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jNDN is a new implementation of a Named Data Networking client library written in Java. It is wire format compatible with the new NDN-TLV encoding, with NDNx and PARC's CCNx.

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/**
 * Copyright (C) 2016-2017 Regents of the University of California.
 * @author: Jeff Thompson 
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see .
 * A copy of the GNU Lesser General Public License is in the file COPYING.
 */

package net.named_data.jndn;

/**
 * A class implements OnNetworkNack if it has onNetworkNack, used to pass a
 * callback to Face.expressInterest.
 */
public interface OnNetworkNack {
  /**
   * When a network Nack packet is received, onNetworkNack is called.
   * @param interest The interest given to Face.expressInterest. NOTE: You must
   * not change the interest object - if you need to change it then make a copy.
   * @param networkNack The received NetworkNack object.
   */
  void onNetworkNack(Interest interest, NetworkNack networkNack);
}