public void appletStateChanged(AppletEvent evt) {
AppletPanel src = (AppletPanel) evt.getSource();
switch (evt.getID()) {
case AppletPanel.APPLET_RESIZE:
{
if (src != null) {
resize(preferredSize());
validate();
}
break;
}
case AppletPanel.APPLET_LOADING_COMPLETED:
{
Applet a = src.getApplet(); // j86.sun.applet.AppletPanel
// Fixed #4754451: Applet can have methods running on main
// thread event queue.
//
// The cause of this bug is that the frame of the applet
// is created in main thread group. Thus, when certain
// AWT/Swing events are generated, the events will be
// dispatched through the wrong event dispatch thread.
//
// To fix this, we rearrange the AppContext with the frame,
// so the proper event queue will be looked up.
//
// Swing also maintains a Frame list for the AppContext,
// so we will have to rearrange it as well.
//
if (a != null)
AppletPanel.changeFrameAppContext(frame, SunToolkit.targetToAppContext(a));
else AppletPanel.changeFrameAppContext(frame, AppContext.getAppContext());
break;
}
}
}
/**
* Execute applet events. Here is the state transition diagram
*
* <pre>{@literal
* Note: (XXX) is the action
* APPLET_XXX is the state
* (applet code loaded) --> APPLET_LOAD -- (applet init called)--> APPLET_INIT --
* (applet start called) --> APPLET_START -- (applet stop called) --> APPLET_STOP --
* (applet destroyed called) --> APPLET_DESTROY --> (applet gets disposed) -->
* APPLET_DISPOSE --> ...
* }</pre>
*
* In the legacy lifecycle model. The applet gets loaded, inited and started. So it stays in the
* APPLET_START state unless the applet goes away(refresh page or leave the page). So the applet
* stop method called and the applet enters APPLET_STOP state. Then if the applet is revisited, it
* will call applet start method and enter the APPLET_START state and stay there.
*
* <p>In the modern lifecycle model. When the applet first time visited, it is same as legacy
* lifecycle model. However, when the applet page goes away. It calls applet stop method and
* enters APPLET_STOP state and then applet destroyed method gets called and enters APPLET_DESTROY
* state.
*
* <p>This code is also called by AppletViewer. In AppletViewer "Restart" menu, the applet is jump
* from APPLET_STOP to APPLET_DESTROY and to APPLET_INIT .
*
* <p>Also, the applet can jump from APPLET_INIT state to APPLET_DESTROY (in Netscape/Mozilla
* case). Same as APPLET_LOAD to APPLET_DISPOSE since all of this are triggered by browser.
*/
@Override
public void run() {
Thread curThread = Thread.currentThread();
if (curThread == loaderThread) {
// if we are in the loader thread, cause
// loading to occur. We may exit this with
// status being APPLET_DISPOSE, APPLET_ERROR,
// or APPLET_LOAD
runLoader();
return;
}
boolean disposed = false;
while (!disposed && !curThread.isInterrupted()) {
AppletEvent evt;
try {
evt = getNextEvent();
} catch (InterruptedException e) {
showAppletStatus("bail");
return;
}
// showAppletStatus("EVENT = " + evt.getID());
try {
switch (evt.getID()) {
case APPLET_LOAD:
if (!okToLoad()) {
break;
}
// This complexity allows loading of applets to be
// interruptable. The actual thread loading runs
// in a separate thread, so it can be interrupted
// without harming the applet thread.
// So that we don't have to worry about
// concurrency issues, the main applet thread waits
// until the loader thread terminates.
// (one way or another).
if (loaderThread == null) {
setLoaderThread(new Thread(null, this, "AppletLoader", 0, false));
loaderThread.start();
// we get to go to sleep while this runs
loaderThread.join();
setLoaderThread(null);
} else {
// REMIND: issue an error -- this case should never
// occur.
