public static void main(String[] args) throws Exception {
startServer();
try {
doClientSide();
} catch (SocketException e) {
if (!e.getMessage().equalsIgnoreCase("Socket closed")) {
throw new Exception("Received a wrong exception message: " + e.getMessage());
}
System.out.println("PASSED: received the right exception message: " + e.getMessage());
}
if (serverException != null) {
throw serverException;
}
}
public static void main(String args[]) {
DatagramSocket aSocket = null;
try {
aSocket = new DatagramSocket();
String stringMsg = "0";
String prevReply = "0";
InetAddress aHost =
InetAddress.getByName("localhost"); // recieve a message from the same computer
int serverPort = 6789; // agreed port
while (true) {
stringMsg = "" + (Integer.parseInt(stringMsg) + 1);
byte[] message = stringMsg.getBytes();
DatagramPacket request = new DatagramPacket(message, message.length, aHost, serverPort);
System.out.printf("Producer: Sending: %s\n", stringMsg);
aSocket.send(request); // send a message
byte[] buffer = new byte[1000];
DatagramPacket reply = new DatagramPacket(buffer, buffer.length);
aSocket.receive(reply); // wait for a reply
try {
Thread.sleep(2000); // have a small waiting period
} catch (InterruptedException e) {
}
}
} catch (SocketException e) {
System.out.println("Socket: " + e.getMessage());
} catch (IOException e) {
System.out.println("IO: " + e.getMessage());
} finally {
if (aSocket != null) aSocket.close();
}
}
/**
* Initializes and binds a socket that on a random port number. The method would try to bind on a
* random port and retry 5 times until a free port is found.
*
* @return the socket that we have initialized on a randomport number.
*/
private DatagramSocket initRandomPortSocket() {
DatagramSocket resultSocket = null;
String bindRetriesStr =
NetaddrActivator.getConfigurationService().getString(BIND_RETRIES_PROPERTY_NAME);
int bindRetries = 5;
if (bindRetriesStr != null) {
try {
bindRetries = Integer.parseInt(bindRetriesStr);
} catch (NumberFormatException ex) {
logger.error(
bindRetriesStr
+ " does not appear to be an integer. "
+ "Defaulting port bind retries to "
+ bindRetries,
ex);
}
}
int currentlyTriedPort = NetworkUtils.getRandomPortNumber();
// we'll first try to bind to a random port. if this fails we'll try
// again (bindRetries times in all) until we find a free local port.
for (int i = 0; i < bindRetries; i++) {
try {
resultSocket = new DatagramSocket(currentlyTriedPort);
// we succeeded - break so that we don't try to bind again
break;
} catch (SocketException exc) {
if (exc.getMessage().indexOf("Address already in use") == -1) {
logger.fatal(
"An exception occurred while trying to create" + "a local host discovery socket.",
exc);
resultSocket = null;
return null;
}
// port seems to be taken. try another one.
logger.debug("Port " + currentlyTriedPort + " seems in use.");
currentlyTriedPort = NetworkUtils.getRandomPortNumber();
logger.debug("Retrying bind on port " + currentlyTriedPort);
}
}
return resultSocket;
}
/**
* Main method keeps waiting for request and do math operation accordingly
*
* @param args
*/
public static void main(String args[]) {
DatagramSocket aSocket = null;
try {
aSocket = new DatagramSocket(6789);
byte[] buffer = new byte[1000];
while (true) {
DatagramPacket request = new DatagramPacket(buffer, buffer.length);
aSocket.receive(request);
// receive byte array of equation and put it in string
String equation = new String(request.getData());
String answer = "";
String[] split = equation.split(" ");
// parse to integer and calculate
String op = split[1];
double var1 = Double.parseDouble(split[0]);
double var2 = Double.parseDouble(split[2]);
if (op.equals("+")) {
answer = Double.toString(var1 + var2);
} else if (op.equals("-")) {
answer = Double.toString(var1 - var2);
} else if (op.toLowerCase().equals("X") || op.toLowerCase().equals("x")) {
answer = Double.toString(var1 * var2);
} else if (op.equals("/")) {
answer = Double.toString(var1 / var2);
}
// send answer back
DatagramPacket reply =
new DatagramPacket(
answer.getBytes(),
(answer.getBytes()).length,
request.getAddress(),
request.getPort());
aSocket.send(reply);
}
} catch (SocketException e) {
System.out.println("Socket: " + e.getMessage());
} catch (IOException e) {
System.out.println("IO: " + e.getMessage());
} finally {
if (aSocket != null) {
aSocket.close();
}
}
}
public void run() {
while (Thread.currentThread() == thread) {
try {
Socket socket = server.accept();
Client client = new Client(parent, socket);
if (clientValidationMethod != null) {
