public static async Task <StatusHandler> ProcessSingleAsync(this IProcessable processable, LibraryBook libraryBook)
{
if (!processable.Validate(libraryBook))
{
return new StatusHandler {
"Validation failed"
}
}
;
return(await processable.ProcessBookAsync_NoValidation(libraryBook));
}
private static LibraryBook getNextValidBook(this IProcessable processable)
{
var libraryBooks = DbContexts.GetContext().GetLibrary_Flat_NoTracking();
foreach (var libraryBook in libraryBooks)
{
if (processable.Validate(libraryBook))
{
return(libraryBook);
}
}
return(null);
}
/// <summary>Process the first valid product. Create default context</summary>
/// <returns>Returns either the status handler from the process, or null if all books have been processed</returns>
public static async Task <StatusHandler> ProcessSingleAsync(this IProcessable processable, string productId)
{
using var context = DbContexts.GetContext();
var libraryBook = context
.Library
.GetLibrary()
.SingleOrDefault(lb => lb.Book.AudibleProductId == productId);
if (libraryBook == null)
{
return(null);
}
if (!processable.Validate(libraryBook))
{
return new StatusHandler {
"Validation failed"
}
}
;
return(await processBookAsync(processable, libraryBook));
}
public static async Task <StatusHandler> TryProcessAsync(this IProcessable processable, LibraryBook libraryBook)
=> processable.Validate(libraryBook)
? await processable.ProcessAsync(libraryBook)
: new StatusHandler();
//
// DO NOT USE ConfigureAwait(false) WITH ProcessAsync() unless ensuring ProcessAsync() implementation is cross-thread compatible
// ProcessAsync() often does a lot with forms in the UI context
//
// when used in foreach: stateful. deferred execution
public static IEnumerable <LibraryBook> GetValidLibraryBooks(this IProcessable processable)
=> DbContexts.GetContext()
.GetLibrary_Flat_NoTracking()
.Where(libraryBook => processable.Validate(libraryBook));
