protected internal IMessage DecodeLine(ChannelBuffer buf, ITransaction parent,
                                               Stack<ITransaction> stack, IMessageTree tree)
        {
            BufferHelper helper = _mBufferHelper;
            byte identifier = buf.ReadByte();
            String timestamp = helper.Read(buf, TAB);
            String type = helper.Read(buf, TAB);
            String name = helper.Read(buf, TAB);

            if (identifier == 'E')
            {
                IMessage evt = new DefaultEvent(type, name);
                String status = helper.Read(buf, TAB);
                String data = helper.ReadRaw(buf, TAB);

                helper.Read(buf, LF); // get rid of line feed
                evt.Timestamp = _mDateHelper.Parse(timestamp);
                evt.Status = status;
                evt.AddData(data);

                if (parent != null)
                {
                    parent.AddChild(evt);
                    tree.EstimatedByteSize += evt.EstimateByteSize();
                    return parent;
                }
                return evt;
            }
            if (identifier == 'M')
            {
                DefaultMetric metric = new DefaultMetric(type, name);
                String status = helper.Read(buf, TAB);
                String data = helper.ReadRaw(buf, TAB);

                helper.Read(buf, LF); // get rid of line feed
                metric.Timestamp = _mDateHelper.Parse(timestamp);
                metric.Status = status;
                metric.AddData(data);

                if (parent != null)
                {
                    parent.AddChild(metric);
                    tree.EstimatedByteSize += metric.EstimateByteSize();
                    return parent;
                }
                return metric;
            }
            if (identifier == 'H')
            {
                IMessage heartbeat = new DefaultHeartbeat(type, name);
                String status0 = helper.Read(buf, TAB);
                String data1 = helper.ReadRaw(buf, TAB);

                helper.Read(buf, LF); // get rid of line feed
                heartbeat.Timestamp = _mDateHelper.Parse(timestamp);
                heartbeat.Status = status0;
                heartbeat.AddData(data1);

                if (parent != null)
                {
                    parent.AddChild(heartbeat);
                    tree.EstimatedByteSize += heartbeat.EstimateByteSize();
                    return parent;
                }
                return heartbeat;
            }
            if (identifier == 't')
            {
                IMessage transaction = new DefaultTransaction(type, name,
                                                              null);

                helper.Read(buf, LF); // get rid of line feed
                transaction.Timestamp = _mDateHelper.Parse(timestamp);

                if (parent != null)
                {
                    parent.AddChild(transaction);
                }

                stack.Push(parent);
                return transaction;
            }
            if (identifier == 'A')
            {
                ITransaction transaction2 = new DefaultTransaction(type, name, null);
                String status3 = helper.Read(buf, TAB);
                String duration = helper.Read(buf, TAB);
                String data4 = helper.ReadRaw(buf, TAB);

                helper.Read(buf, LF); // get rid of line feed
                transaction2.Timestamp = _mDateHelper.Parse(timestamp);
                transaction2.Status = status3;
                transaction2.AddData(data4);

                long d = Int64.Parse(duration.Substring(0, duration.Length - 2), NumberStyles.Integer);
                transaction2.DurationInMicros = d;

                if (parent != null)
                {
                    parent.AddChild(transaction2);
                    tree.EstimatedByteSize += transaction2.EstimateByteSize();
                    return parent;
                }
                return transaction2;
            }
            if (identifier == 'T')
            {
                String status5 = helper.Read(buf, TAB);
                String duration6 = helper.Read(buf, TAB);
                String data7 = helper.ReadRaw(buf, TAB);

                helper.Read(buf, LF); // get rid of line feed
                parent.Status = status5;
                parent.AddData(data7);

                long d8 = Int64.Parse(
                    duration6.Substring(0, duration6.Length - 2),
                    NumberStyles.Integer);
                parent.DurationInMicros = d8;
                tree.EstimatedByteSize += parent.EstimateByteSize();
                return stack.Pop();
            }
            Logger.Error("Unknown identifier(" + identifier + ") of message: " + buf);

            // unknown message, ignore it
            return parent;
        }
        public virtual IHeartbeat NewHeartbeat(String type, String name, String nameValuePairs)
        {
            if (!_mManager.HasContext())
            {
                _mManager.Setup();
            }

            if (_mManager.CatEnabled)
            {
                IHeartbeat heartbeat = new DefaultHeartbeat(type, name);
                if (!string.IsNullOrEmpty(nameValuePairs))
                {
                    heartbeat.AddData(nameValuePairs);
                }
                _mManager.Add(heartbeat);
                return heartbeat;
            }
            return new NullHeartbeat();
        }