import com.google.common.base.Optional;
import org.opendaylight.controller.config.persist.api.Persister;
import org.opendaylight.controller.config.persist.api.storage.StorageAdapter;
import com.google.common.base.Optional;
import org.opendaylight.controller.config.persist.api.Persister;
import org.opendaylight.controller.config.persist.api.storage.StorageAdapter;