code: public final TcpServer doOnBound(Consumer<? super DisposableServer> doOnBound) {
  		Objects.requireNonNull(doOnBound, "doOnBound");
  		return new TcpServerDoOn(this, null, doOnBound, null);
  	}
docs: Setups a callback called when {@link io.netty.channel.ServerChannel} is
  bound.
  
  @param doOnBound a consumer observing server started event
  
  @return a new {@link TcpServer}