New SortAndBind operator

.editorconfig

@@ -454,7 +454,7 @@ dotnet_diagnostic.SA1619.severity = error
 dotnet_diagnostic.SA1620.severity = error
 dotnet_diagnostic.SA1621.severity = error
 dotnet_diagnostic.SA1622.severity = error
-dotnet_diagnostic.SA1623.severity = error
+dotnet_diagnostic.SA1623.severity = none
 dotnet_diagnostic.SA1624.severity = error
 dotnet_diagnostic.SA1625.severity = error
 dotnet_diagnostic.SA1626.severity = error
@@ -495,7 +495,7 @@ dotnet_diagnostic.RCS1242.severity=error
 dotnet_diagnostic.CA2016.severity=warning
 dotnet_diagnostic.CA2014.severity=error
 dotnet_diagnostic.RCS1010.severity=error
-dotnet_diagnostic.RCS1006.severity=error
+dotnet_diagnostic.RCS1006.severity=suggestion
 dotnet_diagnostic.RCS1005.severity=error
 dotnet_diagnostic.RCS1020.severity=error
 dotnet_diagnostic.RCS1049.severity=warning

src/DynamicData.Benchmarks/Cache/SortAndBindChange.cs

@@ -0,0 +1,111 @@
+using System;
+using System.Collections.ObjectModel;
+using System.Linq;
+using System.Reactive.Disposables;
+using System.Reactive.Subjects;
+using BenchmarkDotNet.Attributes;
+using DynamicData.Binding;
+
+namespace DynamicData.Benchmarks.Cache;
+
+[MemoryDiagnoser]
+[MarkdownExporterAttribute.GitHub]
+public class SortAndBindChange: IDisposable
+{
+    private readonly Random _random = new();
+    private record Item(string Name, int Id, int Ranking);
+
+    private readonly SortExpressionComparer<Item> _comparer = SortExpressionComparer<Item>
+        .Ascending(i => i.Ranking)
+        .ThenByAscending(i => i.Name);
+
+
+    Subject<IChangeSet<Item, int>> _newSubject = new();
+    Subject<IChangeSet<Item, int>> _newSubjectOptimised = new();
+    Subject<IChangeSet<Item, int>> _oldSubject = new();
+    Subject<IChangeSet<Item, int>> _oldSubjectOptimised = new();
+
+    private IDisposable? _cleanUp;
+
+    private ReadOnlyObservableCollection<Item>? _newList;
+    private ReadOnlyObservableCollection<Item>? _newListOptimised;
+    private ReadOnlyObservableCollection<Item>? _oldList;
+    private ReadOnlyObservableCollection<Item>? _oldListOptimised;
+
+
+
+    [Params(10, 100, 1_000, 10_000, 50_000)]
+    public int Count { get; set; }
+
+
+    [GlobalSetup]
+    public void SetUp()
+    {
+        _oldSubject = new Subject<IChangeSet<Item, int>>();
+        _oldSubjectOptimised = new Subject<IChangeSet<Item, int>>();
+        _newSubject = new Subject<IChangeSet<Item, int>>();
+        _newSubjectOptimised = new Subject<IChangeSet<Item, int>>();
+
+
+        _cleanUp = new CompositeDisposable  
+        (
+            _newSubject.SortAndBind(out var newList, _comparer).Subscribe(),
+            _newSubjectOptimised.SortAndBind(out var optimisedList, _comparer, new SortAndBindOptions
+            {
+                InitialCapacity = Count,
+                UseBinarySearch = true
+            }).Subscribe(),
+
+            _oldSubject.Sort(_comparer).Bind(out var oldList).Subscribe(),
+            _oldSubjectOptimised.Sort(_comparer, SortOptimisations.ComparesImmutableValuesOnly).Bind(out var oldOptimisedList).Subscribe()
+        );
+
+        _newList = newList;
+        _newListOptimised = optimisedList;
+        _oldList = oldList;
+        _oldListOptimised = oldOptimisedList;
+
+
+
+        var changeSet = new ChangeSet<Item, int>(Count);
+        foreach (var i in Enumerable.Range(1, Count))
+        {
+            var item = new Item($"Item{i}", i, _random.Next(1, 1000));
+            changeSet.Add(new Change<Item, int>(ChangeReason.Add, i, item));
+        }
+
+        _newSubject.OnNext(changeSet);
+        _newSubjectOptimised.OnNext(changeSet);
+        _oldSubject.OnNext(changeSet);
+        _oldSubjectOptimised.OnNext(changeSet);
+
+    }
+
+    [Benchmark(Baseline = true)]
+    public void Old() => RunTest(_oldSubject, _oldList!);
+
+
+    [Benchmark]
+    public void OldOptimized() => RunTest(_oldSubjectOptimised, _oldListOptimised!);
+
+    [Benchmark]
+    public void New() => RunTest(_newSubject, _newList!);
+
+    [Benchmark]
+    public void NewOptimized() => RunTest(_newSubjectOptimised, _newListOptimised!);
+
+
+    void RunTest(Subject<IChangeSet<Item, int>> subject, ReadOnlyObservableCollection<Item> list)
+    {
+        var original = list[Count / 2];
+        var updated = original with { Ranking = _random.Next(1, 1000) };
+
+        subject.OnNext(new ChangeSet<Item, int>
+        {
+            new(ChangeReason.Update, original.Id, updated, original)
+        });
+    }
+
+
+    public void Dispose() => _cleanUp?.Dispose();
+}

