Method getJSDelivered

js.go:2318–2323

For jetstream subscriptions, returns the number of delivered messages. For ChanSubscription, this value is computed based on the known number of messages added to the channel minus the current size of that channel. Lock held on entry

()

// of messages added to the channel minus the current size of that channel.
// Lock held on entry
func (sub *Subscription) getJSDelivered() uint64 {
	if sub.typ == ChanSubscription {
		return sub.jsi.fciseq - uint64(len(sub.mch))
	}
	return sub.delivered
}

// checkForFlowControlResponse will check to see if we should send a flow control response
// based on the subscription current delivered index and the target.