org.eclipse.jetty.io

## Interface NetworkTrafficListener

- All Known Implementing Classes:
    NetworkTrafficListener.Empty

      public interface NetworkTrafficListener

  A listener for raw network traffic within Jetty.

  `NetworkTrafficListener`s can be installed in a `org.eclipse.jetty.server.nio.NetworkTrafficSelectChannelConnector`, and are notified of the following network traffic events:

  - Connection opened, when the server has accepted the connection from a remote client
  - Incoming bytes, when the server receives bytes sent from a remote client
  - Outgoing bytes, when the server sends bytes to a remote client
  - Connection closed, when the server has closed the connection to a remote client

  `NetworkTrafficListener`s can be used to log the network traffic viewed by a Jetty server (for example logging to filesystem) for activities such as debugging or request/response cycles or for replaying request/response cycles to other servers.

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Interface and Description
    --- | ---
    `static class` | `NetworkTrafficListener.Empty` A commodity class that implements `NetworkTrafficListener` with empty methods.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `closed(Socket socket)` Callback method invoked when a connection to a remote client has been closed.
    `void` | `incoming(Socket socket, Buffer bytes)` Callback method invoked when bytes sent by a remote client arrived on the server.
    `void` | `opened(Socket socket)` Callback method invoked when a connection from a remote client has been accepted.
    `void` | `outgoing(Socket socket, Buffer bytes)` Callback method invoked when bytes are sent to a remote client from the server.

- - ### Method Detail

    - #### opened

          void opened(Socket socket)

      Callback method invoked when a connection from a remote client has been accepted.

      The `socket` parameter can be used to extract socket address information of the remote client.

      Parameters:
        `socket` - the socket associated with the remote client

    - #### incoming

          void incoming(Socket socket,
                      Buffer bytes)

      Callback method invoked when bytes sent by a remote client arrived on the server.

      Parameters:
        `socket` - the socket associated with the remote client
        `bytes` - the read-only buffer containing the incoming bytes

    - #### outgoing

          void outgoing(Socket socket,
                      Buffer bytes)

      Callback method invoked when bytes are sent to a remote client from the server.

      This method is invoked after the bytes have been actually written to the remote client.

      Parameters:
        `socket` - the socket associated with the remote client
        `bytes` - the read-only buffer containing the outgoing bytes

    - #### closed

          void closed(Socket socket)

      Callback method invoked when a connection to a remote client has been closed.

      The `socket` parameter is already closed when this method is called, so it cannot be queried for socket address information of the remote client.
      However, the `socket` parameter is the same object passed to `opened(Socket)`, so it is possible to map socket information in `opened(Socket)` and retrieve it in this method.

      Parameters:
        `socket` - the (closed) socket associated with the remote client

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