edu.uga.cs.fluxbuster.db.DBInterfaceFactory.java Source code

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Here is the source code for edu.uga.cs.fluxbuster.db.DBInterfaceFactory.java

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/*
* Copyright (C) 2012 Chris Neasbitt
* Author: Chris Neasbitt
*
* 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 2 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 edu.uga.cs.fluxbuster.db;

import java.io.IOException;
import java.lang.reflect.Constructor;
import java.util.Properties;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.jolbox.bonecp.BoneCP;
import com.jolbox.bonecp.BoneCPConfig;

import edu.uga.cs.fluxbuster.utils.PropertiesUtils;

/**
 * A factory for creating DBInterface objects based on a configured properties.
 * 
 * @author Chris Neasbitt
 */
public final class DBInterfaceFactory {

    private static Properties properties = null;

    @SuppressWarnings("rawtypes")
    private static Class dbifaceClass = null;

    private static final String DBCLASSKEY = "DBINTERFACE_CLASS";

    private static final String DBDRIVERKEY = "DBINTERFACE_DRIVER";

    private static final String DBCONNECTKEY = "DBINTERFACE_CONNECTINFO";

    private static final String DBPARTKEY = "DBINTERFACE_PARTITIONS";

    private static final String DBMINCONKEY = "DBINTERFACE_MIN_CON_PER_PART";

    private static final String DBMAXCONKEY = "DBINTERFACE_MAX_CON_PER_PART";

    private static final String DBRETRYATTEMPTSKEY = "DBINTERFACE_RETRY_ATTEMPTS";

    private static final String DBRETRYDELAYKEY = "DBINTERFACE_RETRY_DELAY";

    private static BoneCP connectionPool = null;

    private static Log log = LogFactory.getLog(DBInterfaceFactory.class);

    /**
     * Instantiates a new database interface factory.
     */
    private DBInterfaceFactory() {
    }

    /**
     * Load properties.
     *
     * @throws IOException if the properties file can not be loaded.
     */
    private static void loadProperties() throws IOException {
        if (properties == null) {
            properties = PropertiesUtils.loadAppWideProperties();
        }
    }

    /**
     * Initializes the factory.  This must be called once before use.
     * 
     * @throws Exception if an error occurs initializing the factory
     */
    public static void init() throws Exception {
        loadProperties();
        DBInterfaceFactory.init(properties.getProperty(DBCONNECTKEY), properties.getProperty(DBCLASSKEY),
                properties.getProperty(DBDRIVERKEY));
    }

    /**
     * Initializes the factory with the supplied jdbc url and 
     * DBInterface implementation.  This must be called once before use.
     * 
     * @param dbconnect the JDBC url to use in creating connections
     * @param dbclassname the full class name of the DBInterface implementation
     * @param dbdriver the full class name of the JDBC driver
     * @throws Exception if an error occurs initializing the factory
     */
    public static void init(String dbconnect, String dbclassname, String dbdriver) throws Exception {
        loadProperties();
        if (connectionPool == null) {
            dbifaceClass = Class.forName(dbclassname);
            Class.forName(dbdriver);
            BoneCPConfig config = new BoneCPConfig();
            config.setJdbcUrl(dbconnect);
            config.setMinConnectionsPerPartition(Integer.parseInt(properties.getProperty(DBMINCONKEY)));
            config.setMaxConnectionsPerPartition(Integer.parseInt(properties.getProperty(DBMAXCONKEY)));
            config.setAcquireRetryAttempts(Integer.parseInt(properties.getProperty(DBRETRYATTEMPTSKEY)));
            config.setAcquireRetryDelayInMs(Long.parseLong(properties.getProperty(DBRETRYDELAYKEY)));
            config.setLogStatementsEnabled(true);
            config.setPartitionCount(Integer.parseInt(properties.getProperty(DBPARTKEY)));
            connectionPool = new BoneCP(config);
        }
    }

    /**
     * 
     */
    public static void shutdown() {
        if (connectionPool != null) {
            connectionPool.shutdown();
        }
    }

    /**
     * Creates a database interface.
     *
     * @return the database interface
     */
    @SuppressWarnings("rawtypes")
    public static DBInterface loadDBInterface() {
        DBInterface retval = null;
        try {
            DBInterfaceFactory.init();

            Constructor[] constructors = dbifaceClass.getConstructors();
            Constructor con = null;
            for (Constructor constructor : constructors) {
                Class[] paramtypes = constructor.getParameterTypes();
                if (paramtypes.length == 1 && paramtypes[0].isInstance(DBInterfaceFactory.connectionPool)) {
                    con = constructor;
                }
            }
            Object obj = con.newInstance(DBInterfaceFactory.connectionPool);
            retval = (DBInterface) obj;
        } catch (Exception e) {
            if (log.isErrorEnabled()) {
                log.error("Error loading db interface.", e);
            }
        }
        return retval;
    }
}