///<summary>
            ///  return true means the transaction has been flushed.
            ///</summary>
            ///<param name="manager"> </param>
            ///<param name="transaction"> </param>
            ///<returns> true if message is flushed, false otherwise </returns>
            public bool End(ITransaction transaction)
            {
                lock (_mStack.SyncRoot)
                {
                    if (_mStack.Count != 0)
                    {
                        ITransaction current = _mStack.Peek();

                        if (transaction == current)
                        {
                            _mStack.Pop();
                            _mManager._mValidator.Validate(_mStack.Count == 0 ? null : _mStack.Peek(), current);
                        }
                        else
                        {
                            if (_mStack.FirstOrDefault(item => item == transaction) != null)
                            {
                                current = _mStack.Pop();
                                while (transaction != current && _mStack.Count != 0)
                                {
                                    _mManager._mValidator.Validate(_mStack.Peek(), current);

                                    current = _mStack.Pop();
                                }
                            }
                        }

                        if (_mStack.Count == 0)
                        {
                            IMessageTree tree = _mTree.Copy();
                            _mTree.MessageId         = null;
                            _mTree.Message           = null;
                            _mTree.EstimatedByteSize = 0;

                            if (_mTotalDurationInMicros > 0)
                            {
                                AdjustForTruncatedTransaction((ITransaction)tree.Message);
                            }

                            _mManager.Flush(tree);
                            return(true);
                        }
                    }
                    return(false);
                }
            }