By Pranay Jha
| Jan 4, 2018 | In
Articles
| Update: Jan 4, 2018
| Total Views [ 5391 ]
vRealie Automation 7 extensibility though vRealize Orchestrator using Event Broker Service (EBS)
Blocking vs. Non-Blocking Subscriptions:
Subscriptions can monitor or control the underlying workflow:
- Nonblocking subscriptions allow the workflow to complete without interruption.
- Blocking subscriptions pause workflows to wait for sbscriber input.
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Blocking
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Non-Blocking
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Workflow fails
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Request fails
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Request succeeds
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Workflow return values
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Returns are processed
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Returns are discarded
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Parallelism
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Workflows run in sequence per request
Workflows run in parallel for multiple requests
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Workflows run in parallel
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Use
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To manipulate and edit stuff during events
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To fire and forget tasks
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The default subscription is nonblocking. Events are delivered asynchronously to subscribers and have no derect impact to the workflow. When a workflow posts an event that triggers the subscription, the workflow continues to run and doesn't monitor whether the event was picked up.
A blocking subscription is different in that it pauses the workflow until the events that trigger a subscription are processed by the subscriber. The subscriber can send feedback to the workflow by changing variables or issuing exceptions.
It is important to know that when you are creating a new subscription, always start with a blocking subscription and limit the events that subscription triggers on to a single blueprint. This practice makes troubleshooting the subscription much easier and prevents the subscription from interfering with normal operatations.
Thank you for visiting my profile. I am Pranay Jha, bring along a total of 11+ years of extensive experience with me in Information Technology sector for organizations from small business to large enterprises, wherein my current assignment I am associated with IBM as a Technical Solution Architect for Virtualization platform. I am vExpert x 3 (16/17/18), VCIX-DCV, VCAP5/6-DCD, VCAP5-DCA, VCP7-CMA, VCP5/6-DCV, VCA-DCV, VCA-Cloud, VSP, VCE-CIA, MCITP, MCSE, MCSA(Messaging). I am also an Independent blogger and founder of http://vmwareinsight.com and https://cloudpathshala.com. I can be reached via email at pranay1988jha@gmail.com or Direct Message via Contact Us form.
