7. Orchestration and Extension : 7.3 vCloud Messages : 7.3.4 Design Considerations
7.3.4 Design Considerations
The following applies for notifications and blocking tasks:
*Notifications and blocking tasks are separate mechanisms that are implemented over the same AMQP message bus.
*When a task is blocked, an extension is responsible for delivering a message to query the status of the related object or take action on the blocked task.
*Resume, Progress (that was made), Abort, and Continue are valid calls against a blocking task.
*Configure the timeout for a blocking task globally in vCloud Director.
*You can abort a waiting blocking task directly from the VMware vCloud Director UI.