Methods, systems and apparatus for client extensibility during provisioning of a composite blueprint

A method comprising:

• evaluating, by executing an instruction using a processor, for each subscriber to an event broker having at least one event topic subscription through the event broker, a received trigger associated with an event involved in provisioning of a virtual computing resource according to a blueprint, to identify a first subscriber to a first event topic associated with the event, the event including a payload associated with the provisioning of the virtual computing resource;
• determining, by executing an instruction using the processor, whether the first subscriber is a non-blocking subscriber or a blocking subscriber;
• facilitating, by executing an instruction using the processor, notification of the blocking subscriber regarding the event prior to completion of the provisioning of the virtual computing resource, wherein the notification includes facilitating pausing of the provisioning of the virtual computing resource for modification of the payload for the event by the blocking subscriber but not by the non-blocking subscriber, the modified payload to affect the provisioning of the virtual computing resource;
• and
• notifying the non-blocking subscriber regarding the event with the modified payload while the virtual computing resource is provisioned.

A non-transitory computer readable storage medium comprising computer readable instructions that, when executed, cause at least one processor to at least:

• evaluate, for each subscriber to an event broker having at least one event topic subscription through the event broker, a received trigger associated with an event involved in provisioning of a virtual computing resource according to a blueprint, to identify a first subscriber to a first event topic associated with the event, the event including a payload associated with the provisioning of the virtual computing resource;
• determine whether the first subscriber is a non-blocking subscriber or a blocking subscriber;
• facilitate notification of the blocking subscriber regarding the event prior to completion of the provisioning of the virtual computing resource, wherein the notification includes facilitating pausing of the provisioning of the virtual computing resource for modification of the payload for the event by the blocking subscriber but not by the non-blocking subscriber, the modified payload to affect the provisioning of the virtual computing resource;
• and
• notify the non-blocking subscriber regarding the event with the modified payload while the virtual computing resource is provisioned.