AwaitableCompletionHandler.cs

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using System;
using System.Runtime.CompilerServices;
using System.Threading.Tasks;
 
namespace java.nio.channels
{
 
    public class AwaitableCompletionHandler : AwaitableCompletionHandler<object>
    {
 
        public new Task Task => base.Task;
 
        public new TaskAwaiter GetAwaiter() => Task.GetAwaiter();
 
    }
 
    public class AwaitableCompletionHandler<V> : AwaitableCompletionHandler<V, object>
    {
 
 
 
    }
 
    public class AwaitableCompletionHandler<V, A> : CompletionHandler
    {
 
        readonly TaskCompletionSource<V> _source = new TaskCompletionSource<V>();
        A? _attachment;
 
        public A? Attachment => _attachment;
 
        public Task<V> Task => _source.Task;
 
        public TaskAwaiter<V> GetAwaiter() => Task.GetAwaiter();
 
        void CompletionHandler.completed(object result, object attachment)
        {
            _attachment = (A)attachment;
            _source.SetResult((V)result);
        }
 
        void CompletionHandler.failed(Exception exc, object attachment)
        {
            _attachment = (A)attachment;
            _source.SetException(exc);
        }
 
    }
 
}