Korero – Rev 1

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using System;
using System.Threading;
using System.Threading.Tasks;

namespace Korero.Communication
{
    public class ScheduledContinuation : IDisposable
    {
        #region Private Delegates, Events, Enums, Properties, Indexers and Fields

        private CancellationTokenSource _cancellationTokenSource = new CancellationTokenSource();

        private ManualResetEvent _ready = new ManualResetEvent(true);

        private Task _task;

        #endregion

        #region Constructors, Destructors and Finalizers

        public void Dispose()
        {
            _ready.Dispose();
            _ready = null;
        }

        #endregion

        #region Public Methods

        public void Schedule(int delay, Action execute)
        {
            if (!_ready.WaitOne(0))
            {
                return;
            }

            _ready.Reset();

            if (_task != null)
            {
                _cancellationTokenSource?.Cancel();
                _task.Wait();
                _cancellationTokenSource?.Dispose();
                _cancellationTokenSource = null;

                _cancellationTokenSource = new CancellationTokenSource();
            }

            _task = Task.Delay(delay, _cancellationTokenSource.Token)
                .ContinueWith(task =>
                {
                    try
                    {
                        execute.Invoke();
                    }
                    finally
                    {
                        _ready.Set();
                    }
                }, _cancellationTokenSource.Token);
        }

        #endregion
    }
}

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