// 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)
{
// check for an existing entry
Cache = db.PerUserTokenCacheList.FirstOrDefault(c => c.webUserUniqueId == User);
if (Cache == null)
{
// if no existing entry for that user, create a new one
Cache = new PerUserTokenCache
{
webUserUniqueId = User,
};
}
// update the cache contents and the last write timestamp
Cache.cacheBits = this.Serialize();
Cache.LastWrite = DateTime.Now;
// update the DB with modification or new entry
db.Entry(Cache).State = Cache.Id == 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)
{
using (DataAccess db = new DataAccess()) {
if (_cache == null)
{
// first time access
_cache = db.PerUserTokenCacheList.AsNoTracking().FirstOrDefault(c => c.WebUserUniqueId == _user);
}
else // retrieve last write from the DB
{
var status =
from e in db.PerUserTokenCacheList
where (e.WebUserUniqueId == _user)
select new { LastWrite = e.LastWrite };
// if the in-memory copy is older than the persistent copy
if (status.AsNoTracking().First().LastWrite > _cache.LastWrite)
{
//// read from from storage, update in-memory copy
_cache = db.PerUserTokenCacheList.AsNoTracking().FirstOrDefault(c => c.WebUserUniqueId == _user);
}
}
}
this.Deserialize((_cache == null) ? null : _cache.CacheBits);
}
// 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.PerUserTokenCacheList.FirstOrDefault(c => c.webUserUniqueId == User);
// place the entry in memory
this.Deserialize((Cache == null) ? null : Cache.cacheBits);
}
// 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;
using (DataAccess db = new DataAccess()) {
// look up the entry in the DB
_cache = db.PerUserTokenCacheList.AsNoTracking().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.PerUserTokenCacheList.FirstOrDefault(c => c.webUserUniqueId == User);
}
else
{ // retrieve last write from the DB
var status = from e in db.PerUserTokenCacheList
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.PerUserTokenCacheList.FirstOrDefault(c => c.webUserUniqueId == User);
}
}
this.Deserialize((Cache == null) ? null : Cache.cacheBits);
}
