import static org.opendaylight.controller.cluster.access.client.ConnectionEntryMatcher.entryWithRequest;
import akka.actor.ActorSystem;
import static org.opendaylight.controller.cluster.access.client.ConnectionEntryMatcher.entryWithRequest;
import akka.actor.ActorSystem;
import com.google.common.base.Ticker;
import java.util.Collection;
import java.util.Optional;
import com.google.common.base.Ticker;
import java.util.Collection;
import java.util.Optional;