Develop Reference

Async Error FIx Needed with GeoCoder

Don't understand how to fix this error in my code, "Method getText must be called from the UI thread, currently inferred thread is worker more... (⌘F1)".
In this line, String name = addressEdit.getText().toString(); the portion "addressEdit.getText()" is underlined.
I've looked and found similar but the solutions are directly applicable.
CODE BELOW -
private class GeocodeAsyncTask extends AsyncTask {
String errorMessage = "";
#Override
protected void onPreExecute() {
}
#Override
protected Address doInBackground(Void... none) {
Geocoder geocoder = new Geocoder(MainActivity.this, Locale.getDefault());
List<Address> addresses = null;
if (fetchType == USE_ADDRESS_NAME) {
String name = addressEdit.getText().toString();
try {
addresses = geocoder.getFromLocationName(name, 1);
} catch (IOException e) {
errorMessage = "Service not available";
Log.e(TAG, errorMessage, e);
}
} else {
errorMessage = "Unknown Type";
Log.e(TAG, errorMessage);
}
if (addresses != null && addresses.size() > 0)
return addresses.get(0);
return null;
}
Thanks in advance for your help!

How can i find my pc local ip address on my wireless network and pass the ip to my android device?

To find the ip address of the pc i'm using with c#
In the constructor:
localipadd = GetLocalIPAddress();
And the GetLocalIPAdress method:
public static string GetLocalIPAddress()
{
var host = Dns.GetHostEntry(Dns.GetHostName());
foreach (var ip in host.AddressList)
{
if (ip.AddressFamily == AddressFamily.InterNetwork)
{
return ip.ToString();
}
}
throw new Exception("Local IP Address Not Found!");
}
For example i'm getting the ip 10.0.01
Now the problem is how can i transfer this ip address string to my android device ?
The reason i need to do it is that on the c# i'm running a web server:
In the constructor:
var ws = new WebServer(
request => Task.Run(() => SendResponseAsync(request)),
"http://+:8098/");
ws.Run();
And the WebServer class:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net;
using System.Threading;
namespace Automatic_Record
{
class WebServer
{
private readonly HttpListener _listener = new HttpListener();
private readonly Func<HttpListenerRequest, Task<string>> _responderMethod;
public WebServer(string[] prefixes, Func<HttpListenerRequest, Task<string>> method)
{
if (!HttpListener.IsSupported)
throw new NotSupportedException(
"Needs Windows XP SP2, Server 2003 or later.");
// URI prefixes are required, for example
// "http://localhost:8080/index/".
if (prefixes == null || prefixes.Length == 0)
throw new ArgumentException("prefixes");
// A responder method is required
if (method == null)
throw new ArgumentException("method");
foreach (string s in prefixes)
_listener.Prefixes.Add(s);
_responderMethod = method;
_listener.Start();
}
public WebServer(Func<HttpListenerRequest, Task<string>> method, params string[] prefixes)
: this(prefixes, method) { }
public void Run()
{
ThreadPool.QueueUserWorkItem((o) =>
{
Console.WriteLine("Webserver running...");
try
{
while (_listener.IsListening)
{
ThreadPool.QueueUserWorkItem(async (c) =>
{
var ctx = c as HttpListenerContext;
try
{
string rstr = await _responderMethod(ctx.Request);
System.Diagnostics.Trace.Write(ctx.Request.QueryString);
//ctx.Request.QueryString
byte[] buf = Encoding.UTF8.GetBytes(rstr);
ctx.Response.ContentLength64 = buf.Length;
ctx.Response.OutputStream.Write(buf, 0, buf.Length);
