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import java.awt.FlowLayout;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.net.URI;

import java.net.URISyntaxException;

import java.nio.channels.NotYetConnectedException;

import java.util.Collections;

import java.util.LinkedList;

import java.util.List;

import java.util.Timer;

import java.util.TimerTask;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.JSlider;

import javax.swing.JTextArea;

import javax.swing.JTextField;

import javax.swing.event.ChangeEvent;

import javax.swing.event.ChangeListener;

import org.java_websocket.WebSocketClient;

public class ServerStressTest extends JFrame {

private JSlider clients;

private JSlider interval;

private JSlider joinrate;

private JButton start, stop, reset;

private JLabel joinratelabel = new JLabel();

private JLabel clientslabel = new JLabel();

private JLabel intervallabel = new JLabel();

private JTextField uriinput = new JTextField( "ws://localhost:8887" );

private JTextArea text = new JTextArea( "payload" );

private Timer timer = new Timer( true );

private Thread adjustthread;

private int notyetconnected = 0;

public ServerStressTest() {

setTitle( "ServerStressTest" );

setDefaultCloseOperation( EXIT_ON_CLOSE );

start = new JButton( "Start" );

start.addActionListener( new ActionListener() {

@Override

public void actionPerformed( ActionEvent e ) {

start.setEnabled( false );

stop.setEnabled( true );

reset.setEnabled( false );

interval.setEnabled( false );

clients.setEnabled( false );

stopAdjust();

adjustthread = new Thread( new Runnable() {

@Override

public void run() {

try {

adjust();

} catch ( InterruptedException e ) {

System.out.println( "adjust chanced" );

}

}

} );

adjustthread.start();

}

} );

stop = new JButton( "Stop" );

stop.setEnabled( false );

stop.addActionListener( new ActionListener() {

@Override

public void actionPerformed( ActionEvent e ) {

timer.cancel();

stopAdjust();

start.setEnabled( true );

stop.setEnabled( false );

reset.setEnabled( true );

joinrate.setEnabled( true );

interval.setEnabled( true );

clients.setEnabled( true );

}

} );

reset = new JButton( "reset" );

reset.setEnabled( true );

reset.addActionListener( new ActionListener() {

@Override

public void actionPerformed( ActionEvent e ) {

while ( !websockets.isEmpty() )

websockets.remove( 0 ).close();

}

} );

joinrate = new JSlider( 0, 5000 );

joinrate.addChangeListener( new ChangeListener() {

@Override

public void stateChanged( ChangeEvent e ) {

joinratelabel.setText( "Joinrate: " + joinrate.getValue() + " ms " );

}

} );

clients = new JSlider( 0, 10000 );

clients.addChangeListener( new ChangeListener() {

@Override

public void stateChanged( ChangeEvent e ) {

clientslabel.setText( "Clients: " + clients.getValue() );

}

} );

interval = new JSlider( 0, 5000 );

interval.addChangeListener( new ChangeListener() {

@Override

public void stateChanged( ChangeEvent e ) {

intervallabel.setText( "Interval: " + interval.getValue() + " ms " );

}

} );

setSize( 300, 400 );

setLayout( new GridLayout( 10, 1, 10, 10 ) );

add( new JLabel( "URI" ) );

add( uriinput );

add( joinratelabel );

add( joinrate );

add( clientslabel );

add( clients );

add( intervallabel );

add( interval );

JPanel south = new JPanel( new FlowLayout( FlowLayout.CENTER ) );

add( text );

add( south );

south.add( start );

south.add( stop );

south.add( reset );

joinrate.setValue( 200 );

interval.setValue( 1000 );

clients.setValue( 1 );

}

List<WebSocketClient> websockets = Collections.synchronizedList( new LinkedList<WebSocketClient>() );

URI uri;

public void adjust() throws InterruptedException {

System.out.println( "Adjust" );

try {

uri = new URI( uriinput.getText() );

} catch ( URISyntaxException e ) {

e.printStackTrace();

}

int totalclients = clients.getValue();

while ( websockets.size() < totalclients ) {

WebSocketClient cl = new ExampleClient( uri ) {

@Override

public void onClose( int code, String reason, boolean remote ) {

System.out.println( "Closed duo " + code + " " + reason );

clients.setValue( websockets.size() );

websockets.remove( this );

}

};

cl.connect();

clients.setValue( websockets.size() );

websockets.add( cl );

Thread.sleep( joinrate.getValue() );

}

while ( websockets.size() > clients.getValue() ) {

websockets.remove( 0 ).close();

}

timer = new Timer( true );

timer.scheduleAtFixedRate( new TimerTask() {

@Override

public void run() {

send();

}

}, 0, interval.getValue() );

}

public void stopAdjust() {

if( adjustthread != null ) {

adjustthread.interrupt();

try {

adjustthread.join();

} catch ( InterruptedException e ) {

e.printStackTrace();

}

}

}

public void send() {

notyetconnected = 0;

String payload = text.getText();

long time1 = System.currentTimeMillis();

synchronized ( websockets ) {

for( WebSocketClient cl : websockets ) {

try {

cl.send( payload );

cl.flush();

} catch ( NotYetConnectedException e ) {

notyetconnected++;

}

}

}

System.out.println( websockets.size() + "/" + notyetconnected + " clients sent \"" + payload + "\"" + ( System.currentTimeMillis() - time1 ) );

}

/**

* @param args

*/

public static void main( String[] args ) {

new ServerStressTest().setVisible( true );

}

}