Create support for caching

[jonasabreu]

Reflection can be very expensive. Caching is a good solution.

[jonasabreu]

Postponing to Mirror 2.0.

[garcia-jj]

I don't know if caching reflection is too good. OpenJDK already do some cache optimization in java.lang.Class. As example if you see the method Class.getMethod calls privateGetPublicMethods() that uses ReflectionData that caches reflection info.

So I think that we can get too big improvements adding cache in the Mirror.

[jonasabreu]

The idea behind this issue was to check if it was possible to use some internals and a bit of trickery to improve speed. At least till java 6, the openjdk had (I have not checked this in a long while) an internal interface to represent a method (sun.reflect.MethodAccessor) that was cached and reused inside Method (http://grepcode.com/file/repository.grepcode.com/java/root/jdk/openjdk/6-b14/java/lang/reflect/Method.java ). Changing this method accessor to something we created, we could basically cache anything we wanted. But I never got too deep and still don't know if it is possible.