view Implab/ActionChainTask.cs @ 209:a867536c68fc v2

Bound promise to CancellationToken Added new states to ExecutionSate enum. Added Safe.Guard() method to handle cleanup of the result of the promise
author cin
date Wed, 16 Nov 2016 03:06:08 +0300
parents 40d7fed4a09e
children eee3e49dd1ff
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line source

using System;

namespace Implab {
    public class ActionChainTask : ActionChainTaskBase, IDeferred {
        readonly Func<IPromise> m_task;

        /// <summary>
        /// Initializes a new instance of the <see cref="Implab.ActionChainTask"/> class.
        /// </summary>
        /// <param name="task">The operation which will be performed when the <see cref="Resolve()"/> is called.</param>
        /// <param name="error">The error handler which will invoke when the <see cref="Reject(Exception)"/> is called or when the task fails with an error.</param>
        /// <param name="cancel">The cancellation handler.</param>
        /// <param name="autoCancellable">If set to <c>true</c> will automatically accept
        ///  all cancel requests before the task is started with <see cref="Resolve()"/>,
        /// after that all requests are directed to the task.</param>
        public ActionChainTask(Func<IPromise> task, Func<Exception, IPromise> error, Func<Exception, IPromise> cancel, bool autoCancellable) : base(error,cancel, autoCancellable) {
            m_task = task;
        }

        public void Resolve() {
            if (m_task != null && LockCancelation()) {
                try {
                    var p = m_task();
                    p.On(SetResult, HandleErrorInternal, HandleCancelInternal);
                    CancellationRequested(p.Cancel);
                } catch(Exception err) {
                    SetErrorInternal(err);
                }
            }
        }

    }
}