Methods and apparatus for adaptive workflow adjustment during resource provisioning using meta-topics

1. An event broker apparatus, the event broker apparatus comprising:

memory; and

at least one processor to implement:

a subscription manager to manage subscriptions to event topics associated with provisioning of a virtual computing resource;

a meta-topic subscriber to identify a subscription request by a service for an event topic and to trigger, in response to the subscription request, a meta-topic subscription to indicate a) a subscriber to the event topic and b) a type of the subscriber, the type to include at least a blocking subscriber; and

a topic monitor to monitor for an event corresponding to the event topic to determine, upon occurrence of the event, whether to i) trigger execution of a blocking subscriber workflow when the meta-topic subscription indicates that the type of the subscriber is a blocking subscriber or ii) bypass the blocking subscriber workflow when the type of the subscriber is not a blocking subscriber.

2. The apparatus of claim 1 , wherein the blocking subscriber workflow is to trigger a notification of the subscriber regarding the event associated with the event topic and to facilitate modification of the event by the subscriber.

3. The apparatus of claim 2 , wherein the type is to include a non-blocking subscriber, and wherein the topic monitor is to trigger a non-blocking subscriber workflow to notify a non-blocking subscriber of the event.

4. The apparatus of claim 3 , wherein the blocking subscriber workflow is to execute before the non-blocking subscriber workflow when both a blocking subscriber and a non-blocking subscriber are associated with the meta-topic subscription.

5. The apparatus of claim 1 , further including an orchestrator to facilitate provisioning of a virtual computing resource based on a blueprint, the provisioning associated with an event defined by the blueprint.

6. The apparatus of claim 5 , wherein the blueprint is to define an infrastructure as a service to be provisioned as one or more virtual computing resources.

7. The apparatus of claim 1 , wherein the meta-topic subscriber is to modify the meta-topic subscription to remove the subscriber in response to an unsubscribe message.

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

identify a subscription request by a service for an event topic and to trigger, in response to the subscription request, a meta-topic subscription to indicate a) a subscriber to the event topic and b) a type of the subscriber, the type to include at least a blocking subscriber;

monitor for an event corresponding to the event topic;

determine, upon occurrence of the event, whether the meta-topic subscription indicates that the type of the subscriber is a blocking subscriber;

trigger, when the type of the subscriber is a blocking subscriber, execution of a blocking subscriber workflow; and

bypass, when the type of the subscriber is not a blocking subscriber, the blocking subscriber workflow.

9. The storage medium of claim 8 , wherein the blocking subscriber workflow is to trigger a notification of the subscriber regarding the event associated with the event topic and to facilitate modification of the event by the subscriber.

10. The storage medium of claim 9 , wherein the type is to include a non-blocking subscriber, and wherein the instructions, when executed, cause the at least one processor to trigger a non-blocking subscriber workflow to notify a non-blocking subscriber of the event.

11. The storage medium of claim 10 , wherein the blocking subscriber workflow is to execute before the non-blocking subscriber workflow when both a blocking subscriber and a non-blocking subscriber are associated with the meta-topic subscription.

12. The storage medium of claim 8 , wherein the instructions, when executed, cause the at least one processor to at least facilitate provisioning of a virtual computing resource based on a blueprint, the provisioning associated with an event defined by the blueprint.

13. The storage medium of claim 12 , wherein the blueprint is to define an infrastructure as a service to be provisioned as one or more virtual computing resources.

14. The storage medium of claim 8 , wherein the instructions, when executed, cause the at least one processor to at least modify the meta-topic subscription to remove the subscriber in response to an unsubscribe message.

15. A method comprising:

identifying, by executing an instruction using at least one processor, a subscription request by a service for an event topic and to trigger, in response to the subscription request, a meta-topic subscription to indicate a) a subscriber to the event topic and b) a type of the subscriber, the type to include at least a blocking subscriber;

monitoring, by executing an instruction using at least one processor, for an event corresponding to the event topic;

upon occurrence of the event, determining, by executing an instruction using at least one processor, whether the meta-topic subscription indicates that the type of the subscriber is a blocking subscriber;

triggering, by executing an instruction using at least one processor when the type of the subscriber is a blocking subscriber, execution of a blocking subscriber workflow; and

bypassing, by executing an instruction using at least one processor when the type of the subscriber is not a blocking subscriber, the blocking subscriber workflow.

16. The method of claim 15 , wherein the blocking subscriber workflow is to trigger a notification of the subscriber regarding the event associated with the event topic and to facilitate modification of the event by the subscriber.

17. The method of claim 16 , wherein the type is to include a non-blocking subscriber, and wherein the method further includes triggering a non-blocking subscriber workflow to notify a non-blocking subscriber of the event.

18. The method of claim 17 , wherein the blocking subscriber workflow is to execute before the non-blocking subscriber workflow when both a blocking subscriber and a non-blocking subscriber are associated with the meta-topic subscription.

19. The method of claim 15 , further including facilitating provisioning of a virtual computing resource based on a blueprint, the provisioning associated with an event defined by the blueprint.

20. The method of claim 19 , wherein the blueprint is to define an infrastructure as a service to be provisioned as one or more virtual computing resources.

21. The method of claim 15 , further including modifying the meta-topic subscription to remove the subscriber in response to an unsubscribe message.