/// <summary>
/// Reads the cache data from the backend database.
/// </summary>
private void ReadCacheForSignedInUser(ITokenCacheSerializer tokenCache)
{
if (_inMemoryCache == null) // first time access
{
_inMemoryCache = GetLatestUserRecordQuery().FirstOrDefault();
}
else
{
// retrieve last written record from the DB
var lastwriteInDb = GetLatestUserRecordQuery().Select(n => n.LastWrite).FirstOrDefault();
// if the persisted copy is newer than the in-memory copy
if (lastwriteInDb > _inMemoryCache.LastWrite)
{
// read from from storage, update in-memory copy
_inMemoryCache = GetLatestUserRecordQuery().FirstOrDefault();
}
}
// Send data to the TokenCache instance
tokenCache.DeserializeMsalV3((_inMemoryCache == null) ? null : _dataProtector.Unprotect(_inMemoryCache.CacheBits));
}