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package com.sun.appserv.jdbc;
import java.sql.Connection;
import java.sql.SQLException;
/**
* The <code>javax.sql.DataSource</code> 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.
* <p>A sample code for getting driver's connection implementation would like
* the following.
* <pre>
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();
</pre>
*
* @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 <code>Datasource.getConnection()</code>
* @return <code>java.sql.Connection</code> implementation of the driver.
* @throws <code>java.sql.SQLException</code> 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 <code>java.sql.Connection</code>
* @throws <code>java.sql.SQLException</code> 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 user User name for authenticating the connection
* @param password Password for authenticating the connection
* @return <code>java.sql.Connection</code>
* @throws <code>java.sql.SQLException</code> 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:
* <pre>
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
}
* </pre>
* @param conn <code>java.sql.Connection</code>
*/
public void markConnectionAsBad(Connection conn);
}