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
public ICompilationUnit fCopy;
		}
		
		/**
		 * Annotation representating an <code>IProblem</code>.
		 */
		static protected class ProblemAnnotation extends Annotation implements IJavaAnnotation, IAnnotationExtension {
			private static final String TASK_ANNOTATION_TYPE= "org.eclipse.ui.workbench.texteditor.task"; 
			private static final String ERROR_ANNOTATION_TYPE= "org.eclipse.ui.workbench.texteditor.error"; 
			private static final String WARNING_ANNOTATION_TYPE= "org.eclipse.ui.workbench.texteditor.warning"; 
			private static final String INFO_ANNOTATION_TYPE= "org.eclipse.ui.workbench.texteditor.info"; 
			private static Image fgQuickFixImage;
			private static Image fgQuickFixErrorImage;
			private static boolean fgQuickFixImagesInitialized= false;
			
			private ICompilationUnit fCompilationUnit;
			private List fOverlaids;
			private IProblem fProblem;
			private Image fImage;
			private boolean fQuickFixImagesInitialized= false;
			private String fType;
			
			
			public ProblemAnnotation(IProblem problem, ICompilationUnit cu) {
				
				fProblem= problem;
				fCompilationUnit= cu;