Apex, API, and SOQL Considerations for Platform Events

Be familiar with the considerations when publishing and subscribing to platform events.

Only after insert Triggers Are Supported

Only after insert triggers are supported for platform events because event notifications can’t be updated. They’re only inserted (published).

Infinite Trigger Loop and Limits

Be careful when publishing events from triggers because you could get into an infinite trigger loop and exceed limits. For example, if you publish an event from a trigger that’s associated with the same event object, the trigger is fired in an infinite loop.

Apex DML Limits for Publishing Events

Each EventBus.publish method call is considered a DML statement, and DML limits apply.

Platform Event Triggers: ownerId Fields of New Records

In platform event triggers, if you create a Salesforce record that contains an ownerId field, set the ownerId field explicitly to the appropriate user. Platform event triggers run under the Automated Process entity. If you don’t set the ownerId field on records that contain this field, the system sets the default value of Automated Process. This example explicitly populates the ownerId field for an opportunity with an ID obtained from another record.

1Opportunity newOpp = new Opportunity(
2    OwnerId = customerOrder.createdById,
3    AccountId = acc.Id, 
4    StageName = 'Qualification', 
5    Name = 'A ' + customerOrder.Product_Name__c + ' opportunity for ' + acc.name, 
6    CloseDate = Date.today().addDays(7));

For cases and leads, you can alternatively use assignment rules for setting the owner. See AssignmentRuleHeader for the SOAP API or Setting DML Options for Apex.

API Request Limits for Publishing Events

Because platform events are published by inserting the event sObjects, API request limits apply. For more information, see API Request Limits in the Salesforce Limits Quick Reference Guide.

Replaying Past Events

You can replay platform events that were sent in the past 24 hours. You can replay platform events through the API but not Apex. The process of replaying platform events is the same as for other Streaming API events. For more information, see the following resources.

In rare occasions, some maintenance activities on the Salesforce application servers wipe retained events. For example, maintenance activities, such as disaster recovery of servers after unexpected outages, a site switch of a Salesforce instance, or an org migration to a new data center, can wipe retained events. To prevent losing events, receive only the latest events by subscribing to the tip of the queue (-1 replay option).

Note

Filtered Subscriptions

Filtered subscriptions in Streaming API aren’t supported for platform events.

No SOQL Support

You can’t query event notifications using SOQL.

Platform Events Developer Guide

Apex, API, and SOQL Considerations for Platform Events

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