Oops, forgot to check these in when removing the dependency on zope.event

src/ZODB/event.py

+##############################################################################
+#
+# Copyright Zope Foundation 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.
+#
+##############################################################################
+
+def _noop(event):
+    """
+    Tests:
+
+    >>> import sys, ZODB.event
+    >>> notify = ZODB.event
+    >>> zopemod = sys.modules.get('zope', False)
+    >>> event = sys.modules.get('zope.event', False)
+    >>> if event:
+    ...    del zopemod.event
+    ...    sys.modules['zope.event'] = None
+    ...    _ = reload(ZODB.event)
+
+    If zope.event isn't installed, then notify is _noop
+
+    >>> ZODB.event.notify is ZODB.event._noop
+    True
+
+    If zope.event is installed, then notify is zope.event.notify:
+
+    >>> zope = sys.modules['zope'] = type(sys)('zope')
+    >>> zope.event = sys.modules['zope.event'] = type(sys)('zope.event')
+    >>> zope.event.notify = lambda e: None
+    >>> _ = reload(ZODB.event)
+    >>> ZODB.event.notify is zope.event.notify
+    True
+
+    Cleanup:
+
+    >>> if event is False:
+    ...     del sys.modules['zope.event']
+    ... else:
+    ...     if event:
+    ...         zopemod.event = event
+    ...     sys.modules['zope.event'] = event
+
+    >>> if zopemod is False:
+    ...     del sys.modules['zope']
+    ... else:
+    ...     sys.modules['zope'] = zopemod
+
+    >>> ZODB.event.notify = notify
+
+    """
+    pass
+
+try:
+    from zope.event import notify
+except ImportError:
+    notify = _noop
+

src/ZODB/event.txt

+Event support
+
+Sometimes, you want to react when ZODB does certain things.  In the
+past, ZODB provided ad hoc hook functions for this. Going forward,
+ZODB will use an event mechanism.  ZODB.event.notify is called with
+events of interest.
+
+If zope.event is installed, then ZODB.event.notify is simply an alias
+for zope.event.  If zope.event isn't installed, then ZODB.event is a
+noop.