persistenceutils.java

OBPM是一个开源

package cn.myapps.base.dao;

import java.beans.PropertyVetoException;
import java.util.Properties;

import javax.sql.DataSource;

import org.apache.commons.dbcp.BasicDataSource;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.cfg.Configuration;

import com.mchange.v2.c3p0.ComboPooledDataSource;

/**
 * The persistence utility.
 */
public class PersistenceUtils {
	private static Log logger = LogFactory.getLog(PersistenceUtils.class);

	private static final ThreadLocal sessionSignal = new ThreadLocal();

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

	private static DataSource ds = null; // DBCP DataSource

	public static SessionSignal getSessionSignal() {
		SessionSignal sg = (SessionSignal) sessionSignal.get();
		if (sg == null) {
			sg = new SessionSignal();
			sessionSignal.set(sg);
		}
		return sg;
	}

	/**
	 * Get the current session.
	 * 
	 * @return The current session.
	 * @throws Exception
	 */
	public static Session currentSession() throws Exception {
		try {
			logger.debug("get session!");
			return HibernateBaseDAO.currentSession();
		} catch (HibernateException he) {
			throw new Exception(he);
		}
	}

	/**
	 * Close the session.
	 * 
	 * @throws Exception
	 */
	public static void closeSession() throws Exception {
		try {
			logger.debug("close session!");
			HibernateBaseDAO.closeSession();
		} catch (HibernateException he) {
			throw new Exception(he);
		}
	}

	/**
	 * Open the transcation.
	 * 
	 * @throws Exception
	 */
	public static void beginTransaction() throws Exception {
		try {
			HibernateBaseDAO.beginTransaction();
		} catch (HibernateException he) {
			throw new Exception(he);
		}
	}

	/**
	 * Commit the transcation.
	 * 
	 * @throws Exception
	 */
	public static void commitTransaction() throws Exception {
		try {
			HibernateBaseDAO.commitTransaction();
		} catch (HibernateException he) {
			throw new Exception(he);
		}
	}

	/**
	 * Roll back the transaction.
	 * 
	 * @throws Exception
	 */
	public static void rollbackTransaction() throws Exception {
		try {
			HibernateBaseDAO.rollbackTransaction();
		} catch (HibernateException he) {
			throw new Exception(he);
		}
	}

	public static DataSource getDataSource() throws Exception {
		/*if (ds == null) {*/
			Configuration cfg = new Configuration().configure();

			Properties prop = cfg.getProperties();
			String username = prop.getProperty("hibernate.connection.username");
			String password = prop.getProperty("hibernate.connection.password");
			String driver = prop
					.getProperty("hibernate.connection.driver_class");
			String url = prop.getProperty("hibernate.connection.url");

			ds = getDBCPDataSource(username, password, driver, url);
//		}
		return ds;
	}

	public static DataSource getC3P0DataSource(String username,
			String password, String driver, String url) throws Exception {
		ComboPooledDataSource ds = new ComboPooledDataSource();

		ds.setUser(username);
		ds.setPassword(password);
		ds.setDriverClass(driver);
		ds.setJdbcUrl(url);

		ds.setAutoCommitOnClose(false);
		ds.setMaxPoolSize(20);
		ds.setMaxIdleTime(10);
		ds.setMaxStatements(5);

		return ds;
	}

	public static DataSource getDBCPDataSource(String username,
			String password, String driver, String url) {

		BasicDataSource ds = new BasicDataSource();

		ds.setUsername(username);
		ds.setPassword(password);
		ds.setDriverClassName(driver);
		ds.setUrl(url);

		// ds.setPoolPreparedStatements(true);
		// ds.setMaxOpenPreparedStatements(10);
		//ds.setInitialSize(10);
		ds.setMaxIdle(1);
		ds.setDefaultAutoCommit(false);
		ds.setMaxActive(10);

		return ds;
	}
}