System.Data.SqlClient.SqlConnectionStringBuilder builder = new System.Data.SqlClient.SqlConnectionStringBuilder();
}
catch { } // suppress any exceptions
finally
{
// always close the stream
ctx.Response.OutputStream.Close();
}
}, _listener.GetContext());
}
}
catch { } // suppress any exceptions
});
}
public void Stop()
{
_listener.Stop();
_listener.Close();
}
}
}
And on my android device using android studio i did a client that connect to the pc web server. Today what i'm doing is finding on my own the pc ip address and assign it to the android studio.
In the MainActivity:
private String[] ipaddresses = new String[]{
"http://10.0.0.1:8098/?cmd=nothing",
"http://192.168.1.5:8098/?cmd=nothing"};
And then a button listen method with button click Listener:
public void addListenerOnButton()
{
btnClick = (Button) findViewById(R.id.checkipbutton);
btnClick.setOnClickListener(new OnClickListener()
{
byte[] response = null;
#Override
public void onClick(View arg0)
{
text = (TextView) findViewById(R.id.textView2);
Thread t = new Thread(new Runnable()
{
#Override
public void run()
{
for (int i = 0; i < ipaddresses.length; i++)
{
counter = i;
try
{
response = Get(ipaddresses[i]);
} catch (Exception e)
{
String err = e.toString();
}
if (response != null)
{
try
{
final String a = new String(response, "UTF-8");
text.post(new Runnable()
{
#Override
public void run()
{
text.setText(a + " On \n" + ipaddresses[counter]);
status1.setText("Connected");
String successconnected = null;
successconnected = "Successfully connected";
textforthespeacch = successconnected;
MainActivity.this.initTTS();
}
});
iptouse = ipaddresses[i].substring(0, ipaddresses[i].lastIndexOf("=") + 1);
connectedtoipsuccess = true;
connectedSuccess = true;
Logger.getLogger("MainActivity(inside thread)").info(a);
} catch (UnsupportedEncodingException e)
{
e.printStackTrace();
Logger.getLogger("MainActivity(inside thread)").info("encoding exception");
}
Logger.getLogger("MainActivity(inside thread)").info("test1");
break;
}
else
{
}
}
counter = 0;
if (response == null)
{
text.post(new Runnable()
{
#Override
public void run()
{
text.setText("Connection Failed");
status1.setText("Connection Failed");
String successconnected = null;
successconnected = "connection failed";
textforthespeacch = successconnected;
MainActivity.this.initTTS();
}
});
}
}
});
t.start();
}
});
}
So this is how it work today:
I went to my living room and there i added to my router my pc static ip.
Then i went to my pc room i have another router with another network and i added there the pc static ip too.
And then added both ip's to the android studio code and then i'm looping over the array to see the one that connected and then i know this is the right ip to use.
The problem is that i can't ask the user/s to assign to the router a static ip and then fill the android studio with the array.....
What i need to do is somehow to assign the pc ip automatic to the android studio(to my android device) so it will be able to use it.
So i know using the c# to find my pc ip but how do i pass it to the android device and use it ?
I could scan make a scan on the android studio something that will scan all the ips from 0 to 255 and then to try to identify the one that is the pc but this might take a very long time.
Another option maybe could be sending the ip i found on my pc using the c# via gmail and get it with the android studio from the gmail and add it to the array ? Is that logic ?

