code: public <T> Link<T> get(final SocketAddress remoteAddr) {
      final LinkReference linkRef = this.addrToLinkRefMap.get(remoteAddr);
      return linkRef != null ? (Link<T>) linkRef.getLink() : null;
    }
docs: Returns a link for the remote address if already cached; otherwise, returns null.
  
  @param remoteAddr the remote address
  @return a link if already cached; otherwise, null