74 lines
2.9 KiB
C#
74 lines
2.9 KiB
C#
using System;
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using System.Linq;
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using System.Threading.Tasks;
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using ApplicationServices;
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using DataLayer;
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using Dinah.Core.ErrorHandling;
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namespace FileLiberator
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{
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public static class IProcessableExt
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{
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//
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// DO NOT USE ConfigureAwait(false) WITH ProcessAsync() unless ensuring ProcessAsync() implementation is cross-thread compatible
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// ProcessAsync() often does a lot with forms in the UI context
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//
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/// <summary>Process the first valid product. Create default context</summary>
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/// <returns>Returns either the status handler from the process, or null if all books have been processed</returns>
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public static async Task<StatusHandler> ProcessFirstValidAsync(this IProcessable processable)
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{
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var libraryBook = processable.getNextValidBook();
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if (libraryBook == null)
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return null;
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return await processBookAsync(processable, libraryBook);
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}
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/// <summary>Process the first valid product. Create default context</summary>
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/// <returns>Returns either the status handler from the process, or null if all books have been processed</returns>
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public static async Task<StatusHandler> ProcessSingleAsync(this IProcessable processable, string productId)
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{
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using var context = DbContexts.GetContext();
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var libraryBook = context
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.Library
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.GetLibrary()
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.SingleOrDefault(lb => lb.Book.AudibleProductId == productId);
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if (libraryBook == null)
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return null;
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if (!processable.Validate(libraryBook))
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return new StatusHandler { "Validation failed" };
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return await processBookAsync(processable, libraryBook);
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}
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private static async Task<StatusHandler> processBookAsync(IProcessable processable, LibraryBook libraryBook)
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{
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// this should never happen. check anyway. ProcessFirstValidAsync returning null is the signal that we're done. we can't let another IProcessable accidentally send this command
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var status = await processable.ProcessAsync(libraryBook);
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if (status == null)
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throw new Exception("Processable should never return a null status");
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return status;
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}
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private static LibraryBook getNextValidBook(this IProcessable processable)
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{
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var libraryBooks = DbContexts.GetContext().GetLibrary_Flat_NoTracking();
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foreach (var libraryBook in libraryBooks)
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if (processable.Validate(libraryBook))
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return libraryBook;
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return null;
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}
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public static async Task<StatusHandler> TryProcessAsync(this IProcessable processable, LibraryBook libraryBook)
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=> processable.Validate(libraryBook)
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? await processable.ProcessAsync(libraryBook)
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: new StatusHandler();
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}
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}
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