Blocking tasks and notifications allow a system administrator to configure vCloud Director to send AMQP messages triggered by certain events.
Some of these messages are simply notifications that the event has occurred. These are known as notifications. Others publish information to a designated AMQP endpoint indicating that a requested action has been blocked pending action by a client program bound to that endpoint, and are known as blocking tasks.
A system administrator can configure a system-wide set of blocking tasks that are subject to programmatic action by an AMQP client.