*/
package org.opendaylight.mdsal.dom.broker;
-import com.google.common.base.Optional;
import com.google.common.base.Preconditions;
import com.google.common.util.concurrent.CheckedFuture;
import com.google.common.util.concurrent.Futures;
import java.util.List;
import java.util.Map;
+import java.util.Optional;
import org.opendaylight.mdsal.dom.api.DOMRpcException;
import org.opendaylight.mdsal.dom.api.DOMRpcIdentifier;
import org.opendaylight.mdsal.dom.api.DOMRpcImplementation;