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/*
========== licence begin GPL
Copyright (C) 2002-2003 SAP AG
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
========== licence end
*/
package com.sap.dbtech.rte.comm;
import com.sap.dbtech.util.*;
/**
* the public interface used by clients to communicate with SAP DB servers.
*/
public abstract class JdbcCommunication {
/**
* checks whether challenge response authentication is available or not
* @return boolean
* @exception com.sap.dbtech.rte.comm.RTEException.
*/
public abstract boolean isChallengeResponseSupported () throws java.sql.SQLException;
/**
* cancels a pending request.
*/
public abstract void cancel () throws java.sql.SQLException;
/**
* does request and receive in one method call.
* @return com.sap.dbtech.util.StructuredMem
* @param len int
* @exception com.sap.dbtech.rte.comm.RTEException.
*/
public StructuredMem execute (StructuredMem userPacket, int len) throws RTEException {
this.request (userPacket, len);
return this.receive ();
}
/**
* gets a new request packet.
* @return StructuredMem
*/
public StructuredMem getRequestPacket ()
throws RTEException
{
return null;
}
/**
* test whether the connection is still valid.
* @return boolean
*/
abstract public boolean isConnected ();
/**
* blocks while waiting for a reply
* @return StructuredMem
* @exception com.sap.dbtech.rte.comm.RTEException.
*/
abstract public StructuredMem receive () throws RTEException;
/**
* tries to reconnect after a timeout.
* @exception com.sap.dbtech.rte.comm.RTEException.
*/
public void reconnect () throws RTEException {
}
/**
* closes the connection.
*/
public abstract void release ();
/**
* send a new request to the server.
* @param userPacket StructuredMem
* @param len int
* @exception com.sap.dbtech.rte.comm.RTEException.
*/
public abstract void request (StructuredMem userPacket, int len) throws RTEException;
}
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