc, managedconnection, manageddatasource, manageddatasource, nullpointerexception, pool, poolingdatasource, sql, sqlexception, transactionregistry, transactionregistry

The Commons DBCP ManagedDataSource.java source code

/**
 *
 * 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;
    }
}