mil.navy.nps.awt
Class AwtPduViewer

java.lang.Object
  java.awt.Component
      java.awt.Container
          java.awt.Panel
              java.applet.Applet
                  mil.navy.nps.awt.AwtPduViewer

All Implemented Interfaces:

javax.accessibility.Accessible, java.awt.event.ActionListener, java.util.EventListener, java.awt.image.ImageObserver, java.awt.event.ItemListener, java.awt.MenuContainer, java.lang.Runnable, java.io.Serializable

public class AwtPduViewer

extends java.applet.Applet

implements java.lang.Runnable, java.awt.event.ItemListener, java.awt.event.ActionListener

AwtPduViewer is an applet that reads Pdus and displays their values on the screen. It is configured with a socket, which allows the applet to read data from the wire; it uses the package mil.navy.nps.dis, which implements the DIS protocol.

This file was generated by Microsquish J++, which is something of an experiment. We'll see how it works out. It's also my first applet that isn't completely trivial, so be a little gentle.

This is compliant with the JDK 1.02 spec; it makes use of deprecated aspects of that API rather than use JDK 1.1. This is primarily to get it working with Netscape 3.01. 1.1 browser implementations should be compatible, at least for the next release.

Netscape bitches & moans about doing a thread.suspend(), complaining about the possibility of deadlock. Not sure what this is all about, but it seems to work. (Note: JavaSoft has deprecated thread.suspend() and friends in 1.1 because of inherent problems w/ deadlock. This needs to be reworked.

This takes two parameters from the HTML file, "PduSocket" and"MulticastGroup". The first is the socket the applet listens on. The second is a multicast group, a feature that is not implemented right now since Netscape doesn't do multicast.

Testing: sent ESPdus to host (madison) from both madison and pinafore using mil.navy.nps.dis.Benchmark. HISTORY

10Apr97 DMcG New

Version:

1.0

Author:

Don McGregor ( http://www.npsnet.org/~mcgredo)

See Also:

UpdateThread, TextAreaStream, Serialized Form

Nested Class Summary

Nested classes inherited from class java.applet.Applet

java.applet.Applet.AccessibleApplet

Nested classes inherited from class java.awt.Panel

java.awt.Panel.AccessibleAWTPanel

Nested classes inherited from class java.awt.Container

java.awt.Container.AccessibleAWTContainer

Nested classes inherited from class java.awt.Component

java.awt.Component.AccessibleAWTComponent, java.awt.Component.BltBufferStrategy, java.awt.Component.FlipBufferStrategy

Field Summary

Fields inherited from class java.applet.Applet

Fields inherited from class java.awt.Container

Fields inherited from class java.awt.Component

BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT

Fields inherited from interface java.awt.image.ImageObserver

ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH

Constructor Summary

AwtPduViewer()

Method Summary

void	actionPerformed(java.awt.event.ActionEvent e) Handles button presses
void	destroy()
java.lang.String	getAppletInfo()
java.lang.String[][]	getParameterInfo()
void	init() Applet initialization code
void	itemStateChanged(java.awt.event.ItemEvent ie) itemStateChanged is the interface for ItemListener.
void	paint(java.awt.Graphics g)
void	run()
void	start()
void	stop()
void	updateDisplay() Updates the display by querying the BehaviorStreamBufferUDP, returning any Pdus that have arrived since the last time we asked, and updating the display.

Methods inherited from class java.applet.Applet

getAccessibleContext, getAppletContext, getAudioClip, getAudioClip, getCodeBase, getDocumentBase, getImage, getImage, getLocale, getParameter, isActive, newAudioClip, play, play, resize, resize, setStub, showStatus

Methods inherited from class java.awt.Panel

addNotify

Methods inherited from class java.awt.Container

add, add, add, add, add, addContainerListener, addImpl, addPropertyChangeListener, addPropertyChangeListener, applyComponentOrientation, areFocusTraversalKeysSet, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getAlignmentX, getAlignmentY, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getContainerListeners, getFocusTraversalKeys, getFocusTraversalPolicy, getInsets, getLayout, getListeners, getMaximumSize, getMinimumSize, getPreferredSize, insets, invalidate, isAncestorOf, isFocusCycleRoot, isFocusCycleRoot, isFocusTraversalPolicySet, layout, list, list, locate, minimumSize, paintComponents, paramString, preferredSize, print, printComponents, processContainerEvent, processEvent, remove, remove, removeAll, removeContainerListener, removeNotify, setFocusCycleRoot, setFocusTraversalKeys, setFocusTraversalPolicy, setFont, setLayout, transferFocusBackward, transferFocusDownCycle, update, validate, validateTree

Methods inherited from class java.awt.Component

action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, bounds, checkImage, checkImage, coalesceEvents, contains, contains, createImage, createImage, createVolatileImage, createVolatileImage, disable, disableEvents, dispatchEvent, enable, enable, enableEvents, enableInputMethods, firePropertyChange, firePropertyChange, firePropertyChange, getBackground, getBounds, getBounds, getColorModel, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeysEnabled, getFont, getFontMetrics, getForeground, getGraphics, getGraphicsConfiguration, getHeight, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getLocation, getLocation, getLocationOnScreen, getMouseListeners, getMouseMotionListeners, getMouseWheelListeners, getName, getParent, getPeer, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getSize, getToolkit, getTreeLock, getWidth, getX, getY, gotFocus, handleEvent, hasFocus, hide, imageUpdate, inside, isBackgroundSet, isCursorSet, isDisplayable, isDoubleBuffered, isEnabled, isFocusable, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, isOpaque, isShowing, isValid, isVisible, keyDown, keyUp, list, list, list, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, postEvent, prepareImage, prepareImage, printAll, processComponentEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processKeyEvent, processMouseEvent, processMouseMotionEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, repaint, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, reshape, setBackground, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setEnabled, setFocusable, setFocusTraversalKeysEnabled, setForeground, setIgnoreRepaint, setLocale, setLocation, setLocation, setName, setSize, setSize, setVisible, show, show, size, toString, transferFocus, transferFocusUpCycle

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

AwtPduViewer

public AwtPduViewer()

Method Detail

getAppletInfo

public java.lang.String getAppletInfo()

getParameterInfo

public java.lang.String[][] getParameterInfo()

init

public void init()

Applet initialization code

actionPerformed

public void actionPerformed(java.awt.event.ActionEvent e)

Handles button presses

Specified by:

actionPerformed in interface java.awt.event.ActionListener

destroy

public void destroy()

paint

public void paint(java.awt.Graphics g)

start

public void start()

stop

public void stop()

run

public void run()

Specified by:

run in interface java.lang.Runnable

updateDisplay

public void updateDisplay()

Updates the display by querying the BehaviorStreamBufferUDP, returning any Pdus that have arrived since the last time we asked, and updating the display. This is kicked off by its own thread, so it runs asyncronously from the app. the display is updated every X seconds. We need to lock access to pduPool, since this is global data used elsewhere in the applet in another thread. Not sure about the requirement to lock list, the GUI element that displays the scrolling list. This is the only place we do a _write_ to it, so I think it's OK.

itemStateChanged

public void itemStateChanged(java.awt.event.ItemEvent ie)

itemStateChanged is the interface for ItemListener. When this object is added as a listener to an object, such as a awt.List, this gets the event when something is selected. We act on that by dumping out the contents of the selected item.

Specified by:

itemStateChanged in interface java.awt.event.ItemListener