Device discovery over Wifi for defined period of time

I am writing a code to send a UDP Multicast over Wifi from my mobile device. There is a server code running on other devices in the network. The servers will listen to the multicast and respond with their IP Address and Type of the system (Type: Computer, Mobile Device, Raspberry Pi, Flyports etc..)
On the mobile device which has sent the UDP Multicast, I need to get the list of the devices responding to the UDP Multicast.
For this I have created a class which will work as the structure of the device details.
DeviceDetails.class
public class DeviceDetails
{
String DeviceType;
String IPAddr;
public DeviceDetails(String type, String IP)
{
this.DeviceType=type;
this.IPAddr=IP;
}
}
I am sending the UDP Multicast packet at the group address of 225.4.5.6 and Port Number 5432.
I have made a class which will call a thread which will send the UDP Packets. And on the other hand I have made a receiver thread which implements Callable Interface to return the list of the devices responding.
Here is the code:
MulticastReceiver.java
public class MulticastReceiver implements Callable<DeviceDetails>
{
DatagramSocket socket = null;
DatagramPacket inPacket = null;
boolean check = true;
public MulticastReceiver()
{
try
{
socket = new DatagramSocket(5500);
}
catch(Exception ioe)
{
System.out.println(ioe);
}
}
#Override
public DeviceDetails call() throws Exception
{
// TODO Auto-generated method stub
try
{
byte[] inBuf = new byte[WifiConstants.DGRAM_LEN];
//System.out.println("Listening");
inPacket = new DatagramPacket(inBuf, inBuf.length);
if(check)
{
socket.receive(inPacket);
}
String msg = new String(inBuf, 0, inPacket.getLength());
Log.v("Received: ","From :" + inPacket.getAddress() + " Msg : " + msg);
DeviceDetails device = getDeviceFromString(msg);
Thread.sleep(100);
return device;
}
catch(Exception e)
{
Log.v("Receiving Error: ",e.toString());
return null;
}
}
public DeviceDetails getDeviceFromString(String str)
{
String type;
String IP;
type=str.substring(0,str.indexOf('`'));
str = str.substring(str.indexOf('`')+1);
IP=str;
DeviceDetails device = new DeviceDetails(type,IP);
return device;
}
}
The following code is of the activity which calls the Receiver Thread:
public class DeviceManagerWindow extends Activity
{
public void searchDevice(View view)
{
sendMulticast = new Thread(new MultiCastThread());
sendMulticast.start();
ExecutorService executorService = Executors.newFixedThreadPool(1);
List<Future<DeviceDetails>> deviceList = new ArrayList<Future<DeviceDetails>>();
Callable<DeviceDetails> device = new MulticastReceiver();
Future<DeviceDetails> submit = executorService.submit(device);
deviceList.add(submit);
DeviceDetails[] devices = new DeviceDetails[deviceList.size()];
int i=0;
for(Future<DeviceDetails> future :deviceList)
{
try
{
devices[i] = future.get();
}
catch(Exception e)
{
Log.v("future Exception: ",e.toString());
}
}
}
}
Now the standard way of receiving the packet says to call the receive method under an infinite loop. But I want to receive the incoming connections only for first 30seconds and then stop looking for connections.
This is similar to that of a bluetooth searching. It stops after 1 minute of search.
Now the problem lies is, I could use a counter but the problem is thread.stop is now depricated. And not just this, if I put the receive method under infinite loop it will never return the value.
What should I do.? I want to search for say 30 seconds and then stop the search and want to return the list of the devices responding.

Instead of calling stop(), you should call interrupt(). This causes a InterruptedException to be thrown at interruptable spots at your code, e.g. when calling Thread.sleep() or when blocked by an I/O operation. Unfortunately, DatagramSocket does not implement InterruptibleChannel, so the call to receive cannot be interrupted.
So you either use DatagramChannel instead of the DatagramSocket, such that receive() will throw a ClosedByInterruptException if Thread.interrupt() is called. Or you need to set a timeout by calling DatagramSocket.setSoTimeout() causing receive() to throw a SocketTimeoutException after the specified interval - in that case, you won't need to interrupt the thread.
Simple approach
The easiest way would be to simply set a socket timeout:
public MulticastReceiver() {
try {
socket = new DatagramSocket(5500);
socket.setSoTimeout(30 * 1000);
} catch (Exception ioe) {
throw new RuntimeException(ioe);
}
}
This will cause socket.receive(inPacket); to throw a SocketTimeoutException after 30 seconds. As you already catch Exception, that's all you need to do.
Making MulticastReceiver interruptible
This is a more radical refactoring.
public class MulticastReceiver implements Callable<DeviceDetails> {
private DatagramChannel channel;
public MulticastReceiver() {
try {
channel = DatagramChannel.open();
channel.socket().bind(new InetSocketAddress(5500));
} catch (IOException ioe) {
throw new RuntimeException(ioe);
}
}
public DeviceDetails call() throws Exception {
ByteBuffer inBuf = ByteBuffer.allocate(WifiConstants.DGRAM_LEN);
SocketAddress socketAddress = channel.receive(inBuf);
String msg = new String(inBuf.array(), 0, inBuf.capacity());
Log.v("Received: ","From :" + socketAddress + " Msg : " + msg);
return getDeviceFromString(msg);;
}
}
The DeviceManagerWindow looks a bit different; I'm not sure what you intend to do there, as you juggle around with lists and arrays, but you only have one future... So I assume you want to listen for 30 secs and fetch as many devices as possible.
ExecutorService executorService = Executors.newFixedThreadPool(1);
MulticastReceiver receiver = new MulticastReceiver();
List<DeviceDetails> devices = new ArrayList<DeviceDetails>();
long runUntil = System.currentTimeMillis() + 30 * 1000;
while (System.currentTimeMillis() < runUntil) {
Future<Object> future = executorService.submit(receiver);
try {
// wait no longer than the original 30s for a result
long timeout = runUntil - System.currentTimeMillis();
devices.add(future.get(timeout, TimeUnit.MILLISECONDS));
} catch (Exception e) {
Log.v("future Exception: ",e.toString());
}
}
// shutdown the executor service, interrupting the executed tasks
executorService.shutdownNow();
That's about it. No matter which solution you choose, don't forget to close the socket/channel.

