+ register map[uint16]*Subscription
+ counter uint16
+ mutex sync.Mutex
+}
+
+// This method should run as a constructor
+func (r *Registry) Initialize(seedsn uint16) {
+ r.register = make(map[uint16]*Subscription)
+ r.counter = seedsn
+}
+
+// Reserves and returns the next free sequence number
+func (r *Registry) ReserveSubscription() *Subscription {
+ // Check is current SequenceNumber valid
+ // Allocate next SequenceNumber value and retry N times
+ r.mutex.Lock()
+ defer r.mutex.Unlock()
+ var subs *Subscription = nil
+ var retrytimes uint16 = 1000
+ for ; subs == nil && retrytimes > 0; retrytimes-- {
+ sequenceNumber := r.counter
+ if r.counter == 65535 {
+ r.counter = 0
+ } else {
+ r.counter++
+ }
+ if _, ok := r.register[sequenceNumber]; ok == false {
+ r.register[sequenceNumber] = &Subscription{sequenceNumber, false}
+ return r.register[sequenceNumber]
+ }
+ }
+ return nil
+}
+
+// This function checks the validity of the given subscription id
+func (r *Registry) GetSubscription(sn uint16) *Subscription {
+ r.mutex.Lock()
+ defer r.mutex.Unlock()
+ xapp.Logger.Debug("Registry map: %v", r.register)
+ if _, ok := r.register[sn]; ok {
+ return r.register[sn]
+ }
+ return nil
+}
+
+// This function checks the validity of the given subscription id
+func (r *Registry) IsValidSequenceNumber(sn uint16) bool {
+ r.mutex.Lock()
+ defer r.mutex.Unlock()
+ xapp.Logger.Debug("Registry map: %v", r.register)
+ if _, ok := r.register[sn]; ok {
+ return true
+ }
+ return false
+}
+
+// This function sets the give id as confirmed in the register
+func (r *Registry) setSubscriptionToConfirmed(sn uint16) {
+ r.mutex.Lock()
+ defer r.mutex.Unlock()
+ r.register[sn].Confirmed()