Remove old dotnet-core feed

nuget.config

@@ -3,7 +3,6 @@
   <packageSources>
     <clear />
     <add key="nuget.org" value="https://api.nuget.org/v3/index.json" />
-    <add key="dotnet-core" value="https://dotnetfeed.blob.core.windows.net/dotnet-core/index.json" />
     <add key="dotnet7" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet7/nuget/v3/index.json" />
     <add key="dotnet8" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet8/nuget/v3/index.json" />
     <add key="dotnet9" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet9/nuget/v3/index.json" />

test/Grpc.Net.Client.Tests/Balancer/ConnectivityStateTests.cs

@@ -1,4 +1,4 @@
-#region Copyright notice and license
+#region Copyright notice and license
 
 // Copyright 2019 The gRPC Authors
 //
@@ -29,6 +29,7 @@
 using Grpc.Net.Client.Tests.Infrastructure.Balancer;
 using Grpc.Tests.Shared;
 using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Logging;
 using NUnit.Framework;
 
 namespace Grpc.Net.Client.Tests.Balancer;
@@ -52,11 +53,13 @@ public async Task ResolverReturnsNoAddresses_CallWithWaitForReady_Wait()
         });
 
         var services = new ServiceCollection();
+        services.AddNUnitLogger();
         services.AddSingleton<TestResolver>();
         services.AddSingleton<ResolverFactory, TestResolverFactory>();
         services.AddSingleton<ISubchannelTransportFactory>(new TestSubchannelTransportFactory());
         var serviceProvider = services.BuildServiceProvider();
 
+        var logger = serviceProvider.GetRequiredService<ILogger<ConnectivityStateTests>>();
         var invoker = HttpClientCallInvokerFactory.Create(testMessageHandler, "test:///localhost", configure: o =>
         {
             o.Credentials = ChannelCredentials.Insecure;
@@ -72,6 +75,8 @@ public async Task ResolverReturnsNoAddresses_CallWithWaitForReady_Wait()
         Assert.IsNull(authority);
 
         var resolver = serviceProvider.GetRequiredService<TestResolver>();
+
+        logger.LogInformation("UpdateAddresses");
         resolver.UpdateAddresses(new List<BalancerAddress>
         {
             new BalancerAddress("localhost", 81)

test/Shared/TestResolver.cs

@@ -32,6 +32,7 @@ namespace Grpc.Tests.Shared;
 
 internal class TestResolver : PollingResolver
 {
+    private readonly object _lock;
     private readonly Func<Task>? _onRefreshAsync;
     private readonly TaskCompletionSource<object?> _hasResolvedTcs;
     private readonly ILogger _logger;
@@ -45,6 +46,7 @@ public TestResolver(ILoggerFactory loggerFactory) : this(loggerFactory, null)
 
     public TestResolver(ILoggerFactory? loggerFactory = null, Func<Task>? onRefreshAsync = null) : base(loggerFactory ?? NullLoggerFactory.Instance)
     {
+        _lock = new object();
         _onRefreshAsync = onRefreshAsync;
         _hasResolvedTcs = new TaskCompletionSource<object?>(TaskCreationOptions.RunContinuationsAsynchronously);
         _logger = (ILogger?)loggerFactory?.CreateLogger<TestResolver>() ?? NullLogger.Instance;
@@ -64,8 +66,11 @@ public void UpdateError(Status status)
 
     public void UpdateResult(ResolverResult result)
     {
-        _result = result;
-        Listener?.Invoke(result);
+        lock (_lock)
+        {
+            _result = result;
+            Listener?.Invoke(result);
+        }
     }
 
     protected override async Task ResolveAsync(CancellationToken cancellationToken)
@@ -75,7 +80,10 @@ protected override async Task ResolveAsync(CancellationToken cancellationToken)
             await _onRefreshAsync();
         }
 
-        Listener(_result ?? ResolverResult.ForResult(Array.Empty<BalancerAddress>(), serviceConfig: null, serviceConfigStatus: null));
+        lock (_lock)
+        {
+            Listener(_result ?? ResolverResult.ForResult(Array.Empty<BalancerAddress>(), serviceConfig: null, serviceConfigStatus: null));
+        }
         _hasResolvedTcs.TrySetResult(null);
     }
 }