SVN: Sandbox/chrism/zodb/3.6.0/weakset/ zope_weakset egg module.

Log message for revision 65769:
  zope_weakset egg module.
  

Changed:
  A   Sandbox/chrism/zodb/3.6.0/weakset/
  A   Sandbox/chrism/zodb/3.6.0/weakset/setup.py
  A   Sandbox/chrism/zodb/3.6.0/weakset/src/
  A   Sandbox/chrism/zodb/3.6.0/weakset/src/zope/
  A   Sandbox/chrism/zodb/3.6.0/weakset/src/zope/__init__.py
  A   Sandbox/chrism/zodb/3.6.0/weakset/src/zope/weakset/
  A   Sandbox/chrism/zodb/3.6.0/weakset/src/zope/weakset/__init__.py
  A   Sandbox/chrism/zodb/3.6.0/weakset/src/zope/weakset/tests.py

-=-
Added: Sandbox/chrism/zodb/3.6.0/weakset/setup.py
===================================================================
--- Sandbox/chrism/zodb/3.6.0/weakset/setup.py	2006-03-03 15:16:45 UTC (rev 65768)
+++ Sandbox/chrism/zodb/3.6.0/weakset/setup.py	2006-03-03 18:12:44 UTC (rev 65769)
@@ -0,0 +1,66 @@
+##############################################################################
+#
+# Copyright (c) 2006 Zope Corporation and Contributors.
+# All Rights Reserved.
+#
+# This software is subject to the provisions of the Zope Public License,
+# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
+# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
+# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
+# FOR A PARTICULAR PURPOSE.
+#
+##############################################################################
+"""Zope Object Database: object database and persistence
+
+The Zope Object Database provides an object-oriented database for
+Python that provides a high-degree of transparency. Applications can
+take advantage of object database features with few, if any, changes
+to application logic.  ZODB includes features such as a plugable storage
+interface, rich transaction support, and undo.
+
+This distribution includes the weakset module from ZODB.
+"""
+
+# The (non-obvious!) choices for the Trove Development Status line:
+# Development Status :: 5 - Production/Stable
+# Development Status :: 4 - Beta
+# Development Status :: 3 - Alpha
+
+import os
+from setuptools import setup
+
+classifiers = """\
+Development Status :: 5 - Production/Stable
+Intended Audience :: Developers
+License :: OSI Approved :: Zope Public License
+Programming Language :: Python
+Topic :: Database
+Topic :: Software Development :: Libraries :: Python Modules
+Operating System :: Microsoft :: Windows
+Operating System :: Unix
+"""
+
+setup(name='zope_weakset',
+      version='3.6.0',
+      url='http://svn.zope.org/ZODB',
+      download_url = "http://www.zope.org/Products/ZODB3.6",
+      license='ZPL 2.1',
+      description='ZODB weakset implementation',
+      author='Zope Corporation and Contributors',
+      maintainer='Zope Corporation and Contributors',
+      author_email='[email protected]',
+      maintainer_email='[email protected]',
+      platforms = ['any'],
+      classifiers = filter(None, classifiers.split("\n")),
+      long_description = __doc__,
+      packages=['zope', 'zope.weakset'],
+      package_dir = {'': 'src'},
+      namespace_packages = ['zope'],
+      tests_require = [],
+      install_requires=[],
+      include_package_data = True,
+      zip_safe = True,
+      )
+
+


Property changes on: Sandbox/chrism/zodb/3.6.0/weakset/setup.py
___________________________________________________________________
Name: svn:eol-style
   + native

Added: Sandbox/chrism/zodb/3.6.0/weakset/src/zope/__init__.py
===================================================================
--- Sandbox/chrism/zodb/3.6.0/weakset/src/zope/__init__.py	2006-03-03 15:16:45 UTC (rev 65768)
+++ Sandbox/chrism/zodb/3.6.0/weakset/src/zope/__init__.py	2006-03-03 18:12:44 UTC (rev 65769)
@@ -0,0 +1 @@
+# Package


Property changes on: Sandbox/chrism/zodb/3.6.0/weakset/src/zope/__init__.py
___________________________________________________________________
Name: svn:eol-style
   + native

