// 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 = _memCache.FirstOrDefault(c => c.webUserUniqueId == _userId);
this.HasStateChanged = true; // Fake DB
}
else
{ // retrieve last write from the db
var status = from e in _memCache
where (e.webUserUniqueId == _userId)
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 = _memCache.FirstOrDefault(c => c.webUserUniqueId == _userId);
}
}
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 PerWebUserCache
{
webUserUniqueId = _userId,
cacheBits = this.Serialize(),
LastWrite = DateTime.Now
};
//// update the db and the lastwrite
_db.Entry(_cache).State = _cache.EntryId == 0 ? EntityState.Added : EntityState.Modified;
_db.SaveChanges();
this.HasStateChanged = false;
}
}