Codenameone closing a socket - codenameone

Question

There seems to be no way of disconnecting a socket without causing a connection reset error on the server side.
I'm using the com.codename1.io.Socket and com.codename1.io.SocketConnection implementations within a tester app. My code is as follows:
private SpanLabel lblStatus;
private SpanLabel lblIncoming;
private CustomSocketConnection con;
private Thread tIncoming;
public ConnectForm() {
con = getSocketConnection();
Button btnConnect = getConnectButton();
Button btnDisconnect = getDisconnectButton();
Button btnSendMessage = getSendMessageButton();
lblStatus = getInfoLabel();
lblIncoming = getIncomingLabel();
setLayout(new BoxLayout(BoxLayout.Y_AXIS));
addComponent(btnConnect);
addComponent(btnDisconnect);
addComponent(btnSendMessage);
addComponent(lblStatus);
addComponent(lblIncoming);
}
private Button getConnectButton() {
Button btn = new Button("Connect (localhost)");
btn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
Socket.connect("localhost", 8687, con);
}
});
return btn;
}
private Button getDisconnectButton() {
Button btn = new Button("Disconnect");
btn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
//??? I don't know how to do this
try {
tIncoming.join();
} catch (Exception e) {
e.printStackTrace();
tIncoming.interrupt();
}
}
});
return btn;
}
private Button getSendMessageButton() {
Button btn = new Button("Send Message");
btn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
try {
con.os.write("Hello".getBytes());
con.os.write(Integer.parseInt("04", 16)); //end of transmit
con.os.flush();
lblStatus.setText("Message Sent");
} catch (Exception e) {
e.printStackTrace();
}
}
});
return btn;
}
private SpanLabel getInfoLabel() {
return new SpanLabel("Disconnected");
}
private SpanLabel getIncomingLabel() {
return new SpanLabel("...");
}
private CustomSocketConnection getSocketConnection() {
return new CustomSocketConnection();
}
class CustomSocketConnection extends SocketConnection {
public OutputStream os;
public InputStream is;
#Override
public void connectionError(int errorCode, String message) {
lblStatus.setText("Error Connecting. ErrorCode: " + errorCode + " Message: " + message);
}
#Override
public void connectionEstablished(InputStream is, OutputStream os) {
lblStatus.setText("Connected :)");
this.is = is;
this.os = os;
spawnIncomingMessageWatcher();
}
}
private void spawnIncomingMessageWatcher() {
tIncoming = new Thread(new Runnable() {
public void run() {
String s = "";
int eot = Integer.parseInt("04", 16);
while (con.isConnected()) {
try {
int temp;
ByteArrayOutputStream baos = new ByteArrayOutputStream();
while (((temp = con.is.read()) != -1) && (temp != eot)) {
baos.write(temp);
}
lblIncoming.setText(new String(baos.toByteArray()));
Thread.sleep(2000);
} catch (Exception e) {
e.printStackTrace();
}
}
}
});
tIncoming.start();
}
With the getDisconnectButton() method, I do not know how to properly disconnect from the server, as the SocketConnection object does not seem to have an appropriate method for this.

Answer 1

If you call close() on either the Input- or OutputStream then you close the Socket, code from Socket.SocketInputStream class link.
public void close() throws IOException {
closed = true;
if(Util.getImplementation().isSocketConnected(impl)) {
Util.getImplementation().disconnectSocket(impl);
con.setConnected(false);
}
}
So first send close instruction to Server and then close a stream.
Hope this helps,