[jbosstools-dev] Help needed on Eclipse Search performance

[Xavier Coulon]

Hello,

Pete Muir opened an issue a few weeks ago (https://issues.jboss.org/browse/JBIDE-12224) because he found that the JAX-RS tooling was sometimes taking too much time to build. He also attached a video to show what's happening on his machine: http://screencast.com/t/pHBqxVas4

Now, at the tooling level, here's what's happening: a set of jars are added to the classpath, and as part of the project build, the JAX-RS builder searches for some JAX-RS annotated types or methods in those new jars, using the Search API. Hélas, Eclipse needs to index those jars, which sometimes takes a few seconds.
Now, as opposed to the CDI specification where the jars should have a marker file (META-INF/beans.xml), JAX-RS does not mandate anything similar, which means that the search includes all the jars..

Here's an example of the code that deals with annotated types search (in ws/plugins/org.jboss.tools.ws.jaxrs.core/src/org/jboss/tools/ws/jaxrs/core/jdt/JaxrsAnnotationsScanner.java) :

	private static List<IType> searchForAnnotatedTypes(final Class<?> annotation, final IJavaSearchScope searchScope,
			final IProgressMonitor progressMonitor) throws CoreException {
		JavaMemberSearchResultCollector collector = new JavaMemberSearchResultCollector(IJavaElement.TYPE, searchScope);
		SearchPattern pattern = SearchPattern.createPattern(annotation.getName(), IJavaSearchConstants.ANNOTATION_TYPE,
				IJavaSearchConstants.ANNOTATION_TYPE_REFERENCE | IJavaSearchConstants.TYPE, SearchPattern.R_EXACT_MATCH
						| SearchPattern.R_CASE_SENSITIVE);
		// perform search, results are added/filtered by the custom
		// searchRequestor defined above
		new SearchEngine().search(pattern, new SearchParticipant[] { SearchEngine.getDefaultSearchParticipant() },
				searchScope, collector, progressMonitor);
		return collector.getResult(IType.class);
	}


Do you know any way to reduce the latency at this level ? Is there any trick to improve the speed ?
 
Thanks in advance
Best regards,
/Xavier



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