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
return true;
			}
			
			/*
			 * @see IJavaAnnotation#getArguments()
			 */
			public String[] getArguments() {
				return isProblem() ? fProblem.getArguments() : null;
			}
			/*
			 * @see IJavaAnnotation#getId()
			 */
			public int getId() {
				return fProblem.getID();
			}
			/*
			 * @see IJavaAnnotation#isProblem()
			 */
			public boolean isProblem() {
				return  WARNING_ANNOTATION_TYPE.equals(fType) || ERROR_ANNOTATION_TYPE.equals(fType);
			}
			
			/*
			 * @see IJavaAnnotation#isRelevant()
			 */
			public boolean isRelevant() {
				return true;
			}
			
			/*