import akka.actor.ActorRef;
import java.util.concurrent.CompletionStage;
import java.util.function.Consumer;
import akka.actor.ActorRef;
import java.util.concurrent.CompletionStage;
import java.util.function.Consumer;
* @param cookie Backend cookie
* @return A {@link CompletionStage} resulting in information about the backend
*/
* @param cookie Backend cookie
* @return A {@link CompletionStage} resulting in information about the backend
*/
* @param staleInfo Stale backend information
* @return A {@link CompletionStage} resulting in information about the backend
*/
* @param staleInfo Stale backend information
* @return A {@link CompletionStage} resulting in information about the backend
*/