public virtual void Execute(BpmnStackTrace stackTrace)
        {
            if ((operation != PvmAtomicOperationFields.ActivityStartCancelScope) &&
                (operation != PvmAtomicOperationFields.ActivityStartInterruptScope) &&
                (operation != PvmAtomicOperationFields.ActivityStartConcurrent))
            {
                // execution might be replaced in the meantime:
                ExecutionEntity replacedBy = (ExecutionEntity)execution.ReplacedBy;
                if (replacedBy != null)
                {
                    execution = replacedBy;
                }
            }

            //execution was canceled for example via terminate end event
            if (execution.Canceled &&
                (operation == PvmAtomicOperationFields.TransitionNotifyListenerEnd ||
                 operation == PvmAtomicOperationFields.ActivityNotifyListenerEnd))
            {
                return;
            }

            //// execution might have ended in the meanwhile
            if (execution.IsEnded &&
                (operation == PvmAtomicOperationFields.TransitionNotifyListenerTake ||
                 operation == PvmAtomicOperationFields.ActivityStartCreateScope))
            {
                return;
            }
            //TODO Context.CurrentProcessApplication
            var currentPa = context.Impl.Context.CurrentProcessApplication;

            if (currentPa != null)
            {
                applicationContextName = currentPa.Name;
            }
            activityId = execution.ActivityId;
            stackTrace.Add(this);

            try
            {
                Context.SetExecutionContext(execution);
                if (!performAsync)//同步
                {
                    Log.DebugExecutingAtomicOperation(operation, execution);
                    operation.Execute(execution);
                }
                else//异步
                {
                    execution.ScheduleAtomicOperationAsync(this);
                }
            }
            catch (ClassMethodDelegateException ex)
            {
                if (execution.IsInTransaction)
                {
                    System.Transactions.Transaction tr = Context.CommandContext.CurrentTransaction;
                    Log.LogDebug("外部代码异常,事务Id:", tr.TransactionInformation.LocalIdentifier);
                    if (context.Impl.Context.CommandContext.CurrentTransaction != null)
                    {
                        Log.LogDebug("移除当前外部事务,添加到待回滚中。", context.Impl.Context.CommandContext.CurrentTransaction.TransactionInformation.LocalIdentifier);
                        context.Impl.Context.CommandContext.MoveToRollBack();
                    }
                }
                else
                {
                    Log.LogDebug("外部代码不在事务范围内,ActivityId:" + execution.ActivityId, ex.Message);
                }
            }
            //debug抛异常
            catch (System.Exception e)
            {
                throw e;
            }
            finally
            {
                context.Impl.Context.RemoveExecutionContext();
            }
        }