8. vCloud Integration Examples : 8.3 AMQP Blocking Tasks : 8.3.1 Background
8.3.1 Background
vCloud Director uses a message bus architecture to communicate vCloud Director events with third-party systems or services. Events fall into two classes, non-blocking and blocking. In the case of blocking events, vCloud Director publishes messages to the configured exchange queue for the tasks that are configured as blocking tasks. Blocking tasks halt the generating task and the task waits for acknowledgement that it is allowed to continue.