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Build ID: M20090211-1700 Steps To Reproduce: 1.Create a new Eclipse plug-in 2.Register the (AbstractUIPlugin) as a IElementChangedListener of the (JavaCore) 3. Have the plug-in do some recognizable action when he receives a notification form the (JavaCore) 4. Run the plug-in in the Eclipse-Runtime 5. Change focus from one editor to another. More information: When you activate an editor, the JavaCore will send a ElementChanged event describing a change too every single element contained in the given editor window.
(In reply to comment #0) > Build ID: M20090211-1700 > Steps To Reproduce: > 1.Create a new Eclipse plug-in > 2.Register the (AbstractUIPlugin) as a IElementChangedListener of the > (JavaCore) > 3. Have the plug-in do some recognizable action when he receives a notification > form the (JavaCore) > 4. Run the plug-in in the Eclipse-Runtime > 5. Change focus from one editor to another. > More information: Hello, it would have helped if you had indicated what exactly you thought was a bug. > When you activate an editor, the JavaCore will send a ElementChanged event > describing a change too every single element contained in the given editor > window. Did you register your plugin as an IElementChangedListener via org.eclipse.jdt.core.JavaCore.addElementChangedListener(IElementChangedListener) In that case, what you are seeing would be the right behavior. The numerous element changed notifications you are seeing are due to "working copy reconcile operation". The call to the method addElementChangedListener sets it up so that there is a notification for every ElementChangedEvent.POST_CHANGE and ElementChangedEvent.POST_RECONCILE. Based on your requirements, you may want to use org.eclipse.jdt.core.JavaCore.addElementChangedListener(IElementChangedListener, int) instead which actually allows you choose the events you want to be notified about and you could omit the POST_RECONCILE event if you don't want instantaneous feedback on fine grained changes that are happening to the working copy. Please see also the documentation on ElementChangedEvent class. If I have not understood your problem and you think there is a real bug here, please clarify -- Thanks.
Closing this defect as INVALID since what is reported is the right behavior and a workaround has been suggested to filter out (what are seen to be) the unwanted notifications. Please reopen if defect has been misunderstood.
Not sure to completely understand the problem though as only change the focus does not send any ElementChangedEvent events... But I agree that each time a character is hit in an editor, then registered listeners receive this kind of events and, as I Srikanth said, this is the expected behavior... So consider this as verified for 3.5RC1 as the reconcile event can easily be filtered using the API with the event type mask Skrikanth refers to in comment 1.
(In reply to comment #3) > Not sure to completely understand the problem though as only change the focus > does not send any ElementChangedEvent events... Actually, it does, when a dormant editor tab gets activated for the first time in a session. This triggers a "become working copy" operation which generates a ElementChangedEvent.POST_CHANGE. Switching between editor tabs that were activated already in a session does not generate further ElementChangedEvent's. Similarly, closing an editor by clicking on the X also generates a POST_CHANGE event from the "discard working copy" operation. So fortunately, there is no pending mystery here :) Here is a sample call stack: BytecodePerformance.elementChanged(ElementChangedEvent) line: 149 DeltaProcessor$3.run() line: 1557 SafeRunner.run(ISafeRunnable) line: 42 DeltaProcessor.notifyListeners(IJavaElementDelta, int, IElementChangedListener[], int[], int) line: 1547 DeltaProcessor.firePostChangeDelta(IJavaElementDelta, IElementChangedListener[], int[], int) line: 1381 DeltaProcessor.fire(IJavaElementDelta, int) line: 1357 BecomeWorkingCopyOperation(JavaModelOperation).run(IProgressMonitor) line: 769 BecomeWorkingCopyOperation(JavaModelOperation).runOperation(IProgressMonitor) line: 788 