/// <summary>
/// Ends a transformation by waiting (synchronously) for it to finish.
/// </summary>
/// <typeparam name="TProduce">The type of the items produced.</typeparam>
/// <param name="transformer">The transformer to finish.</param>
/// <returns>The results of the transformation.</returns>
public static TProduce[] EndTransform <TProduce>(this IProduceTransformer <TProduce> transformer)
{
using (transformer)
{
transformer.ExecuteAsync().Wait();
return(transformer.Produce.ToArray());
}
}
/// <summary>
/// Ends a transformation by waiting (asynchronously) for it to finish.
/// </summary>
/// <typeparam name="TProduce">The type of the items produced.</typeparam>
/// <param name="transformer">The transformer to finish.</param>
/// <returns>The results of the transformation.</returns>
public static Task <TProduce[]> EndTransformAsync <TProduce>(this IProduceTransformer <TProduce> transformer)
{
// Create a task completion for when we've gotten the results from the transformer
var taskCompletionSource = new TaskCompletionSource <TProduce[]>();
try
{
// Create the transform task for the actual transformation
var transformTask = transformer.ExecuteAsync();
// When the transform is done resolve the task completion
transformTask.ContinueWith(t =>
{
try
{
switch (t.Status)
{
case TaskStatus.Canceled:
// Set the task result to canceled
taskCompletionSource.SetCanceled();
break;
case TaskStatus.Faulted:
// Set the task result to the exception in the transformation task
taskCompletionSource.SetException(t.Exception);
break;
default:
// Set the task result to transformer's production collection
taskCompletionSource.SetResult(transformer.Produce.ToArray());
break;
}
}
catch (Exception exception)
{
taskCompletionSource.TrySetException(exception);
}
finally
{
// Dispose of the transformer now that we got everything from it
transformer.Dispose();
}
});
}
catch
{
// If there was an exception starting the transformation dispose of the transformer and r-throw the exception
transformer.Dispose();
throw;
}
// Return the task completion source
return(taskCompletionSource.Task);
}
