113 lines
2.3 KiB
C#
113 lines
2.3 KiB
C#
using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using DataLayer;
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using LibationSearchEngine;
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namespace ApplicationServices
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{
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public static class SearchEngineCommands
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{
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#region Search
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public static SearchResultSet Search(string searchString) => performSafeQuery(e =>
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e.Search(searchString)
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);
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private static T performSafeQuery<T>(Func<SearchEngine, T> func)
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{
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var engine = new SearchEngine();
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try
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{
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return func(engine);
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}
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catch (FileNotFoundException)
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{
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fullReIndex(engine);
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return func(engine);
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}
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}
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#endregion
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public static event EventHandler SearchEngineUpdated;
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#region Update
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private static bool isUpdating;
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public static void UpdateBooks(IEnumerable<Book> books)
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{
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// Semi-arbitrary. At some point it's more worth it to do a full re-index than to do one offs.
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// I did not benchmark before choosing the number here
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if (books.Count() > 15)
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FullReIndex();
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else
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{
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foreach (var book in books)
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{
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UpdateLiberatedStatus(book);
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UpdateBookTags(book);
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UpdateUserRatings(book);
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}
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}
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}
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public static void FullReIndex() => performSafeCommand(e =>
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fullReIndex(e)
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);
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internal static void UpdateLiberatedStatus(Book book) => performSafeCommand(e =>
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e.UpdateLiberatedStatus(book)
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);
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internal static void UpdateBookTags(Book book) => performSafeCommand(e =>
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e.UpdateTags(book.AudibleProductId, book.UserDefinedItem.Tags)
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);
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internal static void UpdateUserRatings(Book book) => performSafeCommand(e =>
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e.UpdateUserRatings(book)
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);
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private static void performSafeCommand(Action<SearchEngine> action)
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{
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try
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{
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update(action);
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}
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catch (FileNotFoundException)
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{
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fullReIndex(new SearchEngine());
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update(action);
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}
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}
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private static void update(Action<SearchEngine> action)
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{
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if (action is null)
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return;
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// support nesting incl recursion
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var prevIsUpdating = isUpdating;
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try
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{
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isUpdating = true;
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action(new SearchEngine());
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if (!prevIsUpdating)
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SearchEngineUpdated?.Invoke(null, null);
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}
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finally
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{
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isUpdating = prevIsUpdating;
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}
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}
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private static void fullReIndex(SearchEngine engine)
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{
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var library = DbContexts.GetLibrary_Flat_NoTracking();
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engine.CreateNewIndex(library);
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}
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#endregion
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}
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}
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