/***
* 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.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Socket;
import org.apache.commons.lang.builder.StandardToStringStyle;
import org.apache.commons.lang.builder.ToStringBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import net.wimpi.modbus.Modbus;
import net.wimpi.modbus.io.ModbusTCPTransport;
import net.wimpi.modbus.io.ModbusTransport;
/**
* Class that implements a TCPMasterConnection.
*
* @author Dieter Wimberger
* @version @version@ (@date@)
*/
public class TCPMasterConnection implements ModbusSlaveConnection {
private static final Logger logger = LoggerFactory.getLogger(TCPMasterConnection.class);
// instance attributes
private Socket m_Socket;
private int m_Timeout = Modbus.DEFAULT_TIMEOUT;
private boolean m_Connected;
private InetAddress m_Address;
private int m_Port = Modbus.DEFAULT_PORT;
// private int m_Retries = Modbus.DEFAULT_RETRIES;
private ModbusTCPTransport m_ModbusTransport;
private int m_ConnectTimeoutMillis;
private static StandardToStringStyle toStringStyle = new StandardToStringStyle();
static {
toStringStyle.setUseShortClassName(true);
}
/**
* Constructs a <tt>TCPMasterConnection</tt> instance
* with a given destination address.
*
* @param adr the destination <tt>InetAddress</tt>.
*/
public TCPMasterConnection(InetAddress adr) {
m_Address = adr;
}// constructor
public TCPMasterConnection(InetAddress adr, int port) {
this(adr);
setPort(port);
}
public TCPMasterConnection(InetAddress adr, int port, int connectTimeoutMillis) {
this(adr, port);
setConnectTimeoutMillis(connectTimeoutMillis);
}
/**
* Opens this <tt>TCPMasterConnection</tt>.
*
* @throws Exception if there is a network failure.
*/
@Override
public synchronized boolean connect() throws Exception {
if (!isConnected()) {
logger.debug("connect()");
m_Socket = new Socket();
m_Socket.connect(new InetSocketAddress(m_Address, m_Port), this.m_ConnectTimeoutMillis);
setTimeout(m_Timeout);
m_Socket.setReuseAddress(true);
m_Socket.setSoLinger(true, 1);
m_Socket.setKeepAlive(true);
prepareTransport();
m_Connected = true;
}
return m_Connected;
}// connect
/**
* Closes this <tt>TCPMasterConnection</tt>.
*/
public void close() {
if (m_Connected) {
try {
m_ModbusTransport.close();
} catch (IOException ex) {
logger.debug("close()");
}
m_Connected = false;
}
}// close
/**
* Returns the <tt>ModbusTransport</tt> associated with this
* <tt>TCPMasterConnection</tt>.
*
* @return the connection's <tt>ModbusTransport</tt>.
*/
public ModbusTransport getModbusTransport() {
return m_ModbusTransport;
}// getModbusTransport
/**
* Prepares the associated <tt>ModbusTransport</tt> of this
* <tt>TCPMasterConnection</tt> for use.
*
* @throws IOException if an I/O related error occurs.
*/
private void prepareTransport() throws IOException {
if (m_ModbusTransport == null) {
m_ModbusTransport = new ModbusTCPTransport(m_Socket);
} else {
m_ModbusTransport.setSocket(m_Socket);
}
}// prepareIO
/**
* Returns the timeout for this <tt>TCPMasterConnection</tt>.
*
* @return the timeout as <tt>int</tt>.
*/
public int getTimeout() {
return m_Timeout;
}// getReceiveTimeout
/**
* Sets the timeout for this <tt>TCPMasterConnection</tt>.
*
* @param timeout the timeout as <tt>int</tt>.
*/
public void setTimeout(int timeout) {
m_Timeout = timeout;
if (m_Socket != null) {
try {
m_Socket.setSoTimeout(m_Timeout);
} catch (IOException ex) {
logger.error("Could not set socket timeout on connection {} {}: {}", getAddress(), getPort(),
ex.getMessage());
}
}
}// setReceiveTimeout
/**
* Returns the destination port of this
* <tt>TCPMasterConnection</tt>.
*
* @return the port number as <tt>int</tt>.
*/
public int getPort() {
return m_Port;
}// getPort
/**
* Sets the destination port of this
* <tt>TCPMasterConnection</tt>.
* The default is defined as <tt>Modbus.DEFAULT_PORT</tt>.
*
* @param port the port number as <tt>int</tt>.
*/
public void setPort(int port) {
m_Port = port;
}// setPort
/**
* Returns the destination <tt>InetAddress</tt> of this
* <tt>TCPMasterConnection</tt>.
*
* @return the destination address as <tt>InetAddress</tt>.
*/
public InetAddress getAddress() {
return m_Address;
}// getAddress
/**
* Sets the destination <tt>InetAddress</tt> of this
* <tt>TCPMasterConnection</tt>.
*
* @param adr the destination address as <tt>InetAddress</tt>.
*/
public void setAddress(InetAddress adr) {
m_Address = adr;
}// setAddress
/**
* Tests if this <tt>TCPMasterConnection</tt> is connected.
*
* @return <tt>true</tt> if connected, <tt>false</tt> otherwise.
*/
@Override
public boolean isConnected() {
// From j2mod originally. Sockets that are not fully open are closed.
if (m_Connected && m_Socket != null) {
// Call close() if the connection is not fully "open"
if (!m_Socket.isConnected() || m_Socket.isClosed() || m_Socket.isInputShutdown()
|| m_Socket.isOutputShutdown()) {
close();
}
}
return m_Connected;
}// isConnected
@Override
public void resetConnection() {
close();
}
@Override
public String toString() {
return new ToStringBuilder(this, toStringStyle).append("socket", m_Socket).toString();
}
public int getConnectTimeoutMillis() {
return m_ConnectTimeoutMillis;
}
public void setConnectTimeoutMillis(int m_ConnectTimeoutMillis) {
this.m_ConnectTimeoutMillis = m_ConnectTimeoutMillis;
}
}// class TCPMasterConnection