public void MapRemove(String name, String key, IKVMapListener listener)
        {
            if (!IsConnected())
            {
                throw new Exception("not connected");
            }

            JsonObject envelope = new JsonObject();

            // synchronized to ensure message sequence numbers are ordered
            lock (writeLock)
            {
                long seqNum = Interlocked.Increment(ref messageIdGenerator);

                envelope.Add(ProtocolConstants.OP_FIELD, ProtocolOpConstants.OP_MAP_REMOVE);
                if (qos)
                {
                    envelope.Add(ProtocolConstants.SEQ_NUM_FIELD, seqNum);
                }
                if (name != null)
                {
                    envelope.Add(ProtocolConstants.MAP_FIELD, name);
                }
                if (key != null)
                {
                    envelope.Add(ProtocolConstants.KEY_FIELD, key);
                }

                MapContext ctx = new MapContext(seqNum, envelope.ToString(), key, null, listener);

                requests.Put(seqNum, ctx);

                Queue(ctx);
            }
        }
        public void MapSet(String name, String key, IMessage value, IKVMapListener listener)
        {
            if (!IsConnected())
            {
                throw new Exception("not connected");
            }

            JsonObject envelope = new JsonObject();

            // synchronized to ensure message sequence numbers are ordered
            lock (writeLock)
            {
                long seqNum = Interlocked.Increment(ref messageIdGenerator);

                envelope.Add(ProtocolConstants.OP_FIELD, ProtocolOpConstants.OP_MAP_SET);
                if (qos)
                {
                    envelope.Add(ProtocolConstants.SEQ_NUM_FIELD, seqNum);
                }
                if (name != null)
                {
                    envelope.Add(ProtocolConstants.MAP_FIELD, name);
                }
                if (key != null)
                {
                    envelope.Add(ProtocolConstants.KEY_FIELD, key);
                }
                if (value != null)
                {
                    envelope.Add(ProtocolConstants.VALUE_FIELD, ((JSONMessage)value)._rawData());
                }

                MapContext ctx = new MapContext(seqNum, envelope.ToString(), key, value, listener);

                if (maxMessageSize > 0 && ctx.GetJson().Length > maxMessageSize)
                {
                    throw new Exception("maximum message size exceeded");
                }

                requests.Put(seqNum, ctx);

                Queue(ctx);
            }
        }