com.ibm.etools.mft.samples.scribble.ScribbleSubscriber.java Source code

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Here is the source code for com.ibm.etools.mft.samples.scribble.ScribbleSubscriber.java

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/*
Sample program for use with IBM Integration Bus
 Copyright International Business Machines Corporation 2013
Licensed Materials - Property of IBM
*/

package com.ibm.etools.mft.samples.scribble;

import java.io.ByteArrayInputStream;
import java.io.IOException;

import javax.jms.*;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.eclipse.jface.action.*;
import org.eclipse.jface.resource.*;
import org.eclipse.jface.window.*;
import org.eclipse.swt.*;
import org.eclipse.swt.events.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
import org.w3c.dom.Document;
import org.xml.sax.SAXException;

/**
 * @author cmarkes
 *
 * To change this generated comment edit the template variable "typecomment":
 * Window>Preferences>Java>Templates.
 * To enable and disable the creation of type comments go to
 * Window>Preferences>Java>Code Generation.
 */

public class ScribbleSubscriber extends AbstractScribbleApplication {
    public static final String copyright = "Licensed Material - Property of IBM 5724-E11, 5724-E26 (c)Copyright IBM Corp. 2002, 2008 - All Rights Reserved. US Government Users Restricted Rights - Use,duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp."; //$NON-NLS-1$
    final static String TOPIC_ROOT = ScribblePublisher.TOPIC_ROOT, TOPIC_DRAW = ScribblePublisher.TOPIC_DRAW,
            TOPIC_CLEAR = ScribblePublisher.TOPIC_CLEAR;

    Shell shell;
    ScribbleCanvas canvas;
    TopicConnection connection;
    Action connectAction;

    public static void main(String[] args) {
        ScribbleSubscriber app = new ScribbleSubscriber(null);

        app.open();

        Shell shell = app.getShell();
        Display display = Display.getDefault();

        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }

        display.dispose();
    }

    public ScribbleSubscriber(Shell shell) {
        super(shell);

        getToolBarManager().add(connectAction = new Action(getString("action.connect"),
                ImageDescriptor.createFromFile(getClass(), "broker_obj.gif")) {
            public void run() {
                connect(null);
            }
        });
    }

    protected void configureShell(Shell shell) {
        this.shell = shell;

        GridData data;
        Control toolbar, statusLine;
        int numColumns;

        shell.setLayout(new GridLayout(numColumns = 2, false));

        toolbar = getToolBarManager().createControl(shell);
        toolbar.setLayoutData(data = new GridData(GridData.HORIZONTAL_ALIGN_FILL | GridData.VERTICAL_ALIGN_CENTER));
        data.horizontalSpan = numColumns;

        canvas = new ScribbleCanvas(shell, SWT.NONE);
        canvas.setLayoutData(data = new GridData(GridData.FILL_BOTH));
        data.horizontalSpan = 2;
        canvas.setBackground(shell.getDisplay().getSystemColor(SWT.COLOR_WHITE));
        canvas.setForeground(shell.getDisplay().getSystemColor(SWT.COLOR_DARK_BLUE));
        canvas.setEnabled(false);

        statusLine = getStatusLineManager().createControl(shell);
        statusLine.setLayoutData(
                data = new GridData(GridData.HORIZONTAL_ALIGN_FILL | GridData.VERTICAL_ALIGN_CENTER));
        data.horizontalSpan = numColumns;

        shell.setText(getString("title.subscriber"));
        shell.addDisposeListener(new DisposeListener() {
            public void widgetDisposed(DisposeEvent event) {
                disconnect();
            }
        });
        shell.pack();

        setStatus(getString("status.unconnected"));
    }

    public int open() {
        int rc = super.open();

        ScribbleConnectionInfo info = ScribbleConnectionDialog.getDefaultConnectionInfo();

        if (info != null) {
            connect(info);
        }

        return rc;
    }

    public void connect(ScribbleConnectionInfo info) {
        ScribbleConnectionDialog dialog = new ScribbleConnectionDialog(shell, this, info);

        if (dialog.open() == Window.OK) {
            setStatus(getString("status.connected") + dialog.getConnectionInfo());
        } else {
            setStatus(getString("status.unconnected"));
        }
    }

    public void init(TopicConnection connection) throws JMSException {
        TopicSession session = connection.createTopicSession(false, Session.AUTO_ACKNOWLEDGE);
        TopicSubscriber drawSubscriber = session.createSubscriber(session.createTopic(TOPIC_DRAW)),
                clearSubscriber = session.createSubscriber(session.createTopic(TOPIC_CLEAR));

        drawSubscriber.setMessageListener(new MessageListener() {
            public void onMessage(Message message) {
                draw(message);
            }
        });

        clearSubscriber.setMessageListener(new MessageListener() {
            public void onMessage(Message message) {
                clear(message);
            }
        });

        synchronized (this) {
            this.connection = connection;
        }
    }

    public synchronized void disconnect() {
        if (connection != null) {
            new DisconnectOperation(connection).start();

            this.connection = null;
        }
    }

    void draw(Message message) {
        final TextMessage m = (TextMessage) message;

        shell.getDisplay().syncExec(new Runnable() {
            public void run() {
                try {
                    byte[] bytes = m.getText().getBytes("UTF-8");
                    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
                    DocumentBuilder builder = factory.newDocumentBuilder();
                    Document doc = builder.parse(new ByteArrayInputStream(bytes));
                    String x1 = doc.getElementsByTagName("x1").item(0).getFirstChild().getNodeValue();
                    String x2 = doc.getElementsByTagName("x2").item(0).getFirstChild().getNodeValue();
                    String y1 = doc.getElementsByTagName("y1").item(0).getFirstChild().getNodeValue();
                    String y2 = doc.getElementsByTagName("y2").item(0).getFirstChild().getNodeValue();
                    canvas.draw(Integer.parseInt(x1), Integer.parseInt(y1), Integer.parseInt(x2),
                            Integer.parseInt(y2));
                } catch (JMSException jmse) {
                    setStatus(jmse.getMessage());
                } catch (ParserConfigurationException e) {

                } catch (SAXException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        });
    }

    void clear(Message message) {
        shell.getDisplay().syncExec(new Runnable() {
            public void run() {
                canvas.clear();
            }
        });
    }
}