Java tutorial
package com.kixeye.kixmpp.server.module.session; /* * #%L * KIXMPP * %% * Copyright (C) 2014 KIXEYE, Inc * %% * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * #L% */ import com.kixeye.kixmpp.KixmppStreamStart; import io.netty.channel.Channel; import io.netty.util.AttributeKey; import java.util.LinkedList; import java.util.List; import org.jdom2.Element; import org.jdom2.Namespace; import com.kixeye.kixmpp.handler.KixmppStanzaHandler; import com.kixeye.kixmpp.server.KixmppServer; import com.kixeye.kixmpp.server.module.KixmppServerModule; /** * Handles sessions. * * @author ebahtijaragic */ public class SessionKixmppServerModule implements KixmppServerModule { public static AttributeKey<Boolean> IS_SESSION_ESTABLISHED = AttributeKey.valueOf("IS_SESSION_ESTABLISHED"); private KixmppServer server; /** * @see com.kixeye.kixmpp.server.module.KixmppModule#install(com.kixeye.kixmpp.server.KixmppServer) */ public void install(KixmppServer server) { this.server = server; this.server.getEventEngine().registerGlobalStanzaHandler("iq", SESSION_HANDLER); } /** * @see com.kixeye.kixmpp.server.module.KixmppModule#uninstall(com.kixeye.kixmpp.server.KixmppServer) */ public void uninstall(KixmppServer server) { this.server.getEventEngine().unregisterGlobalStanzaHandler("iq", SESSION_HANDLER); } /** * @see com.kixeye.kixmpp.server.module.KixmppModule#getFeatures(io.netty.channel.Channel) */ public List<Element> getFeatures(Channel channel) { List<Element> features = new LinkedList<>(); Boolean isSessionEnabled = channel.attr(IS_SESSION_ESTABLISHED).get(); if (isSessionEnabled == null || isSessionEnabled == false) { Element bind = new Element("session", null, "urn:ietf:params:xml:ns:xmpp-session"); features.add(bind); } return features; } private KixmppStanzaHandler SESSION_HANDLER = new KixmppStanzaHandler() { /** * @see com.kixeye.kixmpp.server.KixmppStanzaHandler#handle(io.netty.channel.Channel, org.jdom2.Element) */ public void handle(Channel channel, Element stanza) { Element session = stanza.getChild("session", Namespace.getNamespace("urn:ietf:params:xml:ns:xmpp-session")); if (session != null) { channel.attr(IS_SESSION_ESTABLISHED).set(true); Element iq = new Element("iq"); iq.setAttribute("type", "result"); String id = stanza.getAttributeValue("id"); if (id != null) { iq.setAttribute("id", id); } channel.writeAndFlush(iq); server.getEventEngine().publishSessionStart(channel); } } }; }