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Author: zmedico |
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Date: 2008-06-20 16:18:46 +0000 (Fri, 20 Jun 2008) |
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New Revision: 10741 |
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|
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Modified: |
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main/trunk/pym/portage/dep.py |
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Log: |
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Use a metaclass to cache Atom instances transparently. This should improve |
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performance and conserve memory in cases when the same atom is more than |
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once. |
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|
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|
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Modified: main/trunk/pym/portage/dep.py |
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=================================================================== |
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--- main/trunk/pym/portage/dep.py 2008-06-20 14:37:49 UTC (rev 10740) |
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+++ main/trunk/pym/portage/dep.py 2008-06-20 16:18:46 UTC (rev 10741) |
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@@ -392,6 +392,15 @@ |
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tokens.extend(self.conditional_disabled.difference(use)) |
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return _use_dep(tokens) |
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|
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+class _AtomCache(type): |
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+ atoms = {} |
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+ def __call__(cls, s): |
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+ instance = cls.atoms.get(s) |
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+ if instance is None: |
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+ instance = super(_AtomCache, cls).__call__(s) |
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+ cls.atoms[s] = instance |
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+ return instance |
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+ |
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class Atom(object): |
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|
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""" |
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@@ -399,6 +408,8 @@ |
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class emulates most of the str methods that are useful with atoms. |
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""" |
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|
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+ __metaclass__ = _AtomCache |
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+ |
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_str_methods = ("endswith", "find", "index", "lstrip", "replace", |
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"startswith", "strip", "rindex", "rfind", "rstrip", "__getitem__", |
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"__len__", "__repr__", "__str__") |
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|
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-- |
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