Bug 43766 [reconciling] ResourceMarkerAnnotationModel listener taking a long time
Build: I20030925 I was investigating a situation where adding breakpoints to a large file was very slow. It can take up to a second to add a breakpoint to a file such as Workspace.java (2000 lines). Almost all of this time is in the resource change listener added by ResourceMarkerAnnotationModel. First, a minor issue: Instead of adding a resource change listener that traverses the entire delta, you can locate a given resource delta within the resource change delta very quickly using IResourceDelta.findMember(): public void resourceChanged(IResourceChangeEvent e) { IResourceDelta delta= e.getDelta(); if (delta != null) { IResourceDelta child = delta.findMember(fResource.getFullPath()); if (child != null) update(child.getMarkerDeltas()); } } However, this was only a small speed improvement. The main problem is that the entire compilation unit is reparsed every time a breakpoint is added. I have added a profiler trace of where the time is going for adding a single breakpoint.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/filebuffers/CompilationUnitDocumentProvider2.java
}
			/**
			 * @see IAnnotationModelListenerExtension#modelChanged(AnnotationModelEvent)
			 */
			public void modelChanged(AnnotationModelEvent event) {
				Object[] listeners= fListenerList.getListeners();
				for (int i= 0; i < listeners.length; i++) {
					Object curr= listeners[i];
					if (curr instanceof IAnnotationModelListenerExtension) {
						((IAnnotationModelListenerExtension) curr).modelChanged(event);
					}
				}
			}
			
			public void addListener(IAnnotationModelListener listener) {
				fListenerList.add(listener);
			}
			
			public void removeListener(IAnnotationModelListener listener) {
				fListenerList.remove(listener);
			}			
		}		
		
	
	private final static String HANDLE_TEMPORARY_PROBLEMS= PreferenceConstants.EDITOR_EVALUTE_TEMPORARY_PROBLEMS;
	
	
	
	private boolean fIsAboutToSave= false;