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Copy pathDistributedTextEditor.java
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609 lines (529 loc) · 17.5 KB
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import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.Random;
import javax.swing.*;
import javax.swing.text.*;
public class DistributedTextEditor extends JFrame {
private static final long serialVersionUID = -1412971829037207445L;
private static DistributedTextEditor editor;
private JTextArea area1 = new JTextArea(20,120);
private JTextArea area2 = new JTextArea(20,120);
private JTextField ipaddress = new JTextField("localhost");
private JTextField portNumber = new JTextField("4242");
private EventReplayer er;
private Thread ert;
private JFileChooser dialog =
new JFileChooser(System.getProperty("user.dir"));
private String currentFile = "Untitled";
private boolean changed = false;
private boolean connected = false;
private boolean active = false;
private boolean locked = false;
private boolean listen = false;
private DocumentEventCapturer dec;
private ServerSocket serverSocket;
private Socket clientSocket;
private LamportClock lc;
private int serverport;
public DistributedTextEditor() {
area1.setFont(new Font("Monospaced",Font.PLAIN,12));
area2.setFont(new Font("Monospaced",Font.PLAIN,12));
((AbstractDocument)area1.getDocument()).setDocumentFilter(dec);
area2.setEditable(false);
Container content = getContentPane();
content.setLayout(new BoxLayout(content, BoxLayout.Y_AXIS));
JScrollPane scroll1 =
new JScrollPane(area1,
JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
content.add(scroll1,BorderLayout.CENTER);
JScrollPane scroll2 =
new JScrollPane(area2,
JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
content.add(scroll2,BorderLayout.CENTER);
content.add(ipaddress,BorderLayout.CENTER);
content.add(portNumber,BorderLayout.CENTER);
JMenuBar JMB = new JMenuBar();
setJMenuBar(JMB);
JMenu file = new JMenu("File");
JMenu edit = new JMenu("Edit");
JMB.add(file);
JMB.add(edit);
file.add(Listen);
file.add(Connect);
file.add(Disconnect);
file.addSeparator();
file.add(Save);
file.add(SaveAs);
file.add(Quit);
edit.add(Copy);
edit.add(Paste);
edit.getItem(0).setText("Copy");
edit.getItem(1).setText("Paste");
Save.setEnabled(false);
SaveAs.setEnabled(false);
Disconnect.setEnabled(false);
setDefaultCloseOperation(EXIT_ON_CLOSE);
pack();
area1.addKeyListener(k1);
area1.addMouseListener(m1);
setTitle("Disconnected");
setVisible(true);
area1.insert("Welcome to Hjortehandlerne's distributed text editor. \n", 0);
this.addWindowListener(w1);
}
private WindowListener w1 = new WindowListener() {
/**
* Kill all active threads
*/
@Override
public void windowClosing(WindowEvent e) {
disconnect();
}
@Override
public void windowActivated(WindowEvent e) {}
@Override
public void windowClosed(WindowEvent e) {}
@Override
public void windowDeactivated(WindowEvent e) {}
@Override
public void windowDeiconified(WindowEvent e) {}
@Override
public void windowIconified(WindowEvent e) {}
@Override
public void windowOpened(WindowEvent e) {}
};
private KeyListener k1 = new KeyAdapter() {
public void keyPressed(KeyEvent e) {
changed = true;
Save.setEnabled(true);
SaveAs.setEnabled(true);
}
/**
* 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();
}
}
};
/**
* This mouselistener ensures that both peers have an updated caret-position for this user, when he moves his caret by a mouseclick.
*/
private MouseListener m1 = new MouseAdapter() {
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();
}
}
};
/**
* This action is called when the Listen-button is fired.
* It creates a serversocket, and awaits a connection.
* When the first connection is made, a ConnectionData object is sent to the other peer, and this editor creates new data for the incomming peer.
* After the first connection is made, waitForConnection is called, which waits for more connections.
*/
Action Listen = new AbstractAction("Listen") {
public void actionPerformed(ActionEvent e) {
saveOld();
final InetAddress local;
active = true;
try {
local = InetAddress.getLocalHost();
Runnable server = new Runnable() {
public void run() {
serverport = Integer.parseInt(portNumber.getText());
int myID = getNewId();
registerOnPort();
editor.setTitleToListen();
clientSocket = waitForConnectionFromClient();
lc = new LamportClock(myID);
area1.setText("");
resetArea2();
if (clientSocket != null) {
listen = true;
connected = true;
dec = new DocumentEventCapturer(lc, editor);
setDocumentFilter(dec);
er = new EventReplayer(editor, dec, lc);
er.updateCaretPos(myID, 0);
ert = new Thread(er);
ert.start();
try {
ObjectOutputStream output = new ObjectOutputStream(clientSocket.getOutputStream());
ObjectInputStream input = new ObjectInputStream(clientSocket.getInputStream());
JoinNetworkRequest request = (JoinNetworkRequest) input.readObject();
int id = getNewId();
Peer peer = new Peer(editor, er, id, clientSocket, output, input, lc, clientSocket.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());
dec.addPeer(peer);
er.addCaretPos(id, 0);
Thread t = new Thread(peer);
t.start();
peer.writeObjectToStream(cd);
} catch (IOException | ClassNotFoundException e) {
e.printStackTrace();
}
}
waitForConnection();
}
};
Thread serverThread = new Thread(server);
serverThread.start();
} catch (UnknownHostException e1) {
e1.printStackTrace();
}
changed = false;
Disconnect.setEnabled(true);
Listen.setEnabled(false);
Connect.setEnabled(false);
Save.setEnabled(false);
SaveAs.setEnabled(false);
}
};
/**
* 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.
