docs: @PreDestroy
  	public void close() {
  		closed = true;
  		log.info("Closing all sessions");
  		for (String sessionId : sessions.keySet()) {
  			try {
  				closeSession(sessionId, EndReason.openviduServerStopped);
  			} catch (Exception e) {
  				log.warn("Error closing session '{}'", sessionId, e);
  			}
  		}
  	}