Salesforce Platform Events: Ultimate Guide For Event-Driven Solutions

Introduction

Salesforce Platform Events are a critical component of the Salesforce ecosystem, enabling real-time communication between Salesforce and external systems. These events serve as a powerful tool for event-driven architectures, allowing businesses to create more responsive, scalable, and integrated applications. Whether you’re syncing data between different platforms or automating internal processes, Platform Events ensure that information flows smoothly across systems.

In this guide, we will cover what Salesforce Platform Events are, how they work, and how businesses can benefit from them. You’ll also find best practices and insights to ensure your Platform Events implementation is as efficient and effective as possible.

What Are Salesforce Platform Events?

Salesforce Platform Events are a publish-subscribe mechanism that allows different systems to communicate with each other asynchronously. These events are part of Salesforce’s event-driven architecture, enabling systems to act on changes in real-time without waiting for manual updates or scheduled processes.

With Platform Events, developers can create custom notifications to share information across apps within and outside Salesforce. For example, when a record is updated in Salesforce, an event can be published to notify external systems about the change. This eliminates the need for continuous polling or complex integrations. Platform Events are particularly useful for scenarios that require immediate responses, such as order processing, payment confirmations, or IoT updates.

By using a simple yet robust framework, Platform Events help bridge gaps between systems, making them essential for modern business applications.

Understanding of Platform Event

Let’s understand the platform event in detail.

• SObject like Salesforce Entity
  • Suffixed with __e
  • ReplayId for replaying specific event
  • Only Checkbox, Date, Date/Time, Number, Text and Text Area field available.
• Pub/Sub based communication
  • No Polling required.
• Heterogeneous playloads
  • Define events with different payloads
    
    

Publishing / Subscribing Platform Events

Let’s understand how we can publish and subscribe the platform events in Salesforce.

Publish Platform Events

You can publish event messages from a Force.com app or an external app using Apex or Salesforce APIs and you can subscribe from the Salesforce or external apps or use long polling with cometD as well. We can publish the platform events in 3 ways:

1. Publish Events Messaging using APEX

List<Order_Shipping__e> orderShippingList = new List<Order_Shipping__e>();

Order_Shipping__e orderShipping = new Order_Shipping__e( Order_Number__c='12345', status__c=1 );

orderShippingList.add(orderShipping);

List<Database.SaveResult> results = EventBus.publish(orderShippingList);

for (Database.SaveResult sr : results) {
    if (sr.isSuccess()) {
        System.debug('Successfully published event.');
    } else {
        for(Database.Error err : sr.getErrors()) {
            System.debug('Error returned: ' + err.getStatusCode() );
        }
    }
}

2. Flow/ Process Builder

Publish Events Messaging using Declarative tools

• Process Builder
• Salesforce Flow Builder

Learn more about Platform Event Trigger flow.

3. Events Messaging using Salesforce API from external app

You can Publish Events Messaging using Salesforce API from external app. Here is sample of executing it from Salesforce workbench.

Subscribing Platform Events

We can subscribe the platform events with following ways.

1. Apex Trigger

Write an “after insert” Apex trigger on the event object to subscribe to incoming events.Triggers receive event notifications from various sources—whether they’re published through Apex or APIs.

Trigger OrderShippingTrigger on Order_Shipping__e (after Insert) {

}

2. Subscribe to platform event notification in Lightning components

Lightning web components

Use the empApi methods in your Lightning web component, import the methods from the lightning/empApi module as follows.

import { subscribe, unsubscribe, onError, setDebugFlag, isEmpEnabled }

    from 'lightning/empApi';

Subscibe in an Aura Component

Use the empApi methods in your Aura component, add the lightning:empApi component inside your custom component and assign an aura:id attribute to it.

<lightning:empApi aura:id="empApi"/>

3. In an external app

you subscribe to events using CometD as well.

4. Flow and process builder.

Check this post.

Salesforce Platform Events vs. Other Salesforce Messaging Systems

Salesforce offers multiple messaging systems, each designed for specific purposes. Platform Events, Push Topics, and Change Data Capture (CDC) all handle data notifications but differ in their use cases and implementation details.

Difference Between Platform Events and Push Topics

Push Topics are another Salesforce tool designed for real-time notifications, but they are more limited in scope. While Platform Events are custom events created by developers, Push Topics are tied to changes in Salesforce records based on predefined criteria. Platform Events provide greater flexibility and customization options, making them better suited for complex event-driven applications.

Comparing Platform Events with Change Data Capture (CDC)

Change Data Capture (CDC) is used to track changes to Salesforce records, but it differs from Platform Events in its purpose and execution. CDC is specifically focused on capturing changes to Salesforce data, whereas Platform Events allow for broader communication between Salesforce and external systems. CDC is best when the goal is to track record changes, while Platform Events are more versatile for building multi-system integrations.

Use Cases for Salesforce Platform Events

Salesforce Platform Events shine in scenarios where real-time data exchange and automation are critical. Below are some common use cases:

Streamlining Business Processes with Platform Events

Businesses can automate complex workflows using Platform Events. For example, when an order is placed, Salesforce can publish an event that triggers inventory updates, payment processing, and shipment scheduling—all without manual intervention. This reduces human error and speeds up operations.

Real-Time Data Synchronization with External Systems

Another powerful use case is integrating Salesforce with external systems such as ERPs or CRMs. Events can be used to instantly push data changes from Salesforce to other platforms, ensuring all systems have up-to-date information in real-time.

When to use platform events in Salesforce

Overcome Salesforce Governor Limits Using Platform Events. Mixed DML’S Operations, Too Many SOQL Queries, Too Many DML Statements, CPU Timeout: Salesforce’s Governor limits are there for a reason but even when you employ best practices you may still exceed them. A good developer will look at all tools available on the platform and find the best approach to solving the problem they are facing.

Summary

As more organizations move toward event-driven architectures, Salesforce Platform Events will play a crucial role in enabling scalable, flexible integrations. Future updates may include enhancements in performance, monitoring, and easier integration with other cloud platforms. The rise of serverless architectures and IoT could also expand the use cases for Platform Events, making them indispensable for enterprise solutions.