| Caching or improving search [message #867501] |
Tue, 01 May 2012 10:25  |
|
Hi all,
I'm quite new to Eclipse development so please forgive me for any big mistake and please be detailed in your answers  .
I've started an open source project to provide some editors for BDD tools (Cucumber and JBehave) and I'm successfully using Xtext to create the editors.
I wanted to add the capability to link a step definition (a grammar element in both editors) to Java methods: let me explain what I mean.
If I encounter (in my bdd editor) something like Given the user does something I want to hyperlink it to any Java method annotated with Given, When, Then, And or But and an annotation value that represents a regular expression matching with the string "the user does something" so those are all valid matches:
- @Given("the user does .*")
- @But("user do.*")
- @Then("^the user .*$")
The following is the code I'm using:
for (final String annotationName : annotationNames) {
SearchPattern pattern = SearchPattern.createPattern(annotationName, IJavaSearchConstants.ANNOTATION_TYPE,
IJavaSearchConstants.ANNOTATION_TYPE_REFERENCE, SearchPattern.R_EXACT_MATCH | SearchPattern.R_CASE_SENSITIVE);
SearchRequestor requestor = new SearchRequestor() {
public void acceptSearchMatch(SearchMatch match) throws CoreException {
if (match.getElement() instanceof IMethod) {
IMethod method = (IMethod) match.getElement();
// verify pattern
IAnnotation type = method.getAnnotation(annotationName);
String annotationValue = (String) type.getMemberValuePairs()[0].getValue();
if (step.matches(annotationValue)) {
results.add(new JavaHyperlink("Open mapping " + annotationValue, method, region));
}
}
}
};
try {
new SearchEngine().search(pattern, new SearchParticipant[] { SearchEngine.getDefaultSearchParticipant() }, SearchEngine.createWorkspaceScope(),
requestor, null);
} catch (CoreException e) {
e.printStackTrace();
}
}
As you can imagine performing 5 searches on a large code basis and executing all those regular expression matches is time consuming and I wish to improve the plugin performances by pre-calculating the results in the background and caching them. I need to update the cache whenever a Java build (partial or full) is issued tho and here come my questions:
- How can I do it (updating the cache) considering I'm into a non Java file editor and possibly not even in a Java project (the project is in the workspace or a project dependency tho)?
- Can I get notified of which classes have been recompiled so that I can issue partial updates of the cache?
- Is there any Eclipse specific data structure I can use or should I build my own data structure to hold those values?
- Am I completely misusing the Eclipse JDT API and may be there's a better solution to my problem I haven't considered?
Thank you very much.
|
|
|
|
| Re: Caching or improving search [message #868710 is a reply to message #868588] |
Wed, 02 May 2012 12:37  |
|
Thanks Satyam, this is good news.
The currently open file is not a Java file but a Cucumber file and the annotation can be in any Java class in the project classpath... Those classes do not have to inherit or use any annotation so, yes, I think I've to scan all the available classes.
Anyone aware of a cache structure I might use?
I was thinking I can use two hash maps: one to index the results by java class (so that when a Java class get compiled I can update only the results associated with that class) and the other to index the results by feature file (so that I can update only the results affected by the change in that file).
If the hash maps are a good choice where do you suggest to store them? In the plugin activator class? Should I persist those caches or it's more Eclipse style to rebuild them on plugin startup?
|
|
|
Powered by
FUDForum. Page generated in 0.46676 seconds
] 
Search
Help
Register
Login
Home
