private async Task EnsureAccessToken()
{
if (DateTimeOffset.Now > _tokenWrapper.Expiry.GetValueOrDefault())
{
await _accessTokenSemaphore.WaitAsync();
try
{
if (DateTimeOffset.Now > _tokenWrapper.Expiry.GetValueOrDefault())
{
_tokenWrapper = await _authProvider.GetAccessTokenAsync(GraphLiteConfiguration.AzureADGraphApiRoot);
}
}
finally
{
_accessTokenSemaphore.Release();
}
}
}