}
break;
case APPLET_INIT:
// AppletViewer "Restart" will jump from destroy method to
// init, that is why we need to check status w/ APPLET_DESTROY
if (status != APPLET_LOAD && status != APPLET_DESTROY) {
showAppletStatus("notloaded");
break;
}
applet.resize(defaultAppletSize);
if (PerformanceLogger.loggingEnabled()) {
PerformanceLogger.setTime("Applet Init");
PerformanceLogger.outputLog();
}
applet.init();
// Need the default(fallback) font to be created in this AppContext
Font f = getFont();
if (f == null
|| "dialog".equals(f.getFamily().toLowerCase(Locale.ENGLISH))
&& f.getSize() == 12
&& f.getStyle() == Font.PLAIN) {
setFont(new Font(Font.DIALOG, Font.PLAIN, 12));
}
// Validate the applet in event dispatch thread
// to avoid deadlock.
try {
final AppletPanel p = this;
Runnable r =
new Runnable() {
@Override
public void run() {
p.validate();
}
};
AWTAccessor.getEventQueueAccessor().invokeAndWait(applet, r);
} catch (InterruptedException ie) {
} catch (InvocationTargetException ite) {
}
status = APPLET_INIT;
showAppletStatus("inited");
break;
case APPLET_START:
{
if (status != APPLET_INIT && status != APPLET_STOP) {
showAppletStatus("notinited");
break;
}
applet.resize(currentAppletSize);
applet.start();
// Validate and show the applet in event dispatch thread
// to avoid deadlock.
try {
final AppletPanel p = this;
final Applet a = applet;
Runnable r =
new Runnable() {
@Override
public void run() {
p.validate();
a.setVisible(true);
// Fix for BugTraq ID 4041703.
// Set the default focus for an applet.
if (hasInitialFocus()) {
setDefaultFocus();
}
}
};
AWTAccessor.getEventQueueAccessor().invokeAndWait(applet, r);
} catch (InterruptedException ie) {
} catch (InvocationTargetException ite) {
}
status = APPLET_START;
showAppletStatus("started");
break;
}
case APPLET_STOP:
if (status != APPLET_START) {
showAppletStatus("notstarted");
break;
}
status = APPLET_STOP;
// Hide the applet in event dispatch thread
// to avoid deadlock.
try {
final Applet a = applet;
Runnable r =
new Runnable() {
@Override
public void run() {
a.setVisible(false);
}
};
AWTAccessor.getEventQueueAccessor().invokeAndWait(applet, r);
} catch (InterruptedException ie) {
} catch (InvocationTargetException ite) {
}
// During Applet.stop(), any AccessControlException on an involved Class remains in
// the "memory" of the AppletClassLoader. If the same instance of the ClassLoader is
// reused, the same exception will occur during class loading. Set the
// AppletClassLoader's
// exceptionStatusSet flag to allow recognition of what had happened
// when reusing AppletClassLoader object.
try {
applet.stop();
} catch (java.security.AccessControlException e) {
setExceptionStatus(e);
// rethrow exception to be handled as it normally would be.
throw e;
}
showAppletStatus("stopped");
break;
case APPLET_DESTROY:
if (status != APPLET_STOP && status != APPLET_INIT) {
showAppletStatus("notstopped");
break;
}
status = APPLET_DESTROY;
// During Applet.destroy(), any AccessControlException on an involved Class remains in
// the "memory" of the AppletClassLoader. If the same instance of the ClassLoader is
// reused, the same exception will occur during class loading. Set the
// AppletClassLoader's
// exceptionStatusSet flag to allow recognition of what had happened
// when reusing AppletClassLoader object.
try {
applet.destroy();
} catch (java.security.AccessControlException e) {
setExceptionStatus(e);
// rethrow exception to be handled as it normally would be.
throw e;
}
showAppletStatus("destroyed");
break;
case APPLET_DISPOSE:
if (status != APPLET_DESTROY && status != APPLET_LOAD) {
showAppletStatus("notdestroyed");
break;
}
status = APPLET_DISPOSE;
try {
final Applet a = applet;
Runnable r =
new Runnable() {
@Override
public void run() {
remove(a);
}
};
AWTAccessor.getEventQueueAccessor().invokeAndWait(applet, r);
} catch (InterruptedException ie) {
} catch (InvocationTargetException ite) {
}
applet = null;
showAppletStatus("disposed");
disposed = true;
break;
case APPLET_QUIT:
return;
}
} catch (Exception e) {
status = APPLET_ERROR;
if (e.getMessage() != null) {
showAppletStatus("exception2", e.getClass().getName(), e.getMessage());
} else {
showAppletStatus("exception", e.getClass().getName());
}
showAppletException(e);
} catch (ThreadDeath e) {
showAppletStatus("death");
return;
} catch (Error e) {
status = APPLET_ERROR;
if (e.getMessage() != null) {
showAppletStatus("error2", e.getClass().getName(), e.getMessage());
} else {
showAppletStatus("error", e.getClass().getName());
}
showAppletException(e);
}
clearLoadAbortRequest();
}
}