Publish and Receive Platform Events

Use EMP Connector to subscribe to a custom platform event that you defined earlier.

To create the Low_Ink__e platform event, follow the steps in Define a Custom Platform Event.

Publish event messages in the Developer Console using Apex. In this example, you publish the Low_Ink__e event messages.

In Salesforce Classic, select your name | Developer Console.
In Lightning Experience, click the quick access menu, and select Developer Console.
Select Debug | Open Execute Anonymous Window.

In the new window and replace the contents with this Apex code snippet.

1// Create event instance.
2Low_Ink__e event = new Low_Ink__e(Printer_Model__c='XZO-5', 
3                                  Serial_Number__c='12345', 
4                                  Ink_Percentage__c=0.2);
5
6// Publish event.
7Database.SaveResult sr = EventBus.publish(event);
8
9// Inspect publishing result for each event
10if (sr.isSuccess()) {
11    System.debug('Successfully published event.');
12} else {
13    for(Database.Error err : sr.getErrors()) {
14        System.debug('Error returned: ' +
15                    err.getStatusCode() +
16                    ' - ' +
17                    err.getMessage());
18    }
19}

Click Execute. After the platform event is published, EMP Connector receives an event notification, which is printed in the console. The output is similar to this example.

1Subscribed: Subscription [/event/Low_Ink__e:-1]
2Received:
3{
4  "schema": "5E5OtZj5_Gm6Vax9XMXH9A",
5  "payload": {
6    "CreatedById": "005RM000002Qu16YAC",
7    "CreatedDate": "2022-03-30T22:36:10.248Z",
8    "Printer_Model__c": "XZO-5",
9    "Serial_Number__c": "12345",
10    "Ink_Percentage__c": 0.2
11  },
12  "event": {
13    "EventApiName": "Low_Ink__e",
14    "EventUuid": "8b16da8a-a48a-464a-aee4-ea5c01134b0e",
15    "replayId": 10315
16  }
17}

Platform Events Developer Guide

Publish and Receive Platform Events