Streaming API Developer Guide
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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.