I have solved it.. you can run your code in following fashion:
DeviceManagerWindow.java
public class DeviceManagerWindow extends Activity
{
public static Context con;
public static int rowCounter=0;
Thread sendMulticast;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_device_manager_window);
WifiManager wifi = (WifiManager)getSystemService( Context.WIFI_SERVICE );
if(wifi != null)
{
WifiManager.MulticastLock lock = wifi.createMulticastLock("WifiDevices");
lock.acquire();
}
TableLayout tb = (TableLayout) findViewById(R.id.DeviceList);
tb.removeAllViews();
con = getApplicationContext();
}
public void searchDevice(View view) throws IOException, InterruptedException
{
try
{
sendMulticast = new Thread(new MultiCastThread());
sendMulticast.start();
sendMulticast.join();
}
catch(Exception e)
{
Log.v("Exception in Sending:",e.toString());
}
here is the time bound search.... and you can quit your thread using thread.join
//Device Will only search for 1 minute
for(long stop=System.nanoTime()+TimeUnit.SECONDS.toNanos(1); stop>System.nanoTime();)
{
Thread recv = new Thread(new MulticastReceiver());
recv.start();
recv.join();
}
}
public static synchronized void addDevice(DeviceDetails device) throws InterruptedException
{
....
Prepare your desired list here.
....
}
}
Dont add any loop on the listening side. simply use socket.receive
MulticastReceiver.java
public class MulticastReceiver implements Runnable
{
DatagramSocket socket = null;
DatagramPacket inPacket = null;
public MulticastReceiver()
{
try
{
socket = new DatagramSocket(WifiConstants.PORT_NO_RECV);
}
catch(Exception ioe)
{
System.out.println(ioe);
}
}
#Override
public void run()
{
byte[] inBuf = new byte[WifiConstants.DGRAM_LEN];
//System.out.println("Listening");
inPacket = new DatagramPacket(inBuf, inBuf.length);
try
{
socket.setSoTimeout(3000)
socket.receive(inPacket);
String msg = new String(inBuf, 0, inPacket.getLength());
Log.v("Received: ","From :" + inPacket.getAddress() + " Msg : " + msg);
DeviceDetails device = getDeviceFromString(msg);
DeviceManagerWindow.addDevice(device);
socket.setSoTimeout(3000)will set the listening time for the socket only for 3 seconds. If the packet dont arrive it will go further.DeviceManagerWindow.addDevice(device);this line will call the addDevice method in the calling class. where you can prepare your list
}
catch(Exception e)
{
Log.v("Receiving Error: ",e.toString());
}
finally
{
socket.close();
}
}
public DeviceDetails getDeviceFromString(String str)
{
String type;
String IP;
type=str.substring(0,str.indexOf('`'));
str = str.substring(str.indexOf('`')+1);
IP=str;
DeviceDetails device = new DeviceDetails(type,IP);
return device;
}
}
Hope that works.. Well it will work.
All the best. Let me know if any problem.

