Added a database removeVersionPool method to remove a version pool.

src/ZODB/DB.py

@@ -13,8 +13,8 @@
 ##############################################################################
 """Database objects
 
-$Id: DB.py,v 1.50 2003/04/23 20:05:51 jeremy Exp $"""
-__version__='$Revision: 1.50 $'[11:-2]
+$Id: DB.py,v 1.51 2003/06/24 21:29:54 jim Exp $"""
+__version__='$Revision: 1.51 $'[11:-2]
 
 import cPickle, cStringIO, sys, POSException, UndoLogCompatible
 from Connection import Connection
@@ -136,12 +136,23 @@ class DB(UndoLogCompatible.UndoLogCompatible):
                 am.closedConnection(connection)
             version=connection._version
             pools,pooll=self._pools
-            pool, allocated, pool_lock = pools[version]
+            try:
+                pool, allocated, pool_lock = pools[version]
+            except KeyError:
+                # No such version. We must have deleted the pool.
+                # Just let the connection go.
+
+                # We need to break circular refs to make it really go:
+                connection.__dict__.clear()
+                
+                return
+                
             pool.append(connection)
             if len(pool)==1:
                 # Pool now usable again, unlock it.
                 pool_lock.release()
-        finally: self._r()
+        finally:
+            self._r()
 
     def _connectionMap(self, f):
         self._a()
@@ -384,7 +395,7 @@ class DB(UndoLogCompatible.UndoLogCompatible):
                 return c
 
 
-            pools,pooll=self._pools
+            pools, pooll = self._pools
 
             # pools is a mapping object:
             #
@@ -473,6 +484,19 @@ class DB(UndoLogCompatible.UndoLogCompatible):
 
         finally: self._r()
 
+    def removeVersionPool(self, version):
+        pools, pooll = self._pools
+        info = pools.get(version)
+        if info:
+            del pools[version]
+            pool, allocated, pool_lock = info
+            pooll.remove((pool, allocated))
+            try: pool_lock.release()
+            except: pass
+            del pool[:]
+            del allocated[:]
+            6
+
     def connectionDebugInfo(self):
         r=[]
         pools,pooll=self._pools

src/ZODB/tests/testDB.py

@@ -11,22 +11,27 @@
 # FOR A PARTICULAR PURPOSE.
 # 
 ##############################################################################
+import os
 import time
 import unittest
 
 import ZODB
-import ZODB.MappingStorage
+import ZODB.FileStorage
 
 from ZODB.tests.MinPO import MinPO
 
 class DBTests(unittest.TestCase):
 
     def setUp(self):
-        store = ZODB.MappingStorage.MappingStorage()
+        self.__path = os.path.abspath('test.fs')
+        store = ZODB.FileStorage.FileStorage(self.__path)
         self.db = ZODB.DB(store)
 
     def tearDown(self):
         self.db.close()
+        for s in ('', '.index', '.lock', '.tmp'):
+            if os.path.exists(self.__path+s):
+                os.remove(self.__path+s)
 
     def dowork(self, version=''):
         c = self.db.open(version)
@@ -37,7 +42,6 @@ class DBTests(unittest.TestCase):
             o.value = MinPO(i)
             get_transaction().commit()
             o = o.value
-        print r.items()
         c.close()
 
     # make sure the basic methods are callable
@@ -49,5 +53,78 @@ class DBTests(unittest.TestCase):
         self.db.setVersionCacheDeactivateAfter(12) # deprecated
         self.db.setVersionCacheSize(15)
 
+    def test_removeVersionPool(self):
+        # Test that we can remove a version pool
+
+        # This is white box because we check some internal data structures
+        
+        self.dowork()
+        self.dowork('v2')
+        c1 = self.db.open('v1')
+        c1.close() # return to pool
+        c12 = self.db.open('v1')
+        c12.close() # return to pool
+        self.assert_(c1 is c12) # should be same 
+
+        pools, pooll = self.db._pools
+
+        self.assertEqual(len(pools), 3)
+        self.assertEqual(len(pooll), 3)
+
+        self.db.removeVersionPool('v1')
+
+        self.assertEqual(len(pools), 2)
+        self.assertEqual(len(pooll), 2)
+
+        c12 = self.db.open('v1')
+        c12.close() # return to pool
+        self.assert_(c1 is not c12) # should be different 
+
+        self.assertEqual(len(pools), 3)
+        self.assertEqual(len(pooll), 3)
+
+    def _test_for_leak(self):
+        self.dowork()
+        self.dowork('v2')
+        while 1:
+            c1 = self.db.open('v1')
+            self.db.removeVersionPool('v1')
+            c1.close() # return to pool
+
+    def test_removeVersionPool_while_connection_open(self):
+        # Test that we can remove a version pool
+
+        # This is white box because we check some internal data structures
+        
+        self.dowork()
+        self.dowork('v2')
+        c1 = self.db.open('v1')
+        c1.close() # return to pool
+        c12 = self.db.open('v1')
+        self.assert_(c1 is c12) # should be same 
+
+        pools, pooll = self.db._pools
+
+        self.assertEqual(len(pools), 3)
+        self.assertEqual(len(pooll), 3)
+
+        self.db.removeVersionPool('v1')
+
+        self.assertEqual(len(pools), 2)
+        self.assertEqual(len(pooll), 2)
+
+        c12.close() # should leave pools alone
+
+        self.assertEqual(len(pools), 2)
+        self.assertEqual(len(pooll), 2)
+
+        c12 = self.db.open('v1')
+        c12.close() # return to pool
+        self.assert_(c1 is not c12) # should be different 
+
+        self.assertEqual(len(pools), 3)
+        self.assertEqual(len(pooll), 3)
+
+
 def test_suite():
     return unittest.makeSuite(DBTests)