CompilationUnit.becomeWorkingCopy(IProblemRequestor, IProgressMonitor) line: 100 CompilationUnitDocumentProvider.createFileInfo(Object) line: 983 CompilationUnitDocumentProvider(TextFileDocumentProvider).connect(Object) line: 478 CompilationUnitDocumentProvider.connect(Object) line: 1198 CompilationUnitEditor(AbstractTextEditor).doSetInput(IEditorInput) line: 4100 CompilationUnitEditor(StatusTextEditor).doSetInput(IEditorInput) line: 203 CompilationUnitEditor(AbstractDecoratedTextEditor).doSetInput(IEditorInput) line: 1330 CompilationUnitEditor(JavaEditor).internalDoSetInput(IEditorInput) line: 2552 CompilationUnitEditor(JavaEditor).doSetInput(IEditorInput) line: 2525 CompilationUnitEditor.doSetInput(IEditorInput) line: 1371 AbstractTextEditor$19.run(IProgressMonitor) line: 3081 ModalContext.runInCurrentThread(IRunnableWithProgress, IProgressMonitor) line: 464 ModalContext.run(IRunnableWithProgress, boolean, IProgressMonitor, Display) line: 372 ApplicationWindow$1.run() line: 759 BusyIndicator.showWhile(Display, Runnable) line: 70 WorkbenchWindow(ApplicationWindow).run(boolean, boolean, IRunnableWithProgress) line: 756 WorkbenchWindow.run(boolean, boolean, IRunnableWithProgress) line: 2576 CompilationUnitEditor(AbstractTextEditor).internalInit(IWorkbenchWindow, IEditorSite, IEditorInput) line: 3099 CompilationUnitEditor(AbstractTextEditor).init(IEditorSite, IEditorInput) line: 3126 EditorManager.createSite(IEditorReference, IEditorPart, EditorDescriptor, IEditorInput) line: 798 EditorReference.createPartHelper() line: 641 EditorReference.createPart() line: 459 EditorReference(WorkbenchPartReference).getPart(boolean) line: 595 EditorReference.getPart(boolean) line: 821 EditorPane(PartPane).setVisible(boolean) line: 313 PresentablePart.setVisible(boolean) line: 180 PresentablePartFolder.select(IPresentablePart) line: 270 LeftToRightTabOrder.select(IPresentablePart) line: 65 TabbedStackPresentation.selectPart(IPresentablePart) line: 473 EditorStack(PartStack).refreshPresentationSelection() line: 1256 EditorStack(PartStack).setSelection(LayoutPart) line: 1209 EditorStack(PartStack).presentationSelectionChanged(IPresentablePart) line: 843 PartStack.access$1(PartStack, IPresentablePart) line: 829 PartStack$1.selectPart(IPresentablePart) line: 139 TabbedStackPresentation$1.handleEvent(TabFolderEvent) line: 133 DefaultTabFolder(AbstractTabFolder).fireEvent(TabFolderEvent) line: 270 DefaultTabFolder(AbstractTabFolder).fireEvent(int, AbstractTabItem) line: 279 DefaultTabFolder.access$1(DefaultTabFolder, int, AbstractTabItem) line: 1 DefaultTabFolder$2.handleEvent(Event) line: 87 EventTable.sendEvent(Event) line: 84 CTabFolder(Widget).sendEvent(Event) line: 1003 CTabFolder(Widget).sendEvent(int, Event, boolean) line: 1027 CTabFolder(Widget).sendEvent(int, Event) line: 1012 CTabFolder(Widget).notifyListeners(int, Event) line: 770 CTabFolder.setSelection(int, boolean) line: 3256 CTabFolder.onMouse(Event) line: 2045 CTabFolder$1.handleEvent(Event) line: 323 EventTable.sendEvent(Event) line: 84 CTabFolder(Widget).sendEvent(Event) line: 1003 Display.runDeferredEvents() line: 3880 Display.readAndDispatch() line: 3473 Workbench.runEventLoop(Window$IExceptionHandler, Display) line: 2405 Workbench.runUI() line: 2369 Workbench.access$4(Workbench) line: 2221 Workbench$5.run() line: 500 Realm.runWithDefault(Realm, Runnable) line: 332 Workbench.createAndRunWorkbench(Display, WorkbenchAdvisor) line: 493 PlatformUI.createAndRunWorkbench(Display, WorkbenchAdvisor) line: 149 IDEApplication.start(IApplicationContext) line: 113 EclipseAppHandle.run(Object) line: 194 EclipseAppLauncher.runApplication(Object) line: 110 EclipseAppLauncher.start(Object) line: 79 EclipseStarter.run(Object) line: 368 EclipseStarter.run(String[], Runnable) line: 179 NativeMethodAccessorImpl.invoke0(Method, Object, Object[]) line: not available [native method] NativeMethodAccessorImpl.invoke(Object, Object[]) line: 39 DelegatingMethodAccessorImpl.invoke(Object, Object[]) line: 25 Method.invoke(Object, Object...) line: 597 Main.invokeFramework(String[], URL[]) line: 559 Main.basicRun(String[]) line: 514 Main.run(String[]) line: 1311 Main.main(String[]) line: 1287
