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// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
namespace System.Data.Entity.Config
{
using System.Collections.Concurrent;
using System.Linq;
using Moq;
using Xunit;
public class CachingDependencyResolverTests : TestBase
{
public interface IPilkington
{
}
public interface IGervais
{
}
[Fact]
public void GetService_caches_the_result_from_the_underlying_resolver_for_a_given_type_name_pair()
{
var mockResolver = new Mock<IDbDependencyResolver>();
var cachingResolver = new CachingDependencyResolver(mockResolver.Object);
VerifyServiceIsCached(new Mock<IPilkington>().Object, cachingResolver, mockResolver, "Foo");
VerifyServiceIsCached(new Mock<IPilkington>().Object, cachingResolver, mockResolver, "Bar");
VerifyServiceIsCached(new Mock<IPilkington>().Object, cachingResolver, mockResolver, null);
VerifyServiceIsCached(new Mock<IGervais>().Object, cachingResolver, mockResolver, "Foo");
VerifyServiceIsCached(new Mock<IGervais>().Object, cachingResolver, mockResolver, "Bar");
VerifyServiceIsCached(new Mock<IGervais>().Object, cachingResolver, mockResolver, null);
}
private static void VerifyServiceIsCached<T>(
T service,
CachingDependencyResolver cachingResolver,
Mock<IDbDependencyResolver> mockResolver,
string name)
{
mockResolver.Setup(m => m.GetService(typeof(T), name)).Returns(service);
Assert.Same(service, cachingResolver.GetService<T>(name));
mockResolver.Verify(m => m.GetService(typeof(T), name), Times.Once());
Assert.Same(service, cachingResolver.GetService<T>(name));
mockResolver.Verify(m => m.GetService(typeof(T), name), Times.Once()); // Underlying resolver not called again
}
[Fact]
public void A_service_that_resolves_to_null_is_still_cached()
{
var mockResolver = new Mock<IDbDependencyResolver>();
VerifyServiceIsCached<IPilkington>(null, new CachingDependencyResolver(mockResolver.Object), mockResolver, null);
}
/// <summary>
/// This test makes calls from multiple threads such that we have at least some chance of finding threading
/// issues. As with any test of this type just because the test passes does not mean that the code is
/// correct. On the other hand if this test ever fails (EVEN ONCE) then we know there is a problem to
/// be investigated. DON'T just re-run and think things are okay if the test then passes.
/// </summary>
[Fact]
public void GetService_can_be_accessed_from_multiple_threads_concurrently()
{
for (var i = 0; i < 30; i++)
{
var bag = new ConcurrentBag<IPilkington>();
var karl = new Mock<IPilkington>().Object;
var resolver = new CachingDependencyResolver(new SingletonDependencyResolver<IPilkington>(karl));
ExecuteInParallel(() => bag.Add(resolver.GetService<IPilkington>()));
Assert.Equal(20, bag.Count);
Assert.True(bag.All(c => karl == c));
}
}
}
}
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