public async Task VerifyEvents()
{
var listener = new TestListener();
var observer = new TestObserver(listener);
using (DiagnosticListener.AllListeners.Subscribe(observer))
{
// arrange
var batchOptions = new DataLoaderOptions <string>
{
AutoDispatching = true,
Batching = true,
BatchRequestDelay = TimeSpan.FromMilliseconds(150),
Caching = true
};
var batchLoader = new DataLoader <string, string>(
batchOptions,
FetchDataAsync);
var batchErrorLoader = new DataLoader <string, string>(
batchOptions,
(keys, canncellationToken) =>
throw new Exception("BatchError: Foo"));
var singleOptions = new DataLoaderOptions <string>
{
AutoDispatching = true,
Batching = false,
Caching = true
};
var singleLoader = new DataLoader <string, string>(
singleOptions,
FetchDataAsync);
// act
await Catch(() => batchLoader.LoadAsync("Foo"))
.ConfigureAwait(false);
await Task.Delay(400).ConfigureAwait(false);
await Catch(() => batchLoader.LoadAsync("Foo", "Bar"))
.ConfigureAwait(false);
await Task.Delay(400).ConfigureAwait(false);
await Catch(() => batchLoader.LoadAsync("Bar", "Baz"))
.ConfigureAwait(false);
await Task.Delay(400).ConfigureAwait(false);
await Catch(() => batchLoader.LoadAsync("Qux"))
.ConfigureAwait(false);
await Task.Delay(400).ConfigureAwait(false);
await Catch(() => batchErrorLoader.LoadAsync("Foo"))
.ConfigureAwait(false);
await Task.Delay(400).ConfigureAwait(false);
await Catch(() => singleLoader.LoadAsync("Foo"))
.ConfigureAwait(false);
await Task.Delay(400).ConfigureAwait(false);
await Catch(() => singleLoader.LoadAsync("Foo", "Bar"))
.ConfigureAwait(false);
await Task.Delay(400).ConfigureAwait(false);
await Catch(() => singleLoader.LoadAsync("Bar", "Baz"))
.ConfigureAwait(false);
await Task.Delay(400).ConfigureAwait(false);
await Catch(() => singleLoader.LoadAsync("Qux"))
.ConfigureAwait(false);
// assert
listener.Snapshot();
}
}
public TestObserver(TestListener listener)
{
_listener = listener ??
throw new ArgumentNullException(nameof(listener));
}