static string AddNewTask(BackgroundTaskStatus backgroundTaskStatus)
{
while (true)
{
var correlationId = Guid.NewGuid().ToString();
if (TaskStatuses.TryAdd(correlationId, backgroundTaskStatus))
{
return(correlationId);
}
}
}
public static (string correlationId, BackgroundTaskStatus backgroundTaskStatus) Run(Func <Task> task, string operation, CancellationToken cancellationToken)
{
BackgroundTaskStatus backgroundTaskStatus = new BackgroundTaskStatus(BackgroundTaskRunStatus.Running, operation);
string correlationId = AddNewTask(backgroundTaskStatus);
Task.Run(
() => task().ContinueWith(
t =>
{
BackgroundTaskStatus GetNewStatus()
{
switch (t.Status)
{
case TaskStatus.Faulted:
Exception exception = t.Exception is AggregateException aggregateException
? aggregateException.InnerException
: t.Exception;
return(new BackgroundTaskStatus(BackgroundTaskRunStatus.Failed, operation, Option.Some(exception)));
case TaskStatus.Canceled:
return(new BackgroundTaskStatus(BackgroundTaskRunStatus.Cancelled, operation));
case TaskStatus.RanToCompletion:
return(new BackgroundTaskStatus(BackgroundTaskRunStatus.Completed, operation));
default:
return(new BackgroundTaskStatus(BackgroundTaskRunStatus.Unknown, operation));
}
}
BackgroundTaskStatus newStatus = GetNewStatus();
if (!TaskStatuses.TryUpdate(correlationId, newStatus, backgroundTaskStatus))
{
// This should never happen.
BackgroundTaskStatus currentTask = GetStatus(correlationId);
throw new InvalidOperationException($"Failed to update background task status to - {newStatus}. Current task = {currentTask}");
}
}, cancellationToken),
cancellationToken);
return(correlationId, backgroundTaskStatus);
}