// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using System.Threading;
using Microsoft.AspNetCore.Mvc.Infrastructure;
using Microsoft.Extensions.Primitives;

namespace ApiExplorerWebSite
{
    public class ActionDescriptorChangeProvider : IActionDescriptorChangeProvider
    {
        public ActionDescriptorChangeProvider(WellKnownChangeToken changeToken)
        {
            ChangeToken = changeToken;
        }

        public WellKnownChangeToken ChangeToken { get; }

        public IChangeToken GetChangeToken()
        {
            if (ChangeToken.TokenSource.IsCancellationRequested)
            {
                var changeTokenSource = new CancellationTokenSource();
                return new CancellationChangeToken(changeTokenSource.Token);
            }

            return new CancellationChangeToken(ChangeToken.TokenSource.Token);
        }
    }
}
