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Why do you need a streaming API in Salesforce?
Streaming API is your radar. It lets you define events and push notifications to your client app when the events occur. You don’t have to keep an active lookout for data changes—you don’t have to constantly poll Salesforce and make unnecessary API requests.
How to create a streaming channel in Salesforce?
Alternatively, you can opt to have Salesforce create the streaming channel dynamically for you if it doesn’t exist. To enable dynamic streaming channels in your org, from Setup, enter User Interface in the Quick Find box, then select User Interface. On the User Interface page, select the Enable Dynamic Streaming Channel Creation option.
How are platform events defined in Salesforce Lightning?
Unlike PushTopic and Change Data Capture events, platform events aren’t tied to Salesforce records and aren’t autopublished by Salesforce. Instead, you define the schema of a platform event message by creating a platform event and adding fields. Also, clients publish platform events using declarative tools on the Lightning Platform, Apex, or APIs.
What’s the difference between cometd and Bayeux API?
Streaming API uses the Bayeux protocol and CometD for long polling. Bayeux is a protocol for transporting asynchronous messages, primarily over HTTP. CometD is a scalable HTTP-based event routing bus that uses an AJAX push technology pattern known as Comet.
How is a VF page used in Visualforce?
Specifically, the VF page lets users select a fiscal year from a picklist and then presents summary data for the year (total $ amount for all Opportunities, total closed won $ amount, total closed lost $ amount etc.) using a simple Visualforce Pie Chart.
How to create a streaming channel using REST API?
A streaming channel is represented by the StreamingChannel sObject, so you can create it through Apex, REST API, or SOAP API. The format of the channel name for generic streaming is /u/ ChannelName. For example, this Apex snippet creates a channel named Broadcast. StreamingChannel ch = new StreamingChannel(); ch.Name = ‘/u/Broadcast’; insert ch;
Where do notifications come from in Salesforce trailhead?
By default, the fields in the SELECT statement field list and WHERE clause are the ones that trigger notifications. Notifications are sent only for the records that match the criteria in the WHERE clause. Notifications include the fields from the SELECT clause.
Why do we need jsforce in Salesforce App?
It capsulates the access to various APIs provided by Salesforce in asynchronous JavaScript function calls. Unlike other Salesforce API libraries, it is intended to give integrated interface both server-side and client-side apps, so you don’t have to rewrite similar logics with different libraries only for running in different environment.
How to get jsforce session ID in Visualforce?
If you are writing HTML5 apps on Visualforce, API access token is automatically obtained as session ID. You can just pass it to Connection constructor to initialize. Also you can use static resources to upload JSforce JavaScript file to include.
Which is the latest version of Streaming API?
A Bayeux client connects to Streaming API in multiple stages. For clients subscribed with API version 37.0 or later, Streaming API provides reliable message delivery by enabling you to replay past events through durable streaming. Clients subscribed with API version 36.0 or earlier might not receive all messages in some situations.
How can I track data changes in Salesforce?
Tracking data changes in Salesforce is especially useful when you have business data stored in a system external to Salesforce. You can use Streaming API to keep your external source in sync with your Salesforce data with PushTopic events and Change Data Capture events.
When does Java-HTTP transport error : connection refused?
Everything is fine as long as i use localhost or 127.0.0.1 as endpoint in client app. But when i try to install webservice on remote machine and access it, i receive an error in client app: com.sun.xml.ws.client.ClientTransportException: HTTP transport error: java.net.ConnectException: Connection refused: connect