/// <summary>
/// diagnostic instrument to find out race in MeftHostService
/// </summary>
private void CrashIfSyntaxTreeFactoryServiceDoesntExistForCSharpOrVB <TExtension, TMetadata>(IEnumerable <Lazy <TExtension, TMetadata> > services)
{
if (typeof(TExtension) != typeof(ILanguageServiceFactory))
{
return;
}
var hasLanguageService = false;
var hasCSharpService = false;
var hasVBService = false;
foreach (var lazy in services)
{
var metadata = lazy.Metadata as LanguageServiceMetadata;
if (metadata == null)
{
continue;
}
if (metadata.Language != LanguageNames.CSharp && metadata.Language != LanguageNames.VisualBasic)
{
continue;
}
hasLanguageService = true;
if (metadata.ServiceType != typeof(ISyntaxTreeFactoryService).AssemblyQualifiedName)
{
continue;
}
if (metadata.Language == LanguageNames.CSharp)
{
hasCSharpService = true;
}
if (metadata.Language == LanguageNames.VisualBasic)
{
hasVBService = true;
}
if (hasCSharpService && hasVBService)
{
break;
}
}
if (!hasLanguageService || (hasVBService && hasCSharpService))
{
return;
}
var tempLanguages = this.languages == null ? null : this.languages.ToArray();
var tempServices = services.Select(lz => ValueTuple.Create(lz.Value, lz.Metadata)).ToArray();
var tempExportMap = this.exportsMap.Select(kv => ValueTuple.Create(kv.Key, kv.Value == null ? null : kv.Value as IEnumerable <object>))
.Select(t => ValueTuple.Create(t.Item1, t.Item2 == null ? null : t.Item2.ToArray())).ToArray();
var tempServices2 = services;
ExceptionHelpers.Crash(new Exception("Crash"));
GC.KeepAlive(tempLanguages);
GC.KeepAlive(tempServices);
GC.KeepAlive(tempServices2);
GC.KeepAlive(tempExportMap);
}
