/***
* Copyright 2002-2010 jamod development team
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
***/
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 @version@ (@date@)
*/
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