Platform Events Developer Guide

Platform Events Developer Guide
Delivering Custom Notifications with Platform Events
Defining Your Custom Platform Event
Publishing Platform Events
Flows
Processes
Apex
Apex Publish Callbacks
Apex Publish Callback Class
Callback Running User and Debug Logs
Create an Event with an EventUuid Field
Invoke the Publish Callback
Publish Callback Best Practices
Example: Publish Callback Class That Creates Follow-Up Tasks for Failed Publishes
Example: Publish Events with a Callback Instance
Example: Publish Callback Class That Creates Follow-Up Tasks for Failed and Successful Publishes
Example: Publish Callback Class That Correlates Callback Results with Event Messages
Test Apex Publish Callbacks
Apex Publish Callback Limits
Salesforce APIs
Pub/Sub API
Subscribing to Platform Events
Testing Your Platform Event in Apex
Encrypting Platform Event Messages at Rest in the Event Bus
Monitor Platform Event Publishing and Delivery Usage
Considerations
Examples
Reference
PDF

Create an Event with an EventUuid Field

The EventUuid field uniquely identifies an event message and is used to match the events returned in the callback result with the events in the publish call. To have the system generate an EventUuid field value in each event object, use the SObjectType.newSObject(recordTypeId, loadDefaults) Apex method to create the event object. 
1Order_Event__e event = (Order_Event__e)Order_Event__e.sObjectType.newSObject(null, true);
2
3// The EventUuid value is returned after object creation
4System.debug('EventUuid: ' + event.EventUuid);
5
6// Debug output
7// EventUuid: 19bd382e-8964-43de-ac01-d5d82dd0bf78

If you aren’t interested in correlating the events in the publish call with the publish results, you don’t need the EventUuid value in the created event. In this case, you can create the event by using the event API name directly, which doesn’t include the EventUuid value in the event object. For example: Order_Event__e event = new Order_Event__e();.

Note