Method checkForFlowControlResponse

js.go:2328–2338

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

()

// based on the subscription current delivered index and the target.
// Runs under subscription lock
func (sub *Subscription) checkForFlowControlResponse() string {
	// Caller has verified that there is a sub.jsi and fc
	jsi := sub.jsi
	jsi.active = true
	if sub.getJSDelivered() >= jsi.fcd {
		fcr := jsi.fcr
		jsi.fcr, jsi.fcd = _EMPTY_, 0
		return fcr
	}
	return _EMPTY_
}

// Record an inbound flow control message.
// Runs under subscription lock