ro.ciprianpascu.sbus.net.UDPMasterConnection Maven / Gradle / Ivy
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jamod is an object oriented implementation of the S-Bus protocol,
realized 100% in Java. It allows to quickly
realize master and slave applications in various transport flavors (IP
and serial).
The newest version!
/**
* 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 ro.ciprianpascu.sbus.net;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.util.Enumeration;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import ro.ciprianpascu.sbus.Modbus;
import ro.ciprianpascu.sbus.io.ModbusTransport;
/**
* Class that implements a UDPMasterConnection.
*
* @author Dieter Wimberger
* @author Ciprian Pascu
* @version %I% (%G%)
*/
public class UDPMasterConnection implements ModbusSlaveConnection {
private static final Logger logger = LoggerFactory.getLogger(UDPMasterConnection.class);
private static int LOCAL_PORT = Modbus.DEFAULT_PORT;
// instance attributes
private UDPMasterTerminal m_Terminal;
private int m_Timeout = Modbus.DEFAULT_TIMEOUT;
private boolean m_Connected;
protected InetAddress m_RemoteAddress;
private int m_Port = Modbus.DEFAULT_PORT;
public UDPMasterConnection() {
}
public UDPMasterConnection(int port) {
setPort(port);
}
/**
* Opens this {@link UDPMasterConnection}.
*
* @throws Exception if there is a network failure.
*/
@Override
public synchronized boolean connect() throws Exception {
if (!m_Connected) {
InetAddress localAddress = getLocalIP();
m_Terminal = new UDPMasterTerminal(localAddress);
m_Terminal.setLocalPort(LOCAL_PORT);
m_Terminal.setRemoteAddress(m_RemoteAddress == null ? InetAddress.getByAddress(getTargetIP(localAddress.getAddress())) : m_RemoteAddress);
m_Terminal.setRemotePort(m_Port);
m_Terminal.setTimeout(m_Timeout);
m_Terminal.activate();
m_Connected = true;
}
return m_Connected;
}// connect
/**
* Closes this {@link UDPMasterConnection}.
*/
public void close() {
if (m_Connected) {
try {
m_Terminal.deactivate();
} catch (Exception ex) {
if (Modbus.debug) {
ex.printStackTrace();
}
}
m_Connected = false;
}
}// close
/**
* Returns the {@link ModbusTransport} associated with this
* {@link UDPMasterConnection}.
*
* @return the connection's {@link ModbusTransport}.
*/
public ModbusTransport getModbusTransport() {
return m_Terminal.getModbusTransport();
}// getModbusTransport
/**
* Returns the terminal used for handling the package traffic.
*
* @return a {@link UDPTerminal} instance.
*/
public UDPTerminal getTerminal() {
return m_Terminal;
}// getTerminal
/**
* Returns the timeout for this {@link UDPMasterConnection}.
*
* @return the timeout as {@link int}.
*/
public int getTimeout() {
return m_Timeout;
}// getReceiveTimeout
/**
* Sets the timeout for this {@link UDPMasterConnection}.
*
* @param timeout the timeout as {@link int}.
*/
public void setTimeout(int timeout) {
m_Timeout = timeout;
m_Terminal.setTimeout(timeout);
}// setReceiveTimeout
/**
* Returns the destination port of this {@link UDPMasterConnection}.
*
* @return the port number as {@link int}.
*/
public int getPort() {
return m_Port;
}// getPort
/**
* Sets the destination port of this {@link UDPMasterConnection}. The default is
* defined as {@link Modbus#DEFAULT_PORT}.
*
* @param port the port number as {@link int}.
*/
public void setPort(int port) {
m_Port = port;
}// setPort
/**
* Sets the destination {@link InetAddress} of this
* {@link UDPSlaveTerminal}.
*
* @param adr the destination address as {@link InetAddress}.
*/
public void setRemoteAddress(InetAddress adr) {
m_RemoteAddress = adr;
}// setAddress
/**
* Tests if this {@link UDPMasterConnection} is connected.
*
* @return true if connected, false otherwise.
*/
@Override
public boolean isConnected() {
return m_Connected;
}// isConnected
@Override
public void resetConnection() {
close();
}
@Override
public String toString() {
return "UDPMasterConnection [m_Terminal=" + m_Terminal + ", m_Timeout=" + m_Timeout + ", m_Connected="
+ m_Connected + ", m_Port=" + m_Port + "]";
}
private InetAddress getLocalIP() throws SocketException, UnknownHostException {
for (Enumeration en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) {
NetworkInterface intf = en.nextElement();
for (Enumeration enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements();) {
InetAddress inetAddress = enumIpAddr.nextElement();
if (!inetAddress.isLoopbackAddress()) {
return inetAddress;
}
}
}
return InetAddress.getLocalHost();
}
private byte[] getTargetIP(byte[] arraybyteLocalIP)
{
byte[] arraybyteTargetIP= new byte[4];
byte byteBit;
byteBit=(byte) ((arraybyteLocalIP[0] & 0xFF)>>5);
if (((byteBit & 0xFF)>=0) && ((byteBit & 0xFF)<=3)) //IP type:A
{
arraybyteTargetIP[0]=arraybyteLocalIP[0];
arraybyteTargetIP[1]=(byte) 255;
arraybyteTargetIP[2]=(byte) 255;
arraybyteTargetIP[3]=(byte) 255;
}
else if (((byteBit & 0xFF)>=4) && ((byteBit & 0xFF)<=5)) //IP Type:B
{
arraybyteTargetIP[0]=arraybyteLocalIP[0];
arraybyteTargetIP[1]=arraybyteLocalIP[1];
arraybyteTargetIP[2]=(byte) 255;
arraybyteTargetIP[3]=(byte) 255;
}
else if (((byteBit & 0xFF)>=6) && ((byteBit & 0xFF)<=7)) //IP Type:C
{
arraybyteTargetIP[0]=arraybyteLocalIP[0];
arraybyteTargetIP[1]=arraybyteLocalIP[1];
arraybyteTargetIP[2]=arraybyteLocalIP[2];
arraybyteTargetIP[3]=(byte) 255;
}
else
{
arraybyteTargetIP[0]=(byte) 255;
arraybyteTargetIP[1]=(byte) 255;
arraybyteTargetIP[2]=(byte) 255;
arraybyteTargetIP[3]=(byte) 255;
}
return arraybyteTargetIP;
}
}// class UDPMasterConnection