import akka.actor.ActorRef;
import akka.actor.Props;
-import com.google.common.base.Function;
import com.google.common.io.ByteSource;
import com.google.common.util.concurrent.Uninterruptibles;
import java.io.IOException;
import java.util.Optional;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
+import java.util.function.Function;
import org.apache.commons.lang3.SerializationUtils;
import org.opendaylight.controller.cluster.DataPersistenceProvider;
import org.opendaylight.controller.cluster.raft.behaviors.RaftActorBehavior;