/// <summary>
/// Creates a parallel downloader for a search query
/// </summary>
/// <param name="imageSearch">The image search to download</param>
/// <param name="maxDownloadThreads">The max number of threads to use when downloading</param>
/// <param name="buildImageDownloader">Configures a sequential image downloader builder</param>
/// <returns>A parallel downloader for the search query</returns>
public static ParallelPhilomenaImageSearchDownloader CreateParallelDownloader(this IPhilomenaImageSearch imageSearch, int maxDownloadThreads, Func <SequentialPhilomenaImageDownloaderBuilder, SequentialPhilomenaImageDownloaderBuilder> buildImageDownloader)
{
SequentialPhilomenaImageDownloaderBuilder builder = new SequentialPhilomenaImageDownloaderBuilder();
SequentialPhilomenaImageDownloader imageDownloader = buildImageDownloader(builder).Build();
return(new ParallelPhilomenaImageSearchDownloader(imageSearch, imageDownloader, maxDownloadThreads));
}
/// <summary>
/// Adds a conditional downloader
/// </summary>
/// <param name="shouldDownloadImage">A delegate that returns true if an image should be downloaded</param>
/// <param name="buildInnerDownloader">Configures the inner downloader builder</param>
public SequentialPhilomenaImageDownloaderBuilder WithConditionalDownloader(ShouldDownloadImageDelegate shouldDownloadImage, Func <SequentialPhilomenaImageDownloaderBuilder, SequentialPhilomenaImageDownloaderBuilder> buildInnerDownloader)
{
// Build the inner downloader
SequentialPhilomenaImageDownloaderBuilder builder = new SequentialPhilomenaImageDownloaderBuilder();
SequentialPhilomenaImageDownloader innerDownloader = buildInnerDownloader(builder).Build();
// Wrap the downloader in a conditional downloader
var conditionalDownloader = new ConditionalImageDownloader(shouldDownloadImage, innerDownloader);
return(new
(
_downloaders.Append(conditionalDownloader)
));
}