public async Task <ISet <string> > GetRolesAsync(string userId)
{
if (userId == null)
{
return(new HashSet <string>());
}
var user = await this._userManager.FindByIdAsync(userId);
if (user == null)
{
return(new HashSet <string>());
}
if (this._roles != null)
{
return(_roles);
}
var cacheKey = UserRolesFetcher.CacheKey(userId);
if (!this._cache.TryGetValue(cacheKey, out this._roles))
{
this._roles = new HashSet <string>(await this._userManager.GetRolesAsync(user));
var cacheEntryOptions = new MemoryCacheEntryOptions();
cacheEntryOptions.SetSlidingExpiration(TimeSpan.FromMinutes(5));
this._cache.Set(cacheKey, this._roles, cacheEntryOptions);
}
return(_roles);
}
public void ClearCache(string userId)
{
this._cache.Remove(UserRolesFetcher.CacheKey(userId));
}