src/DynamicData.Benchmarks/Cache/SortAndBindInitial.cs

@@ -0,0 +1,81 @@
+using BenchmarkDotNet.Attributes;
+using System;
+using System.Linq;
+using System.Reactive.Disposables;
+using System.Reactive.Subjects;
+using DynamicData.Binding;
+
+namespace DynamicData.Benchmarks.Cache;
+
+[MemoryDiagnoser]
+[MarkdownExporterAttribute.GitHub]
+public class SortAndBindInitial: IDisposable
+{
+    private readonly Random _random = new();
+
+    private record Item(string Name, int Id, int Ranking);
+
+    private readonly SortExpressionComparer<Item> _comparer = SortExpressionComparer<Item>.Ascending(i => i.Ranking).ThenByAscending(i => i.Name);
+
+
+    Subject<IChangeSet<Item, int>> _newSubject = new();
+    Subject<IChangeSet<Item, int>> _newSubjectOptimised = new();
+    Subject<IChangeSet<Item, int>> _oldSubject = new();
+    Subject<IChangeSet<Item, int>> _oldSubjectOptimised = new();
+
+    private IDisposable? _cleanUp;
+    private ChangeSet<Item, int>? _changeSet;
+
+
+    [Params(10, 100, 1_000, 10_000, 50_000)]
+    public int Count { get; set; }
+
+
+    [GlobalSetup]
+    public void SetUp()
+    {
+        _oldSubject = new Subject<IChangeSet<Item, int>>();
+        _oldSubjectOptimised = new Subject<IChangeSet<Item, int>>();
+        _newSubject = new Subject<IChangeSet<Item, int>>();
+        _newSubjectOptimised = new Subject<IChangeSet<Item, int>>();
+
+        var changeSet = new ChangeSet<Item, int>(Count);
+        foreach (var i in Enumerable.Range(1, Count))
+        {
+            var item = new Item($"Item{i}", i, _random.Next(1, 1000));
+            changeSet.Add(new Change<Item, int>(ChangeReason.Add, i, item));
+        }
+
+        _changeSet = changeSet;
+
+        _cleanUp = new CompositeDisposable
+        (
+            _newSubject.SortAndBind(out var newList, _comparer).Subscribe(),
+            _newSubjectOptimised.SortAndBind(out var optimisedList, _comparer, new SortAndBindOptions
+            {
+                InitialCapacity = Count,
+                UseBinarySearch = true
+            }).Subscribe(),
+
+            _oldSubject.Sort(_comparer).Bind(out var oldList).Subscribe(),
+            _oldSubjectOptimised.Sort(_comparer, SortOptimisations.ComparesImmutableValuesOnly).Bind(out var oldOptimisedList).Subscribe()
+
+        );
+    }
+
+
+    [Benchmark(Baseline = true)]
+    public void Old() => _oldSubject.OnNext(_changeSet!);
+
+    [Benchmark]
+    public void OldOptimized() => _oldSubjectOptimised.OnNext(_changeSet!);
+
+    [Benchmark]
+    public void New() => _newSubject.OnNext(_changeSet!);
+
+    [Benchmark]
+    public void NewOptimized() => _newSubjectOptimised.OnNext(_changeSet!);
+
+
+    public void Dispose() => _cleanUp?.Dispose();
+}

src/DynamicData.Benchmarks/DynamicData.Benchmarks.csproj

@@ -22,4 +22,7 @@
   <ItemGroup>
     <None Include="BenchmarkDotNet.Artifacts\**\*" />
   </ItemGroup>
+  <ItemGroup>
+    <Folder Include="BenchmarkDotNet.Artifacts\" />
+  </ItemGroup>
 </Project>

src/DynamicData.Benchmarks/Program.cs

@@ -23,4 +23,4 @@ public static void Main(string[] args)
         private static string GetProjectRootDirectory([CallerFilePath] string? callerFilePath = null)
             => Path.GetDirectoryName(callerFilePath)!;
     }
-}
+}

src/DynamicData.Tests/API/ApiApprovalTests.DynamicDataTests.DotNet8_0.verified.txt

