public void update(Observable source, Object object) { if (source instanceof Users) { if (!this.isDisabled()) { try { Operations.sendUserNamesList(users.getUserNames(), out); } catch (IOException io) { logger.error("IO Exception", io); } } } if (source instanceof Messages) { try { Operations.sendMessage((MessageType) object, out); } catch (IOException io) { if (out != null) { try { out.close(); } catch (Exception ioe) { logger.error("Failed to close the output stream", ioe); } } logger.error("Impossible to send messages", io); } } }