1. A method of providing publish-subscribe communications, the method comprising: receiving, using a processing device, an event published by an event publisher, the event publisher being associated with a first domain; assigning, using the processing device, a priority by an event broker to a plurality of event subscribers associated with a second domain; processing, using the processing device, the event by the event broker based on a rule and the priority; and providing, using the processing device, the event to the plurality of event subscribers in accordance with the priority.