import static java.util.Objects.requireNonNull;
import com.google.common.base.Strings;
-import com.google.common.base.Supplier;
import com.google.common.base.Suppliers;
import java.util.concurrent.TimeUnit;
+import java.util.function.Supplier;
import org.eclipse.jdt.annotation.NonNull;
import org.opendaylight.controller.cluster.raft.policy.DefaultRaftPolicy;
import org.opendaylight.controller.cluster.raft.policy.RaftPolicy;