标签：tomcat   bootstrap   catalina   

Catalina

    public void process(String args[]) {

        setCatalinaHome();     //设定Home与Base的值为user.dir
        setCatalinaBase();
      
    if (arguments(args))   //省略try catch
             execute();        //检查args的格式       
    }
    protected void execute() throws Exception {
        if (starting)
            start();
        else if (stopping)
            stop();
    }

  protected void start() { //省略了大量非核心代码 及try catch
    ...
        // Create and execute our Digester
        Digester digester = createStartDigester();  //这个要是不懂看15章
        File file = configFile();                   //指定文件为conf/server.xml
            InputSource is =new InputSource("file://" + file.getAbsolutePath());
            FileInputStream fis = new FileInputStream(file);
            is.setByteStream(fis);
            digester.push(this);        //把catalina自己放了进去  
                    //catalina里有server组件
            digester.parse(is);
            fis.close();
      
    ...
        // Start the new server
        if (server instanceof Lifecycle) {
                server.initialize();
                // Wait for the server to be told to shut down
                server.await();  //上面的英文再给大家解释一下吧
                         //除非收到SHUTDOWM的指令 就一直阻塞在这里
                 //这要是不懂 回去看第二三章
        }
    ...
        // Shut down the server
        if (server instanceof Lifecycle) {
                ((Lifecycle) server).stop();
        }
    }

 protected Digester createStartDigester() {

        // Initialize the digester
        Digester digester = new Digester();
        if (debug)
            digester.setDebug(999);
        digester.setValidating(false);

        // Configure the actions we will be using
        digester.addObjectCreate("Server",
                                 "org.apache.catalina.core.StandardServer",
                                 "className");
        digester.addSetProperties("Server");
    //解释一下下面
    //在解析server.xml时 如果碰到Server这个模式
    //就调用栈底元素的方法名为setServer参数为org.apache.catalina.Server的方法
    //把Server自己(就是上面addObjectCreate产生的那个)注入栈底的那个元素
    //那么栈底是什么呢?
    //digester.push(this); 看看这行代码还有Catalian的setServer方法
        digester.addSetNext("Server",
                            "setServer",
                            "org.apache.catalina.Server");
    
    .....
    return digester
}

Bootstrap类

  public static void main(String args[]) {// 省略非核心代码及try catch
        // Construct the class loaders we will need
        ClassLoader commonLoader = null;
        ClassLoader catalinaLoader = null;
        ClassLoader sharedLoader = null;
      ...

            // Load our startup class and call its process() method
            // Instantiate a startup class instance
            if (debug >= 1)
                log("Loading startup class");
            Class startupClass =
                catalinaLoader.loadClass
                ("org.apache.catalina.startup.Catalina");
            Object startupInstance = startupClass.newInstance(); //加载Catalina类

            // Call the process() method
            if (debug >= 1)
                log("Calling startup class process() method");
            methodName = "process";
            paramTypes = new Class[1];
            paramTypes[0] = args.getClass();
            paramValues = new Object[1];
            paramValues[0] = args;
            method =
                startupInstance.getClass().getMethod(methodName, paramTypes);
            method.invoke(startupInstance, paramValues);  //调用Catalina的process方法
    }

关于startup.bat的知识,我们下一节再谈... 哎还有一节呀

How tomcat works 读书笔记十七 启动tomcat 上

标签：tomcat   bootstrap   catalina   

原文地址：http://blog.csdn.net/dlf123321/article/details/41966739