Amazon.Runtime.RefreshingAWSCredentials.GetCredentials C# (CSharp) Method

        public override ImmutableCredentials GetCredentials()
        {
            lock (this._refreshLock)
            {
                // If credentials are expired, update
                if (ShouldUpdate)
                {
                    _currentState = GenerateNewCredentials();

                    // Check if the new credentials are already expired
                    if (ShouldUpdate)
                    {
                        throw new AmazonClientException("The retrieved credentials have already expired");
                    }

                    // Offset the Expiration by PreemptExpiryTime
                    _currentState.Expiration -= PreemptExpiryTime;

                    if (ShouldUpdate)
                    {
                        // This could happen if the default value of PreemptExpiryTime is
                        // overriden and set too high such that ShouldUpdate returns true.
                        _logger.InfoFormat(
                            "The preempt expiry time is set too high: Current time = {0}, Credentials expiry time = {1}, Preempt expiry time = {2}.",
                            DateTime.Now,
                            _currentState.Expiration,
                            PreemptExpiryTime);
                    }
                }

                return _currentState.Credentials.Copy();
            }
        }