I've read most articles I can find about IHostApplicationLifetime and CancellationToken's in .NET Core 3.1, but I cannot find a reason why this is not working.
I have a simple BackgroundService which look like the following:
public class AnotherWorker : BackgroundService
{
private readonly IHostApplicationLifetime _hostApplicationLifetime;
public AnotherWorker(IHostApplicationLifetime hostApplicationLifetime)
{
_hostApplicationLifetime = hostApplicationLifetime;
}
public override Task StartAsync(CancellationToken cancellationToken)
{
Console.WriteLine($"Process id: {Process.GetCurrentProcess().Id}");
_hostApplicationLifetime.ApplicationStarted.Register(() => Console.WriteLine("Started"));
_hostApplicationLifetime.ApplicationStopping.Register(() => Console.WriteLine("Stopping"));
_hostApplicationLifetime.ApplicationStopped.Register(() => Console.WriteLine("Stopped"));
return Task.CompletedTask;
}
protected override Task ExecuteAsync(CancellationToken stoppingToken)
{
Console.WriteLine("Executing");
return Task.CompletedTask;
}
public override async Task StopAsync(CancellationToken cancellationToken)
{
// This actually prints "Stop. IsCancellationRequested: False". Why?
Console.WriteLine($"Stop. IsCancellationRequested: {cancellationToken.IsCancellationRequested}");
await base.StopAsync(cancellationToken);
}
}
The ConsoleLifetime is added by default, which listens to Ctrl+C and SIGTERM and informs the IHostApplicationLifetime. I guess IHostApplicationLifetime in turn should then cancel all CancellationTokens? Here's a good article on the subject. So why is the output from the above code snippet the following?
Hosting starting
Started
Hosting started
(sends SIGTERM with `kill -s TERM <process_id>`)
Applicationis shuting down...
Stop. IsCancellationRequested: False
Stopped
Hosting stopped
I would expect it to log Stop. IsCancellationRequested: True
I want to be able to pass this token around, to other service calls, for them to have the capability to shutdown gracefully.
