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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 java.io.IOException;
import java.net.Socket;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.util.Properties;
import com.sap.dbtech.util.MessageKey;
import com.sap.dbtech.util.MessageTranslator;
/**
* Low-level socket communication.
*
* as specified by the SAP DB runtime environment.
*
*/
public class SocketComm extends BasicSocketComm {
public final static JdbcCommFactory factory = new JdbcCommFactory() {
public JdbcCommunication open(String host, String dbname,
Properties properties) throws RTEException {
SocketComm sc = new SocketComm(host, properties);
sc.connectDB(dbname);
return sc;
}
public JdbcCommunication xopen(String host, String db, String dbroot,
String pgm, Properties properties) throws RTEException {
SocketComm sc = new SocketComm(host, properties);
sc.connectAdmin(db, dbroot, pgm);
return sc;
}
};
// instance variables
/**
* creates a new socket connection to <i>host </i>.
*
* @exception RTEException
*/
protected SocketComm(String hostPort, Properties properties)
throws RTEException {
super(hostPort, properties);
this.openSocket();
}
/**
* opens a socket connection.
*
* This converts any java.net specific exceptions to RTEException.
*
* @param host
* java.lang.String
* @exception RTEException
*/
protected void openSocket() throws RTEException {
try {
this.socket = new Socket(this.host, this.lookupPort());
try {
this.socket.setSoTimeout(this.socketTimeOut);
this.socket.setTcpNoDelay(true);
//this.socket.setReceiveBufferSize(36864);
this.socket.setSendBufferSize(36864);
} catch (SocketException socketEx) {
// ignore, as it is harmless
}
this.instream = this.socket.getInputStream();
this.outstream = this.socket.getOutputStream();
} catch (UnknownHostException uhexc) {
throw new RTEException(
MessageTranslator
.translate(
MessageKey.ERROR_UNKNOWN_HOST,
this.host,
uhexc.getMessage(),
new Integer(
RteC.CommunicationErrorCodeMap_C[RteC.SQLSERVER_OR_DB_UNKNOWN_C])),
RteC.CommunicationErrorCodeMap_C[RteC.SQLSERVER_OR_DB_UNKNOWN_C]);
} catch (IOException ioexc) {
throw new RTEException(
MessageTranslator
.translate(
MessageKey.ERROR_HOST_CONNECT,
this.host,
ioexc.getMessage(),
new Integer(
RteC.CommunicationErrorCodeMap_C[RteC.SQLSTART_REQUIRED_C])),
RteC.CommunicationErrorCodeMap_C[RteC.SQLSTART_REQUIRED_C]);
}
try {
// !!! DO NOT LINGER !!!
// Modern OS linger in the background, if necessary.
// Lingering causes the whole Java application to linger for that
// time, if the
// x_server hasn't read all data. And in case he hasn't our last
// command was
// a COMMIT/ROLLBACK WORK RELEASE, so no harm is done to the
// database. The
// only thing could be some nasty entry in some x_server log ...
this.socket.setSoLinger(true, 15);
} catch (SocketException soExc) {
// ignore
}
}
protected BasicSocketComm getNewCommunication() throws RTEException {
return new SocketComm(this.host + ":" + this.port, null);
}
/*
* (non-Javadoc)
*
* @see com.sap.dbtech.rte.comm.BasicSocketComm#getDefaultPort()
*/
protected int getDefaultPort() {
return RteC.defaultPort_C;
}
}
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