Concurrently retrieving configuration/localization info in `MvcCachedApplicationConfigurationClient`.

framework/Volo.Abp.slnx

@@ -181,6 +181,7 @@
     <Project Path="test/Volo.Abp.AspNetCore.Mvc.UI.Tests/Volo.Abp.AspNetCore.Mvc.UI.Tests.csproj" />
     <Project Path="test/Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared.Tests/Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared.Tests.csproj" />
     <Project Path="test/Volo.Abp.AspNetCore.Mvc.Versioning.Tests/Volo.Abp.AspNetCore.Mvc.Versioning.Tests.csproj" />
+    <Project Path="test/Volo.Abp.AspNetCore.Mvc.Client.Tests/Volo.Abp.AspNetCore.Mvc.Client.Tests.csproj" />
     <Project Path="test/Volo.Abp.AspNetCore.Serilog.Tests/Volo.Abp.AspNetCore.Serilog.Tests.csproj" />
     <Project Path="test/Volo.Abp.AspNetCore.SignalR.Tests/Volo.Abp.AspNetCore.SignalR.Tests.csproj" />
     <Project Path="test/Volo.Abp.AspNetCore.Tests/Volo.Abp.AspNetCore.Tests.csproj" />

framework/src/Volo.Abp.AspNetCore.Mvc.Client/Volo/Abp/AspNetCore/Mvc/Client/MvcCachedApplicationConfigurationClient.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Globalization;
 using Microsoft.AspNetCore.Http;
 using System.Threading.Tasks;
 using Microsoft.Extensions.Caching.Distributed;
@@ -84,20 +85,43 @@ public class MvcCachedApplicationConfigurationClient : ICachedApplicationConfigu
 
     private async Task<ApplicationConfigurationDto> GetRemoteConfigurationAsync()
     {
-        var config = await ApplicationConfigurationAppService.GetAsync(
+        var cultureName = CultureInfo.CurrentUICulture.Name;
+
+        var configTask = ApplicationConfigurationAppService.GetAsync(
             new ApplicationConfigurationRequestOptions
             {
                 IncludeLocalizationResources = false
             }
         );
 
-        var localizationDto = await ApplicationLocalizationClientProxy.GetAsync(
+        var localizationTask = ApplicationLocalizationClientProxy.GetAsync(
-            new ApplicationLocalizationRequestDto {
+            new ApplicationLocalizationRequestDto
-                CultureName = config.Localization.CurrentCulture.Name,
+            {
+                CultureName = cultureName,
                 OnlyDynamics = true
             }
         );
 
+        var config = await configTask;
+
+        ApplicationLocalizationDto localizationDto;
+        // In most cases, the culture matches and we can reuse the concurrent request.
+        // If not, we discard it and make a new request with the correct culture.
+        if (string.Equals(config.Localization.CurrentCulture.Name, cultureName, StringComparison.OrdinalIgnoreCase))
+        {
+            localizationDto = await localizationTask;
+        }
+        else
+        {
+            localizationDto = await ApplicationLocalizationClientProxy.GetAsync(
+                new ApplicationLocalizationRequestDto
+                {
+                    CultureName = config.Localization.CurrentCulture.Name,
+                    OnlyDynamics = true
+                }
+            );
+        }
+
         config.Localization.Resources = localizationDto.Resources;
 
         return config;

framework/test/Volo.Abp.AspNetCore.Mvc.Client.Tests/Volo.Abp.AspNetCore.Mvc.Client.Tests.csproj

@@ -0,0 +1,17 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <Import Project="..\..\..\common.test.props" />
+
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <RootNamespace />
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\src\Volo.Abp.AspNetCore.Mvc.Client\Volo.Abp.AspNetCore.Mvc.Client.csproj" />
+    <ProjectReference Include="..\..\src\Volo.Abp.Autofac\Volo.Abp.Autofac.csproj" />
+    <ProjectReference Include="..\AbpTestBase\AbpTestBase.csproj" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" />
+  </ItemGroup>
+
+</Project>

framework/test/Volo.Abp.AspNetCore.Mvc.Client.Tests/Volo/Abp/AspNetCore/Mvc/Client/AbpAspNetCoreMvcClientTestBase.cs

@@ -0,0 +1,11 @@
+using Volo.Abp.Testing;
+
+namespace Volo.Abp.AspNetCore.Mvc.Client;
+
+public abstract class AbpAspNetCoreMvcClientTestBase : AbpIntegratedTest<AbpAspNetCoreMvcClientTestModule>
+{
+    protected override void SetAbpApplicationCreationOptions(AbpApplicationCreationOptions options)
+    {
+        options.UseAutofac();
+    }
+}

framework/test/Volo.Abp.AspNetCore.Mvc.Client.Tests/Volo/Abp/AspNetCore/Mvc/Client/AbpAspNetCoreMvcClientTestModule.cs

