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From "Apache Bloodhound" <bloodhound-...@incubator.apache.org>
Subject [Apache Bloodhound] Proposals/BEP-0003 modified
Date Thu, 10 Jan 2013 04:04:03 GMT
Page "Proposals/BEP-0003" was changed by olemis
Diff URL: <https://issues.apache.org/bloodhound/wiki/Proposals/BEP-0003?action=diff&version=27>
Revision 27
Comment: [BEP-0003] Product environment as parametric singletons . Summary of debate in #bloodhound
@ freenode and feedback from brane .
Changes:
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Index: Proposals/BEP-0003
=========================================================================
--- Proposals/BEP-0003 (version: 26)
+++ Proposals/BEP-0003 (version: 27)
@@ -69,6 +69,30 @@
 TypeError: Initializer must be called with 
     trac.env.Environment instance as first argument 
     (got multiproduct.env.ProductEnvironment instance instead)
+
+}}}
+
+''Product environments'' are [http://www.jot.fm/issues/issue_2007_03/column2/ parametric
singletons] on the combination of environment and product prefix . In other words this means
that 
+
+{{{
+#!py
+
+>>> ProductEnvironment(env, prefix) is ProductEnvironment(env, prefix)
+True
+
+}}}
+
+
+{{{
+#!div class="well"
+
+{{{
+#!span class="label label-info"
+
+  Implementation notes
+}}} 
+
+In order to make this happen and yet avoid object explosion , some caching strategy (e.g.
[http://en.wikipedia.org/wiki/Cache_algorithms#Least_Recently_Used LRU cache] like [http://docs.python.org/dev/library/functools.html#functools.lru_cache
functools.lru_cache] or equivalent) should be installed in place , maybe combined with [http://docs.python.org/2.7/library/weakref.html
weak references] .
 
 }}}
 
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