public OperationStateBase(OperationError error, double progress, bool isCancelled, ModelSource source = ModelSource.Unknown, ModelIdentifierBase id = null, double resultProgress = 0)
{
Error = error;
Progress = progress;
IsCancelled = isCancelled;
ResultSource = source;
ResultIdentifier = id;
ResultProgress = resultProgress;
}
protected override void WriteImplementation(ModelIdentifierBase id, UpdateContainer update, ModelSource target, IObserver <IOperationState <object> > operation, CancellationToken ct = default)
{
if (id is BbcArticleIdentifier articleId)
{
var original = (NewsArticle)update.Original;
var updated = (NewsArticle)update.Updated;
if (updated.Title != original.Title)
{
Debug.WriteLine("Title updated from '" + original.Title + "' to '" + updated.Title);
}
operation.OnCompleteResult(id, id, 100);
}
}
protected override void ParseImplementation(ModelIdentifierBase id, Stream data, IObserver <IOperationState <object> > target)
{
var progress = 1.0;
target.OnNextProgress(progress);
var doc = XDocument.Load(data);
progress = 20;
// TODO: Try to get existing list from repository
var list = new List <NewsArticle>();
target.OnIncompleteResult(list, AllArticlesId, progress, 10);
var items = doc.Descendants("item").ToList();
var itemProgress = (100.0 - progress) / (items.Count() + 1);
foreach (var item in items)
{
var link = item.Element("link").Value;
var article = new NewsArticle
{
Url = new Uri(link),
Title = item.Element("title").Value
};
var thisId = new BbcArticleIdentifier(article);
progress = thisId.Equals(id) ? 100 : progress + itemProgress;
target.OnCompleteResult(article, thisId, progress);
list.Add(article);
}
progress += itemProgress;
target.OnCompleteResult(list, AllArticlesId, progress);
if (progress < 100)
{
target.OnNextProgress(100);
}
target.OnCompleted();
}
public IObservable <IOperationState <Stream> > Load(ModelIdentifierBase id)
{
return(Observable.Generate(0, p => p <= 100, p => ++ p,
p => new OperationState <Stream>(
p == 100
? new MemoryStream(
Encoding.UTF8.GetBytes("Article from server"),
false
)
: null,
p
),
p => TimeSpan.FromMilliseconds(50)));
/*
* if (source == ModelSource.Disk) {
* return Observable.Generate(0, p => p <= 100, p => ++p,
* p => new OperationState<Stream>(p == 100 ? Encoding.UTF8.GetBytes("Article from disk").AsBuffer() : null, p),
* p => TimeSpan.FromMilliseconds(1));
* } else {
* }*/
}
public OperationState(T result = null, double progress = 0, OperationError error = null, bool isCancelled = false, ModelSource source = ModelSource.Unknown, ModelIdentifierBase id = null, double resultProgress = 0) : base(error, progress, isCancelled, source, id, resultProgress)
{
Result = result;
}
protected override void ParseImplementation(ModelIdentifierBase id, Stream data, IObserver <IOperationState <object> > target, CancellationToken ct)
{
// Use the parser for this model
new BbcParser().Parse(id, data, target);
}
protected override void LoadImplementation(ModelIdentifierBase id, IObserver <IOperationState <Stream> > target, CancellationToken ct)
{
// Check that this model is supposed to be loaded from the bbc
new NetworkRequestHander().Get(new Uri("http://feeds.bbci.co.uk/news/rss.xml"), target);
}