public interface Service {
   CompletableFuture<ResponseCar> getResponseOfApple(String url, UUID id);
   CompletableFuture<ResponsePear> getResponseOfPear(String url, UUID id);
}

@RequiredArgsConstructor
public class PrioritizedQueueElement extends Observable implements Comparable<PrioritizedQueueElement> {

    @NonNull
    @Getter
    private final Object argument;

    @Getter
    @Setter
    private Object returnValue;

    @NonNull
    @Getter
    private final QueueElementType priority;


    @Override
    public int compareTo(final PrioritizedQueueElement o) {
        if (o == null || this.priority == null || o.priority == null) {
            throw new NullPointerException("wrong value");
        }

        return this.priority.compareTo(o.priority);
    }


    public <T> T getValue() {
        return (T) this.returnValue;
    }

    public void setReturnValue(final Object value) {
        this.returnValue = value;
        this.setChanged();
        this.notifyObservers();
    }
}

public enum QueueElementType {
    ONE_TIME_HIGH_PRIORITY,
    ONE_TIME_LOW_PRIORITY,
    RECURRENT_HIGH_PRIORITY,
    RECURRENT_LOW_PRIORITY
}