Added: Sandbox/chrism/zodb/3.6.0/weakset/src/zope/weakset/__init__.py
===================================================================
--- Sandbox/chrism/zodb/3.6.0/weakset/src/zope/weakset/__init__.py	2006-03-03 15:16:45 UTC (rev 65768)
+++ Sandbox/chrism/zodb/3.6.0/weakset/src/zope/weakset/__init__.py	2006-03-03 18:12:44 UTC (rev 65769)
@@ -0,0 +1,81 @@
+##############################################################################
+#
+# Copyright (c) 2001, 2002 Zope Corporation and Contributors.
+# All Rights Reserved.
+#
+# This software is subject to the provisions of the Zope Public License,
+# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
+# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
+# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
+# FOR A PARTICULAR PURPOSE
+#
+##############################################################################
+
+import weakref
+
+# A simple implementation of weak sets, supplying just enough of Python's
+# sets.Set interface for our needs.
+
+class WeakSet(object):
+    """A set of objects that doesn't keep its elements alive.
+
+    The objects in the set must be weakly referencable.
+    The objects need not be hashable, and need not support comparison.
+    Two objects are considered to be the same iff their id()s are equal.
+
+    When the only references to an object are weak references (including
+    those from WeakSets), the object can be garbage-collected, and
+    will vanish from any WeakSets it may be a member of at that time.
+    """
+
+    def __init__(self):
+        # Map id(obj) to obj.  By using ids as keys, we avoid requiring
+        # that the elements be hashable or comparable.
+        self.data = weakref.WeakValueDictionary()
+
+    def __len__(self):
+        return len(self.data)
+
+    def __contains__(self, obj):
+        return id(obj) in self.data
+
+    # Same as a Set, add obj to the collection.
+    def add(self, obj):
+        self.data[id(obj)] = obj
+
+    # Same as a Set, remove obj from the collection, and raise
+    # KeyError if obj not in the collection.
+    def remove(self, obj):
+        del self.data[id(obj)]
+
+    # f is a one-argument function.  Execute f(elt) for each elt in the
+    # set.  f's return value is ignored.
+    def map(self, f):
+        for wr in self.as_weakref_list():
+            elt = wr()
+            if elt is not None:
+                f(elt)
+
+    # Return a list of weakrefs to all the objects in the collection.
+    # Because a weak dict is used internally, iteration is dicey (the
+    # underlying dict may change size during iteration, due to gc or
+    # activity from other threads).  as_weakef_list() is safe.
+    #
+    # Something like this should really be a method of Python's weak dicts.
+    # If we invoke self.data.values() instead, we get back a list of live
+    # objects instead of weakrefs.  If gc occurs while this list is alive,
+    # all the objects move to an older generation (because they're strongly
+    # referenced by the list!).  They can't get collected then, until a
+    # less frequent collection of the older generation.  Before then, if we
+    # invoke self.data.values() again, they're still alive, and if gc occurs
+    # while that list is alive they're all moved to yet an older generation.
+    # And so on.  Stress tests showed that it was easy to get into a state
+    # where a WeakSet grows without bounds, despite that almost all its
+    # elements are actually trash.  By returning a list of weakrefs instead,
+    # we avoid that, although the decision to use weakrefs is now# very
+    # visible to our clients.
+    def as_weakref_list(self):
+        # We're cheating by breaking into the internals of Python's
+        # WeakValueDictionary here (accessing its .data attribute).
+        return self.data.data.values()


Property changes on: Sandbox/chrism/zodb/3.6.0/weakset/src/zope/weakset/__init__.py
___________________________________________________________________
Name: svn:eol-style
   + native

Added: Sandbox/chrism/zodb/3.6.0/weakset/src/zope/weakset/tests.py
===================================================================
--- Sandbox/chrism/zodb/3.6.0/weakset/src/zope/weakset/tests.py	2006-03-03 15:16:45 UTC (rev 65768)
+++ Sandbox/chrism/zodb/3.6.0/weakset/src/zope/weakset/tests.py	2006-03-03 18:12:44 UTC (rev 65769)
@@ -0,0 +1,80 @@
+##############################################################################
+#
+# Copyright (c) 2006 Zope Corporation and Contributors.
+# All Rights Reserved.
+#
+# This software is subject to the provisions of the Zope Public License,
+# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
+# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
+# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
+# FOR A PARTICULAR PURPOSE
+#
+##############################################################################
+
+import unittest
+from __init__ import WeakSet
+
+class Dummy:
+    pass
+
+class WeakSetTests(unittest.TestCase):
+    def test_contains(self):
+        w = WeakSet()
+        dummy = Dummy()
+        w.add(dummy)
+        self.assertEqual(dummy in w, True)
+        dummy2 = Dummy()
+        self.assertEqual(dummy2 in w, False)
+
+    def test_len(self):
+        w = WeakSet()
+        d1 = Dummy()
+        d2 = Dummy()
+        w.add(d1)
+        w.add(d2)
+        self.assertEqual(len(w), 2)
+        del d1
+        self.assertEqual(len(w), 1)
+
+    def test_remove(self):
+        w = WeakSet()
+        dummy = Dummy()
+        w.add(dummy)
+        self.assertEqual(dummy in w, True)
+        w.remove(dummy)
+        self.assertEqual(dummy in w, False)
+
+    def test_as_weakref_list(self):
+        w = WeakSet()
+        dummy = Dummy()
+        dummy2 = Dummy()
+        dummy3 = Dummy()
+        w.add(dummy)
+        w.add(dummy2)
+        w.add(dummy3)
+        del dummy3
+        L = [x() for x in w.as_weakref_list()]
+        self.assertEqual(L, [dummy, dummy2])
+
+    def test_map(self):
+        w = WeakSet()
+        dummy = Dummy()
+        dummy2 = Dummy()
+        dummy3 = Dummy()
+        w.add(dummy)
+        w.add(dummy2)
+        w.add(dummy3)
+        def poker(x):
+            x.poked = 1
+        w.map(poker)
+        for thing in dummy, dummy2, dummy3:
+            self.assertEqual(thing.poked, 1)
+        
+        
+def test_suite():
+    return unittest.makeSuite(WeakSetTests)
+
+if __name__ == '__main__':
+    unittest.main()
+    


Property changes on: Sandbox/chrism/zodb/3.6.0/weakset/src/zope/weakset/tests.py
___________________________________________________________________
Name: svn:eol-style
   + native

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