AsyncBulkheadPolicy
A bulkhead-isolation policy which can be applied to delegates.
using System;
using System.Diagnostics;
using System.Runtime.CompilerServices;
using System.Threading;
using System.Threading.Tasks;
namespace Polly.Bulkhead
{
[System.Runtime.CompilerServices.NullableContext(1)]
[System.Runtime.CompilerServices.Nullable(0)]
public class AsyncBulkheadPolicy : AsyncPolicy, IBulkheadPolicy, IsPolicy, IDisposable
{
private readonly SemaphoreSlim _maxParallelizationSemaphore;
private readonly SemaphoreSlim _maxQueuedActionsSemaphore;
private readonly int _maxQueueingActions;
private readonly Func<Context, Task> _onBulkheadRejectedAsync;
public int BulkheadAvailableCount => _maxParallelizationSemaphore.CurrentCount;
public int QueueAvailableCount => Math.Min(_maxQueuedActionsSemaphore.CurrentCount, _maxQueueingActions);
internal AsyncBulkheadPolicy(int maxParallelization, int maxQueueingActions, Func<Context, Task> onBulkheadRejectedAsync)
: base((PolicyBuilder)null)
{
_maxQueueingActions = maxQueueingActions;
if (onBulkheadRejectedAsync == null)
throw new ArgumentNullException("onBulkheadRejectedAsync");
_onBulkheadRejectedAsync = onBulkheadRejectedAsync;
(SemaphoreSlim, SemaphoreSlim) valueTuple = BulkheadSemaphoreFactory.CreateBulkheadSemaphores(maxParallelization, maxQueueingActions);
_maxParallelizationSemaphore = valueTuple.Item1;
_maxQueuedActionsSemaphore = valueTuple.Item2;
}
[DebuggerStepThrough]
protected override Task<TResult> ImplementationAsync<[System.Runtime.CompilerServices.Nullable(0)] TResult>(Func<Context, CancellationToken, Task<TResult>> action, Context context, CancellationToken cancellationToken, bool continueOnCapturedContext)
{
return AsyncBulkheadEngine.ImplementationAsync(action, context, _onBulkheadRejectedAsync, _maxParallelizationSemaphore, _maxQueuedActionsSemaphore, cancellationToken, continueOnCapturedContext);
}
public void Dispose()
{
_maxParallelizationSemaphore.Dispose();
_maxQueuedActionsSemaphore.Dispose();
}
}
}