public static IEnumerable <TSource> GetSources <TSource>(
IIntellisenseSession session,
Func <ITextBuffer, IEnumerable <TSource> > sourceCreator) where TSource : IDisposable
{
return(IntellisenseSourceCache.GetSources(
session.TextView,
GetBuffersForTriggerPoint(session),
sourceCreator));
}
private IEnumerable <OrderedSource> GetOrCreateSources(IList <Exception> failures)
{
var joinableTaskContext = this.JoinableTaskContext;
var orderedSourceProviders = this.orderedSourceProviders;
// Bug #543960: we use a lambda with explicit capturing of the 'CreateSources'
// arguments to prevent the compiler from generating a lambda that captures a
// reference to 'this'. Doing so would cause AsyncQuickInfoSession to be kept
// alive by the IntellisenseSourceCache and leaked until the view closes.
return(IntellisenseSourceCache.GetSources(
this.TextView,
GetBuffersForTriggerPoint().ToList(),
(textBuffer) => CreateSources(
joinableTaskContext,
orderedSourceProviders,
textBuffer,
failures)));
}
private async Task <IList <Exception> > ComputeContentAndStartPresenterAsync(CancellationToken cancellationToken)
{
IntellisenseUtilities.ThrowIfNotOnMainThread(this.joinableTaskContext);
// Read current state.
var originalState = this.State;
(IList <object> items, IList <ITrackingSpan> applicableToSpans, IList <Exception> failures)? results = null;
// Alert subscribers on the UI thread.
this.TransitionTo(QuickInfoSessionState.Calculating);
cancellationToken.ThrowIfCancellationRequested();
// Find and create the sources. Sources cache is smart enough to
// invalidate on content-type changed and free on view close.
var sources = IntellisenseSourceCache.GetSources(
this.TextView,
GetBuffersForTriggerPoint().ToList(),
this.CreateSources);
// Compute quick info items. This method switches off the UI thread.
// From here on out we're on an arbitrary thread.
results = await ComputeContentAsync(sources, cancellationToken).ConfigureAwait(false);
cancellationToken.ThrowIfCancellationRequested();
// Update our content, or put the empty list if there is none.
Volatile.Write(
ref this.content,
results != null ? ImmutableList.CreateRange(results.Value.items) : ImmutableList <object> .Empty);
await StartUIThreadEpilogueAsync(originalState, results?.applicableToSpans, cancellationToken).ConfigureAwait(false);
return(results?.failures);
}
