public void Cache_can_be_cleared()
{
var item = new Item();
var key = item.Id;
var factoryMock = new Mock <Func <Item> >();
factoryMock.Setup(factory => factory()).Returns(item);
var cache = new MKCache <Item>();
var foundItem = cache.GetOrCreate(key, factoryMock.Object, Expiration);
factoryMock.Verify(factory => factory(), Times.Once);
Assert.Same(item, foundItem);
var cachedItem = cache.GetOrCreate(key, factoryMock.Object, Expiration);
factoryMock.Verify(factory => factory(), Times.Once);
Assert.Same(item, cachedItem);
cache.Clear();
var newlyCachedItem = cache.GetOrCreate(key, factoryMock.Object, Expiration);
factoryMock.Verify(factory => factory(), Times.Exactly(2));
Assert.Same(item, newlyCachedItem);
}
public async Task Cache_item_expires()
{
var cache = new MKCache <Item>();
var item = new Item();
var factoryMock = new Mock <Func <Item> >();
factoryMock.Setup(factory => factory()).Returns(item);
var expirySpan = TimeSpan.FromSeconds(1);
var foundItem = cache.GetOrCreate(item.Id, factoryMock.Object, expirySpan);
factoryMock.Verify(factory => factory(), Times.Once);
Assert.Same(item, foundItem);
var cachedItem = cache.GetOrCreate(item.Id, () => new Item(), expirySpan);
Assert.Same(item, cachedItem);
await Task.Delay(expirySpan * 3);
var newItem = cache.GetOrCreate(item.Id, factoryMock.Object, expirySpan);
factoryMock.Verify(factory => factory(), Times.Exactly(2));
}
public void An_item_is_cached_with_the_default_key()
{
var item = new Item();
var key = item.Id;
var factoryMock = new Mock <Func <Item> >();
factoryMock.Setup(factory => factory()).Returns(item);
var cache = new MKCache <Item>();
var foundItem = cache.GetOrCreate(key, factoryMock.Object, Expiration);
factoryMock.Verify(factory => factory(), Times.Once);
Assert.Same(item, foundItem);
var cachedItem = cache.GetOrCreate(key, factoryMock.Object, Expiration);
factoryMock.Verify(factory => factory(), Times.Once);
Assert.Same(item, cachedItem);
var _ = cache.GetOrCreate(item.Name, factoryMock.Object, Expiration);
// Delegate invoked a second time, because the item was not found
factoryMock.Verify(factory => factory(), Times.Exactly(2));
}
public void An_item_is_cached_with_multiple_keys()
{
var item = new Item();
var key = item.Id;
var factoryMock = new Mock <Func <Item> >();
factoryMock.Setup(factory => factory()).Returns(item);
var cache = new MKCache <Item>(
x => x.Id,
x => x.Name);
var foundItem = cache.GetOrCreate(key, factoryMock.Object, Expiration);
factoryMock.Verify(factory => factory(), Times.Once);
Assert.Same(item, foundItem);
var cachedItem = cache.GetOrCreate(key, factoryMock.Object, Expiration);
factoryMock.Verify(factory => factory(), Times.Once);
Assert.Same(item, cachedItem);
var cachedItemWithDifferentKey = cache.GetOrCreate(item.Name, factoryMock.Object, Expiration);
factoryMock.Verify(factory => factory(), Times.Once);
Assert.Same(item, cachedItemWithDifferentKey);
}
public void Can_be_disposed()
{
var cache = new MKCache <Item>();
var item = cache.GetOrCreate("1", () => new Item(), Expiration);
cache.Dispose();
// Dispose is not Clear.
Assert.Equal(1, cache.Count);
// Disposed cache cannot be used anymore.
Assert.Throws <ObjectDisposedException>(() =>
cache.GetOrCreate("1", () => new Item(), Expiration));
}
public void Can_inspect_items_count()
{
var cache = new MKCache <int>();
Assert.Equal(0, cache.Count);
cache.GetOrCreate("1", () => 1, Expiration);
Assert.Equal(1, cache.Count);
cache.GetOrCreate("2", () => 2, Expiration);
Assert.Equal(2, cache.Count);
cache.Clear();
Assert.Equal(0, cache.Count);
}
public void Null_value_does_not_throw_and_does_not_get_cached()
{
var cache = new MKCache <Item>();
var factoryMock = new Mock <Func <Item> >();
factoryMock.Setup(factory => factory()).Returns((null as Item) !);
var nullItem = cache.GetOrCreate("any", factoryMock.Object, Expiration);
factoryMock.Verify(factory => factory(), Times.Once);
Assert.Null(nullItem);
nullItem = cache.GetOrCreate("any", factoryMock.Object, Expiration);
factoryMock.Verify(factory => factory(), Times.Exactly(2));
Assert.Null(nullItem);
}
public void Can_inspect_items_count()
{
var cache = new MKCache <Item>(
x => x.Id,
x => x.Name);
Assert.Equal(0, cache.Count);
cache.GetOrCreate("1", () => new Item(), Expiration);
Assert.Equal(1, cache.Count);
cache.GetOrCreate("name", () => new Item(), Expiration);
Assert.Equal(2, cache.Count);
cache.Clear();
Assert.Equal(0, cache.Count);
}
public void An_item_is_cached_with_a_single_key()
{
var item = new Item();
var factoryMock = new Mock <Func <Item> >();
factoryMock.Setup(factory => factory()).Returns(item);
var cache = new MKCache <Item>(
x => x.Name /* Name property is the key */);
_ = cache.GetOrCreate(item.Id, factoryMock.Object, Expiration);
factoryMock.Verify(factory => factory(), Times.Once);
var cachedItem = cache.GetOrCreate(item.Name, factoryMock.Object, Expiration);
factoryMock.Verify(factory => factory(), Times.Once);
Assert.Same(item, cachedItem);
_ = cache.GetOrCreate(item.Id, factoryMock.Object, Expiration);
// Delegate invoked a second time, because the item was not found using its Id
factoryMock.Verify(factory => factory(), Times.Exactly(2));
}
public void Null_key_from_identifier_does_not_throw_and_value_does_not_get_cached()
{
var cache = new MKCache <Item>(
x => x.Name /* The Name is the key */);
var item = new Item(name: null !);
var factoryMock = new Mock <Func <Item> >();
factoryMock.Setup(factory => factory()).Returns(item);
var foundItem = cache.GetOrCreate(item.Id, factoryMock.Object, Expiration);
factoryMock.Verify(factory => factory(), Times.Once);
Assert.Same(item, foundItem);
foundItem = cache.GetOrCreate("any", factoryMock.Object, Expiration);
factoryMock.Verify(factory => factory(), Times.Exactly(2));
Assert.Same(item, foundItem);
foundItem = cache.GetOrCreate("any", factoryMock.Object, Expiration);
factoryMock.Verify(factory => factory(), Times.Exactly(3));
Assert.Same(item, foundItem);
}
public void Items_can_be_retrieved_from_the_cache()
{
var item = new Item();
var factoryMock = new Mock <Func <Item> >();
factoryMock.Setup(factory => factory()).Returns(item);
var cache = new MKCache <Item>();
var nullItem = cache.Get("any");
Assert.Null(nullItem);
var foundItem = cache.GetOrCreate("any", factoryMock.Object, Expiration);
factoryMock.Verify(factory => factory(), Times.Once);
Assert.Same(item, foundItem);
var cachedItem = cache.Get("any");
Assert.Same(item, cachedItem);
}
