com.gramercysoftware.persistence.dao.GSPDataSourceFactory.java Source code

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Here is the source code for com.gramercysoftware.persistence.dao.GSPDataSourceFactory.java

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/*
 * Simple pooled DatSource Factory
 * Copyright (C) 2011 David Harcombe
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.gramercysoftware.persistence.dao;

import java.io.IOException;
import java.sql.Connection;
import java.text.MessageFormat;
import java.util.Properties;

import javax.sql.DataSource;

import org.apache.commons.dbcp.ConnectionFactory;
import org.apache.commons.dbcp.DriverManagerConnectionFactory;
import org.apache.commons.dbcp.PoolableConnectionFactory;
import org.apache.commons.dbcp.PoolingDataSource;
import org.apache.commons.pool.ObjectPool;
import org.apache.commons.pool.impl.GenericObjectPool;
import org.apache.log4j.Logger;

public class GSPDataSourceFactory {
    private static Logger logger = Logger.getLogger(GSPDataSourceFactory.class);
    private PoolingDataSource dataSource;
    private String propertyFileName;

    public GSPDataSourceFactory() {
    }

    public GSPDataSourceFactory(String propertyFileName) {
        this.propertyFileName = propertyFileName;
    }

    public DataSource getDataSource() {
        if (dataSource == null) {
            createDataSource();
        }

        return dataSource;
    }

    private void createDataSource() {
        Properties properties = getDataSourceConfig();
        initializeDatabaseDriver(properties);

        ObjectPool connectionPool = createConnectionPool(properties);
        ConnectionFactory connectionFactory = new DriverManagerConnectionFactory(properties.getProperty("jdbc.url"),
                properties.getProperty("jdbc.user"), properties.getProperty("jdbc.password"));
        new PoolableConnectionFactory(connectionFactory, connectionPool, null, null, false, true,
                Connection.TRANSACTION_SERIALIZABLE);
        dataSource = new PoolingDataSource(connectionPool);
    }

    private ObjectPool createConnectionPool(Properties properties) {
        GenericObjectPool.Config config = new GenericObjectPool.Config();
        config.maxActive = Integer.parseInt(properties.getProperty("pool.maxActive"));
        config.maxIdle = Integer.parseInt(properties.getProperty("pool.maxIdle"));
        config.minIdle = Integer.parseInt(properties.getProperty("pool.minIdle"));
        config.maxWait = Integer.parseInt(properties.getProperty("pool.maxWait"));

        ObjectPool connectionPool = new GenericObjectPool(null, config);
        return connectionPool;
    }

    private Properties getDataSourceConfig() {
        Properties properties = new Properties();
        try {
            properties.load(GSPDataSourceFactory.class.getResourceAsStream(getPropertyFileName()));
        } catch (IOException e) {
            logger.error(MessageFormat.format("Error loading property file {0}", getPropertyFileName()), e);
        }

        return properties;
    }

    private void initializeDatabaseDriver(Properties properties) {
        try {
            Class.forName(properties.getProperty("jdbc.driver"));
        } catch (ClassNotFoundException e) {
            logger.error(MessageFormat.format("Error initializing JDBC driver {0}",
                    properties.getProperty("jdbc.driver")), e);
        }
    }

    public String getPropertyFileName() {
        if (propertyFileName == null) {
            propertyFileName = GSPDataSourceFactory.class.getSimpleName();
        }
        return propertyFileName;
    }

    @Deprecated
    void setPropertyFileName(String propertyFileName) {
        this.propertyFileName = propertyFileName;
    }
}