/// <summary>
/// The given Action will be performed when the task ends.
/// </summary>
/// <param name="action">The action to perform.</param>
/// <param name="target">The DispatcherBase to perform the action on.</param>
/// <returns>This task.</returns>
public static Task <T> WhenEnded <T>(this Task <T> task, Action <Task <T> > action, DispatcherBase target)
{
task.TaskEnded += t =>
{
if (target == null)
{
action(task);
}
else
{
target.Dispatch(() => action(task));
}
};
return(task);
}
/// <summary>
/// Starts this Task when the other Task ended successfully.
/// </summary>
/// <param name="followingTask">The task to await.</param>
/// <param name="target">The DispatcherBase to start this task on.</param>
/// <returns>This task.</returns>
public static Task Await(this Task that, Task taskToWaitFor, DispatcherBase target)
{
taskToWaitFor.Then(that, target);
return(that);
}
/// <summary>
/// The given Action will be performed when the task fails.
/// </summary>
/// <param name="action">The action to perform.</param>
/// <param name="target">The DispatcherBase to perform the action on.</param>
/// <returns>This task.</returns>
public static Task <T> WhenFailed <T>(this Task <T> task, Action <Task <T> > action, DispatcherBase target)
{
return(task.WhenEnded <T>(t => { if (t.IsFailed)
{
action(t);
}
}, target));
}
/// <summary>
/// Starts the given Task when the tasks ended successfully.
/// </summary>
/// <param name="followingTask">The task to start.</param>
/// <param name="target">The DispatcherBase to start the following task on.</param>
/// <returns>The tasks.</returns>
public static IEnumerable <Task> Then(this IEnumerable <Task> that, Task followingTask, DispatcherBase target)
{
var remaining = that.Count();
var syncRoot = new object();
foreach (var task in that)
{
task.WhenFailed(() =>
{
if (followingTask.ShouldAbort)
{
return;
}
followingTask.Abort();
});
task.WhenSucceeded(() =>
{
if (followingTask.ShouldAbort)
{
return;
}
lock (syncRoot)
{
remaining--;
if (remaining == 0)
{
if (target != null)
{
followingTask.Run(target);
}
else if (ThreadBase.CurrentThread is TaskWorker)
{
followingTask.Run(((TaskWorker)ThreadBase.CurrentThread).TaskDistributor);
}
else
{
followingTask.Run();
}
}
}
});
}
return(that);
}
/// <summary>
/// The given Action will be performed when the task succeeds.
/// </summary>
/// <param name="action">The action to perform.</param>
/// <param name="target">The DispatcherBase to perform the action on.</param>
/// <returns>This task.</returns>
public static Task <T> WhenSucceeded <T>(this Task <T> task, Action <Task <T> > action, DispatcherBase target)
{
Action <Task <T> > perform = t =>
{
if (target == null)
{
action(t);
}
else
{
target.Dispatch(() => { if (t.IsSucceeded)
{
action(t);
}
});
}
};
return(task.WhenEnded <T>(t => { if (t.IsSucceeded)
{
perform(t);
}
}, null));
}
/// <summary>
/// Invokes the given action with the set result of the task when the task succeeded.
/// </summary>
/// <param name="action">The action to perform.</param>
/// <param name="target">The DispatcherBase to perform the action on.</param>
/// <returns>This task.</returns>
public static Task <T> OnResult <T>(this Task <T> task, Action <T> action, DispatcherBase actionTarget)
{
return(task.WhenSucceeded <T>(t => action(t.Result), actionTarget));
}
/// <summary>
/// Invokes the given action with the set result of the task when the task succeeded.
/// </summary>
/// <param name="action">The action to perform.</param>
/// <param name="target">The DispatcherBase to perform the action on.</param>
/// <returns>This task.</returns>
public static Task OnResult <T>(this Task task, Action <T> action, DispatcherBase target)
{
return(task.WhenSucceeded(t => action((T)t.RawResult), target));
}
/// <summary>
/// Starts the given Action when one task has not successfully ended
/// </summary>
/// <param name="action">The action to start.</param>
/// <param name="target">The DispatcherBase to start the following action on.</param>
/// <returns>The tasks.</returns>
public static IEnumerable <Task> WhenFailed(this IEnumerable <Task> that, Action action, DispatcherBase target)
{
var hasFailed = false;
var syncRoot = new object();
foreach (var task in that)
{
task.WhenFailed(() =>
{
lock (syncRoot)
{
if (hasFailed)
{
return;
}
hasFailed = true;
if (target == null)
{
action();
}
else
{
target.Dispatch(() => { action(); });
}
}
});
}
return(that);
}
/// <summary>
/// Starts the given Action when all Tasks ended successfully.
/// </summary>
/// <param name="action">The action to start.</param>
/// <param name="target">The DispatcherBase to start the following action on.</param>
/// <returns>The tasks.</returns>
public static IEnumerable <Task> WhenSucceeded(this IEnumerable <Task> that, Action action, DispatcherBase target)
{
var remaining = that.Count();
var syncRoot = new object();
foreach (var task in that)
{
task.WhenSucceeded(() =>
{
lock (syncRoot)
{
remaining--;
if (remaining == 0)
{
if (target == null)
{
action();
}
else
{
target.Dispatch(() => { action(); });
}
}
}
});
}
return(that);
}
