// Returned values will be invalidated by the next Subscribers call
func (this *memTopics) Subscribers(topic []byte, qos byte, subs *[]interface{}, qoss *[]byte) error {
if !message.ValidQos(qos) {
return fmt.Errorf("Invalid QoS %d", qos)
}
this.smu.RLock()
defer this.smu.RUnlock()
*subs = (*subs)[0:0]
*qoss = (*qoss)[0:0]
return this.sroot.smatch(topic, qos, subs, qoss)
}
func (this *memTopics) Subscribe(topic []byte, qos byte, sub interface{}) (byte, error) {
if !message.ValidQos(qos) {
return message.QosFailure, fmt.Errorf("Invalid QoS %d", qos)
}
if sub == nil {
return message.QosFailure, fmt.Errorf("Subscriber cannot be nil")
}
this.smu.Lock()
defer this.smu.Unlock()
if qos > MaxQosAllowed {
qos = MaxQosAllowed
}
if err := this.sroot.sinsert(topic, qos, sub); err != nil {
return message.QosFailure, err
}
return qos, nil
}