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https://issues.apache.org/jira/browse/CXF-7716?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16447445#comment-16447445
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ASF GitHub Bot commented on CXF-7716:
-------------------------------------
reta commented on a change in pull request #407: [CXF-7716] Reduce
StringBuilders and other performance changes.
URL: https://github.com/apache/cxf/pull/407#discussion_r183259135
##########
File path:
rt/frontend/jaxrs/src/main/java/org/apache/cxf/jaxrs/utils/JAXRSUtils.java
##########
@@ -1508,11 +1509,40 @@ public static boolean matchMimeTypes(MediaType
requestContentType,
}
}
}
-
return new ArrayList<>(supportedMimeTypeList);
+ }
+
+ public static boolean doMimeTypesIntersect(List<MediaType>
requiredMediaTypes, List<MediaType> userMediaTypes) {
+ for (MediaType requiredType : requiredMediaTypes) {
Review comment:
Regarding this part, I understand the purpose, but now there 2 identical
places, `intersectMimeTypes` and `doMimeTypesIntersect`, with the same code
(solving one problem but introducing another). What I am thinking about is to
introduce some kind of accumulator to either map the result of the operation to
the `List` or `true/false`, do you think it would be possible @WhiteCat22 ?
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> IBM Performance Team has found several performance increases
> ------------------------------------------------------------
>
> Key: CXF-7716
> URL: https://issues.apache.org/jira/browse/CXF-7716
> Project: CXF
> Issue Type: Bug
> Components: JAX-RS
> Affects Versions: 3.0.15, 3.2.4
> Reporter: Adam Anderson
> Priority: Major
> Fix For: 3.2.5
>
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> Our performance team has identified several areas of improvement to reduce
> garbage collection and CPU usage.
> First, we reduced the amount of StringBuilders created in HTTPUtils.java and
> ResourceUtils.java.
> Second, we created JAXRSUtils.doMimeTypesIntersect() - a method similar to
> JAXRSUtils.intersectMimeTypes - that doesn't create a HashSet but instead
> returns a boolean when we just need to know if they intersect.
> Third, we found that getting the annotations for parameters to create
> constructor arguments in PerRequestResourceProvider.java is expensive, so we
> cache them in the constructor instead of getting them via reflection every
> request.
> These changes combined result in a ~1.5-2% performance increase.
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