@@ -0,0 +1,17 @@
+using Microsoft.Extensions.DependencyInjection;
+using Volo.Abp.Autofac;
+using Volo.Abp.Modularity;
+
+namespace Volo.Abp.AspNetCore.Mvc.Client;
+
+[DependsOn(
+    typeof(AbpAspNetCoreMvcClientModule),
+    typeof(AbpAutofacModule)
+)]
+public class AbpAspNetCoreMvcClientTestModule : AbpModule
+{
+    public override void ConfigureServices(ServiceConfigurationContext context)
+    {
+        context.Services.AddHttpContextAccessor();
+    }
+}

framework/test/Volo.Abp.AspNetCore.Mvc.Client.Tests/Volo/Abp/AspNetCore/Mvc/Client/MvcCachedApplicationConfigurationClient_Tests.cs

@@ -0,0 +1,90 @@
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.DependencyInjection.Extensions;
+using NSubstitute;
+using Shouldly;
+using Volo.Abp.AspNetCore.Mvc.ApplicationConfigurations;
+using Volo.Abp.AspNetCore.Mvc.ApplicationConfigurations.ClientProxies;
+using Xunit;
+
+namespace Volo.Abp.AspNetCore.Mvc.Client;
+
+public class MvcCachedApplicationConfigurationClient_Tests : AbpAspNetCoreMvcClientTestBase
+{
+    private AbpApplicationConfigurationClientProxy _configProxy;
+    private AbpApplicationLocalizationClientProxy _localizationProxy;
+
+    private readonly ICachedApplicationConfigurationClient _applicationConfigurationClient;
+
+    public MvcCachedApplicationConfigurationClient_Tests()
+    {
+        _applicationConfigurationClient = GetRequiredService<ICachedApplicationConfigurationClient>();
+    }
+
+    protected override void AfterAddApplication(IServiceCollection services)
+    {
+        _configProxy = Substitute.For<AbpApplicationConfigurationClientProxy>();
+        _localizationProxy = Substitute.For<AbpApplicationLocalizationClientProxy>();
+
+        services.Replace(ServiceDescriptor.Transient(_ => _configProxy));
+        services.Replace(ServiceDescriptor.Transient(_ => _localizationProxy));
+    }
+
+    [Fact]
+    public async Task Should_Use_Concurrent_Requests_When_Culture_Matches()
+    {
+        var cultureName = "en";
+
+        _configProxy.GetAsync(Arg.Any<ApplicationConfigurationRequestOptions>()).Returns(CreateConfigDto(cultureName));
+
+        var expectedResources = new Dictionary<string, ApplicationLocalizationResourceDto>
+        {
+            ["TestResource"] = new()
+        };
+
+        _localizationProxy.GetAsync(Arg.Any<ApplicationLocalizationRequestDto>()).Returns(new ApplicationLocalizationDto { Resources = expectedResources });
+
+        var result = await _applicationConfigurationClient.GetAsync();
+
+        result.Localization.Resources.ShouldBe(expectedResources);
+
+        await _configProxy.Received(1).GetAsync(Arg.Is<ApplicationConfigurationRequestOptions>(x => x.IncludeLocalizationResources == false));
+        await _localizationProxy.Received(1).GetAsync(Arg.Is<ApplicationLocalizationRequestDto>(x => x.CultureName == cultureName && x.OnlyDynamics == true));
+    }
+
+    [Fact]
+    public async Task Should_Refetch_Localization_When_Culture_Differs()
+    {
+        var currentCulture = "en";
+        var serverCulture = "tr";
+
+        _configProxy.GetAsync(Arg.Any<ApplicationConfigurationRequestOptions>()).Returns(CreateConfigDto(serverCulture));
+
+        var wrongResources = new Dictionary<string, ApplicationLocalizationResourceDto>();
+        var correctResources = new Dictionary<string, ApplicationLocalizationResourceDto>
+        {
+            ["TestResource"] = new()
+        };
+
+        _localizationProxy.GetAsync(Arg.Is<ApplicationLocalizationRequestDto>(x => x.CultureName == currentCulture)).Returns(new ApplicationLocalizationDto { Resources = wrongResources });
+        _localizationProxy.GetAsync(Arg.Is<ApplicationLocalizationRequestDto>(x => x.CultureName == serverCulture)).Returns(new ApplicationLocalizationDto { Resources = correctResources });
+
+        var result = await _applicationConfigurationClient.GetAsync();
+
+        result.Localization.Resources.ShouldBe(correctResources);
+
+        await _localizationProxy.Received(1).GetAsync(Arg.Is<ApplicationLocalizationRequestDto>(x => x.CultureName == serverCulture));
+    }
+
+    private static ApplicationConfigurationDto CreateConfigDto(string cultureName)
+    {
+        return new ApplicationConfigurationDto
+        {
+            Localization =
+            {
+                CurrentCulture = new CurrentCultureDto { Name = cultureName }
+            }
+        };
+    }
+}