Last active
August 22, 2022 04:13
-
-
Save Foxtrek64/a0b6f58342066327f7b2eab3d832f1fb to your computer and use it in GitHub Desktop.
Open source Task-based Code Activity for use with Workflow Foundation. Licensed under the MIT license.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
/* | |
* AsyncTaskCodeActivity | |
* | |
* Copyright (c) LuzFaltex, LLC. | |
* All rights reserved. | |
* | |
* MIT License | |
* | |
* Permission is hereby granted, free of charge, to any person obtaining a copy of this | |
* software and associated documentation files (the "Software"), to deal in the Software | |
* without restriction, including without limitation the rights to use, copy, modify, merge, | |
* publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons | |
* to whom the Software is furnished to do so, subject to the following conditions: | |
* | |
* The above copyright notice and this permission notice shall be included in all copies or | |
* substantial portions of the Software. | |
* | |
* THE SOFTWARE IS PROVIDED *AS IS*, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, | |
* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR | |
* PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE | |
* FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR | |
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER | |
* DEALINGS IN THE SOFTWARE. | |
*/ | |
using System.Runtime.ExceptionServices; | |
using System.Threading; | |
using System.Threading.Tasks; | |
namespace System.Activities | |
{ | |
public abstract class AsyncTaskCodeActivity<T> : AsyncCodeActivity<T> | |
{ | |
protected sealed override IAsyncResult BeginExecute(AsyncCodeActivityContext context, AsyncCallback callback, object state) | |
{ | |
var cts = new CancellationTokenSource(); | |
context.UserState = cts; | |
var task = ExecuteAsync(context, cts.Token); | |
var tcs = new TaskCompletionSource<T>(state); | |
task.ContinueWith(t => | |
{ | |
if (t.IsFaulted) | |
tcs.TrySetException(t.Exception.InnerExceptions); | |
else if (t.IsCanceled) | |
tcs.TrySetCanceled(); | |
else | |
tcs.TrySetResult(t.Result); | |
callback?.Invoke(tcs.Task); | |
}); | |
return tcs.Task; | |
} | |
protected sealed override T EndExecute(AsyncCodeActivityContext context, IAsyncResult result) | |
{ | |
var task = (Task<T>)result; | |
try | |
{ | |
return task.Result; | |
} | |
catch (OperationCanceledException) | |
{ | |
if (context.IsCancellationRequested) | |
context.MarkCanceled(); | |
throw; | |
} | |
catch (AggregateException ex) | |
{ | |
ExceptionDispatchInfo.Capture(ex.InnerException).Throw(); | |
throw; | |
} | |
} | |
protected override void Cancel(AsyncCodeActivityContext context) | |
{ | |
var cts = (CancellationTokenSource)context.UserState; | |
cts.Cancel(); | |
} | |
protected abstract Task<T> ExecuteAsync(AsyncCodeActivityContext context, CancellationToken cancellationToken); | |
} | |
public abstract class AsyncTaskCodeActivity : AsyncCodeActivity | |
{ | |
private struct VoidResult { } | |
protected override IAsyncResult BeginExecute(AsyncCodeActivityContext context, AsyncCallback callback, object state) | |
{ | |
var cts = new CancellationTokenSource(); | |
context.UserState = cts; | |
var task = ExecuteAsync(context, cts.Token); | |
var tcs = new TaskCompletionSource<VoidResult>(state); | |
task.ContinueWith(t => | |
{ | |
if (t.IsFaulted) | |
tcs.TrySetException(t.Exception.InnerExceptions); | |
else if (t.IsCanceled) | |
tcs.TrySetCanceled(); | |
else | |
tcs.TrySetResult(default); | |
callback?.Invoke(tcs.Task); | |
}); | |
return tcs.Task; | |
} | |
protected override void EndExecute(AsyncCodeActivityContext context, IAsyncResult result) | |
{ | |
var task = (Task)result; | |
try | |
{ | |
task.Wait(); | |
} | |
catch (TaskCanceledException) | |
{ | |
if (context.IsCancellationRequested) | |
context.MarkCanceled(); | |
throw; | |
} | |
catch (AggregateException ex) | |
{ | |
ExceptionDispatchInfo.Capture(ex.InnerException).Throw(); | |
throw; | |
} | |
} | |
protected override void Cancel(AsyncCodeActivityContext context) | |
{ | |
var cts = (CancellationTokenSource)context.UserState; | |
cts.Cancel(); | |
} | |
protected abstract Task ExecuteAsync(AsyncCodeActivityContext context, CancellationToken cancellationToken); | |
} | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment