Package gnu.cajo.invoke
Class JClient
java.lang.Object
java.awt.Component
java.awt.Container
java.awt.Panel
java.applet.Applet
javax.swing.JApplet
gnu.cajo.invoke.JClient
- All Implemented Interfaces:
ImageObserver
,MenuContainer
,Serializable
,Accessible
,RootPaneContainer
This class is used to create a hosting VM to receive a Swing graphical proxy
JComponent or and AWT Component, from a remote VM. The client will
require one outbound port, on which to commuinicate with its proxy server
and one on inbound, on which to receive asynchronous callbacks from the
server, if required. It will also use one short-term inbound port on which
to receive the proxy class files. If the client is behind a firewall, these
will have to be open.
Note: to use this Client, instead of the default one, requires use of the new three argument CodebaseServer
Note: to use this Client, instead of the default one, requires use of the new three argument CodebaseServer
constructor
. In this case, he third argument would need to be:
"gnu.cajo.invoke.JClient".- Version:
- 1.0, 20-Feb-06 Initial release
- See Also:
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Nested Class Summary
Nested classes/interfaces inherited from class javax.swing.JApplet
JApplet.AccessibleJApplet
Nested classes/interfaces inherited from class java.applet.Applet
Applet.AccessibleApplet
Nested classes/interfaces inherited from class java.awt.Panel
Panel.AccessibleAWTPanel
Nested classes/interfaces inherited from class java.awt.Container
Container.AccessibleAWTContainer
Nested classes/interfaces inherited from class java.awt.Component
Component.AccessibleAWTComponent, Component.BaselineResizeBehavior, Component.BltBufferStrategy, Component.FlipBufferStrategy
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Field Summary
FieldsFields inherited from class javax.swing.JApplet
accessibleContext, rootPane, rootPaneCheckingEnabled
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
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionvoid
destroy()
This method is called from the AppleContext, when the JApplet is being disposed.This method provides the standard mechanism to identify this JApplet.String[][]
This method describes the optional client parameters.void
init()
This method connects back to its hosting server and requests the item from the server's rmiregistry.static void
The application creates a graphical Component proxy hosting VM.void
start()
This method is called from the AppleContext, each time the JApplet becomes visible.void
stop()
This method is called from the AppleContext, each time the JApplet becomes invisible.Methods inherited from class javax.swing.JApplet
addImpl, createRootPane, getAccessibleContext, getContentPane, getGlassPane, getGraphics, getJMenuBar, getLayeredPane, getRootPane, getTransferHandler, isRootPaneCheckingEnabled, paramString, remove, repaint, setContentPane, setGlassPane, setJMenuBar, setLayeredPane, setLayout, setRootPane, setRootPaneCheckingEnabled, setTransferHandler, update
Methods inherited from class java.applet.Applet
getAppletContext, getAudioClip, getAudioClip, getCodeBase, getDocumentBase, getImage, getImage, getLocale, getParameter, isActive, isValidateRoot, newAudioClip, play, play, resize, resize, setStub, showStatus
Methods inherited from class java.awt.Container
add, add, add, add, add, addContainerListener, addPropertyChangeListener, addPropertyChangeListener, applyComponentOrientation, areFocusTraversalKeysSet, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getAlignmentX, getAlignmentY, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getComponentZOrder, getContainerListeners, getFocusTraversalKeys, getFocusTraversalPolicy, getInsets, getLayout, getListeners, getMaximumSize, getMinimumSize, getMousePosition, getPreferredSize, insets, invalidate, isAncestorOf, isFocusCycleRoot, isFocusCycleRoot, isFocusTraversalPolicyProvider, isFocusTraversalPolicySet, layout, list, list, locate, minimumSize, paint, paintComponents, preferredSize, print, printComponents, processContainerEvent, processEvent, remove, removeAll, removeContainerListener, removeNotify, setComponentZOrder, setFocusCycleRoot, setFocusTraversalKeys, setFocusTraversalPolicy, setFocusTraversalPolicyProvider, setFont, transferFocusDownCycle, 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, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, getBackground, getBaseline, getBaselineResizeBehavior, getBounds, getBounds, getColorModel, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeysEnabled, getFont, getFontMetrics, getForeground, getGraphicsConfiguration, getHeight, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getLocation, getLocation, getLocationOnScreen, getMouseListeners, getMouseMotionListeners, getMousePosition, getMouseWheelListeners, getName, getParent, 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, isMaximumSizeSet, isMinimumSizeSet, isOpaque, isPreferredSizeSet, 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, requestFocus, requestFocus, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, requestFocusInWindow, reshape, revalidate, setBackground, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setEnabled, setFocusable, setFocusTraversalKeysEnabled, setForeground, setIgnoreRepaint, setLocale, setLocation, setLocation, setMaximumSize, setMinimumSize, setMixingCutoutShape, setName, setPreferredSize, setSize, setSize, setVisible, show, show, size, toString, transferFocus, transferFocusBackward, transferFocusUpCycle
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Field Details
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serialVersionUID
private static final long serialVersionUID- See Also:
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proxy
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Constructor Details
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JClient
public JClient()The default constructor does nothing. Initialization is done when the JApplet is loaded into the browser.
