org.apache.commons.net

## Interface ProtocolCommandListener

- All Superinterfaces:
    EventListener
  All Known Implementing Classes:
    PrintCommandListener

      public interface ProtocolCommandListener
      extends 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 `ProtocolCommandEvent` class facilitate this process.

  To receive ProtocolCommandEvents, you merely implement the ProtocolCommandListener interface and register the class as a listener with a ProtocolCommandEvent source such as `FTPClient`.

  See Also:
    `ProtocolCommandEvent`, `ProtocolCommandSupport`

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `protocolCommandSent(ProtocolCommandEvent event)` This method is invoked by a ProtocolCommandEvent source after sending a protocol command to a server.
    `void` | `protocolReplyReceived(ProtocolCommandEvent event)` This method is invoked by a ProtocolCommandEvent source after receiving a reply from a server.

- - ### Method Detail

    - #### protocolCommandSent

          void protocolCommandSent(ProtocolCommandEvent event)

      This method is invoked by a ProtocolCommandEvent source after sending a protocol command to a server.
      Parameters:
        `event` - The ProtocolCommandEvent fired.

    - #### protocolReplyReceived

          void protocolReplyReceived(ProtocolCommandEvent event)

      This method is invoked by a ProtocolCommandEvent source after receiving a reply from a server.
      Parameters:
        `event` - The ProtocolCommandEvent fired.