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Add AbsentFromLastScan

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Mbucari 2023-03-07 16:00:23 -07:00 • committed by MBucari
parent bd49db83e4
commit f6dcc0db1d
6 changed files with 477 additions and 3 deletions
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2
Source/DtoImporterService/ImportItem.cs
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@ -8,5 +8,7 @@ namespace DtoImporterService
public Item DtoItem { get; set; }
public string AccountId { get; set; }
public string LocaleName { get; set; }
public override string ToString()
=> DtoItem is null ? base.ToString() : $"[{DtoItem.ProductId}] {DtoItem.Title}";
}
}

32
Source/DtoImporterService/LibraryBookImporter.cs
View file

@ -3,6 +3,7 @@ using System.Collections.Generic;
using System.Linq;
using AudibleUtilities;
using DataLayer;
using Dinah.Core;
using Dinah.Core.Collections.Generic;
namespace DtoImporterService
@ -40,9 +41,8 @@ namespace DtoImporterService
//
// CURRENT SOLUTION: don't re-insert
var currentLibraryProductIds = DbContext.LibraryBooks.Select(l => l.Book.AudibleProductId).ToList();
var newItems = importItems
.Where(dto => !currentLibraryProductIds.Contains(dto.DtoItem.ProductId))
.ExceptBy(DbContext.LibraryBooks.Select(lb => lb.Book.AudibleProductId), imp => imp.DtoItem.ProductId)
.ToList();
// if 2 accounts try to import the same book in the same transaction: error since we're only tracking and pulling by asin.
@ -55,7 +55,11 @@ namespace DtoImporterService
var libraryBook = new LibraryBook(
bookImporter.Cache[newItem.DtoItem.ProductId],
newItem.DtoItem.DateAdded,
newItem.AccountId);
newItem.AccountId)
{
AbsentFromLastScan = isPlusTitleUnavailable(newItem)
};
try
{
DbContext.LibraryBooks.Add(libraryBook);
@ -66,8 +70,30 @@ namespace DtoImporterService
}
}
//If an existing Book wasn't found in the import, the owning LibraryBook's Book will be null.
foreach (var nullBook in DbContext.LibraryBooks.AsEnumerable().Where(lb => lb.Book is null))
nullBook.AbsentFromLastScan = true;
//Join importItems on LibraryBooks before iterating over LibraryBooks to avoid
//quadratic complexity caused by searching all of importItems for each LibraryBook.
//Join uses hashing, so complexity should approach O(N) instead of O(N^2).
var items_lbs
= importItems
.Join(DbContext.LibraryBooks, o => (o.AccountId, o.DtoItem.ProductId), i => (i.Account, i.Book?.AudibleProductId), (o, i) => (o, i));
foreach ((ImportItem item, LibraryBook lb) in items_lbs)
lb.AbsentFromLastScan = isPlusTitleUnavailable(item);
var qtyNew = hash.Count;
return qtyNew;
}
//This SEEMS to work to detect plus titles which are no longer available.
//I have my doubts it won't yield false negatives, but I have more
//confidence that it won't yield many/any false positives.
private static bool isPlusTitleUnavailable(ImportItem item)
=> item.DtoItem.IsAyce is true
&& !item.DtoItem.Plans.Any(p => p.PlanName.ContainsInsensitive("Minerva") || p.PlanName.ContainsInsensitive("Free"));
}
}