public async Task Invalidates_cache_per_method()
{
// setup
var testMessageHandler = new TestMessageHandler();
var handler = new InMemoryCacheHandler(testMessageHandler);
var client = new HttpClient(handler);
// execute with two methods, and clean up one cache
var uri = new Uri("http://unittest");
await client.GetAsync(uri);
await client.SendAsync(new HttpRequestMessage(HttpMethod.Head, uri));
testMessageHandler.NumberOfCalls.Should().Be(2);
// clean cache
handler.InvalidateCache(uri, HttpMethod.Head);
// execute both actions, and only one should be retrieved from cache
await client.GetAsync(uri);
await client.SendAsync(new HttpRequestMessage(HttpMethod.Head, uri));
testMessageHandler.NumberOfCalls.Should().Be(3);
}
public async Task Tests_cache_invalidation()
{
const string url = "http://thecatapi.com/api/images/get?format=html";
var handler = new InMemoryCacheHandler(new HttpClientHandler(), CacheExpirationProvider.CreateSimple(TimeSpan.FromSeconds(60), TimeSpan.FromSeconds(10), TimeSpan.FromSeconds(5)));
using (var client = new HttpClient(handler))
{
for (int i = 0; i < 5; i++)
{
var sw = Stopwatch.StartNew();
Debug.Write($"Getting data from {url}, iteration #{i + 1}...");
var result = await client.GetAsync(url);
var content = await result.Content.ReadAsStringAsync();
Debug.WriteLine($" completed in {sw.ElapsedMilliseconds}ms. Content was {content}.");
if (i % 2 == 0)
{
Debug.WriteLine($"Iteration {i}. Invalidating cache.");
handler.InvalidateCache(new Uri(url));
}
}
}
StatsResult stats = handler.StatsProvider.GetStatistics();
stats.Total.CacheHit.Should().Be(2);
stats.Total.CacheMiss.Should().Be(3);
}
public async Task Invalidates_cache_correctly()
{
// setup
var testMessageHandler = new TestMessageHandler();
var handler = new InMemoryCacheHandler(testMessageHandler);
var client = new HttpClient(handler);
// execute twice, with cache invalidation in between
var uri = new Uri("http://unittest");
await client.GetAsync(uri);
handler.InvalidateCache(uri);
await client.GetAsync(uri);
// validate
testMessageHandler.NumberOfCalls.Should().Be(2);
}