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https://issues.apache.org/jira/browse/GROOVY-10207?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Daniel Sun closed GROOVY-10207.
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Fix Version/s: (was: 4.x)
Resolution: Won't Fix
Most of Groovy4 bytecodes consist of invokedynamic, only some legacy parts are
still using reflection, we will tweak the bytecode finally. For groovy pre-4,
the improvement is too big to fit the maintainence releases.
> Improve the performance of method invocation with MethodHandle
> --------------------------------------------------------------
>
> Key: GROOVY-10207
> URL: https://issues.apache.org/jira/browse/GROOVY-10207
> Project: Groovy
> Issue Type: Improvement
> Reporter: Daniel Sun
> Priority: Major
>
> *Rationale*
> 1. Generate {{FastMethod}} subclass whose field holds {{MethodHandle}}
> instance at runtime
> 3. Invoke method with {{FastMethod}} instance
> *Tweak {{CachedMethod}} via the above way*
>
> [https://github.com/apache/groovy/blob/master/src/main/java/org/codehaus/groovy/reflection/CachedMethod.java]
> *Simple performance test result*
> Invoking {{java.lang.String#startsWith(java.lang.String)}} for 1000000 times:
> direct: 13ms
> reflection: 34ms
> fastmethod: 10ms
> As we could see, fastmethod runs as almost fast as direct calls, and
> fastmethod runs about 3 times faster than reflection
> *Reference*
>
> [https://www.optaplanner.org/blog/2018/01/09/JavaReflectionButMuchFaster.html]
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