How to subscribe to platform events in Salesforce?

How to subscribe to platform events in Salesforce?

The empApi Lightning component and Visualforce apps receive event notifications through CometD. In an external app, you subscribe to events using CometD as well. You’ve probably used Apex triggers before, to perform actions based on database events. With platform events, the process is similar.

How to create a page in Salesforce platform?

A. By using a PageReference with a partial or full URL. B. By using the Page object and a Visualforce page name. C. By using the ApexPages.Page () method with a Visualforce page name. D. By using the PageReference.Page () method with a partial or full URL.

How to create a custom Visualforce page in Force.com?

B. Select “Disable Parallel Apex Testing” to run all the tests. C. Add test methods to existing test classes from previous deployments. D. Select “Fast Deployment” to bypass running all the tests. 5. When can a developer use a custom Visualforce page in a Force.com application?

What are the ANS’s in Salesforce Platform 1?

Ans 1) B. The Opportunity StandardController for pre-built functionality. Ans 2) C. Queries select the fewest fields and records possible to avoid exceeding governor limits. Ans 3) A. By using a PageReference with a partial or full URL. B. By using the Page object and a Visualforce page name.

Also, you can subscribe to platform events using Apex triggers, flows, processes, a Lightning component, and a CometD-based tool. To be able to understand this module, you should be familiar with at least one of these technologies. To be able to perform the hands-on challenge in this module, you should have knowledge of Apex triggers.

What do you need to know about apex triggers?

To be able to perform the hands-on challenge in this module, you should have knowledge of Apex triggers. Here is a list of a trail and modules you can take to learn Apex. If you’re familiar with an object-oriented programming language, check out these modules: Apex Basics & Database, Apex Triggers, and Apex Testing.

How does an event listener work in Salesforce?

An event listener (a trigger) in Salesforce receives the event and performs some actions. For example, the trigger might alert the sales representative to the return, and send a confirmation email to the customer.

How are event driven systems different from request-response models?

Unlike request-response communication models, software architecture built on an event-driven model decouples event producers from event consumers, thereby simplifying the communication model in connected systems. No requests need to be made to a server to obtain information about a certain state.

How are apex triggers used in the Salesforce platform?

On the Salesforce Platform, Apex triggers, processes, flows. The empApi Lightning component and Visualforce apps receive event notifications through CometD. In an external app, you subscribe to events using CometD as well. You’ve probably used Apex triggers before, to perform actions based on database events.

How to resume a suspended subscription in Salesforce?

To resume a suspended subscription, starting from new event messages, click Resume from Tip. You can’t manage subscriptions for flows and processes through the Subscriptions related list. When you save a trigger, the trigger subscription resumes automatically.

How does subscribe to platform events work in apex?

You’ve probably used Apex triggers before, to perform actions based on database events. With platform events, the process is similar. You simply write an after insert Apex trigger on the event object to subscribe to incoming events. Triggers provide an autosubscription mechanism in Apex.

What happens when you subscribe to platform events?

Launch flows or resume running instances of flows, called interviews, when platform event messages are received. Subscribed flows and interviews can receive event messages published through Apex, APIs, flows, and other processes. Flows and interviews provide an autosubscription mechanism.

How to subscribe to platform events in Lightning?

Subscribe to platform events with the empApi component in your Lightning web component or Aura component. The empApi component provides access to methods for subscribing to a streaming channel and listening to event messages. Use CometD to subscribe to platform events in an external client.