Reset method problem #10
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Hi again, #region
using System;
using System.Collections.Generic;
using System.Reactive.Concurrency;
using System.Runtime.CompilerServices;
using System.Threading;
using System.Threading.Tasks;
using BFF.DataVirtualizingCollection.DataVirtualizingCollection;
#endregion
namespace ConsoleApp11
{
internal static class Program
{
public static int Version = 1;
private const int NumberItem = 5;
private static readonly TimeSpan Delay = TimeSpan.FromSeconds(1);
private static readonly TimeSpan EpsilonDelay = Delay / 10;
private static TestAsyncEnumerable? testAsyncEnumerable;
private static IDataVirtualizingCollection<int>? dataVirtualizingCollection;
private static async Task Main()
{
testAsyncEnumerable = new TestAsyncEnumerable(NumberItem, Delay);
dataVirtualizingCollection = DataVirtualizingCollectionBuilder.Build<int>
(
10,
new TaskPoolScheduler(Task.Factory)
)
.NonPreloading()
.Hoarding()
.AsyncEnumerableBasedFetchers(PageFetcher, CountFetcher)
.AsyncIndexAccess((_, _) => -2);
await Task.Delay(EpsilonDelay);
//problem not show CountFetcher cancel
Version++;
dataVirtualizingCollection.Reset();
await Task.Delay(Delay + EpsilonDelay);
var dataVirtualizing = dataVirtualizingCollection[0];
await Task.Delay(EpsilonDelay);
//problem not show PageFetcher cancel
Version++;
dataVirtualizingCollection.Reset();
//problem not run PageFetcher version 3
dataVirtualizing = dataVirtualizingCollection[0];
Console.WriteLine("End");
Console.ReadKey();
}
private static async Task<int> CountFetcher(CancellationToken cancellationToken)
{
var version = Version;
try
{
Console.WriteLine($"{nameof(CountFetcher)} begin {nameof(Version)}={version}");
await Task.Delay(Delay, cancellationToken);
Console.WriteLine($"{nameof(CountFetcher)} end {nameof(Version)}={version}");
return NumberItem;
}
catch (OperationCanceledException)
{
Console.WriteLine($"{nameof(CountFetcher)} cancel {nameof(Version)}={version}");
throw;
}
}
private static async IAsyncEnumerable<int> PageFetcher
(
int offset,
int count,
[EnumeratorCancellation] CancellationToken cancellationToken
)
{
var version = Version;
Console.WriteLine($"{nameof(PageFetcher)} begin {nameof(Version)}={version}");
await foreach (var item in testAsyncEnumerable!.WithCancellation(cancellationToken))
{
yield return item;
}
Console.WriteLine($"{nameof(PageFetcher)} end {nameof(Version)}={version}");
}
}
public class TestAsyncEnumerable : IAsyncEnumerable<int>
{
private readonly int _number;
private readonly TimeSpan _delay;
public TestAsyncEnumerable(int number, TimeSpan delay)
{
_number = number;
_delay = delay;
}
public IAsyncEnumerator<int> GetAsyncEnumerator
(
CancellationToken cancellationToken
) => new TestAsyncEnumerator(_number, _delay, Program.Version, cancellationToken);
}
public class TestAsyncEnumerator : IAsyncEnumerator<int>
{
private readonly int _number;
private readonly TimeSpan _timeSpan;
private readonly int _version;
private readonly CancellationToken _cancellationToken;
public TestAsyncEnumerator(int number, TimeSpan timeSpan, int version, CancellationToken cancellationToken)
{
_number = number;
_timeSpan = timeSpan;
_version = version;
_cancellationToken = cancellationToken;
}
public int Current { get; private set; } = -1;
public ValueTask DisposeAsync()
{
Console.WriteLine($"{nameof(DisposeAsync)} {nameof(Version)}={_version}");
return default;
}
public async ValueTask<bool> MoveNextAsync()
{
try
{
Console.WriteLine($"before {nameof(MoveNextAsync)} {nameof(Current)} {Current} {nameof(Version)}={_version}");
await Task.Delay(_timeSpan, _cancellationToken);
var current = Current + 1;
if (current >= _number)
{
Console.WriteLine($"end {nameof(MoveNextAsync)} {nameof(Current)} {Current} {nameof(Version)}={_version}");
return false;
}
Current = current;
Console.WriteLine($"after {nameof(MoveNextAsync)} {nameof(Current)} {Current} {nameof(Version)}={_version}");
return true;
}
catch (OperationCanceledException)
{
Console.WriteLine($"{nameof(TestAsyncEnumerator)} is canceled {nameof(Version)}={_version}");
throw;
}
}
}
}The two minor changes that I have done is: First, I put the first So the count fetcher fix seems to work. For the second problem I didn't change anything in BFF.DVC. With a smaller Delay it seems to work as intended. You can see that the As for the third problem. This is intended by design of BFF.DVC. In order for the page fetcher to run again after a Did the fix and the explanations help you? |
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@Yeah69 Works as expected, thanks |
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@Yeah69 In wpf, after calling the reset method, sometimes display records from placeholder |
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System.InvalidOperationException Изначально это исключение было создано в этом стеке вызовов: System.Reactive.dll!System.Reactive.AnonymousSafeObserver<(int, int, CommunicationInfrastructure.Models.DetailModel[], CommunicationInfrastructure.Models.DetailModel[])>.OnNext((int, int, CommunicationInfrastructure.Models.DetailModel[], CommunicationInfrastructure.Models.DetailModel[]) value) Строка 44 C# |
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I am sorry. I don't know where to begin to resolve the issue based on the call stacks you posted. Honestly, I have no idea how to reproduce it. |
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