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Method Details
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getAppletInfo
This method provides the standard mechanism to identify this JApplet.- Overrides:
getAppletInfo
in classApplet
- Returns:
- The identification string for this JApplet.
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getParameterInfo
This method describes the optional client parameters. There are five such parameters which can be specified:- The
proxyName
parameter is the name of the proxy server item registered in the server's rmiregistry. Unspecified it will be "main". - The
proxyPort
parameter is the outbound port number on which to contact the proxy server. Unspecified it will be 1099. If the client is operating behind a firewall, the must be a permitted outbound port. - The
clientHost
parameter is the external domain name or IP address the server must use to callback its proxy. It may need to be specified if the client is operating behind a NAT router. Unspecified it will be the client's default host address. - The
clientPort
parameter is the external inbound port number on which the server can contact its proxy. It may need to be specified if the client is behind NAT, to map to the correct local port. If a firewall is being used, it must be a permitted inbound port. Unspecified, it will be the same as the local port value below. - The
localPort
parameter is the internal inbound port number on which the server can contact its proxy. It may need to be specified if the client is behind NAT, to map to the correct remote port. Unspecified, it will be anonymous.
- Overrides:
getParameterInfo
in classApplet
- Returns:
- The parameter / information array.
- The
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init
public void init()This method connects back to its hosting server and requests the item from the server's rmiregistry. Next it will invoke a getProxy(null) on the remote reference to request its proxy item. If the item returns the proxy in a MarshalledObject, it will be extracted automatically. If the returned object is a proxy, the client will invoke its init method, passing it a remote reference itself, and to obtain its primary graphical Component representation, which will then be added into the JApplet via the Swing event dispatch thread. The proxy can pass this remote reference back to its hosting item, or to other remote items, on which they can asynchronously call it back. -
start
public void start()This method is called from the AppleContext, each time the JApplet becomes visible. It will attempt to invoke a no-arg start method on the proxy, in the event that it supports one. Support of the method by the proxy is optional. -
stop
public void stop()This method is called from the AppleContext, each time the JApplet becomes invisible. It will attempt to invoke a no-arg stot method on the proxy, in the event that it supports one. Support of the method by the proxy is optional. -
destroy
public void destroy()This method is called from the AppleContext, when the JApplet is being disposed. It will attempt to invoke a no-arg destroy method on the proxy, in the event that it supports one. Support of the method by the proxy is optional. -
main
The application creates a graphical Component proxy hosting VM. With the URL argument provided, it will use the staticgetItem
method of theRemote
class to contact the server. It will then invoke a null-argument getProxy on the resulting reference to request the primary proxy object of the item.
When using the JClient from the command line, it is possible to set the JClient frame title explicitly. To do this, simply type:
java -cp cajo.jar -Dgnu.cajo.invoke.JClient.title="My Frame Title" gnu.cajo.invoke.JClient //myHost:1198/test
Note: When running as an application (except via WebStart) it will load a NoSecurityManager, therefore, if no external SecurityManager is specified in the startup command line; the arriving proxies will have full permissions on this machine!
To restrict client proxies permissions, use a startup invocation similar to the following:
java -cp cajo.jar -Djava.security.manager -Djava.security.policy=client.policy ... gnu.cajo.invoke.JClient ...
See the project client documentation, for more details.
The startup requires one mandatory, and up to four optional configuration parameters, in this order:- args[0] - The URL where to get the graphical proxy item:
file:// http:// ftp:// ..., //host:port/name (rmiregistry), /path/name (serialized), or path/name (class). - args[1] - The optional external client port number, if using NAT.
- args[2] - The optional external client host name, if using NAT.
- args[3] - The optional internal client port number, if using NAT.
- args[4] - The optional internal client host name, if multi home/NIC.
- Throws:
Exception
- args[0] - The URL where to get the graphical proxy item:
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