connectionmanager.java

JSP聊天系统

package org.ehotsoft.yekki.sql;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class ConnectionManager {
	
	private static ConnectionProvider connectionProvider;
    private static Object lock = new Object();
	
	
	public static Connection getConnection()
		throws Exception {

        if ( connectionProvider == null ) {

            synchronized ( lock ) {

				connectionProvider = new ConnectionProvider();
            }
        }
		
		Connection cnn = connectionProvider.getConnection();
        
		return cnn;
    }

	public static void setConnectionProvider( ConnectionProvider provider ) {
		
		synchronized ( lock ) {
			
			connectionProvider = provider;
		}
	}
	
}