jndidatasourcefactory.java

用java开发的一些实用的短信通信模块其中包含MD5加密、http发送等信息

package lib.commons.dal;

import java.sql.Connection;
import java.sql.SQLException;
import javax.sql.DataSource;
import java.util.Properties;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;

import org.apache.commons.logging.Log;

import lib.commons.Utils;

public class JNDIDataSourceFactory extends DbAccessFactory {
	private String jndiName;

	private DataSource dataSource;

	private Object lockObject = new Object();

	public JNDIDataSourceFactory(String jndiName) {
		super(null);
		this.jndiName = jndiName;
	}

	public JNDIDataSourceFactory(Properties properties) {
		super(properties);
		jndiName = properties.getProperty("dataSourceJndiName");
	}

	public static Object getObjectFromJNDI(String jndiName)
			throws NamingException {
		Context ctx = new InitialContext();
		Object jndiObject = ctx.lookup(jndiName);
		return jndiObject;
	}

	protected DbAccess createDbAccess() {
		if (null == dataSource) {
			synchronized (lockObject) {
				if (null == dataSource) {
					try {
						dataSource = (DataSource) getObjectFromJNDI(jndiName);
					} catch (NamingException err) {
						Log log = Utils.getLog(JNDIDataSourceFactory.class);
						log.error(err.getMessage(), err);
					}
				}
			}
		}
		DbAccess db = null;
		Connection conn = null;
		try {
			conn = dataSource.getConnection();
		} catch (SQLException err) {
			Log log = Utils.getLog(JNDIDataSourceFactory.class);
			log.error(err.getMessage(), err);
		}
		db = new DbAccess(conn);
		return db;
	}
}