how to read each string from the inputStream in java

I am trying to send accelerator values over bluetooth from an Android App to the PC. I am working on the BluetoothChat demo application. In the Android App I have a method called onSensorChanged that will be called every time when the accelerations changes. the method looks like below:
#Override
public void onSensorChanged(SensorEvent e) {
// the work done when the accelerometer data changes
try {
Thread.sleep(25);
} catch (InterruptedException e1) {
e1.printStackTrace();
}
sensorX = e.values[0];
sensorY = e.values[1];
Toast.makeText(BluetoothChat.this, "x coordinate = " + sensorX + "y coordinate = " + sensorY Toast.LENGTH_SHORT).show();
BigDecimal sensorXDec = new BigDecimal(e.values[0]).setScale(2,BigDecimal.ROUND_HALF_UP);
BigDecimal sensorYDec = new BigDecimal(e.values[1]).setScale(2,BigDecimal.ROUND_HALF_UP);
String vals = String.valueOf(sensorXDec.toPlainString() + "," + sensorYDec.toPlainString());
mChatService.writeFromString(vals);
}
The method writeFromString
public void writeFromString(String temp){
// Create temporary object
ConnectedThread r;
// Synchronize a copy of the ConnectedThread
synchronized (this) {
if (mState != STATE_CONNECTED) return;
r = mConnectedThread;
}
// Perform the write unsynchronized
r.writeString(temp);
}
and the writeString method is the following:
public void writeString(String out) {
try {
if(D) Log.d(TAG, "Sending File....AS STRING");
mmOutStream.write(out.getBytes(), 0, out.getBytes().length);
} catch (IOException e) {
Log.e(TAG, "Exception during write", e);
}
}
in the following method I process the inputStream on the PC side
#Override
public void run() {
try {
// prepare to receive data
InputStream inputStream = mConnection.openInputStream();
System.out.println("waiting for input");
while (true) {
int command = inputStream.read();
if (command == EXIT_CMD)
{
System.out.println("finish process");
break;
}
processCommand(command);
}
} catch (Exception e) {
e.printStackTrace();
}
}
The question again is: How can I retrieve each set of Strings I am sending from the Android App?

Try this
String msg = null;
BufferedReader br = new BufferedReader(
new InputStreamReader(inputStream)
);
msg = br.readLine();
This will solve problem

Scanner scanner = new Scanner (inputStream);
while(true){
if(!scanner.hasNextInt()){
continue;
}
// at this point we've got an int, so get it and use it
try{
int commmand = scanner.nextInt();
if (command == EXIT_CMD){
System.out.println("finish process");
break;
}
processCommand(command);
} catch (Exception catchThem){
// Deal with the caught exceptions
}
}
I didn't test this, hope it works for you.

Java - Human playable Server/Client Multiplayer

I'm currently trying to implement the game of Nim using Java, I want to be able to have one player act as the server and another as the player.
I'm fairly new to Java networking and have only had experience using basic TCP/IP where the human client connects to a computer host.
The trouble I'm having is that I need to be able to differentiate between the different players whilst implementing the protocol for the game (The protocol being the logic for the game).
As it stands I can let one player (Client) interact with the Server. All that happens is the Client can play the game but there is no oppostion (The Server merely tracks the state of the game e.g. How many sticks left, valid input etc..).
How would I go about adding a second player to take the place of the host?
Edit:
