/// <summary>
/// Return allocated consumable units back to the
/// <see cref="Consumable"/> in the event the
/// <see cref="ProxyDesTaskDesTask{T}.Client"/> is canceled or the event
/// that runs the <see cref="ProxyDesTaskDesTask{T}.Client"/> is canceled.
/// </summary>
/// <remarks>
/// This method is used as a <see cref="DeferredDataCallback"/>
/// delegate. The delegate is allocated by the
/// <see cref="Consumable.RemoveUnits"/> method.
/// </remarks>
/// <param name="evt">
/// The <see cref="ActivationEvent"/> making the data request.
/// </param>
/// <returns>Always returns <see langword="null"/>.</returns>
internal object ReturnUnits(ActivationEvent evt)
{
if (!evt.IsPending)
{
Blocker.AddUnits(_quantity);
}
return(null);
}
/// <summary>
/// Resupply a <see cref="Consumable"/> on behalf of some client
/// <see cref="DesTask"/>.
/// </summary>
/// <param name="activator">Not used.</param>
/// <param name="data">Not used.</param>
protected override void ExecuteTask(object activator, object data)
{
Blocker.AddUnits(Quantity);
ResumeAll(Blocker, null);
}