public OutputtersFlow CreateFlow(string storageName)
{
if (string.IsNullOrWhiteSpace(storageName))
{
storageName = _defaultStorageName;
_logger.Info("Storage name is empty, using the default value.");
}
var outputtersFunc = _outputtersAsync.Select(outputterAsync =>
{
return(new Action <RatingDataContainer>(result => Console.WriteLine("Got result.")));
});
var outputtersFlow = new OutputtersFlow(outputtersFunc.Take(1));
_logger.Info("Constructed outputters pipeline.");
return(outputtersFlow);
}
private DataflowPipeline ConstructPipeline(string storageName)
{
// Input component work.
InputtersFlow inputtersFlow = InputManagerAsync.CreateFlow(storageName);
// Crawlers component work.
CrawlersFlow crawlersFlow = CrawlersManagerAsync.CreateFlow();
// Appraisers component work.
AppraisersFlow appraisersFlow = AppraisersManagerAsync.CreateFlow();
// Output component work.
OutputtersFlow outputtersFlow =
OutputManagerAsync.CreateFlow(storageName: string.Empty);
// Constructing pipeline.
inputtersFlow.LinkTo(crawlersFlow);
crawlersFlow.LinkTo(appraisersFlow);
appraisersFlow.LinkTo(outputtersFlow);
return(new DataflowPipeline(inputtersFlow, outputtersFlow));
}
public async Task <bool> SaveResults(OutputtersFlow outputtersFlow, string storageName)
{
if (string.IsNullOrWhiteSpace(storageName))
{
storageName = _defaultStorageName;
const string message = "Storage name is empty, using the default value.";
_logger.Info(message);
GlobalMessageHandler.OutputMessage(message);
}
// Make sure that the final pipeline task is completed.
await outputtersFlow.CompletionTask;
IReadOnlyList <RatingDataContainer> results = outputtersFlow.Results.ToReadOnlyList();
IReadOnlyList <List <RatingDataContainer> > resultsToSave = results
.GroupBy(rating => rating.RatingId, (key, group) => group.ToList())
.ToReadOnlyList();
resultsToSave
.AsParallel()
.ForAll(rating => rating.Sort((x, y) => y.RatingValue.CompareTo(x.RatingValue)));
IReadOnlyList <Task <bool> > resultTasks = _outputtersAsync
.Select(outputterAsync => TryGetRatings(outputterAsync, resultsToSave, storageName))
.ToReadOnlyList();
IReadOnlyList <bool> statuses = await Task.WhenAll(resultTasks);
if (statuses.Count > 0 && statuses.All(statis => statis))
{
_logger.Info($"Successfully saved all results to \"{storageName}\".");
return(true);
}
_logger.Info($"Could not save some results to \"{storageName}\".");
return(false);
}
private async Task <ServiceStatus> SaveResults(OutputtersFlow outputtersFlow)
{
try
{
bool status = await OutputManagerAsync.SaveResults(
outputtersFlow, storageName : string.Empty
);
if (status)
{
GlobalMessageHandler.OutputMessage("Ratings was saved successfully.");
return(ServiceStatus.Ok);
}
GlobalMessageHandler.OutputMessage("Ratings was not saved.");
return(ServiceStatus.OutputUnsaved);
}
catch (Exception ex)
{
_logger.Error(ex, "Exception occured during saving results work.");
return(ServiceStatus.OutputError);
}
}
