Reduce cpu usage for proxy creation #687
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lukasj
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Jun 17, 2024
DaScheid
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Updated license agreement, made changes as requested |
Some tests implicitly require a specific line-ending or a locale to be set. Adjusting those to run the test-suites without changing the local dev-setup.
Cache JAXBContext to avoid frequent instantiations of it. The benefit of this caching depend on the use implementation of "jakarta.xml.bind.JAXBContextFactory", e.g. the glassfish-implementation is faster as some others, so the computation-time saved here is lower when using glassfish-impl compared to using a slower implementation.
Creating a MetroConfigLoader requires frequent class- and resource-loading, so re-use factories when applicable
Iterating over the ServiceLoader results in class- and resource-loading, which becomes expensive if done extensively.
A common pattern used (in e.g. "com.sun.xml.ws.api.pipe.TransportTubeFactory::create") is to search first for multiple factory-implementations before falling back to a "default" factory / implementation:
public Type exampleFunc(...) {
for (_ : ServiceFinder.find(FactoryType1.class) { return if FactoryType1-impl found }
for (_ : ServiceFinder.find(FactoryType2.class) { return if FactoryType2-impl found }
return DEFAULT_FACTORY.createType(..);
}
If there are no other implementations present besides the default-fallback-implementation, then each call to a method with this structure starts searching (again) for all non-default implementations - only to not find any implementing classes and finally falling back to the default-implementation.
Invoking such method-structures often, results in multiple unnecessary ServiceLoader-calls, because if the corresponding service-class and classloader are identical to a previous call and for this previous call the classloader was not able to determine the service-implementation, then it still won't be able to find it when retrying the ServiceLoader-call with the same parameters.
DaScheid
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Rebased onto latest master-branch. PR would be ready for review, @lukasj |
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Related issue #686