import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
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import javax.inject.Inject;
import javax.inject.Singleton;
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import org.opendaylight.genius.mdsalutil.MDSALUtil;
import org.opendaylight.mdsal.binding.api.DataBroker;
import org.opendaylight.mdsal.common.api.LogicalDatastoreType;