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+
+==============================
+Notification Dispatcher Filter
+==============================
+
+https://blueprints.launchpad.net/oslo?searchtext=notification-dispatcher-filter
+
+Oslo.messaging lacks the ability to filter out notifications it sends to
+endpoints. This spec proposes to enable filtering process before messages are
+dispatched to endpoints.
+
+Problem description
+===================
+
+Currently, oslo.messaging blindly dispatches notifications to all registered
+endpoints. It is after the endpoints receive the messages are we able to filter
+and decide whether the endpoint should process the notifications. This decision
+can be made earlier before it dispatches messages to the endpoints to avoid
+the overhead of sending messages to endpoints which will ignore them.
+
+For example, in Ceilometer, multiple endpoints are connected to the
+notification listener. Each endpoint may only process a subset of the
+notifications that are picked up. It is at the endpoint level where we
+currently filter whether to continue processing the notification but this
+filtering can easily be done before it's even dispatched to the endpoint.
+
+
+Proposed change
+===============
+
+The proposed solution is to add a NotificationFilter to the dispatcher. When
+oslo.messaging dispatches messages to the endpoints, it will first pass through
+the filter and check if the messages fits the criteria defined in filter.
+Messages can be filtered using regex against all first level attributes of a
+message: context, publisher_id, event_type, metadata, and payload. As context,
+metadata, and payload are dictionary values, multiple contraints can be
+defined for them.
+
+An example filter is as follows:
+
+.. code-block:: python
+
+  filter =  NotificationFilter(
+      publisher_id='^compute.*',
+      context={'tenant_id': '^5f643cfc-664b-4c69-8000-ce2ed7b08216$',
+               'roles': 'private'},
+      event_type='^compute\.instance\..*',
+      metadata={'timestamp': 'Aug'}.
+      payload={'state': '^active$'})
+
+Alternatives
+------------
+
+We continue to filter at the endpoint level.
+
+Impact on Existing APIs
+-----------------------
+
+None.
+
+Security impact
+---------------
+
+None.
+
+Performance Impact
+------------------
+
+None, but it does offer potential to reduce load dispatched.
+
+Configuration Impact
+--------------------
+
+None.
+
+Developer Impact
+----------------
+
+Developers nowi have ability to add a filter when they defined Endpoints.
+
+.. code-block:: python
+
+  class NotificationEndpoint(object):
+      filter = NotificationFilter(publisher_id='^compute.*')
+
+
+Testing Impact
+--------------
+
+Unit tests are sufficient as the functionality is limited to dispatcher.
+Indirectly, when implemented in Ceilometer, this will be tested via tempest.
+
+Implementation
+==============
+
+Assignee(s)
+-----------
+
+Primary assignee:
+  sileht 
+
+Other contributors:
+  gordc
+
+Milestones
+----------
+
+Target Milestone for completion: kilo-1
+
+Work Items
+----------
+
+- Add filter to dispatcher with unit tests
+- change filters in Ceilometer to use new filters.
+
+Incubation
+==========
+
+None.
+
+Adoption
+--------
+
+Ceilometer but it seems like common functionality that other listeners
+would use.
+
+Library
+-------
+
+oslo.messaging.
+
+Anticipated API Stabilization
+-----------------------------
+
+None.
+
+Documentation Impact
+====================
+
+None.
+
+Dependencies
+============
+
+None.
+
+References
+==========
+
+code review: http://review.openstack.org/#/c/77886/
+
+
+.. note::
+
+  This work is licensed under a Creative Commons Attribution 3.0
+  Unported License.
+  http://creativecommons.org/licenses/by/3.0/legalcode
+