Hi Torsten,
Memory for not anymore used ULC components is released when the garbage
collector runs for the next time. ULC does not have any hard references
to ULC components. Therefore it is not necessary to explicitly tell ULC
to dispose ULC components.
Just make sure that you don't have any memory leaks, i.e. keep unwanted
references to the ULC components from inside your ULC application. We
recommend to use a standard Java profiler to check for unwanted references.
The snippet at the end of my mail shows that ULC really releases menu
items that were removed from a menu bar.
Regards Dany
import com.ulcjava.base.application.AbstractAction;
import com.ulcjava.base.application.AbstractApplication;
import com.ulcjava.base.application.ULCBoxPane;
import com.ulcjava.base.application.ULCButton;
import com.ulcjava.base.application.ULCFrame;
import com.ulcjava.base.application.ULCMenu;
import com.ulcjava.base.application.ULCMenuBar;
import com.ulcjava.base.application.ULCMenuItem;
import com.ulcjava.base.application.event.ActionEvent;
import com.ulcjava.base.development.DevelopmentRunner;
public class MemoryUsageBehaviorSnippet extends AbstractApplication {
public void start() {
ULCBoxPane content = new ULCBoxPane(1, 0);
content.add(new ULCButton(new ReplaceMenuBarContentAction()));
content.add(new ULCButton(new RunGCAction()));
ULCMenuBar menuBar = new ULCMenuBar();
MemoryUsageBehaviorSnippet.replaceMenuBarContent(menuBar);
ULCFrame frame = new ULCFrame("Snippet");
frame.setDefaultCloseOperation(ULCFrame.TERMINATE_ON_CLOSE);
frame.setMenuBar(menuBar);
frame.getContentPane().add(content);
frame.setVisible(true);
}
public static void replaceMenuBarContent(ULCMenuBar menuBar) {
ULCMenu menu = new ULCMenu("Menu");
for (int i = 0; i < 5; i++) {
menu.add(new ULCFinalizeMenuItem());
}
menuBar.removeAll();
menuBar.add(menu);
}
public static class ULCFinalizeMenuItem extends ULCMenuItem {
private static int sCounter = 0;
public ULCFinalizeMenuItem() {
super("MenuItem " + sCounter++);
}
protected void finalize() throws Throwable {
System.out.println("finalize: " + getText());
}
}
public static class ReplaceMenuBarContentAction extends AbstractAction {
public ReplaceMenuBarContentAction() {
putValue(NAME, "Replace Menu Bar Content");
}
public void actionPerformed(ActionEvent event) {
ULCMenuBar menuBar = ULCFrame.getFrames()[0].getMenuBar();
MemoryUsageBehaviorSnippet.replaceMenuBarContent(menuBar);
}
}
public static class RunGCAction extends AbstractAction {
public RunGCAction() {
putValue(NAME, "Run GC");
}
public void actionPerformed(ActionEvent event) {
Runtime.getRuntime().gc();
Runtime.getRuntime().runFinalization();
}
}
public static void main(String[] args) {
DevelopmentRunner.setApplicationClass(MemoryUsageBehaviorSnippet.class);
DevelopmentRunner.main(args);
}
}
Hofmann, Torsten wrote:
Hello
I have a question. When will the memory for not anymore used components be
released. I have a strang behaviour, when i am creating dynamical views with
ULCComponents (e.g. ULCMenuBar.removeAll()) the memory not decreases. When is
the memory for example here the ULCMenuItems released?
How could i change this behaviour? Do i have to call the System.gc() und "null"
all Objects?
Regards
Torsten Hofmann
Dipl. - Informatiker (FH)
IT Consultant Business Integration
Würth Phoenix GmbH
Drillberg 6
D-97980 Bad Mergentheim
Phone: +49 7931 91 6284
Fax: +49 7931 91 7284
E-Mail: [EMAIL PROTECTED]
Website: www.wuerth-phoenix.de
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