private static void Seed(IServiceProvider serviceProvider)
{
using (var dbContext = serviceProvider.GetService <NewsAggregatorDBContext>())
{
dbContext.Database.Migrate();
if (dbContext.DataSources.AnyAsync().Result)
{
return;
}
dbContext.DataSources.Add(DataSourceAggregate.Create("BBC", "Top stories", "http://feeds.bbci.co.uk/news/rss.xml"));
dbContext.SaveChanges();
}
}
private async Task ExtractArticlesFromFeed(DataSourceAggregate datasource, CancellationToken cancellationToken)
{
var reader = XmlReader.Create(datasource.Url);
var feed = SyndicationFeed.Load(reader);
reader.Close();
var result = new List <ArticleAggregate>();
foreach (var item in feed.Items.OrderBy(i => i.PublishDate))
{
if (!datasource.IsArticleExtracted(item.PublishDate))
{
var article = ArticleAggregate.Create(item.Id, item.Title.Text, item.Summary.Text, null, "en", datasource.Id, item.PublishDate);
result.Add(article);
}
}
if (!result.Any())
{
return;
}
using (var transactionScope = new TransactionScope(TransactionScopeAsyncFlowOption.Enabled))
{
foreach (var article in result)
{
await _articleRepository.Add(article, cancellationToken);
}
await _articleRepository.SaveChanges(cancellationToken);
transactionScope.Complete();
}
foreach (var article in result)
{
await _busControl.Publish((ArticleAddedEvent)article.DomainEvts.First(), cancellationToken);
}
// await _articleManager.TrainArticles(result.Select(r => r.Language).Distinct(), cancellationToken);
var lastArticle = result.OrderByDescending(a => a.PublishDate).FirstOrDefault();
if (lastArticle != null)
{
datasource.AddHistory(lastArticle.PublishDate, result.Count());
}
}
