public async Task Keys_Are_DeDuped()
{
var mock = new Mock <IOrdersStore>();
var orders = Fake.Orders.Generate(2);
orders.ForEach(o => o.UserId = 1);
mock.Setup(store => store.GetOrdersByUserIdAsync(It.IsAny <IEnumerable <int> >(), default))
.ReturnsAsync(orders.ToLookup(o => o.UserId));
var ordersStore = mock.Object;
var loader = new CollectionBatchDataLoader <int, Order>(ordersStore.GetOrdersByUserIdAsync);
// Start async tasks to load duplicate keys
var task1 = loader.LoadAsync(1);
var task2 = loader.LoadAsync(1);
// Dispatch loading
await loader.DispatchAsync();
// Now await tasks
var user1Orders = await task1;
var user1bOrders = await task2;
mock.Verify(x => x.GetOrdersByUserIdAsync(new[] { 1 }, default), Times.Once,
"The keys passed to the fetch delegate should be de-duplicated");
}
public async Task All_Requested_Keys_Should_Be_Cached()
{
var loader = new CollectionBatchDataLoader <int, Order>((ids, ct) => Orders.GetOrdersByUserIdAsync(ids));
// Start async tasks to load by User ID
var task1 = loader.LoadAsync(1);
var task2 = loader.LoadAsync(2);
// Dispatch loading
loader.Dispatch();
var user1Orders = await task1;
var user2Orders = await task2;
user1Orders.ShouldNotBeNull();
user2Orders.ShouldNotBeNull();
user1Orders.Count().ShouldBe(2);
user2Orders.Count().ShouldBe(0);
// Request keys 1 and 2 again. Result should be cached.
// Key 3 should NOT be cached
var task1b = loader.LoadAsync(1);
var task2b = loader.LoadAsync(2);
var task3 = loader.LoadAsync(3);
task1b.Status.ShouldBe(TaskStatus.RanToCompletion, "Result should already be cached");
task2b.Status.ShouldBe(TaskStatus.RanToCompletion, "Result should already be cached");
task3.Status.ShouldNotBe(TaskStatus.RanToCompletion, "Result should already be cached");
// Dispatch loading
loader.Dispatch();
var user1bOrders = await task1b;
var user2bOrders = await task2b;
var user3Orders = await task3;
user1bOrders.ShouldNotBeNull();
user2bOrders.ShouldNotBeNull();
user3Orders.ShouldNotBeNull();
user1Orders.Count().ShouldBe(2);
user2Orders.Count().ShouldBe(0);
user3Orders.Count().ShouldBe(0);
// This should have been called only once to load in a single batch
Orders.GetOrdersByUserIdCalledCount.ShouldBe(2, "Operations should be batched");
}
public async Task Keys_Are_DeDuped()
{
var loader = new CollectionBatchDataLoader <int, Order>((ids, ct) => Orders.GetOrdersByUserIdAsync(ids));
// Start async tasks to load duplicate keys
var task1 = loader.LoadAsync(1);
var task2 = loader.LoadAsync(1);
// Dispatch loading
loader.Dispatch();
// Now await tasks
var user1Orders = await task1;
var user1bOrders = await task2;
Orders.GetOrdersByUserIdCalledCount.ShouldBe(1);
Orders.GetOrdersByUserId_UserIds.Count().ShouldBe(1, "The keys passed to the fetch delegate should be de-duplicated");
}
public async Task NonExistent_Key_Should_Return_Empty()
{
var mock = new Mock <IOrdersStore>();
var orders = Fake.Orders.Generate(2);
orders.ForEach(o => o.UserId = 1);
mock.Setup(store => store.GetOrdersByUserIdAsync(It.IsAny <IEnumerable <int> >(), default))
.ReturnsAsync(orders.ToLookup(o => o.UserId));
var ordersStore = mock.Object;
var loader = new CollectionBatchDataLoader <int, Order>(ordersStore.GetOrdersByUserIdAsync);
// Start async tasks to load by User ID
var result1 = loader.LoadAsync(1);
var result2 = loader.LoadAsync(2);
// Dispatch loading
await loader.DispatchAsync().ConfigureAwait(false);
var task1 = result1.GetResultAsync();
var task2 = result2.GetResultAsync();
var user1Orders = await task1.ConfigureAwait(false);
var user2Orders = await task2.ConfigureAwait(false);
user1Orders.ShouldNotBeNull();
user2Orders.ShouldNotBeNull();
user1Orders.Count().ShouldBe(2);
user2Orders.Count().ShouldBe(0);
// This should have been called only once to load in a single batch
mock.Verify(x => x.GetOrdersByUserIdAsync(new[] { 1, 2 }, default), Times.Once,
"Operations should be batched");
mock.VerifyNoOtherCalls();
}
public async Task NonExistent_Key_Should_Return_Empty()
{
var loader = new CollectionBatchDataLoader <int, Order>((ids, ct) => Orders.GetOrdersByUserIdAsync(ids));
// Start async tasks to load by User ID
var task1 = loader.LoadAsync(1);
var task2 = loader.LoadAsync(2);
// Dispatch loading
loader.Dispatch();
var user1Orders = await task1;
var user2Orders = await task2;
user1Orders.ShouldNotBeNull();
user2Orders.ShouldNotBeNull();
user1Orders.Count().ShouldBe(2);
user2Orders.Count().ShouldBe(0);
// This should have been called only once to load in a single batch
Orders.GetOrdersByUserIdCalledCount.ShouldBe(1, "Operations should be batched");
}
public async Task All_Requested_Keys_Should_Be_Cached()
{
var mock = new Mock <IOrdersStore>();
var orders = Fake.Orders.Generate(2);
orders.ForEach(o => o.UserId = 1);
mock.Setup(store => store.GetOrdersByUserIdAsync(It.IsAny <IEnumerable <int> >(), default))
.ReturnsAsync(orders.ToLookup(o => o.UserId));
var ordersStore = mock.Object;
var loader = new CollectionBatchDataLoader <int, Order>(ordersStore.GetOrdersByUserIdAsync);
// Start async tasks to load by User ID
var task1 = loader.LoadAsync(1);
var task2 = loader.LoadAsync(2);
// Dispatch loading
await loader.DispatchAsync();
var user1Orders = await task1;
var user2Orders = await task2;
user1Orders.ShouldNotBeNull();
user2Orders.ShouldNotBeNull();
user1Orders.Count().ShouldBe(2);
user2Orders.Count().ShouldBe(0);
// Request keys 1 and 2 again. Result should be cached.
