[Checkins] SVN: zope.component/branches/jinty-optional-event/src/zope/component/event.py Provide optional implementation of zope.event as a starting point.

[Brian Sutherland]

Log message for revision 109650:
  Provide optional implementation of zope.event as a starting point.

Changed:
  U   zope.component/branches/jinty-optional-event/src/zope/component/event.py

-=-
Modified: zope.component/branches/jinty-optional-event/src/zope/component/event.py
===================================================================
--- zope.component/branches/jinty-optional-event/src/zope/component/event.py	2010-03-04 15:37:24 UTC (rev 109649)
+++ zope.component/branches/jinty-optional-event/src/zope/component/event.py	2010-03-04 15:41:36 UTC (rev 109650)
@@ -19,13 +19,22 @@
 __docformat__ = 'restructuredtext'
 
 import zope.component.interfaces
-import zope.event
 
+try:
+    # use zope.event if it's around
+    from zope.event import subscribers, notify
+except ImportError:
+    # if not, provide our own implementation
+    subscribers = []
 
+    def notify(event):
+        for subscriber in subscribers:
+            subscriber(event)
+
 def dispatch(*event):
     zope.component.subscribers(event, None)
 
-zope.event.subscribers.append(dispatch)
+subscribers.append(dispatch)
 
 
 @zope.component.adapter(zope.component.interfaces.IObjectEvent)