/// <inheritdoc />
protected sealed override void Execute(
UIApplication app,
TParameter parameter,
IExternalEventResultHandler <TResult> resultHandler)
{
resultHandler.Wait(() => Handle(app, parameter));
}
/// <summary>
/// Await a <see cref="Task{TResult}"/>
/// </summary>
/// <typeparam name="TResult">The type of the result</typeparam>
/// <param name="resultHandler"></param>
/// <param name="task">The task to wait</param>
public static async void Await <TResult>(
this IExternalEventResultHandler <TResult> resultHandler,
Task <TResult> task)
{
try
{
var result = await task;
if (task.IsCompleted)
{
resultHandler.SetResult(result);
}
if (task.IsCanceled)
{
resultHandler.Cancel();
}
if (task.IsFaulted)
{
resultHandler.ThrowException(task.Exception ?? new Exception("Unknown Exception"));
}
}
catch (Exception e)
{
resultHandler.ThrowException(e);
}
}
/// <inheritdoc />
public Task <TResult> Prepare(TParameter parameter)
{
Parameter = parameter;
var tcs = new TaskCompletionSource <TResult>();
ResultHandler = new DefaultResultHandler <TResult>(tcs);
return(tcs.Task);
}
/// <summary>
/// Wait for an sync delegate to complete
/// </summary>
/// <typeparam name="TResult"></typeparam>
/// <param name="resultHandler"></param>
/// <param name="function"></param>
public static void Wait <TResult>(this IExternalEventResultHandler <TResult> resultHandler, Func <TResult> function)
{
try
{
var result = function();
resultHandler.SetResult(result);
}
catch (Exception e)
{
resultHandler.ThrowException(e);
}
}
/// <summary>
/// Await a <see cref="Task{TResult}"/>
/// </summary>
/// <typeparam name="TResult"></typeparam>
/// <param name="resultHandler"></param>
/// <param name="source"></param>
/// <returns></returns>
public static IExternalEventResultHandler <TResult> Await <TResult>(
this IExternalEventResultHandler <TResult> resultHandler,
Task <TResult> source)
{
source.ContinueWith(task =>
{
if (task.IsCompleted)
{
resultHandler.SetResult(task.Result);
}
else if (task.IsFaulted)
{
resultHandler.ThrowException(task.Exception ?? new Exception("Unknown Exception"));
}
else if (task.IsCanceled)
{
resultHandler.Cancel();
}
});
return(resultHandler);
}
/// <summary>
/// Override this method to execute some business code
/// </summary>
/// <param name="app">The revit top-level object, <see cref="UIApplication" /></param>
/// <param name="parameter">The parameter passed in</param>
/// <param name="resultHandler">The result handler</param>
protected abstract void Execute(UIApplication app,
TParameter parameter,
IExternalEventResultHandler <TResult> resultHandler);
