@Override
    public java.util.concurrent.Future<AssociateAliasResult> associateAliasAsync(AssociateAliasRequest request) {

        return associateAliasAsync(request, null);
    }
Abstract implementation of {@code AmazonCloudFrontAsync}. Convenient method forms pass through to the corresponding
overload that takes a request object and an {@code AsyncHandler}, which throws an
{@code UnsupportedOperationException}.
aws-java-sdk-cloudfront/src/main/java/com/amazonaws/services/cloudfront/AbstractAmazonCloudFrontAsync.java