The Client and Server code has been posted, it is the code I have used and I'm quite comfortable with, the question I am asking is would it be a suitable base to implement a multi-player game or would I need to do something completely different?
My Nim Protocol: (Untested)
public class NimLogic
{
private static final int WAITING = 0;
private static final int EVALUATING = 1;
private static final int ANOTHER = 2;
private int currentState = WAITING;
private int theInput = 0;
private int totalSticks = 10;
String processInput(String input) {
String theOutput = null;
try
{
theInput = Integer.parseInt(input);
}
catch (Exception e)
{
// Ignore conversion error
}
switch (currentState)
{
case WAITING:
theOutput = "Take how many sticks?";
currentState = EVALUATING;
break;
case EVALUATING:
if(theInput == 1 | theInput == 2 | theInput == 3)
{
if (theInput < totalSticks)
{
totalSticks -= theInput;
theOutput = "There are" + totalSticks + " left.";
}
else if (theInput > totalSticks)
{
theOutput = "Error: You cannot take more sticks than that are available";
currentState = EVALUATING;
}
}
if(totalSticks == 1)
{
theOutput = "Game Over! Play again? (Yes = 1, No = 0)...";
currentState = ANOTHER;
}
break;
case ANOTHER:
if (theInput == 1)
{
totalSticks = 10;
currentState = EVALUATING;
theOutput = "Take how many sticks?";
}
else
{
theOutput = "Bye.";
}
}
return theOutput;
}
}
Thanks for all the help!
Edit:
Client
public class Client
{
#SuppressWarnings("static-access")
public static void main(String machine[])
{
Socket kkSocket = null;
PrintStream os = null;
DataInputStream is = null;
try
{
kkSocket = new Socket(machine[0], 4444);
os = new PrintStream(kkSocket.getOutputStream());
is = new DataInputStream(kkSocket.getInputStream());
}
catch(UnknownHostException e)
{
System.err.println("Socket Connect failed on " + machine[0]);
}
catch (IOException e)
{
System.err.println("Streams failed on " + machine[0]);
}
if (kkSocket != null && os != null && is != null )
{
try
{
String fromServer, fromClient;
while((fromServer = is.readLine()) != null && !fromServer.equals("Bye."))
{
fromClient = JOptionPane.showInputDialog(fromServer);
os.println(fromClient);
}
JOptionPane.showMessageDialog(null, "Goodbye, keep smiling.");
os.close();
is.close();
kkSocket.close();
}
catch (UnknownHostException e)
{
System.err.println("Can't connect to " + machine[0] + e);
}
catch (IOException e)
{
e.printStackTrace();
System.err.println("I/O failed on " +machine[0]);
}
}
}
}
Server
public class Server
{
public static void main(String arg[])
{
ServerSocket serverSocket = null;
try
{
serverSocket = new ServerSocket(4444);
}
catch (IOException e)
{
System.err.println("Can't listen on 4444 -> " + e);
System.exit(1);
}
Socket clientSocket = null;
try // allow the client to connect
{
clientSocket = serverSocket.accept();
}
catch (IOException e)
{
System.err.println("Failed accept on 4444 -> " + e);
System.exit(1);
}
try
{
DataInputStream is =
new DataInputStream(new BufferedInputStream
(clientSocket.getInputStream()));
PrintStream os =
new PrintStream(new BufferedOutputStream
(clientSocket.getOutputStream(), 1024), false);
GuessState kks = new GuessState();
String inputLine, outputLine;
outputLine = kks.processInput(null);
os.println(outputLine);
os.flush();
while((inputLine = is.readLine()) != null
&& !outputLine.equals("Bye."))
{
outputLine = kks.processInput(inputLine);
os.println(outputLine);
os.flush();
}
os.close();
is.close();
clientSocket.close();
serverSocket.close();
}
catch (IOException e)
{
e.printStackTrace();
}
}
}

