//-----------------------------------------------------------------------------------------------------------------------------------------------------
public void Perform()
{
_performedSteps.Clear();
try
{
foreach (var builder in _stepBuilders)
{
var steps = builder.GetSteps();
foreach (var step in steps)
{
step.Perform();
_performedSteps.Push(step);
}
}
_state = RevertableSequenceState.Performed;
}
catch (Exception performException)
{
try
{
Revert();
}
catch (Exception revertException)
{
_state = RevertableSequenceState.RevertFailed;
throw new AggregateException(performException, revertException).Flatten();
}
throw;
}
}
//-----------------------------------------------------------------------------------------------------------------------------------------------------
public RevertableSequence(IRevertableSequenceCodeBehind codeBehind)
{
_codeBehind = codeBehind;
_stepBuilders = new List <StepBuilder>();
_performedSteps = new Stack <Step>();
_state = RevertableSequenceState.NotPerformed;
_codeBehind.BuildSequence(this);
}
//-----------------------------------------------------------------------------------------------------------------------------------------------------
public void Revert()
{
var revertExceptions = new List <Exception>();
var stepsFailedToRevert = new Stack <Step>();
while (_performedSteps.Count > 0) // LIFO loop
{
var step = _performedSteps.Pop();
try
{
step.Revert();
}
catch (Exception e)
{
revertExceptions.Add(e);
stepsFailedToRevert.Push(step);
}
}
if (revertExceptions.Count == 0)
{
_state = RevertableSequenceState.Reverted;
}
else
{
_state = RevertableSequenceState.RevertFailed;
foreach (var step in stepsFailedToRevert)
{
_performedSteps.Push(step);
}
throw new AggregateException(revertExceptions);
}
}
