// constructor public AdalTokenCache(string user) { // associate the cache to the current user of the web app User = user; this.AfterAccess = AfterAccessNotification; this.BeforeAccess = BeforeAccessNotification; this.BeforeWrite = BeforeWriteNotification; // look up the entry in the DB Cache = db.UserTokenCacheList.FirstOrDefault(c => c.webUserUniqueId == User); // place the entry in memory this.Deserialize((Cache == null) ? null : Cache.cacheBits); }
// Notification raised before ADAL accesses the cache. // This is your chance to update the in-memory copy from the DB, if the in-memory version is stale void BeforeAccessNotification(TokenCacheNotificationArgs args) { if (Cache == null) { // first time access Cache = db.UserTokenCacheList.FirstOrDefault(c => c.webUserUniqueId == User); } else { // retrieve last write from the DB var status = from e in db.UserTokenCacheList where (e.webUserUniqueId == User) select new { LastWrite = e.LastWrite }; // if the in-memory copy is older than the persistent copy if (status.First().LastWrite > Cache.LastWrite) //// read from from storage, update in-memory copy { Cache = db.UserTokenCacheList.FirstOrDefault(c => c.webUserUniqueId == User); } } this.Deserialize((Cache == null) ? null : Cache.cacheBits); }
// Notification raised after ADAL accessed the cache. // If the HasStateChanged flag is set, ADAL changed the content of the cache void AfterAccessNotification(TokenCacheNotificationArgs args) { // if state changed if (this.HasStateChanged) { Cache = db.UserTokenCacheList.FirstOrDefault(x => x.webUserUniqueId == User); if(null == Cache) { Cache = new UserTokenCache() { webUserUniqueId = User }; db.UserTokenCacheList.Add(Cache); } Cache.cacheBits = this.Serialize(); Cache.LastWrite = DateTime.Now; db.SaveChanges(); this.HasStateChanged = false; } }