XMPP协议学习笔记四(Openfire服务器启动过程) - nomousewch的专栏 - 博客频道 - CSDN.NETjava
在上篇文章中咱们成功部署了openfire的源码,这一篇咱们来初步了解一下openfire的项目结构。web
- 概述
Openfire最主要的功能是实现XMPP服务器,简单来讲,openfire为咱们提供一个固定的地址,咱们只须要向openfire服务器发送标准的XMPP信息(即XML文件流),那么openfire服务器应当给予咱们回应,这里的openfire服务器也能够看作一个容器,咱们在聊天时,须要在这个服务器上注册一个会话,在会话存在的时间,咱们能够实现即时聊天的一些经常使用功能,好比创建本身的组,添加好友,聊天,以及传送文件等等,同时,openfire服务器也须要实现本身的管理界面,这样openfire服务器也扮演一个web容器的角色。数据库
XMPP协议是基于TCP/IP协议进行传输的,在openfire中,应用了apache的mina框架做为NIO框架,简单的来讲,openfire服务器用mina框架创建一个简单的服务器,能够接收和发送基本的IO流,而后在此基础上把接收到的IO流解析为XML文件,而后在根据XMPP协议对XML文件进行操做。apache
- Openfire启动过程
系统启动时调用org.jivesoftware.openfire.starter.ServerStarter类中的start()方法,加载org.jivesoftware.openfire.XMPPServer类,并调用这个类的start()方法进行一系列的初始化操做,下面是XMPPServer的Start()方法服务器
- public void start() {
- try {
- initialize();
- startDate = new Date();
- // Store server info
- xmppServerInfo = new XMPPServerInfoImpl(name, host, version, startDate, getConnectionManager());
- // Create PluginManager now (but don't start it) so that modules may use it
- File pluginDir = new File(openfireHome, "plugins");
- pluginManager = new PluginManager(pluginDir);
- // If the server has already been setup then we can start all the server's modules
- if (!setupMode) {
- //这个方法是验证数据库链接是否正确
- verifyDataSource();
- //加载全部模块
- // First load all the modules so that modules may access other modules while
- // being initialized
- loadModules();
- // Initize all the modules
- initModules();
- // Start all the modules
- startModules();
- }
- // Initialize statistics
- ServerTrafficCounter.initStatistics();
- // Load plugins (when in setup mode only the admin console will be loaded)
- pluginManager.start();
- // Log that the server has been started
- String startupBanner = LocaleUtils.getLocalizedString("short.title") + " " + version.getVersionString() +
- " [" + JiveGlobals.formatDateTime(new Date()) + "]";
- Log.info(startupBanner);
- System.out.println(startupBanner);
- started = true;
- // Notify server listeners that the server has been started
- for (XMPPServerListener listener : listeners) {
- listener.serverStarted();
- }
- }
- catch (Exception e) {
- e.printStackTrace();
- Log.error(e.getMessage(), e);
- System.out.println(LocaleUtils.getLocalizedString("startup.error"));
- shutdownServer();
- }
- }
public void start() { try { initialize(); startDate = new Date(); // Store server info xmppServerInfo = new XMPPServerInfoImpl(name, host, version, startDate, getConnectionManager()); // Create PluginManager now (but don't start it) so that modules may use it File pluginDir = new File(openfireHome, "plugins"); pluginManager = new PluginManager(pluginDir); // If the server has already been setup then we can start all the server's modules if (!setupMode) { //这个方法是验证数据库链接是否正确 verifyDataSource(); //加载全部模块 // First load all the modules so that modules may access other modules while // being initialized loadModules(); // Initize all the modules initModules(); // Start all the modules startModules(); } // Initialize statistics ServerTrafficCounter.initStatistics(); // Load plugins (when in setup mode only the admin console will be loaded) pluginManager.start(); // Log that the server has been started String startupBanner = LocaleUtils.getLocalizedString("short.title") + " " + version.getVersionString() + " [" + JiveGlobals.formatDateTime(new Date()) + "]"; Log.info(startupBanner); System.out.println(startupBanner); started = true; // Notify server listeners that the server has been started for (XMPPServerListener listener : listeners) { listener.serverStarted(); } } catch (Exception e) { e.printStackTrace(); Log.error(e.getMessage(), e); System.out.println(LocaleUtils.getLocalizedString("startup.error")); shutdownServer(); } }我的以为,openfire服务器的启动过程至关清晰,全部的模块都实现了Module接口,而后在启动时统一调用全部模块的initial()方法和start()方法,简单明了又便于扩展,在从此本身的项目中值得加以运用。app