Tomcat源码---初始化容器五

一,上面文章完成了对server.xml载入以及解析,现在主要做的是就是对里面所定义的容器进行初始化工作.

查看org.apache.catalina.startup.Catalina#load()

 

     //StandarServer开始进行实例化
               server.initialize();

 

默认情况下是org.apache.catalina.core.StandardServer#initialize的初始化....

 

 public void initialize()
        throws LifecycleException 
    {
        if (initialized) {
                log.info(sm.getString("standardServer.initialize.initialized"));
            return;
        }
	//容器周期的通知,这里使用了Adapter,Observer模式,以下文章对其详解
        lifecycle.fireLifecycleEvent(INIT_EVENT, null);
        //已经初始化
        initialized = true;

        if( oname==null ) {
            try {
		//使用jmx进行对象管理
                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
	//按着server.xml里的流程,初始化完server完再初始化StandardService
        for (int i = 0; i < services.length; i++) {
            services[i].initialize();
        }
    }

   //org.apache.catalina.core.StandardService#initialize() 初始化

 

 
    /**
     * 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);
                
		//对线程池的初始化,在消息传递时,如果有server.xml中设置了,就覆盖默认设置
                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
        //往下一级初始化就是connector 两个 如8080 8009
        synchronized (connectors) {
                for (int i = 0; i < connectors.length; i++) {
                    connectors[i].initialize();
                }
        }
    }

  现在进入org.apache.catalina.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
        //对Adapter的初始化,并把connector设置进去
        adapter = new CoyoteAdapter(this);
        //以下对象在构造函数中已经实例化,把adapter设置进去
        protocolHandler.setAdapter(adapter);

        IntrospectionUtils.setProperty(protocolHandler, "jkHome",
                                       System.getProperty("catalina.base"));

        try {
            //继续下一步的实现
            protocolHandler.init();
        } catch (Exception e) {
            throw new LifecycleException
                (sm.getString
                 ("coyoteConnector.protocolHandlerInitializationFailed", e));
        }
    }

   org.apache.coyote.http11.Http11Protocol(implements ProtocolHandler)#init

 public void init() throws Exception {
        //JIoEndpoint在全局变量中已经实例化,以下为其设置相应的值
        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 {
            //以上if语句都没有通过执行,直接执行到JIoEndpoint
            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()));

    }

   org.apache.tomcat.util.net.JIoEndpoint#init   这个类里面对Socket进行了设置,以后每一次通信都从这个类开始

public void init()
        throws Exception {

        if (initialized)
            return;
        
        // Initialize thread count defaults for acceptor
        if (acceptorThreadCount == 0) {
            acceptorThreadCount = 1;
        }
        if (serverSocketFactory == null) {
            //serverSocketFacotry的创建(工厂模式)
            serverSocketFactory = ServerSocketFactory.getDefault();
        }
        if (serverSocket == null) {
            try {
                if (address == null) {
                    //创建serverSocket
                    serverSocket = serverSocketFactory.createSocket(port, backlog);
                } else {
                    serverSocket = serverSocketFactory.createSocket(port, backlog, address);
                }
            } catch (BindException be) {
                if (address == null)
                    throw new BindException(be.getMessage() + "<null>:" + port);
                else
                    throw new BindException(be.getMessage() + " " +
                            address.toString() + ":" + port);
            }
        }
        //if( serverTimeout >= 0 )
        //    serverSocket.setSoTimeout( serverTimeout );
        
        initialized = true;
        
    }

  到这里tomcat的初始化工作已经基本完成,接下来进行相应容器的启动处理