//License
/***
* Java Modbus Library (jamod)
* Copyright (c) 2002-2004, jamod development team
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the author nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS ``AS
* IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
***/
package net.wimpi.modbus.net;
import net.wimpi.modbus.Modbus;
import net.wimpi.modbus.ModbusCoupler;
import net.wimpi.modbus.ModbusIOException;
import net.wimpi.modbus.io.ModbusTransport;
import net.wimpi.modbus.msg.ModbusRequest;
import net.wimpi.modbus.msg.ModbusResponse;
/**
* Class implementing a handler for incoming Modbus/TCP requests.
*
* @author Dieter Wimberger
* @version 1.2rc1 (09/11/2004)
*/
public class TCPConnectionHandler implements Runnable {
private TCPSlaveConnection m_Connection;
private ModbusTransport m_Transport;
/**
* Constructs a new <tt>TCPConnectionHandler</tt> instance.
*
* @param con an incoming connection.
*/
public TCPConnectionHandler(TCPSlaveConnection con) {
setConnection(con);
}//constructor
/**
* Sets a connection to be handled by this <tt>
* TCPConnectionHandler</tt>.
*
* @param con a <tt>TCPSlaveConnection</tt>.
*/
public void setConnection(TCPSlaveConnection con) {
m_Connection = con;
m_Transport = m_Connection.getModbusTransport();
}//setConnection
public void run() {
try {
do {
//1. read the request
ModbusRequest request = m_Transport.readRequest();
//System.out.println("Request:" + request.getHexMessage());
ModbusResponse response = null;
//test if Process image exists
if (ModbusCoupler.getReference().getProcessImage() == null) {
response =
request.createExceptionResponse(Modbus.ILLEGAL_FUNCTION_EXCEPTION);
} else {
response = request.createResponse();
}
/*DEBUG*/
if (Modbus.debug) System.out.println("Request:" + request.getHexMessage());
if (Modbus.debug) System.out.println("Response:" + response.getHexMessage());
//System.out.println("Response:" + response.getHexMessage());
m_Transport.writeMessage(response);
} while (true);
} catch (ModbusIOException ex) {
if (!ex.isEOF()) {
//other troubles, output for debug
ex.printStackTrace();
}
} finally {
try {
m_Connection.close();
} catch (Exception ex) {
//ignore
}
}
}//run
}//TCPConnectionHandler