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From henrib <hen...@apache.org>
Subject Re: [ognl] internal cache performance improvement
Date Tue, 07 Jun 2011 08:43:10 GMT
Hi Simo;
You might want to take a look at jexl in the
org.apache.commons.jexl2.internal.introspection and
org.apache.commons.jexl2.internal packages for ideas, more specifically at
IntrospectorBase.

Jexl caching is roughly a hashmap keyed by classes whose values are
(essentially) hashmap keyed on method signatures pointing to methods. Cache
access is synchronized and the whole cache is soft-refed so it can be
evicted on memory pressure (or class loader change).
To further reduce contention, the jexl interpreter caches method references
in AST nodes through a volatile member; after the first execution, the
script/statement retries to call the cached method. It will only go back to
the class cache if the call is unsuccessful.

At a higher level but I'm not sure it is practical, the
org.apache.commons.jexl2.introspection package could be (re)used; it
abstracts the whole introspection parts caching included.

Hope this can help,
Cheers
Henrib

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