/// <summary>
/// Generates an optional step with the given number of threads.
/// </summary>
/// <param name="inDegreeOfParallism">How many threads should be available for this step.</param>
/// <typeparam name="TOptionalInOut">The In- and Output type of this step.</typeparam>
public OptionalPipelineStep <TOptionalInOut, TOptionalInOut> GenerateOptionalStep <TOptionalInOut>(int inDegreeOfParallism)
{
var pipelineStep = new OptionalPipelineStep <TOptionalInOut, TOptionalInOut>();
var stepIndex = PipelineSteps.Count;
for (int i = 0; i < inDegreeOfParallism; i++)
{
Task.Run(() =>
{
StartOptionalStep <TOptionalInOut>(stepIndex, pipelineStep);
});
}
PipelineSteps.Add(pipelineStep);
return(pipelineStep);
}
/// <summary>
/// Processes the optional step.
/// </summary>
/// <param name="inStepIndex">The index of this step in the pipeline.</param>
/// <param name="inOptionalStep">The optional step being processed.</param>
/// <typeparam name="TOptionalInOut">The In and Output type of the optional step.</typeparam>
private void StartOptionalStep <TOptionalInOut>(int inStepIndex, OptionalPipelineStep <TOptionalInOut, TOptionalInOut> inOptionalStep)
{
IPipelineStep <TOptionalInOut> nextPipelineStep = null;
foreach (var input in inOptionalStep.Buffer.GetConsumingEnumerable())
{
TOptionalInOut output = default(TOptionalInOut);
try
{
if (inOptionalStep.Choice(input.Input))
{
output = inOptionalStep.StepAction(input.Input);
}
}
catch (Exception e)
{
input.TaskCompletionSource.SetException(e);
continue;
}
FinishStep(input, output, inStepIndex, ref nextPipelineStep);
}
}
