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Control Plane solution for Software Defined Wireless Sensor Networks
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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 } which contains all the options needed in the
* constructor of the class.
*
* @author Sebastiano Milardo
*/
public class AdapterTcp extends AbstractAdapter {
/**
* Destination ip address.
*/
private final String ip;
/**
* Boolean used to set the behaviour of the adapter. The adapter can act as
* a server or a client.
*/
private final boolean isServer;
/**
* TCP port of the adapter.
*/
private final int port;
/**
* Manages TCP connections.
*/
private InternalTcpElement tcpElement;
/**
* Creates an AdapterTCP object. The conf map is used to pass the
* configuration settings for the TPC socket as strings. Specifically the
* needed parameters are:
*
* - IS_SERVER
* - IP
* - PORT
*
*
* @param conf contains the serial port configuration data.
*/
public AdapterTcp(final Map conf) {
isServer = Boolean.parseBoolean(conf.get("IS_SERVER"));
ip = conf.get("IP");
port = Integer.parseInt(conf.get("PORT"));
}
@Override
public final boolean close() {
tcpElement.stop();
return true;
}
@Override
public final boolean open() {
if (isServer) {
tcpElement = new InternalTcpElementServer();
} else {
tcpElement = new InternalTcpElementClient();
}
tcpElement.addObserver(this);
new Thread(tcpElement).start();
return true;
}
@Override
public final void send(final byte[] data) {
tcpElement.send(data);
}
/**
* Models a generic TCP network element.
*/
private abstract class InternalTcpElement extends Observable
implements Runnable, Observer {
/**
* Manages the status of the element.
*/
private boolean isStopped;
/**
* Sends a byte array.
*
* @param data the array to be sent
*/
public abstract void send(final byte[] data);
/**
* Checks if the TCP element is still running.
*
* @return the status of the TCP element
*/
public synchronized boolean isStopped() {
return isStopped;
}
@Override
public final void update(final Observable o, final Object arg) {
setChanged();
notifyObservers(arg);
}
/**
* Stops the TCP element.
*/
public void stop() {
isStopped = true;
}
}
/**
* Models a TCP client.
*/
private class InternalTcpElementClient extends InternalTcpElement {
/**
* TCP Socket.
*/
private Socket socket;
@Override
public void send(final byte[] data) {
try {
OutputStream out = socket.getOutputStream();
DataOutputStream dos = new DataOutputStream(out);
dos.write(data);
} catch (IOException ex) {
log(Level.SEVERE, ex.toString());
}
}
@Override
public void run() {
try {
socket = new Socket(ip, port);
InputStream in = socket.getInputStream();
DataInputStream dis = new DataInputStream(in);
while (!isStopped()) {
byte[] data = new NetworkPacket(dis).toByteArray();
setChanged();
notifyObservers(data);
}
} catch (IOException ex) {
log(Level.SEVERE, ex.toString());
}
}
}
/**
* Models a TCP server.
*/
private class InternalTcpElementServer extends InternalTcpElement {
/**
* TCP server socket.
*/
private ServerSocket serverSocket = null;
/**
* A list of client sockets.
*/
private final List clientSockets = new LinkedList<>();
/**
* A list of removable client sockets.
*/
private final List removableSockets = new LinkedList<>();
@Override
public void run() {
try {
serverSocket = new ServerSocket(port);
} catch (IOException e) {
throw new UnsupportedOperationException("Cannot open port", e);
}
Socket clientSocket;
while (!isStopped()) {
try {
clientSocket = serverSocket.accept();
} catch (IOException e) {
if (isStopped()) {
return;
}
throw new UnsupportedOperationException(
"Error accepting client connection", e);
}
clientSockets.add(clientSocket);
WorkerRunnable wr = new WorkerRunnable(clientSocket);
wr.addObserver(this);
new Thread(wr).start();
}
}
@Override
public synchronized void stop() {
super.stop();
try {
serverSocket.close();
} catch (IOException e) {
throw new UnsupportedOperationException(
"Error closing server", e);
}
}
@Override
public void send(final byte[] data) {
clientSockets.stream().forEach((sck) -> {
try {
OutputStream out = sck.getOutputStream();
DataOutputStream dos = new DataOutputStream(out);
dos.write(data);
} catch (IOException ex) {
log(Level.SEVERE, ex.toString());
removableSockets.add(sck);
}
});
if (!removableSockets.isEmpty()) {
clientSockets.removeAll(removableSockets);
removableSockets.clear();
}
}
/**
* Notifies the observes that a new packet has arrived.
*/
private class WorkerRunnable extends Observable implements Runnable {
/**
* Reference to the clientSocket.
*/
private final Socket clientSocket;
/**
* Creates a new WorkerRunnable given a clientSocket.
*
* @param socket the clientSocket
*/
WorkerRunnable(final Socket socket) {
clientSocket = socket;
}
@Override
public void run() {
try {
InputStream in = clientSocket.getInputStream();
DataInputStream dis = new DataInputStream(in);
while (!isStopped()) {
byte[] data = new NetworkPacket(dis).toByteArray();
setChanged();
notifyObservers(data);
}
} catch (IOException ex) {
log(Level.SEVERE, ex.toString());
}
}
}
}
}
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