Renat, On sending events to an "exchange", I mean an exchange on the transport (i.e. rabbitMQ exchange https://www.rabbitmq.com/tutorials/amqp-concepts.html). On implementation we can probably explore the notification feature in oslo.messaging. But on second thought, this would limit the consumers to trusted subsystems or services though. If we want the event consumers to be any 3rd party, including untrusted, then maybe we should keep it as HTTP calls. Winson -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.openstack.org/pipermail/openstack-dev/attachments/20141208/deead010/attachment.html>