/// <inheritdoc cref="AccessAsync{TResource,TResult}(IAccessQueue{TResource},IEnumerable{IAccess{TResource,TResult}},CancellationToken,int,bool)" />
public static async IAsyncEnumerable <TResult> AccessAsync <TResource, TResult>(this IAccessQueue <TResource> accessQueue,
IAsyncEnumerable <IAccess <TResource, TResult> > accesses, [EnumeratorCancellation] CancellationToken cancellation = default,
int attemptsCount = 1)
where TResource : notnull
{
_ = accessQueue ?? throw new ArgumentNullException(nameof(accessQueue));
var channel = Channel.CreateUnbounded <Task <TResult> >(new UnboundedChannelOptions {
SingleReader = true, SingleWriter = true
});
var reader = channel.Reader;
var writer = channel.Writer;
_ = Task.Run(async() =>
{
try
{
await foreach (var access in accesses.WithCancellation(cancellation).ConfigureAwait(false))
{
await writer.WriteAsync(accessQueue.EnqueueAccess(access, cancellation, attemptsCount), cancellation).ConfigureAwait(false);
}
}
catch (OperationCanceledException ex)
{
await writer.WriteAsync(Task.FromCanceled <TResult>(ex.CancellationToken), CancellationToken.None).ConfigureAwait(false);
}
catch (Exception ex)
{
await writer.WriteAsync(Task.FromException <TResult>(ex), cancellation).ConfigureAwait(false);
}
finally
{
writer.Complete();
}
},
cancellation);
while (await reader.WaitToReadAsync(cancellation).ConfigureAwait(false))
{
yield return(await(await reader.ReadAsync(cancellation).ConfigureAwait(false)).ConfigureAwait(false));
}
}
/// <summary> Batch process access actions </summary>
/// <param name="accessQueue"> Access Queue instance </param>
/// <param name="accesses"> Access actions to process </param>
/// <param name="cancellation"> Processing cancellation token </param>
/// <param name="attemptsCount"> Retry on fail attempts count </param>
/// <param name="enqueueAll"> Option to enqueue all data first </param>
/// <typeparam name="TResource"> Shared resource type </typeparam>
/// <typeparam name="TResult"> Processing result type </typeparam>
/// <returns> Processing result task enumeration </returns>
/// <exception cref="ArgumentNullException"> Thrown if <paramref name="accessQueue" /> or <paramref name="accesses" /> is NULL </exception>
public static async IAsyncEnumerable <TResult> AccessAsync <TResource, TResult>(this IAccessQueue <TResource> accessQueue,
IEnumerable <IAccess <TResource, TResult> > accesses, [EnumeratorCancellation] CancellationToken cancellation = default, int attemptsCount = 1,
bool enqueueAll = false)
where TResource : notnull
{
_ = accessQueue ?? throw new ArgumentNullException(nameof(accessQueue));
var results = (accesses ?? throw new ArgumentNullException(nameof(accesses))).Select(access
=> accessQueue.EnqueueAccess(access, cancellation, attemptsCount));
if (enqueueAll)
{
results = results.ToList();
}
foreach (var result in results)
{
yield return(await result.ConfigureAwait(false));
}
}