toClose?.closeQuietly()
    connectionUser.connectionReleased(candidate)
    connectionUser.connectionConnectionReleased(candidate)
    if (toClose != null) {
      connectionUser.connectionConnectionClosed(candidate)
    } else if (noNewExchangesEvent) {
      connectionUser.noNewExchanges(candidate)
    }
    return null
  }

  /** Plans to make a new connection by deciding which route to try next. */