Streaming API Developer Guide
jNote: This release is in preview. Features described here don’t become generally available until the latest general availability date that Salesforce announces for this release. Before then, and where features are noted as beta, pilot, or developer preview, we can’t guarantee general availability within any particular time frame or at all. Make your purchase decisions only on the basis of generally available products and features.
Notifications
After a record is created or updated (an event), the record is evaluated against the PushTopic query and a notification might be generated. A notification is the message sent to the channel as the result of an event. The notification is a JSON formatted message. The PushTopic field NotifyForFields specifies how the record is evaluated against the PushTopic query. The NotifyForFields values are:
| NotifyForFields Value | Description |
|---|---|
| All | Notifications are generated for all record field changes, provided the evaluated records match the criteria specified in the WHERE clause. |
| Referenced (default) | Changes to fields referenced in the SELECT and WHERE clauses are evaluated. Notifications are generated for the evaluated records only if they match the criteria specified in the WHERE clause. |
| Select | Changes to fields referenced in the SELECT clause are evaluated. Notifications are generated for the evaluated records only if they match the criteria specified in the WHERE clause. |
| Where | Changes to fields referenced in the WHERE clause are evaluated. Notifications are generated for the evaluated records only if they match the criteria specified in the WHERE clause. |
The fields that you specify in the PushTopic query SELECT clause are contained in the notification message.