Merge pull request #328 from microsoft/bugfix/backing-store-perf

fix: performance issue with InMemoryBackingStore

Author: baywet

CHANGELOG.md

@@ -7,6 +7,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [1.11.2] - 2024-08-14
+
+### Changed
+
+- Fixed an additional performance regression with the backing store introduced in version 1.9.2 by #243
+
 ## [1.11.1] - 2024-08-12
 
 ### Changed

Directory.Build.props

@@ -1,7 +1,7 @@
 <Project>
   <!-- Common default project properties for ALL projects-->
   <PropertyGroup>
-    <VersionPrefix>1.11.1</VersionPrefix>
+    <VersionPrefix>1.11.2</VersionPrefix>
     <VersionSuffix></VersionSuffix>
     <!-- This is overidden in test projects by setting to true-->
     <IsTestProject>false</IsTestProject>

src/abstractions/store/InMemoryBackingStore.cs

@@ -81,14 +81,13 @@ public void Set<T>(string key, T? value)
                 // All the list items are dirty as the model has been touched.
                 foreach(var item in collectionValues)
                 {
-                    if(item is IBackedModel model)
+                    // we don't support heterogeneous collections, so we can break if the first item is not a IBackedModel
+                    if(item is not IBackedModel model) break;
+                    model.BackingStore.InitializationCompleted = false;
+                    model.BackingStore.Subscribe((keyString, oldObject, newObject) =>
                     {
-                        model.BackingStore.InitializationCompleted = false;
-                        model.BackingStore.Subscribe((keyString, oldObject, newObject) =>
-                        {
-                            Set(key, value);
-                        }, key); // use property name(key) as subscriptionId to prevent excess subscription creation in the event this is called again
-                    }
+                        Set(key, value);
+                    }, key); // use property name(key) as subscriptionId to prevent excess subscription creation in the event this is called again
                 }
             }
 

tests/abstractions/Store/InMemoryBackingStoreTests.cs

@@ -475,12 +475,15 @@ public void TestsLargeArrayPerformsWell()
             var testBackingStore = new InMemoryBackingStore();
             // Act
             Assert.Empty(testBackingStore.Enumerate());
-            testBackingStore.Set("email", _testArray);
             var stopWatch = Stopwatch.StartNew();
+            testBackingStore.Set("email", _testArray);
+            stopWatch.Stop();
+            Assert.InRange(stopWatch.ElapsedMilliseconds, 0, 1);
+            stopWatch.Restart();
             testBackingStore.InitializationCompleted = true;
             stopWatch.Stop();
             // Assert
-            Assert.InRange(stopWatch.ElapsedMilliseconds, 0, 2);
+            Assert.InRange(stopWatch.ElapsedMilliseconds, 0, 1);
         }
 
         /// <summary>