> +/**
> + * The {@link ImageExtension} implementation for the DigitalOcean provider.
> + * 
> + * @author Sergi Castro
> + * @author Ignasi Barrera
> + */
> +@Singleton
> +public class DigitalOceanImageExtension implements ImageExtension {
> +
> +   @Resource
> +   @Named(ComputeServiceConstants.COMPUTE_LOGGER)
> +   protected Logger logger = Logger.NULL;
> +
> +   private final DigitalOceanApi api;
> +   private final Predicate<Integer> imageAvailablePredicate;
> +   private final Predicate<Integer> nodeStoppedPredicate;

Predicates on integers? Any reason now to use an enum here..?

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