JAXRSUtils: Avoid calling Message unless it'll be logged
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Key: CXF-3324
URL: https://issues.apache.org/jira/browse/CXF-3324
Project: CXF
Issue Type: Improvement
Components: JAX-RS
Affects Versions: 2.3.2
Environment: JDK 1.6
Reporter: Ka-Lok Fung
Priority: Minor
Fix For: 2.3.3
Our performance and reliability testing has shown that Message.toString() is
called many times in JAXRSUtils.selectResourceClass and
JAXRSUtils.findTargetMethod. It takes up 2.5% of our CPU when these messages
aren't even being logged. An image from the profiler showing this hotspot is
attached.
According to our tests, if you pre-check if the message is loggable (e.g., if
(LOG.isLoggable(Level.FINE))) and logging is set to the default level, the
throughput is increased by 2% and the CPU time is reduced by an equal amount.
The lines where this change would have the most impact are indicated in the
image.
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