/**
* Is called from current runtime system of the java machine on shutdown. We inform all current
* registered listener and views. They should deinitialize her internal things then.
*/
@Override
public void run() {
synchronized (this) {
if (mbShutdownActive) return;
mbShutdownActive = true;
}
while (true) {
IShutdownListener aListener = null;
synchronized (mlListener) {
if (!mlListener.isEmpty()) aListener = mlListener.get(0);
}
if (aListener == null) break;
aListener.shutdown();
// May this listener has deregistered himself.
// But if not we must do it for him. Our own
// method "removeListener()" ignore requests for
// already gone listener objects.
removeListener(aListener);
}
if (mlViews != null) {
synchronized (mlViews) {
mlViews.clear();
mlViews = null;
}
}
if (mlListener != null) {
synchronized (mlListener) {
mlListener.clear();
mlListener = null;
}
}
}
/**
* This deregister a view from this global container. Normally it should be the last reference to
* the view and her finalize() method should be called. If last view will be closed here - we
* terminate these java application too. Because there is no further visible frame anymore.
*
* @param aView view object which wish to be deregistered
*/
public void removeView(Object aView) {
int nViewCount = 0;
synchronized (mlViews) {
if (mlViews.contains(aView)) mlViews.remove(aView);
nViewCount = mlViews.size();
if (nViewCount < 1) mlViews = null;
}
// If this view is a registered shutdown listener on this view container
// too, we must call his interface and forget him as possible listener.
// It's necessary to guarantee his dead ...
boolean bShutdownView = false;
synchronized (mlListener) {
bShutdownView = mlListener.contains(aView);
if (bShutdownView) mlListener.remove(aView);
}
if (bShutdownView) ((IShutdownListener) aView).shutdown();
// We use a system.exit() to finish the whole application.
// And further we have registered THIS instance as a possible shutdown
// hook at the runtime class. So our run() method will be called.
// Our view container should be empty - but
// our listener container can include some references.
// These objects will be informed then and release e.g. some
// remote references.
if (nViewCount < 1) {
boolean bNecessary = false;
synchronized (this) {
bNecessary = !mbShutdownActive;
}
if (bNecessary) {
System.out.println("call exit(0)!");
System.exit(0);
}
}
}
