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package com.sun.appserv.jdbc;

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

/**
 * The javax.sql.DataSource implementation of SunONE application 
 * server will implement this interface. An application program would be able
 * to use this interface to do the extended functionality exposed by SunONE 
 * application server.
 * A sample code for getting driver's connection implementation would like 
 * the following.
 * 
     InitialContext ic = new InitialContext();
     com.sun.appserv.DataSource ds = (com.sun.appserv.DataSOurce) ic.lookup("jdbc/PointBase"); 
     Connection con = ds.getConnection();
     Connection drivercon = ds.getConnection(con);

     // Do db operations.

     con.close();
   
 * 
 * @author Binod P.G
 */
public interface DataSource extends javax.sql.DataSource {

    /**
     * Retrieves the actual SQLConnection from the Connection wrapper 
     * implementation of SunONE application server. If an actual connection is
     * supplied as argument, then it will be just returned.
     *
     * @param con Connection obtained from Datasource.getConnection()
     * @return java.sql.Connection implementation of the driver.
     * @throws java.sql.SQLException If connection cannot be obtained.
     */
    public Connection getConnection(Connection con) throws SQLException;

    /**
     * Gets a connection that is not in the scope of any transaction. This
     * can be used to save performance overhead incurred on enlisting/delisting
     * each connection got, irrespective of whether its required or not.
     * Note here that this meethod does not fit in the connector contract
     * per se.
     *
     * @return java.sql.Connection
     * @throws java.sql.SQLException If connection cannot be obtained
     */
    public Connection getNonTxConnection() throws SQLException;

    /**
     * Gets a connection that is not in the scope of any transaction. This
     * can be used to save performance overhead incurred on enlisting/delisting
     * each connection got, irrespective of whether its required or not.
     * Note here that this meethod does not fit in the connector contract
     * per se.
     *
     * @param userName User name for authenticating the connection
     * @param password Password for authenticating the connection
     * @return java.sql.Connection
     * @throws java.sql.SQLException If connection cannot be obtained
     */
    public Connection getNonTxConnection( String userName, String password ) 
        throws SQLException;


     /**
     * API to mark a connection as bad. If the application can determine that the connection
     * is bad, using this api, it can notify the resource-adapter which inturn will notify the
     * connection-pool. Connection-pool will drop and create a new connection.
     * eg:
     *         com.sun.appserv.jdbc.DataSource ds=
           (com.sun.appserv.jdbc.DataSource)context.lookup("dataSource");
	  	Connection con = ds.getConnection();
	  	Statement stmt = null;
	  	try{
	 		 stmt = con.createStatement();
	 		 stmt.executeUpdate("Update");
	 	}catch(BadConnectionException e){
	 		dataSource.markConnectionAsBad(con) //marking it as bad for removal
	 	}finally{
	 		stmt.close();
	 		con.close(); //Connection will be destroyed while close or Tx completion
	    }
     * 
     * @param conn java.sql.Connection
     */
    public void markConnectionAsBad(Connection conn);

}