Platform Events Developer Guide

Platform Events Developer Guide
Delivering Custom Notifications with Platform Events
Defining Your Custom Platform Event
Publishing Platform Events
Subscribing to Platform Events
Set Up Debug Logs
Flows
Processes
Apex Triggers
Apex Trigger Best Practices
Platform Event Processing at Scale with Parallel Subscriptions for Apex Triggers
Order of Events in Parallel Subscriptions
Choosing a Partition Key
Parallel Subscription Limits
Parallel Subscription Configuration Examples in Tooling API and Metadata API
Apex Trigger Repartitioning
Configure Parallel Subscriptions for an Apex Trigger
Testing an Apex Trigger Configured with Parallel Subscriptions
Parallel Subscriptions Considerations
Configure the User and Batch Size for Your Platform Event Trigger with PlatformEventSubscriberConfig
Find Uncaught Exceptions in Event Log Files
Resume a Platform Event Trigger After an Uncaught Exception
Retry Event Triggers with EventBus.RetryableException
Email Notifications for Triggers in Error State
Comparing setResumeCheckpoint() and and EventBus.RetryableException
Lightning Components
Pub/Sub API
CometD
Group Your Event Streams
Filter Your Event Streams
Obtain a Platform Event’s Subscribers
Identify and Match Event Messages with the EventUuid Field
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

Note: This release is in preview. Features described here don’t become generally available until the latest general availability date that Salesforce announces for this release. Before then, and where features are noted as beta, pilot, or developer preview, we can’t guarantee general availability within any particular time frame or at all. Make your purchase decisions only on the basis of generally available products and features.

Testing an Apex Trigger Configured with Parallel Subscriptions

You can test an Apex platform event trigger that’s configured with parallel subscriptions the same way that you test a regular Apex platform event trigger.

See Testing Your Platform Event in Apex.

To verify that a trigger is configured for parallel subscriptions, run a query on EventBusSubscriber and select the IsPartitioned field. A value of true means that the trigger uses parallel subscriptions.

This example shows a sample query that gets all Apex trigger subscribers that are subscribed to the Order_Event__e platform event. The IsPartitioned field is one of the fields returned.

1SELECT ExternalId, Name, Position, Status, IsPartitioned FROM EventBusSubscriber 
2WHERE Topic='Order_Event__e' AND Type='ApexTrigger'

Sample query result:

ExternalID
01qZ70000008PWi
Name
MyOrderEventTrigger
Position
179
Status
Running
IsPartitioned
true

See EventBusSubscriber in the Object Reference for the Salesforce Platform.