content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License.  You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package org.apache.commons.net;
  import java.util.EventListener;
  
  /***
   * There exists a large class of IETF protocols that work by sending an
   * ASCII text command and arguments to a server, and then receiving an
   * ASCII text reply.  For debugging and other purposes, it is extremely
   * useful to log or keep track of the contents of the protocol messages.
   * The ProtocolCommandListener interface coupled with the
   * {@link ProtocolCommandEvent} class facilitate this process.
   * <p>
   * To receive ProtocolCommandEvents, you merely implement the
   * ProtocolCommandListener interface and register the class as a listener
   * with a ProtocolCommandEvent source such as
   * {@link org.apache.commons.net.ftp.FTPClient}.
   *
   *
   * @see ProtocolCommandEvent
   * @see ProtocolCommandSupport
   ***/
  
  public interface ProtocolCommandListener extends EventListener
  {
  
      /***
       * This method is invoked by a ProtocolCommandEvent source after
       * sending a protocol command to a server.
       *
       * @param event The ProtocolCommandEvent fired.
       ***/
      public void protocolCommandSent(ProtocolCommandEvent event);
  
      /***
       * This method is invoked by a ProtocolCommandEvent source after
       * receiving a reply from a server.
       *
       * @param event The ProtocolCommandEvent fired.
       ***/
      public void protocolReplyReceived(ProtocolCommandEvent event);
  
  }
  