import com.google.common.base.Preconditions;
import java.util.Collection;
import org.opendaylight.controller.cluster.datastore.messages.DataTreeChanged;
import com.google.common.base.Preconditions;
import java.util.Collection;
import org.opendaylight.controller.cluster.datastore.messages.DataTreeChanged;
import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;