/***
* 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 java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import net.wimpi.modbus.Modbus;
import net.wimpi.modbus.io.ModbusUDPTransport;
/**
* Class implementing a <tt>UDPMasterTerminal</tt>.
*
* @author Dieter Wimberger
* @version @version@ (@date@)
*/
class UDPMasterTerminal
implements UDPTerminal {
private DatagramSocket m_Socket;
private int m_Timeout = Modbus.DEFAULT_TIMEOUT;
private boolean m_Active;
protected InetAddress m_LocalAddress;
protected InetAddress m_RemoteAddress;
private int m_RemotePort = Modbus.DEFAULT_PORT;
private int m_LocalPort = Modbus.DEFAULT_PORT;
protected ModbusUDPTransport m_ModbusTransport;
public UDPMasterTerminal() {
}//constructor
protected UDPMasterTerminal(InetAddress addr) {
m_RemoteAddress = addr;
}//constructor
public InetAddress getLocalAddress() {
return m_LocalAddress;
}//getLocalAddress
public void setLocalAddress(InetAddress addr) {
m_LocalAddress = addr;
}//setLocalAddress
public int getLocalPort() {
return m_LocalPort;
}//getLocalPort
protected void setLocalPort(int port) {
m_LocalPort = port;
}//setLocalPort
/**
* Returns the destination port of this
* <tt>UDPSlaveTerminal</tt>.
*
* @return the port number as <tt>int</tt>.
*/
public int getRemotePort() {
return m_RemotePort;
}//getDestinationPort
/**
* Sets the destination port of this
* <tt>UDPSlaveTerminal</tt>.
* The default is defined as <tt>Modbus.DEFAULT_PORT</tt>.
*
* @param port the port number as <tt>int</tt>.
*/
public void setRemotePort(int port) {
m_RemotePort = port;
}//setPort
/**
* Returns the destination <tt>InetAddress</tt> of this
* <tt>UDPSlaveTerminal</tt>.
*
* @return the destination address as <tt>InetAddress</tt>.
*/
public InetAddress getRemoteAddress() {
return m_RemoteAddress;
}//getAddress
/**
* Sets the destination <tt>InetAddress</tt> of this
* <tt>UDPSlaveTerminal</tt>.
*
* @param adr the destination address as <tt>InetAddress</tt>.
*/
public void setRemoteAddress(InetAddress adr) {
m_RemoteAddress = adr;
}//setAddress
/**
* Tests if this <tt>UDPSlaveTerminal</tt> is active.
*
* @return <tt>true</tt> if active, <tt>false</tt> otherwise.
*/
public boolean isActive() {
return m_Active;
}//isActive
/**
* Activate this <tt>UDPTerminal</tt>.
*
* @throws Exception if there is a network failure.
*/
public synchronized void activate()
throws Exception {
if (!isActive()) {
if (Modbus.debug) System.out.println("UDPMasterTerminal::activate()::laddr=:" + m_LocalAddress.toString() + ":lport=" + m_LocalPort);
if (m_Socket == null) {
if (m_LocalAddress != null && m_LocalPort != -1) {
m_Socket = new DatagramSocket(m_LocalPort, m_LocalAddress);
} else {
m_Socket = new DatagramSocket();
m_LocalPort = m_Socket.getLocalPort();
m_LocalAddress = m_Socket.getLocalAddress();
}
}
if (Modbus.debug) System.out.println("UDPMasterTerminal::haveSocket():" + m_Socket.toString());
if (Modbus.debug) System.out.println("UDPMasterTerminal::laddr=:" + m_LocalAddress.toString() + ":lport=" + m_LocalPort);
if (Modbus.debug) System.out.println("UDPMasterTerminal::raddr=:" + m_RemoteAddress.toString() + ":rport=" + m_RemotePort);
m_Socket.setReceiveBufferSize(1024);
m_Socket.setSendBufferSize(1024);
m_ModbusTransport = new ModbusUDPTransport(this);
m_Active = true;
}
if (Modbus.debug) System.out.println("UDPMasterTerminal::activated");
}//activate
/**
* Deactivates this <tt>UDPSlaveTerminal</tt>.
*/
public void deactivate() {
try {
if (Modbus.debug) System.out.println("UDPMasterTerminal::deactivate()");
//close socket
m_Socket.close();
m_ModbusTransport = null;
m_Active = false;
} catch (Exception ex) {
ex.printStackTrace();
}
}//deactivate
/**
* Returns the <tt>ModbusTransport</tt> associated with this
* <tt>TCPMasterConnection</tt>.
*
* @return the connection's <tt>ModbusTransport</tt>.
*/
public ModbusUDPTransport getModbusTransport() {
return m_ModbusTransport;
}//getModbusTransport
/**
* Returns the timeout for this <tt>UDPMasterTerminal</tt>.
*
* @return the timeout as <tt>int</tt>.
*/
public int getTimeout() {
return m_Timeout;
}//getReceiveTimeout
/**
* Sets the timeout for this <tt>UDPMasterTerminal</tt>.
*
* @param timeout the timeout as <tt>int</tt>.
*/
public void setTimeout(int timeout) {
m_Timeout = timeout;
}//setReceiveTimeout
public void sendMessage(byte[] msg)
throws Exception {
DatagramPacket req = new DatagramPacket(
msg,
msg.length,
m_RemoteAddress,
m_RemotePort
);
synchronized (m_Socket) {
m_Socket.send(req);
}
}//sendPackage
public byte[] receiveMessage()
throws Exception {
//1. Prepare buffer and receive package
byte[] buffer = new byte[256];//max size
DatagramPacket packet = new DatagramPacket(buffer, buffer.length);
synchronized (m_Socket) {
m_Socket.setSoTimeout(m_Timeout);
m_Socket.receive(packet);
}
return buffer;
}//receiveMessage
public void receiveMessage(byte[] buffer)
throws Exception {
DatagramPacket packet = new DatagramPacket(buffer, buffer.length);
m_Socket.setSoTimeout(m_Timeout);
m_Socket.receive(packet);
}//receiveMessage
}//class UDPMasterTerminal