view Implab/AbstractTaskT.cs @ 187:dd4a3590f9c6 ref20160224

Reworked cancelation handling, if the cancel handler isn't specified the OperationCanceledException will be handled by the error handler Any unhandled OperationCanceledException will cause the promise cancelation
author cin
date Tue, 19 Apr 2016 17:35:20 +0300
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using System;
using System.Threading;

namespace Implab {
    public abstract class AbstractTask<T> : AbstractPromise<T> {
        int m_cancelationLock;

        /// <summary>
        /// Получает эксклюзивное право отмены задания, используется для отмены задания до начала его выполнения.
        /// </summary>
        /// <returns><c>true</c>, if cancelation was locked, <c>false</c> otherwise.</returns>
        protected bool LockCancelation() {
            return 0 == Interlocked.CompareExchange(ref m_cancelationLock, 1, 0);
        }



        protected void SetErrorInternal(Exception error) {
            // unwrap 
            while (error is PromiseTransientException && error.InnerException != null)
                error = error.InnerException;

            if (error is OperationCanceledException)
                SetCancelled(error);
            else
                SetError(error);
        }

        protected void SetCancelledInternal(Exception reason) {
            SetCancelled(
                reason == null ? new OperationCanceledException() : reason is OperationCanceledException ? reason : new OperationCanceledException(null, reason)
            );
        }
    }
}