private IEnumerator <int> ProcessUpdateLookups(AsyncEnumerator asyncEnumerator, QuotePage[] pages)
{
QuotePage page;
for (int i = 0; i < pages.Length; i++)
{
page = pages[i];
LookupResolver.BeginNormalizeTopicOmitChecks(page.Topic, page.Culture,
asyncEnumerator.End(AsyncEnumeratorDiscardGroup, LookupResolver.EndNormalizeTopic), page);
}
IAsyncResult result;
bool updateQuotes = false;
for (int i = 0; i < pages.Length; i++)
{
yield return(1);
if (asyncEnumerator.IsCanceled())
{
yield break;
}
result = asyncEnumerator.DequeueAsyncResult();
page = result.AsyncState as QuotePage;
try
{
page.Topic = LookupResolver.EndNormalizeTopic(result);
page.Uri = LookupResolver.GetUri(page.Topic, page.Culture);
}
catch
{
OnTopicNotFound(new TopicNotFoundEventArgs(page.Topic, page.Culture));
yield break;
}
lock (_lookupsInProgress)
{
if (!_lookupsInProgress.Contains(page.Uri))
{
_lookupsInProgress.Add(page.Uri);
updateQuotes = true;
}
}
if (updateQuotes)
{
QuoteCollector.UpdateQuotesAsync(page);
}
}
lock (_asyncEnumerators)
{
_asyncEnumerators.Remove(asyncEnumerator);
}
}
private IEnumerator <int> ProcessLookup(AsyncEnumerator asyncEnumerator, string topic, CultureInfo culture)
{
LookupResolver.BeginNormalizeTopicOmitChecks(topic, culture,
asyncEnumerator.End(AsyncEnumeratorDiscardGroup, LookupResolver.EndNormalizeTopic), null);
yield return(1);
if (asyncEnumerator.IsCanceled())
{
yield break;
}
try
{
topic = LookupResolver.EndNormalizeTopic(asyncEnumerator.DequeueAsyncResult());
}
catch
{
OnTopicNotFound(new TopicNotFoundEventArgs(topic, culture));
yield break;
}
Uri uri = LookupResolver.GetUri(topic, culture);
bool collectQuotes = false;
lock (_playlist)
{
if (_playlist.Contains(uri))
{
OnTopicAlreadyExists(new TopicAlreadyExistsEventArgs(topic, culture));
yield break;
}
}
lock (_lookupsInProgress)
{
if (!_lookupsInProgress.Contains(uri))
{
_lookupsInProgress.Add(uri);
collectQuotes = true;
}
}
if (collectQuotes)
{
QuoteCollector.CollectQuotesAsync(topic, culture, uri);
}
lock (_asyncEnumerators)
{
_asyncEnumerators.Remove(asyncEnumerator);
}
}
public LookupManager(Playlist playlist, CultureMapper cultureMapper)
{
// precondition checking
if (playlist == null || cultureMapper == null)
{
throw new ArgumentNullException();
}
_cultureMapper = cultureMapper;
_playlist = playlist;
_quoteCollector = new QuoteCollector(playlist, cultureMapper);
RegisterQuoteCollectorEventHandler();
}
public void CancelAllPendingLookups()
{
QuoteCollector.CancelAllPendingLookups();
lock (_asyncEnumerators)
{
foreach (AsyncEnumerator asyncEnumerator in _asyncEnumerators)
{
asyncEnumerator.Cancel(null);
asyncEnumerator.DiscardGroup(AsyncEnumeratorDiscardGroup);
}
_asyncEnumerators.Clear();
}
lock (_lookupsInProgress)
{
_lookupsInProgress.Clear();
}
IsBusy = false;
}