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 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 dbCache = db.TokenCacheEntries.FirstOrDefault(c => c.userObjId == userObjId);
// if the in-memory copy is older than the persistent copy, update the in-memory copy
if (dbCache.LastWrite > Cache.LastWrite)
Cache = dbCache;
}
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)
{
// retrieve last write from the DB
Cache = db.TokenCacheEntries.FirstOrDefault(e => e.userObjId == userObjId);
if (Cache == null)
{
Cache = new TokenCacheEntry
{
userObjId = userObjId,
};
}
Cache.LastWrite = DateTime.Now;
Cache.cacheBits = this.Serialize();
//// update the DB and the lastwrite
db.Entry(Cache).State = Cache.TokenCacheEntryID == 0 ? EntityState.Added : EntityState.Modified;
db.SaveChanges();
this.HasStateChanged = false;
}
}
