public TokenDbCache(string userObjectId) { // associate the cache to the current user of the web app userObjId = userObjectId; this.AfterAccess = AfterAccessNotification; this.BeforeAccess = BeforeAccessNotification; this.BeforeWrite = BeforeWriteNotification; // look up the entry in the DB Cache = db.TokenCacheEntries.FirstOrDefault(c => c.userObjId == userObjId); // place the entry in memory 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 = new TokenCacheEntry { userObjId = userObjId, cacheBits = this.Serialize(), LastWrite = DateTime.Now }; //// update the DB and the lastwrite db.Entry(Cache).State = Cache.TokenCacheEntryID == 0 ? EntityState.Added : EntityState.Modified; db.SaveChanges(); this.HasStateChanged = false; } }
// 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.TokenCacheEntries.FirstOrDefault(c => c.userObjId == userObjId); } else { // retrieve last write from the DB var status = from e in db.TokenCacheEntries where (e.userObjId == userObjId) orderby e.LastWrite descending select e; // 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 = status.First(); } } this.Deserialize((Cache == null) ? null : Cache.cacheBits); }