private async Task <Guid> SubscribeAsync(bool includeValues, TKey key, bool hasKey, Action <MultiDictionaryEventHandlers <TKey, TValue> > handle)
        {
            if (hasKey && key == null)
            {
                throw new ArgumentNullException(nameof(key));
            }
            if (handle == null)
            {
                throw new ArgumentNullException(nameof(handle));
            }

            var handlers = new MultiDictionaryEventHandlers <TKey, TValue>();

            handle(handlers);

            // 0: no entryKey
            // 1: entryKey
            var mode = hasKey ? 1 : 0;

            var subscribeRequest = mode switch
            {
                0 => MultiMapAddEntryListenerCodec.EncodeRequest(Name, includeValues, Cluster.IsSmartRouting),
                1 => MultiMapAddEntryListenerToKeyCodec.EncodeRequest(Name, ToData(key), includeValues, Cluster.IsSmartRouting),
                _ => throw new NotSupportedException()
            };

            var subscription = new ClusterSubscription(
                subscribeRequest,
                ReadSubscribeResponse,
                CreateUnsubscribeRequest,
                ReadUnsubscribeResponse,
                HandleEventAsync,
                new MapSubscriptionState(mode, Name, handlers));

            await Cluster.Events.InstallSubscriptionAsync(subscription).CAF();

            return(subscription.Id);
        }
 public MapSubscriptionState(int mode, string name, MultiDictionaryEventHandlers <TKey, TValue> handlers)
     : base(name, handlers)
 {
     Mode = mode;
 }