> +/**
> + * 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;
In the DigitalOcean API, the calls that take some time to complete return just
an `int` which is the identifier of the event to track. Those predicates take
care of tracking those events until completed.
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