Event notification system
- consume events to register from a task queue
- store and forward for all users by email
- filter events to send by user, origin, priority, content
- send SMS messages
- notification acknowledge
- scaling up notification on failure to deliver, non acknowledge or non resolution
- http://www.opennms.org/wiki/Tutorial_Notifications
- http://www.eurekastreams.org/Technical-Specification/1.0/Notification%20framework.html
- https://cwiki.apache.org/confluence/display/CLOUDSTACK/Event+Notification+Framework+Proposal
- http://pdf.aminer.org/000/345/373/a_comparative_study_of_web_services_based_event_notification_specifications.pdf