public void CanCreateWithCacheNameAndInstanceName()
{
var cache = new SimpleInmemoryCache("SomeCache.Instance1");
Assert.That(cache.Id.Name, Is.EqualTo("SomeCache"), "CacheName");
Assert.That(cache.Id.InstanceName, Is.EqualTo("Instance1"), "InstanceName");
}
public void Demo_SimpleInmemoryCache_within_single_thread_constructor_called_only_once()
{
var cache = new SimpleInmemoryCache();
int ctorCallCount = 0;
Func <string, int> ctor = _ => {
Interlocked.Increment(ref ctorCallCount);
return(ctorCallCount);
};
cache.GetOrAdd("Key", ctor);
cache.GetOrAdd("Key", ctor);
Assert.That(ctorCallCount, Is.EqualTo(1));
}
Demo_SimpleInmemoryCache_two_threads_receiving_cache_misses_will_cause_constructor_to_be_run_twice()
{
var cache = new SimpleInmemoryCache();
int ctorCallCount = 0;
Func <string, int> slowCtor = _ => {
// slow down the first ctor call to ensure second thread always see the cache
// as empty even though this ctor has been called to add the item
Thread.Sleep(TimeSpan.FromMilliseconds(100));
Interlocked.Increment(ref ctorCallCount);
return(ctorCallCount);
};
Func <string, int> ctor = _ => {
Interlocked.Increment(ref ctorCallCount);
return(ctorCallCount);
};
Task <int> t1 = Task.Run(() => cache.GetOrAdd("Key", slowCtor));
Task <int> t2 = Task.Run(() => cache.GetOrAdd("Key", ctor));
await Task.WhenAll(t1, t2);
Assert.That(ctorCallCount, Is.EqualTo(2));
}
