/// <summary>
/// Attempts Registers a callback that will be called
/// when the application is shutdown.
/// </summary>
/// <param name="callback">the callback when the shutdown occurs</param>
/// <param name="shutdownOrder">the order that the callback will occur.</param>
/// <returns></returns>
public static bool TryRegisterCallback(Action callback, ShutdownHandlerOrder shutdownOrder = ShutdownHandlerOrder.Default)
{
List <WeakAction> list;
switch (shutdownOrder)
{
case ShutdownHandlerOrder.First:
list = s_onShutdownCallbackFirst;
break;
case ShutdownHandlerOrder.Default:
list = s_onShutdownCallbackDefault;
break;
case ShutdownHandlerOrder.Last:
list = s_onShutdownCallbackLast;
break;
default:
throw new ArgumentOutOfRangeException(nameof(shutdownOrder), shutdownOrder, null);
}
if (IsShuttingDown)
{
return(false);
}
lock (s_syncRoot)
{
if (IsShuttingDown)
{
return(false);
}
list.RemoveWhere(x => !x.IsAlive);
list.Add(new WeakAction(callback));
return(true);
}
}
/// <summary>
/// Attempts Registers a callback that will be called
/// when the application is shutdown.
/// </summary>
/// <param name="callback">the callback when the shutdown occurs</param>
/// <param name="shutdownOrder">the order that the callback will occur.</param>
/// <returns></returns>
public static bool TryRegisterCallback(Action callback, ShutdownHandlerOrder shutdownOrder = ShutdownHandlerOrder.Default)
{
List<WeakAction> list;
switch (shutdownOrder)
{
case ShutdownHandlerOrder.First:
list = s_onShutdownCallbackFirst;
break;
case ShutdownHandlerOrder.Default:
list = s_onShutdownCallbackDefault;
break;
case ShutdownHandlerOrder.Last:
list = s_onShutdownCallbackLast;
break;
default:
throw new ArgumentOutOfRangeException(nameof(shutdownOrder), shutdownOrder, null);
}
if (IsShuttingDown)
return false;
lock (s_syncRoot)
{
if (IsShuttingDown)
return false;
list.RemoveWhere(x => !x.IsAlive);
list.Add(new WeakAction(callback));
return true;
}
}
