private static string GetCacheKey(string langtag)
{
//return string.Format("po:{0}", langtag).ToLowerInvariant();
// The above will cause a new string to be allocated.
// So subsituted with the following code.
// Obtain the cache key without allocating a new string (except for first time).
// As this method is a high-frequency method, the overhead in the (lock-free) dictionary
// lookup is thought to outweigh the potentially large number of temporary string allocations
// and the consequently hastened garbage collections.
return(LanguageTag.GetCachedInstance(langtag).GlobalKey);
}
public virtual ConcurrentDictionary <string, LanguageTag> GetAppLanguages()
{
ConcurrentDictionary <string, LanguageTag> AppLanguages = (ConcurrentDictionary <string, LanguageTag>)System.Web.HttpRuntime.Cache["i18n.AppLanguages"];
if (AppLanguages != null)
{
return(AppLanguages);
}
lock (Sync)
{
AppLanguages = (ConcurrentDictionary <string, LanguageTag>)System.Web.HttpRuntime.Cache["i18n.AppLanguages"];
if (AppLanguages != null)
{
return(AppLanguages);
}
AppLanguages = new ConcurrentDictionary <string, LanguageTag>();
// Insert into cache.
// NB: we do this before actually populating the collection. This is so that any changes to the
// folders before we finish populating the collection will cause the cache item to be invalidated
// and hence reloaded on next request, and so will not be missed.
System.Web.HttpRuntime.Cache.Insert("i18n.AppLanguages", AppLanguages, _translationRepository.GetCacheDependencyForAllLanguages());
// Populate the collection.
List <string> languages = _translationRepository.GetAvailableLanguages().Select(x => x.LanguageShortTag).ToList();
// Ensure default language is included in AppLanguages where appropriate.
if (LocalizedApplication.Current.MessageKeyIsValueInDefaultLanguage &&
!languages.Any(x => LocalizedApplication.Current.DefaultLanguageTag.Equals(x)))
{
languages.Add(LocalizedApplication.Current.DefaultLanguageTag.ToString());
}
foreach (var langtag in languages)
{
if (IsLanguageValid(langtag))
{
AppLanguages[langtag] = LanguageTag.GetCachedInstance(langtag);
}
}
// Done.
return(AppLanguages);
}
}
