7.1

Table Of Contents
Table 42. Workflow Subscription and Event Broker Terminology (Continued)
Term Description
Subscriber Consumes the events published to the event broker service
based on the subscription definition. The subscriber might also
be referred to as the consumer.
Provider Registers event topics in the event broker service.
Producer Publishes events to the event broker service.
System Administrator A user with privileges to create, read, update, and delete tenant
workflow subscriptions and system workflow subscriptions using
the API or vRealize Automation plug-in. vRealize Automation
does not include a user interface for the system administrator.
Tenant Administrator The user with privileges to create, read, update, and delete
tenant workflow subscriptions for their tenant.
Workflow Subscription Specifies the event topic and conditions that trigger a
vRealize Orchestrator workflow.
System Workflow Subscription A specialized workflow subscription that reacts to system events
and to events in all the tenants.
Tenant Workflow Subscription A specialized workflow subscription that specifies which
conditions trigger a vRealize Orchestrator workflow for events in
the same tenant.
Blockable and Replyable Event Topics
Event topics might support blockable and replyable events. The behavior of a workflow subscription
depends on whether the topic supports these event types and how you configure the workflow
subscription.
Non-Blockable Event Topics
Non-blockable event topics only allow you to create non-blocking subscriptions. Non-blocking
subscriptions are triggered asynchronously and you can not rely on the order that the subscriptions are
triggered or that the vRealize Orchestrator workflows run. Non-blocking subscriptions only return a
response if the topic is replyable.
Blockable Event Topics
Some event topics support blocking. If a workflow subscription is marked as blocking, then all messages
that meet the configured conditions are not received by any other workflow subscriptions with matching
conditions until the first workflow is finished. If you have multiple blocking workflow subscriptions for the
same event topic, you prioritize the subscriptions.
Life Cycle Extensibility
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