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/*
* Copyright (C) 2015 SDN-WISE
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see .
*/
package com.github.sdnwiselab.sdnwise.adapter;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.util.LinkedList;
import java.util.Map;
import java.util.Observable;
import java.util.Observer;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* The adapter class for UDP port communication. Configuration data are passed
* using a Map which contains all the options needed in the
* constructor of the class.
*
* @author Sebastiano Milardo
* @version 0.1
*/
public class AdapterTcp extends Adapter{
private final int PORT;
private final String IP;
private final boolean IS_SERVER;
private TcpElement tcpElement;
private Thread th;
/**
* Creates an AdapterUDP object. The conf map is used to pass the
* configuration settings for the serial port as strings. Specifically
* needed parameters are:
*
*
IN_PORT
*
*
* @param conf contains the serial port configuration data.
*/
public AdapterTcp(Map conf) {
this.IS_SERVER = Boolean.parseBoolean(conf.get("IS_SERVER"));
this.IP = conf.get("IP");
this.PORT = Integer.parseInt(conf.get("PORT"));
}
/**
* Opens this adapter.
*
* @return a boolean indicating the correct ending of the operation
*/
@Override
public final boolean open() {
if (IS_SERVER) {
tcpElement = new TcpServer(PORT);
} else {
tcpElement = new TcpClient(IP, PORT);
}
tcpElement.addObserver(this);
th = new Thread(tcpElement);
th.start();
return true;
}
/**
* Closes this adapter.
*
* @return a boolean indicating the correct ending of the operation
*/
@Override
public final boolean close() {
tcpElement.isStopped = true;
return true;
}
/**
* Sends a byte array using this adapter.
*
* @param data the array to be sent
*/
@Override
public final void send(byte[] data) {
tcpElement.send(data);
}
/**
* Sends a byte array using this adapter. This method also specifies the
* destination IP address and TCP port.
*
* @param data the array to be sent
* @param OUT_IP a string containing the IP address of the destination
* @param OUT_PORT an integer containing the UDP port of the destination
*/
public final void send(byte[] data, String OUT_IP, int OUT_PORT) {
tcpElement.send(data);
}
/**
* Sends a byte array using this adapter. This method also specifies the
* destination IP address and UDP port.
*
* @param data the array to be sent
* @param OUT_IP a string containing the IP address of the destination
* @param OUT_PORT an integer containing the UDP port of the destination
*/
public final void sendDatagram(byte[] data, String OUT_IP, int OUT_PORT) {
try (DatagramSocket sck = new DatagramSocket(OUT_PORT)) {
DatagramPacket packet = new DatagramPacket(data, data.length,
InetAddress.getByName(OUT_IP), OUT_PORT);
sck.send(packet);
} catch (SocketException ex) {
Logger.getLogger(AdapterTcp.class.getName()).log(Level.SEVERE, null, ex);
} catch (UnknownHostException ex) {
Logger.getLogger(AdapterTcp.class.getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
Logger.getLogger(AdapterTcp.class.getName()).log(Level.SEVERE, null, ex);
}
}
private abstract class TcpElement extends Observable implements Runnable, Observer {
boolean isStopped = false;
final int port;
TcpElement(int port) {
this.port = port;
}
public abstract void send(byte[] data);
synchronized boolean isStopped() {
return this.isStopped;
}
@Override
public final void update(Observable o, Object arg) {
setChanged();
notifyObservers(arg);
}
}
private class TcpServer extends TcpElement {
private ServerSocket serverSocket = null;
private final LinkedList clientSockets = new LinkedList<>();
TcpServer(int port) {
super(port);
}
@Override
public void run() {
openServerSocket();
Socket clientSocket = null;
while (!isStopped()) {
try {
clientSocket = this.serverSocket.accept();
clientSockets.add(clientSocket);
} catch (IOException e) {
if (isStopped()) {
return;
}
throw new RuntimeException(
"Error accepting client connection", e);
}
WorkerRunnable wr = new WorkerRunnable(clientSocket);
wr.addObserver(this);
new Thread(wr).start();
}
}
public synchronized void stop() {
this.isStopped = true;
try {
this.serverSocket.close();
} catch (IOException e) {
throw new RuntimeException("Error closing server", e);
}
}
private void openServerSocket() {
try {
this.serverSocket = new ServerSocket(this.port);
} catch (IOException e) {
throw new RuntimeException("Cannot open port", e);
}
}
@Override
public void send(byte[] data) {
for (Socket sck : clientSockets) {
try {
OutputStream out = sck.getOutputStream();
DataOutputStream dos = new DataOutputStream(out);
dos.write(data);
} catch (IOException ex) {
Logger.getLogger(AdapterTcp.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
private class WorkerRunnable extends Observable implements Runnable {
private Socket clientSocket = null;
WorkerRunnable(Socket clientSocket) {
this.clientSocket = clientSocket;
}
@Override
public void run() {
try {
InputStream in = clientSocket.getInputStream();
DataInputStream dis = new DataInputStream(in);
while (true) {
int len = dis.readByte() & 0xFF;
byte[] data = new byte[len];
data[0] = (byte) len;
if (len > 0) {
dis.readFully(data, 1, len - 1);
}
setChanged();
notifyObservers(data);
}
} catch (IOException ex) {
Logger.getLogger(
AdapterTcp.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
}
private class TcpClient extends TcpElement {
Socket socket;
TcpClient(String ip, int port) {
super(port);
try {
socket = new Socket(ip, port);
} catch (IOException ex) {
Logger.getLogger(
AdapterTcp.class.getName()).log(Level.SEVERE, null, ex);
}
}
@Override
public void send(byte[] data) {
try {
OutputStream out = socket.getOutputStream();
DataOutputStream dos = new DataOutputStream(out);
dos.write(data);
} catch (IOException ex) {
Logger.getLogger(AdapterTcp.class.getName()).log(Level.SEVERE, null, ex);
}
}
@Override
public void run() {
try {
InputStream in = socket.getInputStream();
DataInputStream dis = new DataInputStream(in);
while (true) {
int len = dis.readByte() & 0xFF;
if (len > 0) {
byte[] data = new byte[len];
data[0] = (byte) len;
dis.readFully(data, 1, len - 1);
setChanged();
notifyObservers(data);
}
}
} catch (IOException ex) {
Logger.getLogger(AdapterTcp.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
}
