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onPushUpdateBefore

onPushUpdateBefore​

Called immediately before real-time (subscription) data is applied to the Data Set.

Parameters

  • contentsDSName (string): The name of the Data Set being updated
  • provInstName (string): The name of the subscribed Provider Instance

Returns: No return value — this is a callback, so its return value isn't used.

Description

Called just before new data from a Provider Instance you subscribed to with subscribeData is applied to the Data Set. Unlike the normal request path (onResponseUpdateBefore), there is no reqID concept here — this is a continuous push, not a request-response pair.

Example

function onPushUpdateBefore(contentsDSName, provInstName) {
  $log.i(contentsDSName + " push incoming from " + provInstName);
}

Related

  • The key difference: onResponseUpdateBefore handles normal request responses, onPushUpdateBefore handles real-time push data.
  • It never fires for a Provider Instance you haven't subscribed to.