From a456fd54759fb99d6575c8abe85cbbba638b3179 Mon Sep 17 00:00:00 2001
From: Mike Bayer <mike_mp@zzzcomputing.com>
Date: Thu, 27 Apr 2006 23:56:09 +0000
Subject: [PATCH] the latest and greatest method to keep attributes from
 growing

---
 lib/sqlalchemy/attributes.py | 27 +++++----------------------
 test/attributes.py           |  3 ++-
 test/masscreate2.py          | 36 ++++++++++++++++++++++++++++++++++++
 test/massload.py             |  2 +-
 4 files changed, 44 insertions(+), 24 deletions(-)
 create mode 100644 test/masscreate2.py

diff --git a/lib/sqlalchemy/attributes.py b/lib/sqlalchemy/attributes.py
index 98884df441..627cac4b61 100644
--- a/lib/sqlalchemy/attributes.py
+++ b/lib/sqlalchemy/attributes.py
@@ -79,8 +79,12 @@ class ManagedAttribute(object):
     ManagedAttribute objects associated with the instance via this dictionary."""
     def __init__(self, obj, key):
         self.__obj = weakref.ref(obj)
-        #self.obj = obj
         self.key = key
+    def __getstate__(self):
+        return {'key':self.key, 'obj':self.obj}
+    def __setstate__(self, d):
+        self.key = d['key']
+        self.__obj = weakref.ref(d['obj'])
     obj = property(lambda s:s.__obj())
     def history(self, **kwargs):
         return self
@@ -496,25 +500,4 @@ class AttributeManager(object):
         will be passed along to newly created ManagedAttribute."""
         if not hasattr(class_, '_attribute_manager'):
             class_._attribute_manager = self
-            class_._managed_attributes = ObjectAttributeGateway()
         setattr(class_, key, self.create_prop(class_, key, uselist, callable_, **kwargs))
-
-managed_attributes = weakref.WeakKeyDictionary()
-
-class ObjectAttributeGateway(object):
-    """handles the dictionary of ManagedAttributes for instances.  this level of indirection
-    is to prevent circular references upon objects, as well as keeping them Pickle-compatible."""
-    def __set__(self, obj, value):
-        managed_attributes[obj] = value
-    def __delete__(self, obj):
-        try:
-            del managed_attributes[obj]
-        except KeyError:
-            raise AttributeError()
-    def __get__(self, obj, owner):
-        if obj is None:
-            return self
-        try:
-            return managed_attributes[obj]
-        except KeyError:
-            raise AttributeError()
\ No newline at end of file
diff --git a/test/attributes.py b/test/attributes.py
index bff864fa69..126f504564 100644
--- a/test/attributes.py
+++ b/test/attributes.py
@@ -45,7 +45,8 @@ class AttributesTest(PersistTest):
         manager.register_attribute(MyTest, 'email_address', uselist = False)
         x = MyTest()
         x.user_id=7
-        pickle.dumps(x)
+        s = pickle.dumps(x)
+        y = pickle.loads(s)
 
     def testlist(self):
         class User(object):pass
diff --git a/test/masscreate2.py b/test/masscreate2.py
new file mode 100644
index 0000000000..f261f832ce
--- /dev/null
+++ b/test/masscreate2.py
@@ -0,0 +1,36 @@
+import gc
+
+import random, string
+
+from sqlalchemy.attributes import *
+
+# with this test, run top.  make sure the Python process doenst grow in size arbitrarily.
+
+class User(object):
+    pass
+        
+class Address(object):
+    pass
+
+attr_manager = AttributeManager()
+attr_manager.register_attribute(User, 'id', uselist=False)
+attr_manager.register_attribute(User, 'name', uselist=False)
+attr_manager.register_attribute(User, 'addresses', uselist=True)
+attr_manager.register_attribute(Address, 'email', uselist=False)
+attr_manager.register_attribute(Address, 'user', uselist=False)
+        
+
+for i in xrange(1000):
+  for j in xrange(1000):
+    u = User()
+    u.name = str(random.randint(0, 100000000))
+    for k in xrange(10):
+      a = Address()
+      a.email_address = str(random.randint(0, 100000000))
+      u.addresses.append(a)
+      a.user = u
+  print "clearing"
+  #managed_attributes.clear()
+  gc.collect()
+  
+  
diff --git a/test/massload.py b/test/massload.py
index 43309467ab..ab47415e8a 100644
--- a/test/massload.py
+++ b/test/massload.py
@@ -56,7 +56,7 @@ class LoadTest(AssertMixin):
                 a.value = 'changed...'
             assert len(objectstore.get_session().dirty) == len(l)
             assert len(objectstore.get_session().identity_map) == len(l)
-            assert len(attributes.managed_attributes) == len(l)
+            #assert len(attributes.managed_attributes) == len(l)
             print len(objectstore.get_session().dirty)
             print len(objectstore.get_session().identity_map)
             objectstore.expunge(*l)
-- 
2.47.2