async Task StartProcessing(CancellationToken token)
{
while (!token.IsCancellationRequested)
{
while (toProcess.TryPeek(out var request))
{
try
{
log.Info($"Processing request with ID {request.RequestId} and estimated processing time {request.EstimatedProcessingTime}.");
request.StartedAt = DateTime.UtcNow;
#region failed-scenario
// emulate failure
if (DateTime.UtcNow.Ticks % 2 == 0)
{
throw new Exception("Some exception during processing.");
}
#endregion
// process
var estimatedProcessingTime = TimeSpan.Parse(request.EstimatedProcessingTime);
await Task.Delay(estimatedProcessingTime, token)
.ConfigureAwait(false);
log.Info($"Request with ID {request.RequestId} processed.");
request.Status = Status.Finished.ToString();
request.FinishedAt = DateTime.UtcNow;
await table.ExecuteAsync(TableOperation.Merge(request), token)
.ConfigureAwait(false);
toProcess.TryDequeue(out request);
var processingFinished = new LongProcessingFinished
{
Id = request.RequestId
};
await endpoint.Publish(processingFinished)
.ConfigureAwait(false);
}
catch (Exception ex)
{
log.Info($"Request with ID {request.RequestId} threw an exception.");
request.Status = Status.Failed.ToString();
await table.ExecuteAsync(TableOperation.Merge(request), token)
.ConfigureAwait(false);
toProcess.TryDequeue(out request);
var processingFailed = new LongProcessingFailed
{
Id = request.RequestId,
Reason = ex.Message
};
await endpoint.Publish(processingFailed)
.ConfigureAwait(false);
}
}
}
}
public Task Handle(LongProcessingFailed message, IMessageHandlerContext context)
{
MarkAsComplete();
return(Task.FromResult(0));
}
