AccessTokenRefresher LookupAccessTokenRefresher()
{
if (_tokenRefresher != null)
{
return(_tokenRefresher);
}
var resourceName = ResourceName?.Render(LogEventInfo.CreateNullEvent());
if (string.IsNullOrEmpty(resourceName))
{
InternalLogger.Warn("AccessToken LayoutRenderer - Missing ResourceName");
return(null);
}
var tenantId = TenantId?.Render(LogEventInfo.CreateNullEvent());
if (string.IsNullOrWhiteSpace(tenantId))
{
tenantId = null;
}
var connectionString = ConnectionString?.Render(LogEventInfo.CreateNullEvent());
var azureAdInstance = AzureAdInstance?.Render(LogEventInfo.CreateNullEvent());
var tokenProviderKey = new TokenProviderKey(resourceName, tenantId, connectionString, azureAdInstance);
AccessTokenRefresher tokenRefresher = null;
if (!AccessTokenProviders.TryGetValue(tokenProviderKey, out var tokenProvider) || !tokenProvider.TryGetTarget(out tokenRefresher))
{
var serviceProvider = _tokenProviderFactory(connectionString, azureAdInstance);
lock (AccessTokenProviders)
{
if (_tokenRefresher == null)
{
if (!AccessTokenProviders.TryGetValue(tokenProviderKey, out tokenProvider) || !tokenProvider.TryGetTarget(out tokenRefresher))
{
tokenRefresher = new AccessTokenRefresher(serviceProvider, resourceName, tenantId);
AccessTokenProviders[tokenProviderKey] = new WeakReference <AccessTokenRefresher>(tokenRefresher);
}
}
}
}
if (Interlocked.CompareExchange(ref _tokenRefresher, tokenRefresher, null) == null)
{
_tokenRefresher.AccessTokenRefreshed += AccessTokenRefreshed;
}
return(_tokenRefresher);
}
