Platform Events Developer Guide

Delivering Custom Notifications with Platform Events
Defining Your Platform Event
Publishing Platform Events
Subscribing to Platform Events
Considerations and Testing
Defining Platform Events
Processes and Flows
Apex and API
Test Your Platform Event Trigger in Apex
What Is the Difference Between the Salesforce Events?
End-to-End Example Using a Process and a Flow
Reference
PDF

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Considerations for Subscribing to Platform Events with Processes and Flows

Before you use processes or flows to subscribe to platform events, familiarize yourself with these considerations.
Infinite Loops and Limits
Be careful when publishing events from processes or flows because you can get into an infinite loop and exceed limits. For example, a process is associated with the Printer Status platform event. The same process includes an action that creates a Printer Status event notification. The process would trigger itself.

To avoid creating an endless loop in an event process, make sure that the new event message’s field values don’t meet the filter criteria for the associated criteria node.

Subscriptions Related List
On the platform event’s detail page, the Subscriptions related list shows which entities are waiting for notifications of that platform event to occur. One “Process” subscriber appears in the Subscriptions related list when:
  • At least one active event process is associated with that platform event
  • At least one flow interview is waiting for that platform event to occur
Uninstalling Events
Before you uninstall a package that includes a platform event:
  • Delete interviews that are waiting for the event to occur
  • Deactivate processes that reference the event
Testing Events
Event processes or Wait elements subscribed to platform events don't support Apex tests.

Event Processes

These considerations apply only to event processes.

Formulas
Formulas in Process Builder don’t support platform event fields.
Post to Chatter Actions
You can’t include event references in Chatter post messages.
Scheduled Process Actions
Scheduled actions aren’t supported in event processes.
Packaging Event Processes
When you package an event process, the associated object isn’t included automatically. Advise your subscribers to create the object, or manually add the object to your package.

Resumed Flow Interviews

These considerations apply only to flow interviews that resume when a platform event occurs.

Formulas
To reference a platform event field in a flow, pass the event data into an sObject variable in the Wait element. Then reference the appropriate field in that sObject variable.
Event Condition Values
In flow event conditions, values can’t be more than 765 characters.