public async Task TestCacheLoadingAndHitsAsync()
{
var enumCache = new LazyStaticInMemoryCache <Type, ILookup <Enum, string> >();
var attempts = 5;
int runCount = 0, attemptCount = 0;
ILookup <Enum, string> cachedEnumDescriptions = null;
for (var x = 0; x < attempts; x++)
{
attemptCount++;
cachedEnumDescriptions = await enumCache.GetOrAddAsync(typeof(StarWarsEnum), (t) =>
{
runCount++;
var enumDescriptionLookup = GetEnumDescriptionsLookup <StarWarsEnum>();
//Simulate Async operation by returning the results as a Task!
return(Task.FromResult(enumDescriptionLookup));
});
}
Assert.IsNotNull(cachedEnumDescriptions);
Assert.AreEqual(attempts, attemptCount);
Assert.AreEqual(1, runCount);
Assert.AreEqual("Anakin Skywalker", cachedEnumDescriptions[StarWarsEnum.DarthVader].FirstOrDefault());
Assert.AreEqual("Luke Skywalker", cachedEnumDescriptions[StarWarsEnum.LukeSkywalker].FirstOrDefault());
Assert.AreEqual("Obi-Wan Kenobi", cachedEnumDescriptions[StarWarsEnum.ObiWanKenobi].FirstOrDefault());
Assert.AreEqual("R2-D2", cachedEnumDescriptions[StarWarsEnum.R2D2].FirstOrDefault());
Assert.AreEqual("C-3PO", cachedEnumDescriptions[StarWarsEnum.C3PO].FirstOrDefault());
}
public void TestCacheExceptions()
{
var enumCache = new LazyStaticInMemoryCache <Type, ILookup <Enum, string> >();
var attempts = 5;
int runCount = 0, attemptCount = 0;
ILookup <Enum, string> cachedEnumDescriptions = null;
for (var x = 0; x < attempts; x++)
{
attemptCount++;
try
{
cachedEnumDescriptions = enumCache.GetOrAdd(typeof(StarWarsEnum), (t) =>
{
runCount++;
throw new Exception("Intentionally fail within the value factory...");
});
}
catch
{
//DO NOTHING!
}
}
Assert.IsNull(cachedEnumDescriptions);
Assert.AreEqual(attempts, attemptCount);
//When exceptions are thrown then the value should never be cached so execution count should match the number of attempts!
Assert.AreEqual(attempts, runCount);
}
