From: Zac Medico <zmedico@gentoo.org>
Date: Fri, 20 Jun 2008 16:18:46 +0000 (-0000)
Subject: Use a metaclass to cache Atom instances transparently. This should improve
X-Git-Tag: v2.2_rc2~373
X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=89a06fc9d0ab02ace3f8847da2357c5c6f9794a1;p=portage.git

Use a metaclass to cache Atom instances transparently. This should improve
performance and conserve memory in cases when the same atom is more than
once.

svn path=/main/trunk/; revision=10741
---

diff --git a/pym/portage/dep.py b/pym/portage/dep.py
index 03f428495..a1908276b 100644
--- a/pym/portage/dep.py
+++ b/pym/portage/dep.py
@@ -392,6 +392,15 @@ class _use_dep(object):
 		tokens.extend(self.conditional_disabled.difference(use))
 		return _use_dep(tokens)
 
+class _AtomCache(type):
+	atoms = {}
+	def __call__(cls, s):
+		instance = cls.atoms.get(s)
+		if instance is None:
+			instance = super(_AtomCache, cls).__call__(s)
+			cls.atoms[s] = instance
+		return instance
+
 class Atom(object):
 
 	"""
@@ -399,6 +408,8 @@ class Atom(object):
 	class emulates most of the str methods that are useful with atoms.
 	"""
 
+	__metaclass__ = _AtomCache
+
 	_str_methods = ("endswith", "find", "index", "lstrip", "replace",
 		"startswith", "strip", "rindex", "rfind", "rstrip", "__getitem__",
 		"__len__", "__repr__", "__str__")