*
* 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();
}
}
}
}
private void waitForAllToLock() {
for(Peer p : dec.getPeers()) {
while(!p.isLocked() && p.isConnected()) {
try {
Thread.sleep(100);
} catch (InterruptedException e) {
}
}
p.setLocked(false);
}
}
/**
*
* Will register this server on the port number portNumber. Will not start waiting
* for connections. For this you should call waitForConnectionFromClient().
*/
private void registerOnPort() {
try {
serverSocket = new ServerSocket(Integer.parseInt(portNumber.getText()));
} catch (IOException e) {
serverSocket = null;
System.err.println("Cannot open server socket on port number" + portNumber.getText());
System.err.println(e);
System.exit(-1);
}
}
/**
* Closes the serversocket
*/
public void deregisterOnPort() {
if (serverSocket != null) {
try {
serverSocket.close();
serverSocket = null;
} catch (IOException e) {
System.err.println(e);
}
}
}
/**
*
* Waits for the next client to connect on port number portNumber or takes the
* next one in line in case a client is already trying to connect. Returns the
* socket of the connection, null if there were any failures.
*/
private Socket waitForConnectionFromClient() {
Socket res = null;
try {
res = serverSocket.accept();
} catch (IOException e) {
}
return res;
}
/**
* This action is called when the Connect-button is fired.
* It creates a ClientSocket with the known peer, and opens a serversocket to listen for new peers.
* We send a JoinNetworkRequest to the known peer, and receive ConnectionData from him. We then connect to all other peers in the network,
* and update our data from the received ConnectionData.
* At last we call waitForConnection() to wait for new connections from new peers, and finally we tell everyone to unlock the system
*/
Action Connect = new AbstractAction("Connect") {
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");
}
}
private Socket connectToPeer(String ip, int port) {
try {
Socket peer = new Socket(ip, port);
return peer;
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
private ConnectionData getConnectionData(Socket clientSocket, ObjectInputStream input) {
ConnectionData res;
try {
Object o = input.readObject();
res = (ConnectionData) o;
return res;
} catch (IOException | ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
};
/**
* This action is called when the Disconnect-button is fired.
*/
Action Disconnect = new AbstractAction("Disconnect") {
public void actionPerformed(ActionEvent e) {
disconnect();
}
};
/**
* The disconnect method will stop the eventreplayer, and send null to the other peers, to stop their reading from their streams.
* The GUI-menu is updated appropriately.
*/
public void disconnect() {
setTitle("Disconnected");
active = false;
if(connected == true) {
er.stopStreamToQueue();
ert.interrupt();
setDocumentFilter(null);
connected = false;
setLocked(false);
}
deregisterOnPort();
Disconnect.setEnabled(false);
Connect.setEnabled(true);
Listen.setEnabled(true);
Save.setEnabled(true);
SaveAs.setEnabled(true);
}
Action Save = new AbstractAction("Save") {
public void actionPerformed(ActionEvent e) {
if(!currentFile.equals("Untitled"))
saveFile(currentFile);
else
saveFileAs();
}
};
Action SaveAs = new AbstractAction("Save as...") {
public void actionPerformed(ActionEvent e) {
saveFileAs();
}
};
Action Quit = new AbstractAction("Quit") {
public void actionPerformed(ActionEvent e) {
saveOld();
System.exit(0);
}
};
ActionMap m = area1.getActionMap();
Action Copy = m.get(DefaultEditorKit.copyAction);
Action Paste = m.get(DefaultEditorKit.pasteAction);
private void saveFileAs() {
if(dialog.showSaveDialog(null)==JFileChooser.APPROVE_OPTION)
saveFile(dialog.getSelectedFile().getAbsolutePath());
}
private void saveOld() {
if(changed) {
if(JOptionPane.showConfirmDialog(this, "Would you like to save "+ currentFile +" ?","Save",JOptionPane.YES_NO_OPTION)== JOptionPane.YES_OPTION)
saveFile(currentFile);
}
}
private void saveFile(String fileName) {
try {
FileWriter w = new FileWriter(fileName);
area1.write(w);
w.close();
currentFile = fileName;
changed = false;
Save.setEnabled(false);
}
catch(IOException e) {
}
}
public boolean getActive() {
return active;
}
public DocumentFilter getDocumentFilter() {
return dec;
}
public JTextArea getTextArea() {
return area1;
}
public DocumentEventCapturer getDocumentEventCapturer() {
return dec;
}
public void setDocumentFilter(DocumentFilter filter) {
((AbstractDocument)area1.getDocument()).setDocumentFilter(filter);
}
public void setErrorMessage(String s) {
area2.setText("Error: " + s);
}
public void setTitleToListen() {
try {
String serverString = serverSocket.getInetAddress().getLocalHost().toString();
String serverIP = serverString.split("/")[1];
editor.setTitle("Listening on: " + serverIP + ":" + serverport);
} catch (UnknownHostException e) {
e.printStackTrace();
}
}
public void resetArea2() {
area2.setText("");
}
public static void main(String[] arg) {
editor = new DistributedTextEditor();
}
public void setLocked(boolean b) {
locked = b;
area1.setEnabled(!b);
}
public boolean getListen() {
return listen;
}
public void setTextInArea2(String res) {
area2.setText(res);
}
public EventReplayer getEventReplayer() {
return er;
}
public int getNewId() {
Random r = new Random();
return r.nextInt(1000000);
}
}
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