I'm not quite sure if I'm answering your question here, so apologies if I'm not. Also, it's been a little while since I did any Java networking code, so there might be a few wrinkles here which hopefully others can sort out.
The following is a bit of a brain dump of the changes I'd probably make, for better or worse...
Rework the networking code to accept multiple connections. Normally you'd do this by handing off the socket returned by ServerSocket.accept to a thread to process. If you were dealing with a lot of connections, you could do it using NIO instead, but that's probably too far to fast for now.
Separate the game state from the client conversation code. To keep things simple, embed the client conversation code in the thread object. The game state needs to be in an object that's shared between all the threads servicing the socket.
I'd recommend making the game state a proper 'domain object' rather than having it parsing strings etc. It should have operations like 'take(clientID, int)' rather than 'processInput'.
Consider using the observer pattern to distribute events from the domain object to the socket threads. Examples of events might be 'turnTaken' or 'gameComplete'.
Embed the notion of 'turns' into the game object, and have the server broadcast an event to the socket threads announcing whose turn it is.
Hope that gives you a starter for ten?

The server/client aspect should have no bearing on the communication of the two players. You should be able to spawn two instances of the Nim game, one that listen for an incoming connection on some port(Server), and one that connects to it (Client). Once the connection is established, you can pass Objects between the two instances over your connection that represent game information. Each instance of your Nim game is responsible for parsing that game data and running the Nim logic on it.
In essence, each instance of the game can run as a server or a client. Here's some code I wrote for Chess that should be applicable. Read through it. Elsewhere I instance a Server or Client and store it in a reference of type NetworkIdenitity.
private abstract class NetworkEntity
extends Thread {
ObjectOutputStream outputStream;
ObjectInputStream inputStream;
Socket connectionHandle;
Object messageToSend;
Object receivedMessage;
public NetworkEntity(final String name) {
super(name);
}
#Override
public abstract void run();
public void getStreams()
throws IOException {
this.outputStream = new ObjectOutputStream(this.connectionHandle.getOutputStream());
this.outputStream.flush();
this.inputStream = new ObjectInputStream(this.connectionHandle.getInputStream());
}
public void closeConnection() {
try {
if (this.outputStream != null) {
this.outputStream.close();
}
if (this.inputStream != null) {
this.inputStream.close();
}
if (this.connectionHandle != null) {
this.connectionHandle.close();
chatPanel.writeToDisplay("Connection closed with "
+ this.connectionHandle.getInetAddress().getHostName());
}
}
catch (final IOException e) {
JOptionPane.showMessageDialog(thisFrame, "Problems experienced when closing connection",
"Notification", JOptionPane.ERROR_MESSAGE);
}
}
public void processIncomingData()
throws IOException {
do {
try {
this.receivedMessage = this.inputStream.readObject();
}
catch (final ClassNotFoundException e) {
JOptionPane.showMessageDialog(thisFrame, "read() error: message from "
+ this.connectionHandle.getInetAddress().getHostName() + " not received", "Notification",
JOptionPane.ERROR_MESSAGE);
}
if (this.receivedMessage instanceof Move) {
final Move m = (Move) this.receivedMessage;
System.out.println(getName() + " got move" + m);
requestMove(Table.this.chessBoard, Table.this.currentPlayer, Table.this.currentOpponent, m, false);
repaint();
}
else if (this.receivedMessage instanceof Board) {
final Board b = (Board) this.receivedMessage;
System.out.println(getName() + " received this board:");
b.printCurrentBoardState();
// System.out.println("local copy looked like this: " );
// chessBoard.printCurrentBoardState();
// chessBoard.setGameBoard(b.getGameBoard());
// switchCurrentPlayer();
// chessBoard.updateBoardState(currentPlayer,
// currentOpponent);
repaint();
}
else if (this.receivedMessage instanceof String) {
chatPanel.writeToDisplay((String) this.receivedMessage);
}
} while (/* !message.equals("SERVER>>> TERMINATE") */true);
}
public void sendData(final Object obj_to_send) {
try {
this.outputStream.writeObject(obj_to_send);
this.outputStream.flush();
}
catch (final IOException e) {
}
}
}
private final class Client
extends NetworkEntity {
private final String hostName;
private final int serverPort;
public Client(final String host, final int port) {
super("CLIENT");
this.hostName = host;
this.serverPort = port;
}
#Override
public void run() {
try {
connectToServer();
getStreams();
processIncomingData();
}
catch (final EOFException eof) {
}
catch (final IOException ioe) {
}
catch (final NullPointerException npe) {
}
finally {
closeConnection();
}
}
private void connectToServer()
throws IOException {
try {
this.connectionHandle = new Socket(InetAddress.getByName(this.hostName), this.serverPort);
connectionEstablished = true;
chatPanel.writeToDisplay("Successfully connected to "
+ this.connectionHandle.getInetAddress().getHostName());
}
catch (final IOException e) {
chatPanel.writeToDisplay("Failed to connect to: " + this.hostName);
}
}
}
private final class Server
extends NetworkEntity {
private ServerSocket server;
private final int listenPort;
public Server(final int listen_port) {
super("SERVER");
this.listenPort = listen_port;
}
#Override
public void run() {
try {
this.server = new ServerSocket(this.listenPort, 1);
chatPanel.writeToDisplay("Listening on port " + this.listenPort);
try {
waitForConnection();
getStreams();
processIncomingData();
}
catch (final EOFException eof) {
// System.out.println(getName() + "exception: " +eof);
// eof.printStackTrace();
}
catch (final IOException ioe) {
// System.out.println(getName() + "exception: " +ioe);
// ioe.printStackTrace();
}
finally {
closeConnection();
}
}
catch (final IOException e) {
JOptionPane.showMessageDialog(thisFrame, "Network Error: " + e, "Notification",
JOptionPane.ERROR_MESSAGE);
}
}
private void waitForConnection()
throws IOException {
this.connectionHandle = this.server.accept();
connectionEstablished = true;
chatPanel.writeToDisplay("Connection received from:" + this.connectionHandle.getInetAddress().getHostName());
}
#Override
public void closeConnection() {
super.closeConnection();
try {
this.server.close();
}
catch (final IOException e) {
chatPanel.writeToDisplay(getName() + "failed to disconnect from the network");
}
}