Platform Events and Change Data Capture

Apex ProgrammingPlatform Events and Change Data CaptureBuild event-driven solutions on Salesforce: define and publish Platform Events, subscribe with Apex, Flow, LWC and external clients, stream record changes with Change Data Capture, and operate it all within allocations.Advanced · about 75 minutesWhat you will learn

Explain the publish/subscribe model of the Salesforce event bus, replay IDs and retention

Define a platform event and choose between Publish Immediately and Publish After Commit

Publish events from Apex and handle SaveResults and publish callbacks

Write robust platform event triggers using batch size, resume checkpoints, RetryableException and PlatformEventSubscriberConfig

Subscribe from Flow, LWC (lightning/empApi) and external systems

Configure Change Data Capture, read the ChangeEventHeader and handle gap and overflow events

Monitor event usage and test event-driven code with Test.getEventBus()

Contents

Event-driven architecture on Salesforce

Defining a platform event

Publishing events

Subscribing with Apex triggers

Subscribing with Flow

Subscribing in the browser: lightning/empApi

External subscribers: Pub/Sub API and CometD

Change Data Capture

Event Relay to Amazon EventBridge

Allocations, limits and monitoring

Testing event-driven Apex

Patterns

Best practices

Common pitfalls

Hands-on exercises

Key takeaways