class SimpleChannelFutureListener implements ChannelFutureListener {

    @Override
    public final void operationComplete(ChannelFuture future) {<FILL_FUNCTION_BODY>}

    public abstract void onSuccess(Channel channel);

    public abstract void onFailure(Channel channel, Throwable cause);
}

        Channel channel = future.channel();
        if (future.isSuccess()) {
            onSuccess(channel);
        } else {
            onFailure(channel, future.cause());
        }
    
<no_super_class>