try {
clientValidationMethod.invoke(parent, new Object[] {this, client});
} catch (Exception e) {
// System.err.println("Disabling serverEvent() for port " + port);
e.printStackTrace();
}
}
if (client.active()) {
synchronized (clients) {
addClient(client);
if (serverEventMethod != null) {
try {
serverEventMethod.invoke(parent, new Object[] {this, client});
} catch (Exception e) {
// System.err.println("Disabling serverEvent() for port " + port);
e.printStackTrace();
}
}
}
}
} catch (SocketException e) {
// thrown when server.close() is called and server is waiting on accept
System.err.println("Server SocketException: " + e.getMessage());
thread = null;
} catch (IOException e) {
// errorMessage("run", e);
e.printStackTrace();
thread = null;
}
try {
Thread.sleep(8);
} catch (InterruptedException ex) {
}
}
}
@Override
public void run() {
while (true) {
try {
String wsName = EncodeDecode.decodeString(receive());
Integer paramCnt = Integer.parseInt(EncodeDecode.decodeString(receive()));
String params[] = new String[paramCnt];
for (int i = 0; i < paramCnt; i++) {
params[i] = EncodeDecode.decodeString(receive());
}
String result = internal_call(wsName, params);
send(EncodeDecode.encode(result));
} catch (NumberFormatException e) {
logger.info("number format error");
return;
} catch (SocketException e) {
logger.info("socket " + e.getMessage());
return;
}
}
}
public boolean makeconnection() {
if (serversoc == null || serversoc.isClosed()) {
try {
serversoc = new ServerSocket(portnum);
serversoc.setSoTimeout(0);
} catch (IOException ex) {
logger.warning(ex.getMessage());
}
}
try {
System.out.println("server waiting");
mysocket = serversoc.accept();
in = mysocket.getInputStream();
out = mysocket.getOutputStream();
oos = new ObjectOutputStream(out);
ois = new ObjectInputStream(in);
System.out.println("connection established");
waitforreceivingdata();
return true;
} catch (SocketException ex) {
logger.warning(ex.getMessage());
return false;
} catch (IOException ex) {
logger.warning(ex.getMessage());
return false;
} catch (Exception ex) {
logger.warning(ex.getMessage());
return false;
}
}
/**
* Create a multicast socket and join the multicast group. This method creates a multicast socket
* that is used to broadcast The <CODE>DiscoveryResponder</CODE> will then join the multicast
* group and send a join message. This method has no effect if the <CODE>DiscoveryResponder</CODE>
* is <CODE>ONLINE</CODE> or <CODE>STOPPING</CODE> or <CODE>STARTING</CODE>.
*
* @exception IOException The creation of the Multicast socket failed.
*/
public void start() throws IOException {
if (state == OFFLINE) {
changeState(STARTING);
if (cmf == null) {
if (logger.finerOn()) {
logger.finer("start ", "Can't start discoveryResponder: JDMK MBeanServer is not set");
}
return;
}
// ----------------
// Create a new obj to receive multicast msg ;
// ----------------
try {
if (logger.finerOn()) {
logger.finer("start ", "Create a new responder");
}
responder =
new ActualResponder(multicastGroup, multicastPort, getTimeToLive(), cmf, spy, this);
if (local != null) {
responder.setLocalHost(local);
}
// NPCTE fix for bugId 4499338, esc 0, 04 Sept 2001
if (usrInet != null) {
responder.setInterface(usrInet);
if (logger.finerOn()) {
logger.finer("start ", "set interface to " + usrInet);
}
}
// end of NPCTE fix for bugId 4499338
if (noEvent != null) responder.noEvent();
if (logger.finerOn()) {
logger.finer("start ", "call responder connect");
}
responder.connectToGroup();
// ----------------
// Create a new thread to receive multicast msg ;
// ----------------
// responderThread = cmf.getThreadAllocatorSrvIf().obtainThread(responderObjectName,
// responder);
responderThread = new Thread(responder);
responderThread.setName("Multicast responder");
// ----------------
// Start thread
// ----------------
responderThread.start();
// ----------------
// Update state
// ----------------
// changeState(ONLINE) ;
} catch (SocketException e) {
if (logger.finestOn()) {
logger.finest("start", e);
}
throw new IOException(e.getMessage());
} catch (IOException e) {
// ------------------------
// Keep exception for us
// ------------------------
if (logger.finestOn()) {
logger.finest("start ", e);
}
throw e;
} catch (NullPointerException e) {
// ------------------------
// the set group did not worked
// ------------------------
if (logger.finestOn()) {
logger.finest("start ", e);
}
throw new IOException(e.getMessage());
}
} else {
if (logger.finerOn()) {
logger.finer("start ", "Responder is not OFFLINE");
}
}
}
