JAX-RS: Avoid implicit use of regular expression in
JAXRSUtils.intersectMimeTypes
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Key: CXF-3285
URL: https://issues.apache.org/jira/browse/CXF-3285
Project: CXF
Issue Type: Improvement
Components: JAX-RS
Affects Versions: 2.3.1
Environment: JDK 1.6
Reporter: Ka-Lok Fung
Priority: Minor
Fix For: 2.3.3
While profiling CXF 2.3.1, we found that a small hotspot in
JAXRSUtils.intersectMimeTypes.
Splitting on + triggers the Pattern to be compiled twice and caused unnecessary
code to be run because you're only interested in strings that only have one +.
When we replaced that code with equivalent code using String.indexOf and
String.substring, the code was ~3% faster.
In terms of absolute time in milliseconds here are the values (the test
involved 1 million requests),
Index of and substring:
2635933-361906=2274027
No intersect improvement:
2724713-367039=2357674
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