// Key 3 should NOT be cached
var task1b = loader.LoadAsync(1);
var task2b = loader.LoadAsync(2);
var task3 = loader.LoadAsync(3);
task1b.Status.ShouldBe(TaskStatus.RanToCompletion, "Result should already be cached");
task2b.Status.ShouldBe(TaskStatus.RanToCompletion, "Result should already be cached");
task3.Status.ShouldNotBe(TaskStatus.RanToCompletion, "Result should already be cached");
// Dispatch loading
await loader.DispatchAsync();
var user1bOrders = await task1b;
var user2bOrders = await task2b;
var user3Orders = await task3;
user1bOrders.ShouldNotBeNull();
user2bOrders.ShouldNotBeNull();
user3Orders.ShouldNotBeNull();
user1Orders.Count().ShouldBe(2);
user2Orders.Count().ShouldBe(0);
user3Orders.Count().ShouldBe(0);
// Verify calls to order store were cached properly
mock.Verify(x => x.GetOrdersByUserIdAsync(new[] { 1, 2 }, default), Times.Once);
mock.Verify(x => x.GetOrdersByUserIdAsync(new[] { 3 }, default), Times.Once);
mock.VerifyNoOtherCalls();
}
public async Task All_Requested_Keys_Should_Be_Cached()
{
var mock = new Mock <IOrdersStore>();
var orders = Fake.Orders.Generate(2);
orders.ForEach(o => o.UserId = 1);
mock.Setup(store => store.GetOrdersByUserIdAsync(It.IsAny <IEnumerable <int> >(), default))
.ReturnsAsync(orders.ToLookup(o => o.UserId), delay: TimeSpan.FromMilliseconds(20));
var ordersStore = mock.Object;
var loader = new CollectionBatchDataLoader <int, Order>(ordersStore.GetOrdersByUserIdAsync);
// Start async tasks to load by User ID
var result1 = loader.LoadAsync(1);
var result2 = loader.LoadAsync(2);
// Dispatch loading
await loader.DispatchAsync().ConfigureAwait(false);
var task1 = result1.GetResultAsync();
var task2 = result2.GetResultAsync();
var user1Orders = await task1.ConfigureAwait(false);
var user2Orders = await task2.ConfigureAwait(false);
user1Orders.ShouldNotBeNull();
user2Orders.ShouldNotBeNull();
user1Orders.Count().ShouldBe(2);
user2Orders.Count().ShouldBe(0);
// Request keys 1 and 2 again. Result should be cached.
// Key 3 should NOT be cached
//due to the new dataloader design, these status checks are meaningless
var task1b = loader.LoadAsync(1).GetResultAsync();
var task2b = loader.LoadAsync(2).GetResultAsync();
var task3 = loader.LoadAsync(3).GetResultAsync();
task1b.Status.ShouldBe(TaskStatus.RanToCompletion, "Result should already be cached");
task2b.Status.ShouldBe(TaskStatus.RanToCompletion, "Result should already be cached");
//task3.Status.ShouldNotBe(TaskStatus.RanToCompletion, "Result should already be cached");
// Dispatch loading
await loader.DispatchAsync().ConfigureAwait(false);
var user1bOrders = await task1b.ConfigureAwait(false);
var user2bOrders = await task2b.ConfigureAwait(false);
var user3Orders = await task3.ConfigureAwait(false);
user1bOrders.ShouldNotBeNull();
user2bOrders.ShouldNotBeNull();
user3Orders.ShouldNotBeNull();
user1Orders.Count().ShouldBe(2);
user2Orders.Count().ShouldBe(0);
user3Orders.Count().ShouldBe(0);
// Verify calls to order store were cached properly
mock.Verify(x => x.GetOrdersByUserIdAsync(new[] { 1, 2 }, default), Times.Once);
mock.Verify(x => x.GetOrdersByUserIdAsync(new[] { 3 }, default), Times.Once);
mock.VerifyNoOtherCalls();
}