NetLogoLogTest.java

/**
 * This test was created to test out the new features in NetLogo 4.1 pre 6. Specifically, it
 * was designed to test embedding, controlling and logging of applet-like NetLogo models.
 * 
 * @author sfentress
 *
 */
public class NetLogoLogTest
{
	
	// Sample online nlogo file.
	final String urlModelLocation = "http://udl.concord.org/share/models/netlogo/Daisyworld.nlogo";

	public NetLogoLogTest()
	{
		final JFrame frame = createFrame();

		final InterfaceComponent app = new InterfaceComponent(frame);
		
		Logger globalVariablesLogger = Logger.getLogger("org.nlogo.api.Logger.GLOBALS");
		Logger buttonsLogger = Logger.getLogger("org.nlogo.api.Logger.BUTTONS");
		
		globalVariablesLogger.removeAllAppenders();
		
		globalVariablesLogger.setLevel(Level.INFO);
		
		globalVariablesLogger.addAppender(new EventAppender());
		buttonsLogger.addAppender(new EventAppender());


		EventQueue.invokeLater(new Runnable() {

			public void run()
			{
				try {
					JScrollPane scroll = new JScrollPane(app);
					frame.getContentPane().add(scroll);
					frame.pack();
					String source = getStringFromUrl(new URL(urlModelLocation));
					app.openFromSource("Model", source);
					Reader reader = getLoggerProperties();
					if (reader != null){
						app.startLogging(reader, "user");
					}
					frame.setVisible(true);
				} catch (IOException e) {
					e.printStackTrace();
				} catch (InvalidVersionException e) {
					e.printStackTrace();
				}

			}
		});

	}
	
	public Reader getLoggerProperties(){
		BufferedReader br = null;
		
		URL propertiesFile = this.getClass().getResource("netlogo_logging.xml");
		if (propertiesFile != null){
    		try {
    	        br = new BufferedReader(new InputStreamReader(propertiesFile.openStream()));
            } catch (IOException e) {
    	        e.printStackTrace();
            }
		}
        return br;
	}
	
	public static JFrame createFrame(){
		JFrame frame = new JFrame("NetLogo Logging Test");
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setPreferredSize(new Dimension(700,400));
		return frame;
	}
	
	public String getStringFromUrl(URL url){
		try {
	        InputStream inputStream = url.openStream();
	        ByteArrayOutputStream bout = new ByteArrayOutputStream();
	        byte [] buffer = new byte[1024];
	        int len;
	        while((len = inputStream.read(buffer)) > 0) {
	        	bout.write(buffer, 0, len);
	        }
	        return bout.toString();
        } catch (IOException e) {
	        e.printStackTrace();
        }
        return null;
	}
	
	public static void main(String[] args)
	{
		NetLogoLogTest n = new NetLogoLogTest();
	}
	
	/**
	 * The EventAppender listens for every invocation of doAppend
	 * by the Logger. The LogMessage that comes back can then
	 * be parsed for information about the variable that has
	 * changed and its new value.
	 */
	private class EventAppender extends NullAppender{
		
		public void doAppend(LoggingEvent event){
			LogMessage logMessage = (LogMessage) event.getMessage();
			for (String[] attribute : logMessage.attributes){
				System.out.print("event: "+Arrays.toString(attribute) + ": ");
			}
			
			for (LogMessage element : logMessage.elements){
				System.out.print(element.data + " ; ");
			}
			System.out.println("");
		}
	}

}