Enable the read-only transaction cache temporarily when checking category...

Enable the read-only transaction cache temporarily when checking category membership, because this is guaranteed not to change categories. This change improves the performance significantly when there are many membership criterion categories.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@15573 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/Predicate.py

@@ -37,6 +37,7 @@ from Products.ERP5Type.Core.Folder import Folder
 from Products.ERP5Type.Document import newTempBase
 from Products.ERP5Type.XMLObject import XMLObject
 from Products.ERP5Type.Utils import convertToUpperCase
+from Products.ERP5Type.Cache import getReadOnlyTransactionCache, enableReadOnlyTransactionCache, disableReadOnlyTransactionCache
 
 from zLOG import LOG
 
@@ -132,6 +133,14 @@ class Predicate(XMLObject, Folder):
           membership_criterion_category_list if x.split('/', 1)[0] in \
           tested_base_category_list]
 
+    # Test category memberships. Enable the read-only transaction cache
+    # temporarily, if not enabled, because this part is strictly read-only,
+    # and context.isMemberOf is very expensive, when the category list has
+    # many items.
+    enabled = (getReadOnlyTransactionCache(self) is not None)
+    try:
+      if not enabled:
+        enableReadOnlyTransactionCache(self)
       for c in membership_criterion_category_list:
         bc = c.split('/', 1)[0]
         if (bc not in tested_base_category) and \
@@ -149,6 +158,9 @@ class Predicate(XMLObject, Folder):
         elif (bc in membership_criterion_base_category_list):
           tested_base_category[bc] = tested_base_category[bc] or \
                                      context.isMemberOf(c)
+    finally:
+      if not enabled:
+        disableReadOnlyTransactionCache(self)
 
 #        LOG('predicate test', 0,
 #            '%s after single membership to %s' % \