public StepsValidator(Func <StepValidatorContext, IValidator <Step> > stepValidatorFn)
{
CascadeMode = CascadeMode.StopOnFirstFailure;
RuleForEach(steps => steps)
.SetValidator(c =>
{
var context = new StepValidatorContext
{
StepIds = c.Select(x => x.Name).ToList()
};
return(stepValidatorFn(context));
});
RuleFor(steps => steps)
.Custom((steps, context) =>
{
if (steps.All(s => s.Dependencies != null && s.Dependencies.Length > 0))
{
context.AddFailure("All the steps have dependencies. None can be executed");
return;
}
var stepsStatus = steps.ToDictionary(s => s.Name, s => false);
var independentSteps =
steps.Where(s => s.Dependencies == null || s.Dependencies.Length == 0).ToList();
foreach (var independentStep in independentSteps)
{
stepsStatus[independentStep.Name] = true;
}
while (stepsStatus.Any(s => s.Value == false))
{
var pendingSteps = stepsStatus.Count(s => s.Value == false);
var dependentSteps = steps.Where(s => s.Dependencies != null && s.Dependencies.Length > 0);
foreach (var dependentStep in dependentSteps)
{
var dependencies = dependentStep.Dependencies;
if (dependencies.All(d => stepsStatus[d]))
{
stepsStatus[dependentStep.Name] = true;
}
}
if (pendingSteps == stepsStatus.Count(s => s.Value == false))
{
// deadlock
break;
}
}
if (stepsStatus.Any(s => s.Value == false))
{
context.AddFailure("Steps cannot have cyclic dependencies");
}
});
}
public StepValidator(StepValidatorContext validatorContext)
{
CascadeMode = CascadeMode.Continue;
RuleFor(s => s.Name)
.NotEmpty()
.WithMessage("Step Name must be specified");
RuleFor(s => s.Commands)
.Must(c => c != null && c.Count > 0)
.WithMessage("A step must have at least one command");
RuleFor(s => s.Dependencies)
.Custom((dependencies, context) =>
{
if (dependencies != null && dependencies.Length > 0)
{
foreach (var dependency in dependencies)
{
if (!validatorContext.StepIds.Contains(dependency))
{
context.AddFailure($"Unknown dependency :{dependency}");
}
}
}
});
}