Examples of rocks.xmpp.extensions.disco.ServiceDiscoveryManager.discoverItems()

                                @Override
                                public void handle(ActionEvent actionEvent) {
                                    PubSubManager pubSubManager = xmppSession.getExtensionManager(PubSubManager.class);
                                    ServiceDiscoveryManager serviceDiscoveryManager = xmppSession.getExtensionManager(ServiceDiscoveryManager.class);
                                    try {
                                        ItemNode infoNode = serviceDiscoveryManager.discoverItems(null);
                                        int i = 0;
                                    } catch (XmppException e) {
                                        e.printStackTrace();
                                    }
                                }

     * @see <a href="http://xmpp.org/extensions/xep-0013.html#request-headers">2.3 Requesting Message Headers</a>
     */
    public List<OfflineMessageHeader> requestMessageHeaders() throws XmppException {
        List<OfflineMessageHeader> result = new ArrayList<>();
        ServiceDiscoveryManager serviceDiscoveryManager = xmppSession.getExtensionManager(ServiceDiscoveryManager.class);
        ItemNode itemNode = serviceDiscoveryManager.discoverItems(null, OfflineMessage.NAMESPACE);
        for (Item item : itemNode.getItems()) {
            result.add(new OfflineMessageHeader(Jid.valueOf(item.getName()), item.getNode()));
        }
        return result;
    }

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