code: public void choke() {
      if (!this.choking) {
        logger.trace("Choking {}", this);
        this.send(PeerMessage.ChokeMessage.craft());
        this.choking = true;
      }
    }
docs: Choke this peer.
  <p/>
  <p>
  We don't want to upload to this peer anymore, so mark that we're choking
  from this peer.
  </p>