/// <summary>
/// Converts the source sequence to <see cref="ResourceEventDeltaBlock{TKey,TResource}"/>. This transitions from
/// observable into TPL Dataflow monad. The resulting block allows queue processing semantics where each resulting item
/// is the collection of the given <see cref="ResourceEvent{TResource}"/> for grouped by resource object identified by the
/// <paramref name="keySelector"/> parameter
/// </summary>
/// <param name="source">The resource observable</param>
/// <param name="keySelector">Key selector function that uniquely identifies objects in the resource collection being observed</param>
/// <typeparam name="TResource">The type of resource</typeparam>
/// <typeparam name="TKey">The key for the resource</typeparam>
/// <returns>The <see cref="ResourceEventDeltaBlock{TKey,TResource}"/> connected to the observable</returns>
public static ISourceBlock <List <ResourceEvent <TResource> > > ToResourceEventDeltaBlock <TKey, TResource>(this IObservable <ResourceEvent <TResource> > source, Func <TResource, TKey> keySelector, out IDisposable subscription)
{
var deltaBlock = new ResourceEventDeltaBlock <TKey, TResource>(keySelector);
subscription = source.Subscribe(deltaBlock.AsObserver());
return(deltaBlock);
}
public async Task DistributeWork(string description, ScheduledEvent <TestResource>[] events, ResourceEvent <TestResource>[][] expected)
{
_log.LogInformation(description);
var sut = new ResourceEventDeltaBlock <int, TestResource>(x => x.Key);
var testScheduler = new TestScheduler();
var results = new List <List <ResourceEvent <TestResource> > >();
var actionBlock = new ActionBlock <List <ResourceEvent <TestResource> > >(deltas =>
{
_log.LogTrace($"Worker called for {string.Join("",deltas)}");
results.Add(deltas);
testScheduler.Sleep(300);
}, new ExecutionDataflowBlockOptions()
{
BoundedCapacity = 1,
MaxDegreeOfParallelism = 1
});
sut.LinkTo(actionBlock, new DataflowLinkOptions {
PropagateCompletion = true
});
events.ToTestObservable(testScheduler, logger: _log).Subscribe(sut.AsObserver());
await actionBlock.Completion.TimeoutIfNotDebugging();
results.Should().BeEquivalentTo(expected);
}