What is Salesforce push topic?

What is Salesforce push topic?

CometD enables the server to push data to the client when the data is available and while the client maintains a connection to the server. They enable you to stream Salesforce record changes to clients based on criteria you define in a SOQL query in a PushTopic record.

What is a push topic?

A PushTopic is an sObject that contains the criteria of events you want to listen to, such as data changes for a particular object. You define the criteria as a SOQL query in the PushTopic and specify the record operations to notify on (create, update, delete, and undelete).

How do I subscribe to a push topic?

Select queries -> Streaming Push Topics. In the Push Topic field, select Account. Click Subscribe. You’ll see the connection and response information and a response like Subscribed to /topic/Account .

How does Salesforce detect PushTopic?

From Setup, enter Company Information in the Quick Find box, then select Company Information. PushTopic event usage is displayed with the label Streaming API Events, Last 24 Hours.

What is CometD client?

CometD is a set of library to write web applications that perform messaging over the web. CometD ships a JavaScript client library, a Java client library and a Java server library. This allows you to write applications in the browser with fine-grained logic and control on the server.

How do you broadcast a message with generic streaming?

To use generic events, you need:

1. A StreamingChannel that defines the channel, with a name that is case-sensitive.
2. One or more clients subscribed to the channel.
3. The Streaming Channel Push REST API resource to monitor and invoke push events on the channel.

What is urlMapping in REST API?

The @RestResource annotation is used at the class level and enables you to expose an Apex class as a REST resource. A URL mapping for my_url will only match a REST resource containing my_url and not My_Url . To use this annotation, your Apex class must be defined as global.

How do I run a REST API in Salesforce?

The first step is to log in to Workbench.

1. Log in to your Trailhead Playground and navigate to Workbench.
2. For Environment, select Production.
3. For API Version, select the highest available number.
4. Make sure that you select I agree to the terms of service.
5. Click Login with Salesforce.

How does a pushtopic event work in Salesforce?

A record is created, updated, deleted, or undeleted (an event occurs). The changes to that record are evaluated. If the record changes match the criteria of the PushTopic query, a notification is generated by the server and received by the subscribed clients.

How does a push notification work in Salesforce?

In some cases, if the user is both the person causing the notification to go out and the receiver of the notification, and Mobile and Desktop are selected, the user will only see the notification on the Mobile device when entering the app itself, assuming they have not already clicked on it in the Desktop app.

Which is a typical application of pushtopic events?

A typical application of PushTopic events is refreshing the UI of a custom app from Salesforce record changes. The generation of PushTopic notifications follows this sequence. Create a PushTopic based on a SOQL query. The PushTopic defines the channel. Clients subscribe to the channel.

How are pushtopic events defined in soql query?

Create a PushTopic based on a SOQL query. The PushTopic defines the channel. Clients subscribe to the channel. A record is created, updated, deleted, or undeleted (an event occurs). The changes to that record are evaluated.