Instantiate callback plugins only once so we can set play/task objects on them and they'll stick.

plugins/callbacks/context_demo.py

@@ -0,0 +1,31 @@
+# (C) 2012, Michael DeHaan, <michael.dehaan@gmail.com>
+
+# This file is part of Ansible
+#
+# Ansible is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Ansible is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
+
+import os
+import time
+import json
+
+class CallbackModule(object):
+    """
+    This is a very trivial example of how any callback function can get at play and task objects.
+    play will be 'None' for runner invocations, and task will be None for 'setup' invocations.
+    """
+
+    def on_any(self, *args, **kwargs):
+        play = getattr(self, 'play', None)
+        task = getattr(self, 'task', None)
+        print "play = %s, task = %s, args = %s, kwargs = %s" % (play,task,args,kwargs)