[Tomcat6.0源码]组件的初始化

1.Bootstrap.main()做的几件事：

1）daemon.init();创建Catalina对象

2）daemon.load(args);调用Catalina.load();通过解析server.xml对相关组件的实例化和初始化

3）daemon.start();调用Catalina.start()依次启动各组件

前面已经了解Catalina.load()用Digester实例化各组件的过程。接着看看各组件的初始化：

        if (getServer() instanceof Lifecycle) {            try {                getServer().initialize();            } catch (LifecycleException e) {                if (Boolean.getBoolean("org.apache.catalina.startup.EXIT_ON_INIT_FAILURE"))                    throw new java.lang.Error(e);                else                       log.error("Catalina.start", e);                            }        }

2.getServer().initialize();调用StandardServer.initialize():

    /**     * Invoke a pre-startup initialization. This is used to allow connectors     * to bind to restricted ports under Unix operating environments.     */    public void initialize()        throws LifecycleException     {        if (initialized) {                log.info(sm.getString("standardServer.initialize.initialized"));            return;        }        lifecycle.fireLifecycleEvent(INIT_EVENT, null);        initialized = true;        if( oname==null ) {            try {                oname=new ObjectName( "Catalina:type=Server");                Registry.getRegistry(null, null)                    .registerComponent(this, oname, null );            } catch (Exception e) {                log.error("Error registering ",e);            }        }                // Register global String cache        try {            ObjectName oname2 =                 new ObjectName(oname.getDomain() + ":type=StringCache");            Registry.getRegistry(null, null)                .registerComponent(new StringCache(), oname2, null );        } catch (Exception e) {            log.error("Error registering ",e);        }        // Initialize our defined Services        for (int i = 0; i < services.length; i++) {            services[i].initialize();        }    }

3.循环执行services[i].initialize();即调用与其相关的所有StandardService.initialize()：

    /**     * Invoke a pre-startup initialization. This is used to allow connectors     * to bind to restricted ports under Unix operating environments.     */    public void initialize()            throws LifecycleException    {        // Service shouldn't be used with embeded, so it doesn't matter        if (initialized) {            if(log.isInfoEnabled())                log.info(sm.getString("standardService.initialize.initialized"));            return;        }        initialized = true;        if( oname==null ) {            try {                // Hack - Server should be deprecated...                Container engine=this.getContainer();                domain=engine.getName();                oname=new ObjectName(domain + ":type=Service,serviceName="+name);                this.controller=oname;                Registry.getRegistry(null, null)                    .registerComponent(this, oname, null);                                Executor[] executors = findExecutors();                for (int i = 0; i < executors.length; i++) {                    ObjectName executorObjectName =                         new ObjectName(domain + ":type=Executor,name=" + executors[i].getName());                    Registry.getRegistry(null, null)                        .registerComponent(executors[i], executorObjectName, null);                }                            } catch (Exception e) {                log.error(sm.getString("standardService.register.failed",domain),e);            }                                }        if( server==null ) {            // Register with the server             // HACK: ServerFactory should be removed...                        ServerFactory.getServer().addService(this);        }                       // Initialize our defined Connectors        synchronized (connectors) {            for (int i = 0; i < connectors.length; i++) {                try {                    connectors[i].initialize();                } catch (Exception e) {                    String message = sm.getString(                            "standardService.connector.initFailed",                            connectors[i]);                    log.error(message, e);                    if (Boolean.getBoolean("org.apache.catalina.startup.EXIT_ON_INIT_FAILURE"))                        throw new LifecycleException(message);                }            }        }    }

4.循环执行connectors[i].initialize();即调用与其相关的所有Connector.initialize()：

    /**     * Initialize this connector (create ServerSocket here!)     */    public void initialize()        throws LifecycleException    {        if (initialized) {            if(log.isInfoEnabled())                log.info(sm.getString("coyoteConnector.alreadyInitialized"));           return;        }        this.initialized = true;        if( oname == null && (container instanceof StandardEngine)) {            try {                // we are loaded directly, via API - and no name was given to us                StandardEngine cb=(StandardEngine)container;                oname = createObjectName(cb.getName(), "Connector");                Registry.getRegistry(null, null)                    .registerComponent(this, oname, null);                controller=oname;            } catch (Exception e) {                log.error( "Error registering connector ", e);            }            if(log.isDebugEnabled())                log.debug("Creating name for connector " + oname);        }        // Initializa adapter        adapter = new CoyoteAdapter(this);        protocolHandler.setAdapter(adapter);        IntrospectionUtils.setProperty(protocolHandler, "jkHome",                                       System.getProperty("catalina.base"));        try {            protocolHandler.init();        } catch (Exception e) {            throw new LifecycleException                (sm.getString                 ("coyoteConnector.protocolHandlerInitializationFailed", e));        }    }

5.protocolHandler.init();调用Http11Protocol.init();

    public void init() throws Exception {        endpoint.setName(getName());        endpoint.setHandler(cHandler);        // Verify the validity of the configured socket factory        try {            if (isSSLEnabled()) {                sslImplementation =                    SSLImplementation.getInstance(sslImplementationName);                socketFactory = sslImplementation.getServerSocketFactory();                endpoint.setServerSocketFactory(socketFactory);            } else if (socketFactoryName != null) {                socketFactory = (ServerSocketFactory) Class.forName(socketFactoryName).newInstance();                endpoint.setServerSocketFactory(socketFactory);            }        } catch (Exception ex) {            log.error(sm.getString("http11protocol.socketfactory.initerror"),                      ex);            throw ex;        }        if (socketFactory!=null) {            Iterator<String> attE = attributes.keySet().iterator();            while( attE.hasNext() ) {                String key = attE.next();                Object v=attributes.get(key);                socketFactory.setAttribute(key, v);            }        }                try {            endpoint.init();        } catch (Exception ex) {            log.error(sm.getString("http11protocol.endpoint.initerror"), ex);            throw ex;        }        if (log.isInfoEnabled())            log.info(sm.getString("http11protocol.init", getName()));    }

6.endpoint.init();（endpoint对象是在Http11Protocol的属性中直接new出来的和之前用Digester解析配置不一样）。调用JIoEndpoint.init()：

    public void init()        throws Exception {        if (initialized)            return;                // Initialize thread count defaults for acceptor        if (acceptorThreadCount == 0) {            acceptorThreadCount = 1;        }        if (serverSocketFactory == null) {            serverSocketFactory = ServerSocketFactory.getDefault();        }        if (serverSocket == null) {            try {                if (address == null) {                    serverSocket = serverSocketFactory.createSocket(port, backlog);                } else {                    serverSocket = serverSocketFactory.createSocket(port, backlog, address);                }            } catch (BindException orig) {                String msg;                if (address == null)                    msg = orig.getMessage() + " <null>:" + port;                else                    msg = orig.getMessage() + " " +                            address.toString() + ":" + port;                BindException be = new BindException(msg);                be.initCause(orig);                throw be;            }        }        //if( serverTimeout >= 0 )        //    serverSocket.setSoTimeout( serverTimeout );                initialized = true;            }

7.serverSocketFactory.createSocket()创建ServerSocket占用地址、端口开始监听请求。

初始化过程其实是初始化Connector这边的组件。StandardEngine的并没有初始化。