Use global caching in JsonSerializerOptions (#64646)

* Use caching in Reflection.Emit member accessors

* Refactor JsonSerializerOptions caching & use shared caching contexts

* Update src/libraries/System.Text.Json/src/System/Text/Json/Serialization/Metadata/ReflectionEmitCachingMemberAccessor.Cache.cs

* address feedback

* tweak cache eviction constants

* Update src/libraries/System.Text.Json/src/System/Text/Json/Serialization/JsonSerializerOptions.Caching.cs

* minor refinements to cache eviction algorithm

* rename JsonSerializerOptions._context to _serializerContext

* ensure that the update handler clears the shared caching contexts

* fix remark

Author: eiriktsarpalis

src/libraries/System.Text.Json/src/System.Text.Json.csproj

@@ -121,6 +121,7 @@ System.Text.Json.Nodes.JsonValue</PackageDescription>
     <Compile Include="System\Text\Json\Serialization\JsonSerializer.Write.Element.cs" />
     <Compile Include="System\Text\Json\Serialization\JsonSerializer.Write.Node.cs" />
     <Compile Include="System\Text\Json\Serialization\JsonSerializerContext.cs" />
+    <Compile Include="System\Text\Json\Serialization\JsonSerializerOptions.Caching.cs" />
     <Compile Include="System\Text\Json\Serialization\ReferenceEqualsWrapper.cs" />
     <Compile Include="System\Text\Json\Serialization\ConverterStrategy.cs" />
     <Compile Include="System\Text\Json\Serialization\ConverterList.cs" />
@@ -247,6 +248,8 @@ System.Text.Json.Nodes.JsonValue</PackageDescription>
     <Compile Include="System\Text\Json\Serialization\Metadata\MemberAccessor.cs" />
     <Compile Include="System\Text\Json\Serialization\Metadata\ParameterRef.cs" />
     <Compile Include="System\Text\Json\Serialization\Metadata\PropertyRef.cs" />
+    <Compile Include="System\Text\Json\Serialization\Metadata\ReflectionEmitCachingMemberAccessor.Cache.cs" />
+    <Compile Include="System\Text\Json\Serialization\Metadata\ReflectionEmitCachingMemberAccessor.cs" />
     <Compile Include="System\Text\Json\Serialization\Metadata\ReflectionEmitMemberAccessor.cs" />
     <Compile Include="System\Text\Json\Serialization\Metadata\ReflectionMemberAccessor.cs" />
     <Compile Include="System\Text\Json\Serialization\MetadataPropertyName.cs" />

src/libraries/System.Text.Json/src/System/Text/Json/Serialization/Converters/JsonMetadataServicesConverter.cs

@@ -76,7 +76,7 @@ internal override bool OnTryWrite(Utf8JsonWriter writer, T value, JsonSerializer
             if (!state.SupportContinuation &&
                 jsonTypeInfo is JsonTypeInfo<T> info &&
                 info.SerializeHandler != null &&
-                info.Options._context?.CanUseSerializationLogic == true)
+                info.Options._serializerContext?.CanUseSerializationLogic == true)
             {
                 info.SerializeHandler(writer, value);
                 return true;

src/libraries/System.Text.Json/src/System/Text/Json/Serialization/JsonSerializer.Helpers.cs

@@ -18,12 +18,12 @@ private static JsonTypeInfo GetTypeInfo(JsonSerializerOptions? options, Type run
             Debug.Assert(runtimeType != null);
 
             options ??= JsonSerializerOptions.Default;
-            if (!options.IsInitializedForReflectionSerializer)
+            if (!JsonSerializerOptions.IsInitializedForReflectionSerializer)
             {
-                options.InitializeForReflectionSerializer();
+                JsonSerializerOptions.InitializeForReflectionSerializer();
             }
 
-            return options.GetOrAddClassForRootType(runtimeType);
+            return options.GetOrAddJsonTypeInfoForRootType(runtimeType);
         }
 
         private static JsonTypeInfo GetTypeInfo(JsonSerializerContext context, Type type)

src/libraries/System.Text.Json/src/System/Text/Json/Serialization/JsonSerializer.Read.Stream.cs

@@ -287,9 +287,9 @@ public static partial class JsonSerializer
             CancellationToken cancellationToken = default)
         {
             options ??= JsonSerializerOptions.Default;
-            if (!options.IsInitializedForReflectionSerializer)
+            if (!JsonSerializerOptions.IsInitializedForReflectionSerializer)
             {
-                options.InitializeForReflectionSerializer();
+                JsonSerializerOptions.InitializeForReflectionSerializer();
             }
 
             return CreateAsyncEnumerableDeserializer(utf8Json, options, cancellationToken);

src/libraries/System.Text.Json/src/System/Text/Json/Serialization/JsonSerializer.Write.Helpers.cs

@@ -41,7 +41,7 @@ private static void WriteUsingGeneratedSerializer<TValue>(Utf8JsonWriter writer,
 
             if (jsonTypeInfo.HasSerialize &&
                 jsonTypeInfo is JsonTypeInfo<TValue> typedInfo &&
-                typedInfo.Options._context?.CanUseSerializationLogic == true)
+                typedInfo.Options._serializerContext?.CanUseSerializationLogic == true)
             {
                 Debug.Assert(typedInfo.SerializeHandler != null);
                 typedInfo.SerializeHandler(writer, value);
@@ -59,8 +59,8 @@ private static void WriteUsingSerializer<TValue>(Utf8JsonWriter writer, in TValu
 
             Debug.Assert(!jsonTypeInfo.HasSerialize ||
                 jsonTypeInfo is not JsonTypeInfo<TValue> ||
-                jsonTypeInfo.Options._context == null ||
-                !jsonTypeInfo.Options._context.CanUseSerializationLogic,
+                jsonTypeInfo.Options._serializerContext == null ||
+                !jsonTypeInfo.Options._serializerContext.CanUseSerializationLogic,
                 "Incorrect method called. WriteUsingGeneratedSerializer() should have been called instead.");
 
             WriteStack state = default;

src/libraries/System.Text.Json/src/System/Text/Json/Serialization/JsonSerializerContext.cs

@@ -30,7 +30,7 @@ public JsonSerializerOptions Options
                 if (_options == null)
                 {
                     _options = new JsonSerializerOptions();
-                    _options._context = this;
+                    _options._serializerContext = this;
                 }
 
                 return _options;
@@ -97,13 +97,13 @@ protected JsonSerializerContext(JsonSerializerOptions? options)
         {
             if (options != null)
             {
-                if (options._context != null)
+                if (options._serializerContext != null)
                 {
                     ThrowHelper.ThrowInvalidOperationException_JsonSerializerOptionsAlreadyBoundToContext();
                 }
 
                 _options = options;
-                options._context = this;
+                options._serializerContext = this;
             }
         }