view Implab/ActionTaskBase.cs @ 196:40d7fed4a09e

fixed promise chaining behavior, the error handler doesn't handle result or cancellation handlers exceptions these exceptions are propagated to the next handlers.
author cin
date Mon, 29 Aug 2016 23:15:51 +0300
parents dd4a3590f9c6
children
line wrap: on
line source

using System;

namespace Implab {
    public class ActionTaskBase : AbstractTask {
        readonly Action<Exception> m_cancel;
        readonly Action<Exception> m_error;

        protected ActionTaskBase( Action<Exception> error, Action<Exception> cancel, bool autoCancellable) {
            m_error = error;
            m_cancel = cancel;
            if (autoCancellable)
                CancellationRequested(CancelOperation);
        }

        public void Reject(Exception error) {
            Safe.ArgumentNotNull(error, "error");
            if (LockCancelation())
                HandleErrorInternal(error);
        }

        public override void CancelOperation(Exception reason) {
            if (LockCancelation())
                HandleCancelInternal(reason);
        }

        protected void HandleErrorInternal(Exception error) {
            if (m_error != null) {
                try {
                    m_error(error);
                    SetResult();
                } catch(Exception err) {
                    SetErrorInternal(err);
                }
            } else {
                SetErrorInternal(error);
            }
        }

        protected void HandleCancelInternal(Exception error) {
            if (m_cancel != null) {
                try {
                    m_cancel(error);
                    SetResult();
                } catch(Exception err) {
                    SetErrorInternal(err);
                }
            } else {
                SetCancelledInternal(error);
            }
        }
    }
}