Added printing requirements

zope/event/__init__.py

@@ -0,0 +1,31 @@
+##############################################################################
+#
+# Copyright (c) 2004 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.
+#
+##############################################################################
+""" Base event system implementation
+
+"""
+
+#: Applications may register for notification of events by appending a
+#: callable to the ``subscribers`` list.
+#: 
+#: Each subscriber takes a single argument, which is the event object
+#: being published.
+#:
+#: Exceptions raised by subscribers will be propagated.
+subscribers = []
+
+def notify(event):
+    """ Notify all subscribers of ``event``.
+    """
+    for subscriber in subscribers:
+        subscriber(event)