protected override async Task ExecuteAsync(CancellationToken stoppingToken)
{
while (!stoppingToken.IsCancellationRequested)
{
EgressRequest egressRequest = await _queue.DequeueAsync(stoppingToken);
//Note we do not await these tasks, but we do limit how many can be executed at the same time
_ = Task.Run(() => ExecuteEgressOperation(egressRequest, stoppingToken), stoppingToken);
}
}
public ValueTask EnqueueAsync(
EgressRequest workItem)
{
if (workItem == null)
{
throw new ArgumentNullException(nameof(workItem));
}
return(_queue.Writer.WriteAsync(workItem));
}
private async Task ExecuteEgressOperation(EgressRequest egressRequest, CancellationToken stoppingToken)
{
//We have two stopping tokens, one per item that can be triggered via Delete
//and if we are stopping the service
using (CancellationTokenSource linkedTokenSource =
CancellationTokenSource.CreateLinkedTokenSource(egressRequest.CancellationTokenSource.Token, stoppingToken))
{
CancellationToken token = linkedTokenSource.Token;
token.ThrowIfCancellationRequested();
var result = await egressRequest.EgressOperation.ExecuteAsync(_serviceProvider, token);
//It is possible that this operation never completes, due to infinite duration operations.
_operationsStore.CompleteOperation(egressRequest.OperationId, result);
}
}