private static Objects.LatestPageIndex GetLatestPageItemIndex(string languageCode) { string fileName = string.Format("AgilityPageIndex_{0}.bin", languageCode); string pageIndexFilePath = Path.Combine(BaseCache.GetLocalContentFilePath(), fileName); Objects.LatestPageIndex index = AgilityContext.HttpContext.Items[fileName] as Objects.LatestPageIndex; if (index == null) { lock (_pageIndexLock) { index = AgilityContext.HttpContext.Items[fileName] as Objects.LatestPageIndex; if (index == null) { index = BaseCache.ReadFile <Objects.LatestPageIndex>(pageIndexFilePath); if (index == null) { index = new Objects.LatestPageIndex(); } int maxVersionID = index.MaxVersionID; var indexDelta = ServerAPI.GetLatestPageItemIndex(maxVersionID, languageCode); if (indexDelta != null) { foreach (var item in indexDelta) { if (item.MaxVersionID > index.MaxVersionID) { index.MaxVersionID = item.MaxVersionID; } index.Index[item.PageID] = new Objects.LatestPageIndexItem() { MaxVersionID = item.MaxVersionID, PageID = item.PageID, Downloaded = false }; } BaseCache.WriteFile(index, pageIndexFilePath); AgilityContext.HttpContext.Items[fileName] = index; } } } } return(index); }