/**
         * The keyReleased event ensures that the caret-position is updated for both peers, when the
         * user moves the caret with the arrow-keys.
         */
        public void keyReleased(KeyEvent e) {
          int left = e.VK_LEFT;
          int right = e.VK_RIGHT;
          int up = e.VK_UP;
          int down = e.VK_DOWN;
          int home = e.VK_HOME;
          int end = e.VK_END;
          int A = e.VK_A;
          int kc = e.getKeyCode();

          if (kc == left
              || kc == right
              || kc == up
              || kc == down
              || kc == home
              || kc == end
              || (kc == A && e.isControlDown())) {
            if (dec == null) return;
            lc.increment();
            TextEvent cu = new CaretUpdate(area1.getCaretPosition(), lc.getTimeStamp());
            dec.sendObjectToAllPeers(cu);
            er.getEventHistoryLock().lock();
            er.getEventHistory().add(cu);
            er.getEventHistoryLock().unlock();
          }
        }
 private void waitForAllToLock() {
   for (Peer p : dec.getPeers()) {
     while (!p.isLocked() && p.isConnected()) {
       try {
         Thread.sleep(100);
       } catch (InterruptedException e) {
       }
     }
     p.setLocked(false);
   }
 }
 public void mouseReleased(MouseEvent e) {
   if (e.getButton() == e.BUTTON1 && connected) {
     if (dec == null) return;
     lc.increment();
     TextEvent cu = new CaretUpdate(area1.getCaretPosition(), lc.getTimeStamp());
     dec.sendObjectToAllPeers(cu);
     er.getEventHistoryLock().lock();
     er.getEventHistory().add(cu);
     er.getEventHistoryLock().unlock();
   }
 }
        public void actionPerformed(ActionEvent e) {
          saveOld();
          area1.setText("");
          resetArea2();
          try {
            clientSocket = new Socket(ipaddress.getText(), Integer.parseInt(portNumber.getText()));
            Random r = new Random();
            serverport = 10000 + r.nextInt(8999); // random port :D

            serverSocket = new ServerSocket(serverport);
            active = true;
            editor.setTitleToListen();

            connected = true;

            ObjectOutputStream output = new ObjectOutputStream(clientSocket.getOutputStream());
            ObjectInputStream input = new ObjectInputStream(clientSocket.getInputStream());
            output.writeObject(new JoinNetworkRequest(serverport));

            ConnectionData data = getConnectionData(clientSocket, input);

            lc = new LamportClock(data.getId());
            lc.setMaxTime(data.getTs());
            dec = new DocumentEventCapturer(lc, editor);
            er = new EventReplayer(editor, dec, lc);
            ert = new Thread(er);
            ert.start();

            Peer peer =
                new Peer(
                    editor,
                    er,
                    data.getHostId(),
                    clientSocket,
                    output,
                    input,
                    lc,
                    clientSocket.getInetAddress().getHostAddress(),
                    data.getPort());
            dec.addPeer(peer);
            Thread thread = new Thread(peer);
            thread.start();

            er.setAcknowledgements(data.getAcknowledgements());
            er.setEventHistory(data.getEventHistory());
            er.setCarets(data.getCarets());

            er.addCaretPos(lc.getID(), 0);

            for (PeerWrapper p : data.getPeers()) {
              Socket socket;
              try {
                socket = connectToPeer(p.getIP(), p.getPort());
                ObjectOutputStream outputStream = new ObjectOutputStream(socket.getOutputStream());
                ObjectInputStream inputStream = new ObjectInputStream(socket.getInputStream());
                outputStream.writeObject(
                    new NewPeerDataRequest(lc.getID(), serverSocket.getLocalPort(), 0));
                Peer newPeer =
                    new Peer(
                        editor,
                        er,
                        p.getId(),
                        socket,
                        outputStream,
                        inputStream,
                        lc,
                        p.getIP(),
                        p.getPort());
                dec.addPeer(newPeer);
                Thread t = new Thread(newPeer);
                t.start();
              } catch (IOException ex) {
                continue;
              }
            }

            Thread t1 =
                new Thread(
                    new Runnable() {

                      @Override
                      public void run() {
                        waitForConnection();
                      }
                    });
            t1.start();
            area1.setText(data.getTextField());
            area1.setCaretPosition(0);
            setDocumentFilter(dec);

            dec.sendObjectToAllPeers(new UnlockRequest(lc.getTimeStamp()));

            changed = false;
            Connect.setEnabled(false);
            Disconnect.setEnabled(true);
            Listen.setEnabled(false);
            Save.setEnabled(false);
            SaveAs.setEnabled(false);
          } catch (NumberFormatException | IOException e1) {
            setTitle("Unable to connect");
          }
        }
  /**
   * waitForConnection waits for incomming connections. There are two cases. If we receive a
   * JoinNetworkRequest it means that a new peer tries to get into the network. We lock the entire
   * system, and sends a ConnectionData object to the new peer, from which he can connect to every
   * other peer. We add this new peer to our data.
   *
   * <p>If we receive a NewPeerDataRequest, it means that a new peer has received ConnectionData
   * from another peer in the network, and he is now trying to connect to everyone, including me. We
   * then update our data with the new peer.
   */
  private void waitForConnection() {
    while (active) {
      Socket client = waitForConnectionFromClient();
      if (client != null) {
        try {
          ObjectOutputStream output = new ObjectOutputStream(client.getOutputStream());
          ObjectInputStream input = new ObjectInputStream(client.getInputStream());
          Object o = input.readObject();

          if (o instanceof JoinNetworkRequest) {
            JoinNetworkRequest request = (JoinNetworkRequest) o;
            dec.sendObjectToAllPeers(new LockRequest(lc.getTimeStamp()));
            waitForAllToLock();
            setLocked(true);
            Thread.sleep(500);
            int id = getNewId();
            Peer p =
                new Peer(
                    editor,
                    er,
                    id,
                    client,
                    output,
                    input,
                    lc,
                    client.getInetAddress().getHostAddress(),
                    request.getPort());
            ConnectionData cd =
                new ConnectionData(
                    er.getEventHistory(),
                    er.getAcknowledgements(),
                    er.getCarets(),
                    id,
                    area1.getText(),
                    lc.getTimeStamp(),
                    lc.getID(),
                    dec.getPeers(),
                    serverSocket.getLocalPort());
            p.writeObjectToStream(cd);
            dec.addPeer(p);
            Thread t = new Thread(p);
            t.start();
            er.addCaretPos(id, 0);
          } else if (o instanceof NewPeerDataRequest) {
            NewPeerDataRequest request = (NewPeerDataRequest) o;
            Peer newPeer =
                new Peer(
                    editor,
                    er,
                    request.getId(),
                    client,
                    output,
                    input,
                    lc,
                    client.getInetAddress().getHostAddress(),
                    request.getPort());
            dec.addPeer(newPeer);
            er.addCaretPos(request.getId(), request.getCaretPos());
            newPeer.writeObjectToStream(new NewPeerDataAcknowledgement(lc.getTimeStamp()));
            Thread t = new Thread(newPeer);
            t.start();
          }
        } catch (IOException | ClassNotFoundException | InterruptedException e) {
          e.printStackTrace();
        }
      }
    }
  }