public void setRefreshThreshold(int refreshThreshold) {
        this.refreshThreshold = refreshThreshold;
    }
Set the refresh threshold for the session credentials created by this client in
seconds. This value will be used internally to determine if new
credentials should be fetched from STS.

@see com.amazonaws.services.securitytoken.model.AssumeRoleWithWebIdentityRequest 

@param refreshThreshold 
             The new refresh threshold for session credentials created by this
             provider
aws-java-sdk-sts/src/main/java/com/amazonaws/auth/WebIdentityFederationSessionCredentialsProvider.java