public async Task AddOrGetExistingAsync_ItemCached_ItemFactoryNotCalled()
{
// Arrange
var key = "this-is-the-key";
var value = "this-is-the-value";
var cacheItemPolicy = new CacheItemPolicy()
{
};
var isFactoryCalled = false;
var cachedLazy = new AsyncLazy <string>(() => Task.FromResult(value));
Func <Task <string> > func = () =>
{
isFactoryCalled = true;
return(Task.FromResult(value));
};
_cacheMock
.Setup(c => c.AddOrGetExisting(key, It.IsAny <AsyncLazy <string> >(), cacheItemPolicy, null))
.Returns(cachedLazy);
var cache = new AsyncCache(_cacheMock.Object);
// Act
var result = await cache.AddOrGetExistingAsync(key, func, cacheItemPolicy);
// Asserts
Assert.AreEqual(value, result);
Assert.IsFalse(isFactoryCalled);
_cacheMock.VerifyAll();
}
public async Task AddOrGetExistingAsync_ItemNotCached_ItemFactoryFailed_ExceptionRetrown()
{
// Arrange
var key = "this-is-the-key";
var cacheItemPolicy = new CacheItemPolicy()
{
};
Func <Task <string> > func = async() => {
await Task.Delay(1);
throw new ArgumentNullException();
};
_cacheMock
.Setup(c => c.AddOrGetExisting(key, It.IsAny <AsyncLazy <string> >(), cacheItemPolicy, null))
.Returns(null);
var cache = new AsyncCache(_cacheMock.Object);
// Act
var result = cache.AddOrGetExistingAsync(key, func, cacheItemPolicy);
// Asserts
try
{
await result;
Assert.Fail("ItemFactory fail is not raised");
}
catch (ArgumentNullException)
{
}
_cacheMock.Verify(c => c.Remove(key, null), Times.Once);
}
public async Task AddOrGetExistingAsync_SlidingExpiration_ItemNotCached_ItemFactoryCalledAndResultCached()
{
// Arrange
var key = "this-is-the-key";
var slidingExpiration = TimeSpan.FromMinutes(1);
_cacheMock
.Setup(c => c.AddOrGetExisting(key, It.IsAny <AsyncLazy <string> >(), It.Is <CacheItemPolicy>(policy => policy.SlidingExpiration == slidingExpiration), null))
.Returns(null);
var cache = new AsyncCache(_cacheMock.Object);
// Act
var result = await cache.AddOrGetExistingAsync(key, () => Task.FromResult("this-is-the-value"), slidingExpiration);
// Asserts
_cacheMock.VerifyAll();
}
public async Task AddOrGetExistingAsync_AbsoluteExpiration_ItemNotCached_ItemFactoryCalledAndResultCached()
{
// Arrange
var key = "this-is-the-key";
var absoluteExpiration = DateTime.UtcNow.AddSeconds(30);
_cacheMock
.Setup(c => c.AddOrGetExisting(key, It.IsAny <AsyncLazy <string> >(), It.Is <CacheItemPolicy>(policy => policy.AbsoluteExpiration == absoluteExpiration), null))
.Returns(null);
var cache = new AsyncCache(_cacheMock.Object);
// Act
var result = await cache.AddOrGetExistingAsync(key, () => Task.FromResult("this-is-the-value"), absoluteExpiration);
// Asserts
_cacheMock.VerifyAll();
}
public void AddOrGetExistingAsync_ItemNotCached_ParallelRequests()
{
const int parallelRequestsCount = 10;
int factoryCalls = 0;
using (var barrier = new Barrier(parallelRequestsCount + 1))
using (var memoryCache = new MemoryCache(nameof(AddOrGetExistingAsync_ItemNotCached_ParallelRequests)))
{
var asyncCache = new AsyncCache(memoryCache);
var key = "this-is-key";
for (int i = 0; i < parallelRequestsCount; i++)
{
string value = "Value " + i;
Task.Factory.StartNew(async() =>
{
barrier.SignalAndWait(500);
var resultValue = await asyncCache.AddOrGetExistingAsync(
key,
() =>
{
Interlocked.Increment(ref factoryCalls);
return(Task.FromResult(value));
},
DateTime.UtcNow.AddSeconds(30));
Assert.IsTrue(resultValue.StartsWith("Value", StringComparison.InvariantCulture));
barrier.SignalAndWait(500);
});
}
barrier.SignalAndWait(500);
// Threads will call Cache at that time
barrier.SignalAndWait(500);
}
Assert.AreEqual(1, factoryCalls);
}