protected override async Task ExecuteAsync(CancellationToken stoppingToken)
{
// note that we don't want to call this on each loop iteration,
// or we will create a backlog of waits that must be satisfied by the controller.
// we only want one outstanding at any time
var wait = _trigger.WaitAsync();
while (!stoppingToken.IsCancellationRequested)
{
try
{
var requests = await _requestStore.List(stoppingToken);
await Task.WhenAll(requests.Select(HandleRequest));
}
catch (Exception ex) when(!(ex is TaskCanceledException))
{
_logger.LogError(ex, $"Unexpected error in {nameof(ScaleUpProcessorHost)} main loop");
}
var completed = await Task.WhenAny(Task.Delay(ResizeCheckDelay, stoppingToken), wait);
if (completed == wait)
{
// if our wait was completed we need to start a new one
wait = _trigger.WaitAsync();
}
}
}
