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Optimize tag persistence

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This commit is contained in:
Robert McRackan 2019-11-27 15:36:34 -05:00
parent 5c81441f83
commit 0683e5f55b
5 changed files with 53 additions and 48 deletions
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59
DataLayer/UNTESTED/EfClasses/Book.cs
View File

@ -123,16 +123,10 @@ namespace DataLayer
ArgumentValidator.EnsureEnumerableNotNullOrEmpty(newContributors, nameof(newContributors));
// the edge cases of doing local-loaded vs remote-only got weird. just load it
if (_contributorsLink == null)
{
ArgumentValidator.EnsureNotNull(context, nameof(context));
if (!context.Entry(this).IsKeySet)
throw new InvalidOperationException("Could not add contributors");
if (_contributorsLink is null)
getEntry(context).Collection(s => s.ContributorsLink).Load();
context.Entry(this).Collection(s => s.ContributorsLink).Load();
}
var roleContributions = getContributions(role);
var roleContributions = getContributions(role);
var isIdentical = roleContributions.Select(c => c.Contributor).SequenceEqual(newContributors);
if (isIdentical)
return;
@ -140,7 +134,8 @@ namespace DataLayer
_contributorsLink.RemoveWhere(bc => bc.Role == role);
addNewContributors(newContributors, role);
}
private void addNewContributors(IEnumerable<Contributor> newContributors, Role role)
private void addNewContributors(IEnumerable<Contributor> newContributors, Role role)
{
byte order = 0;
var newContributionsEnum = newContributors.Select(c => new BookContributor(this, c, role, order++));
@ -155,6 +150,18 @@ namespace DataLayer
.ToList();
#endregion
private Microsoft.EntityFrameworkCore.ChangeTracking.EntityEntry<Book> getEntry(DbContext context)
{
ArgumentValidator.EnsureNotNull(context, nameof(context));
var entry = context.Entry(this);
if (!entry.IsKeySet)
throw new InvalidOperationException("Could not load a valid Book from database");
return entry;
}
#region series
private HashSet<SeriesBook> _seriesLink;
public IEnumerable<SeriesBook> SeriesLink => _seriesLink?.ToList();
@ -186,16 +193,10 @@ namespace DataLayer
// our add() is conditional upon what's already included in the collection.
// therefore if not loaded, a trip is required. might as well just load it
if (_seriesLink == null)
{
ArgumentValidator.EnsureNotNull(context, nameof(context));
if (!context.Entry(this).IsKeySet)
throw new InvalidOperationException("Could not add series");
if (_seriesLink is null)
getEntry(context).Collection(s => s.SeriesLink).Load();
context.Entry(this).Collection(s => s.SeriesLink).Load();
}
var singleSeriesBook = _seriesLink.SingleOrDefault(sb => sb.Series == series);
var singleSeriesBook = _seriesLink.SingleOrDefault(sb => sb.Series == series);
if (singleSeriesBook == null)
_seriesLink.Add(new SeriesBook(series, this, index));
else
@ -211,8 +212,7 @@ namespace DataLayer
public void AddSupplementDownloadUrl(string url)
{
// supplements are owned by Book, so no need to Load():
// OwnsMany: "Can only ever appear on navigation properties of other entity types.
// Are automatically loaded, and can only be tracked by a DbContext alongside their owner."
// Are automatically loaded, and can only be tracked by a DbContext alongside their owner.
ArgumentValidator.EnsureNotNullOrWhiteSpace(url, nameof(url));
@ -232,19 +232,12 @@ namespace DataLayer
}
public void UpdateCategory(Category category, DbContext context = null)
{
// since category is never null, nullity means it hasn't been loaded. non null means we're correctly loaded. just overwrite
if (Category != null)
{
Category = category;
return;
}
{
// since category is never null, nullity means it hasn't been loaded
if (Category is null)
getEntry(context).Reference(s => s.Category).Load();
if (context == null)
throw new Exception("need context");
context.Entry(this).Reference(s => s.Category).Load();
Category = category;
Category = category;
}
public override string ToString() => $"[{AudibleProductId}] {Title}";

6
DataLayer/UNTESTED/TagPersistenceInterceptor.cs
View File

@ -26,13 +26,13 @@ namespace DataLayer
private static void persistTags(List<EntityEntry> modifiedEntities)
{
var tagSets = modifiedEntities
var tagsCollection = modifiedEntities
.Select(e => e.Entity as UserDefinedItem)
// filter by null but NOT by blank. blank is the valid way to show the absence of tags
.Where(a => a != null)
.Select(t => (t.Book.AudibleProductId, t.Tags))
.ToList();
foreach (var t in tagSets)
FileManager.TagsPersistence.Save(t.Book.AudibleProductId, t.Tags);
FileManager.TagsPersistence.Save(tagsCollection);
}
}
}

25
DataLayer/_HowTo- EF Core.txt
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@ -7,15 +7,22 @@ nuget
Microsoft.EntityFrameworkCore.Tools (needed for using Package Manager Console)
Microsoft.EntityFrameworkCore.Sqlite
MIGRATIONS require standard, not core
using standard instead of core. edit 3 things in csproj
1of3: pluralize xml TargetFramework tag to TargetFrameworks
2of2: TargetFrameworks from: netstandard2.1
to: netcoreapp3.0;netstandard2.1
3of3: add
<PropertyGroup>
<GenerateRuntimeConfigurationFiles>true</GenerateRuntimeConfigurationFiles>
</PropertyGroup>
MIGRATIONS
require core, not standard
this can be a problem b/c standard and framework can only reference standard, not core
TO USE MIGRATIONS (core and/or standard)
add to csproj
<PropertyGroup>
<GenerateRuntimeConfigurationFiles>true</GenerateRuntimeConfigurationFiles>
</PropertyGroup>
TO USE MIGRATIONS AS *BOTH* CORE AND STANDARD
edit csproj
pluralize this xml tag
from: TargetFramework
to: TargetFrameworks
inside of TargetFrameworks
from: netstandard2.1
to: netcoreapp3.0;netstandard2.1
run. error
SQLite Error 1: 'no such table: Blogs'.

5
DataLayer/appsettings.json
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@ -3,7 +3,10 @@
"LibationContext_sqlserver": "Server=(LocalDb)\\MSSQLLocalDB;Database=DataLayer.LibationContext;Integrated Security=true;",
"LibationContext": "Data Source=LibationContext.db;Foreign Keys=False;",
"// on windows sqlite paths accept windows and/or unix slashes": "",
"// sqlite notes": "",
"// absolute path example": "Data Source=C:/foo/bar/sample.db",
"// relative path example": "Data Source=sample.db",
"// on windows: sqlite paths accept windows and/or unix slashes": "",
"MyTestContext": "Data Source=%DESKTOP%/sample.db"
}
}

6
FileManager/UNTESTED/TagsPersistence.cs
View File

@ -27,11 +27,13 @@ namespace FileManager
= Policy.Handle<Exception>()
.WaitAndRetry(new[] { TimeSpan.FromMilliseconds(100) });
public static void Save(string productId, string tags)
public static void Save(IEnumerable<(string productId, string tags)> tagsCollection)
{
ensureCache();
cache[productId] = tags;
// on initial reload, there's a huge benefit to adding to cache individually then updating the file only once
foreach ((string productId, string tags) in tagsCollection)
cache[productId] = tags;
lock (locker)
policy.Execute(() => File.WriteAllText(TagsFile, JsonConvert.SerializeObject(cache, Formatting.Indented)));