@@ -469,6 +469,14 @@ namespace DynamicData.Binding
         public static bool operator !=(DynamicData.Binding.PropertyValue<TObject, TValue>? left, DynamicData.Binding.PropertyValue<TObject, TValue>? right) { }
         public static bool operator ==(DynamicData.Binding.PropertyValue<TObject, TValue>? left, DynamicData.Binding.PropertyValue<TObject, TValue>? right) { }
     }
+    public struct SortAndBindOptions : System.IEquatable<DynamicData.Binding.SortAndBindOptions>
+    {
+        public SortAndBindOptions() { }
+        public int InitialCapacity { get; init; }
+        public int ResetThreshold { get; init; }
+        public bool UseBinarySearch { get; init; }
+        public bool UseReplaceForUpdates { get; init; }
+    }
     public enum SortDirection
     {
         Ascending = 0,
@@ -700,6 +708,7 @@ namespace DynamicData
     public static class DynamicDataOptions
     {
         public static DynamicData.Binding.BindingOptions Binding { get; set; }
+        public static DynamicData.Binding.SortAndBindOptions SortAndBind { get; set; }
     }
     public static class EnumerableEx
     {
@@ -1751,6 +1760,18 @@ namespace DynamicData
         public static System.IObservable<DynamicData.ISortedChangeSet<TObject, TKey>> Sort<TObject, TKey>(this System.IObservable<DynamicData.IChangeSet<TObject, TKey>> source, System.IObservable<System.Collections.Generic.IComparer<TObject>> comparerObservable, System.IObservable<System.Reactive.Unit> resorter, DynamicData.SortOptimisations sortOptimisations = 0, int resetThreshold = 100)
             where TObject :  notnull
             where TKey :  notnull { }
+        public static System.IObservable<DynamicData.IChangeSet<TObject, TKey>> SortAndBind<TObject, TKey>(this System.IObservable<DynamicData.IChangeSet<TObject, TKey>> source, System.Collections.Generic.IList<TObject> targetList, System.Collections.Generic.IComparer<TObject> comparer)
+            where TObject :  notnull
+            where TKey :  notnull { }
+        public static System.IObservable<DynamicData.IChangeSet<TObject, TKey>> SortAndBind<TObject, TKey>(this System.IObservable<DynamicData.IChangeSet<TObject, TKey>> source, out System.Collections.ObjectModel.ReadOnlyObservableCollection<TObject> readOnlyObservableCollection, System.Collections.Generic.IComparer<TObject> comparer)
+            where TObject :  notnull
+            where TKey :  notnull { }
+        public static System.IObservable<DynamicData.IChangeSet<TObject, TKey>> SortAndBind<TObject, TKey>(this System.IObservable<DynamicData.IChangeSet<TObject, TKey>> source, System.Collections.Generic.IList<TObject> targetList, System.Collections.Generic.IComparer<TObject> comparer, DynamicData.Binding.SortAndBindOptions options)
+            where TObject :  notnull
+            where TKey :  notnull { }
+        public static System.IObservable<DynamicData.IChangeSet<TObject, TKey>> SortAndBind<TObject, TKey>(this System.IObservable<DynamicData.IChangeSet<TObject, TKey>> source, out System.Collections.ObjectModel.ReadOnlyObservableCollection<TObject> readOnlyObservableCollection, System.Collections.Generic.IComparer<TObject> comparer, DynamicData.Binding.SortAndBindOptions options)
+            where TObject :  notnull
+            where TKey :  notnull { }
         public static System.IObservable<DynamicData.ISortedChangeSet<TObject, TKey>> SortBy<TObject, TKey>(this System.IObservable<DynamicData.IChangeSet<TObject, TKey>> source, System.Func<TObject, System.IComparable> expression, DynamicData.Binding.SortDirection sortOrder = 0, DynamicData.SortOptimisations sortOptimisations = 0, int resetThreshold = 100)
             where TObject :  notnull
             where TKey :  notnull { }