sharedpooldatasourcefactory.java

torque服务器源代码

package org.apache.torque.dsfactory;

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import javax.sql.ConnectionPoolDataSource;
import javax.sql.DataSource;

import org.apache.commons.configuration.Configuration;

import org.apache.commons.dbcp.datasources.SharedPoolDataSource;

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

import org.apache.torque.Torque;
import org.apache.torque.TorqueException;

/**
 * A factory that looks up the DataSource using the JDBC2 pool methods.
 *
 * @author <a href="mailto:[e-mail]">John McNally</a>
 * @author <a href="mailto:[e-mail]">Henning P. Schmiedehausen</a>
 * @version $Id: SharedPoolDataSourceFactory.java,v 1.1 2003/08/19 19:09:12 mpoeschl Exp $
 */
public class SharedPoolDataSourceFactory
    extends AbstractDataSourceFactory
    implements DataSourceFactory
{

    /** The log. */
    private static Log log 
            = LogFactory.getLog(SharedPoolDataSourceFactory.class);

    /** The wrapped <code>DataSource</code>. */
    private DataSource ds;

    /**
     * @see org.apache.torque.dsfactory.DataSourceFactory#getDataSource
     */
    public DataSource getDataSource()
    {
        return ds;
    }

    /**
     * @see org.apache.torque.dsfactory.DataSourceFactory#initialize
     */
    public void initialize(Configuration configuration) throws TorqueException
    {
        if (configuration == null)
        {
            throw new TorqueException(
                "Torque cannot be initialized without a valid configuration. "
                + "Please check the log files for further details.");
        }

        ConnectionPoolDataSource cpds = initCPDS(configuration);
        SharedPoolDataSource ds = initJdbc2Pool(configuration);
        ds.setConnectionPoolDataSource(cpds);
        this.ds = ds;
    }

    /**
     * Initializes the Jdbc2PoolDataSource.
     *
     * @param configuration where to read the settings from
     * @throws TorqueException if a property set fails
     * @return a configured <code>Jdbc2PoolDataSource</code>
     */
    private SharedPoolDataSource initJdbc2Pool(Configuration configuration)
        throws TorqueException
    {
        log.debug("Starting initJdbc2Pool");
        SharedPoolDataSource ds = new SharedPoolDataSource();
        Configuration c = Torque.getConfiguration();

        if (c == null)
        {
            log.warn("Global Configuration not set,"
                    + " no Default pool data source configured!");
        }
        else
        {
            Configuration conf = c.subset(DEFAULT_POOL_KEY);
            applyConfiguration(conf, ds);
        }

        Configuration conf = configuration.subset(POOL_KEY);
        applyConfiguration(conf, ds);
        return ds;
    }
}