ClassValue perf?

[Jochen Theodorou]

Am 27.04.2015 19:17, schrieb Charles Oliver Nutter:
> It seems I may have to write some benchmarks for this then. Just so I
> understand, the equivalent non-ClassValue-based store would need to:
>
> * Be atomic; value may calculate more than once but only be set once.
> * Be weak; classes given class values must not be rooted as a result
> (an external impl like in JRuby or Groovy would have to use weak maps
> for this).
>
> Jochen: Is your class-to-metaclass map usable apart from the Groovy codebase?

Yes. Look for org.codehaus.groovy.reflection.GroovyClassValuePreJava7 
which is normally wrapped by a factory. You can do for example

> final AtomicInteger counter = new AtomicInteger();
> GroovyClassValue<String> classValue = new GroovyClassValuePreJava7(new ComputeValue<String>() {
>     String computeValue(Class<?> type){
>         counter.incrementAndGet()
>         return type.name;
> }});

normally of course we don't store strings, normally we store ClassInfo 
objects, which then break down to the meta classes and per instance meta 
classes ;)

bye blackdrag

-- 
Jochen "blackdrag" Theodorou
blog: http://blackdragsview.blogspot.com/