Am 09.03.2015 18:51, schrieb Mark Roos:
I was thinking about a generic pic, easy to use but flexible and came up
with the following concept api.
By passing the callsite and the testValue around with allowing an
optional pic update I can envision
this as a nice building block for several caching strategies. Of course
this is all based on my use
model which does not use primitives. In summary it reduces the calling
of the test method to only
once and it supports the quick testing of a few targets. Its also easy
to understand how to use without
using Charlies or Remis builders.
Do I also understand right, that your test for checking if the current
target is still valid is limited to only the receiver?
to generate a PIC
MethodHandle createPic(Callsite site, MethodHandle
getTestValue, MethodHandle fallback)
The getTestValue methodHandle returns the object used in the comparison
process
Object getTestValue(Callsite site, Object... stackArgs)
The fallback returns a testValue and MH to use
Object[] fallback(Callsite site, Object testValue, Object...
stackArgs)
where the return value is [Object newTestValue][MethodHandle
newMH] // use case for Tuple
if(newTestValue != null) lookup.insert(newTest, newMH)
newMh.invoke()
This path should also be considered fast as the first step of a
fallback could be to check a cache of MH.
the lookup process could be a simple chain of compare/branch operations.
And the mh replacement could be
a simple circular update. This chain could be limited to less than 5.
I really should write a PIC implementation for Groovy :( Though it won't
be as simple as this one. I need to check for arguments which can be
primitives) and receiver as well as meta class (switchpoint for that
one) So not only do I have to check more things, I also do special
things to not add guards if I can, since each guard costs... though the
information I use there is static so far.
bye Jochen
--
Jochen "blackdrag" Theodorou - Groovy Project Tech Lead
blog: http://blackdragsview.blogspot.com/
german groovy discussion newsgroup: de.comp.lang.misc
For Groovy programming sources visit http://groovy-lang.org
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