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[经验分享] Tomcat源码---容器启动六(1)

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发表于 2017-2-1 14:20:40 | 显示全部楼层 |阅读模式
  一,完成了以上的初始化工作,现在进行容器的启动工作由
  -------------------------------------------------------------------------------------
  c) Catalina.start()
  c1) Starts the NamingContext and binds all JNDI references into it
  c2) Starts the services under <Server> which are:
  StandardService -> starts Engine (ContainerBase ->Logger,Loader,Realm,Cluster etc)
  c3) StandardHost (started by the service)
  Configures a ErrorReportValvem to do proper HTML output for different HTTP 
  errors codes
  Starts the Valves in the pipeline (at least the ErrorReportValve)
  Configures the StandardHostValve, 
  this valves ties the Webapp Class loader to the thread context
  it also finds the session for the request
  and invokes the context pipeline
  Starts the HostConfig component
  This component deploys all the webapps
  (webapps & conf/Catalina/localhost/*.xml)
  Webapps are installed using the deployer (StandardHostDeployer)
  The deployer will create a Digester for your context, this digester
  will then invoke ContextConfig.start()
  The ContextConfig.start() will process the default web.xml (conf/web.xml)
  and then process the applications web.xml (WEB-INF/web.xml)
  
  c4) During the lifetime of the container (StandardEngine) there is a background thread that 
      keeps checking if the context has changed. If a context changes (timestamp of war file, 
      context xml file, web.xml) then a reload is issued (stop/remove/deploy/start)



  -------------------------------------------------------------------------------------
  org.apache.catalina.startup.Bootstrap#main

else if (command.equals("start")) {
daemon.setAwait(true);
daemon.load(args);
//开始启动  
daemon.start();
}
  
     /**

     * Start the Catalina daemon.
*/
public void start()
throws Exception {
if( catalinaDaemon==null ) init();
//开始调用Catalina类里面的start方法
Method method = catalinaDaemon.getClass().getMethod("start", (Class [] )null);
method.invoke(catalinaDaemon, (Object [])null);
}
  ..Catalina#start

   /**
* Start a new server instance.
*/
public void start() {
if (server == null) {
load();
}
long t1 = System.nanoTime();
// Start the new server
//进入server的启动工作
if (server instanceof Lifecycle) {
try {
((Lifecycle) server).start();
} catch (LifecycleException e) {
log.error("Catalina.start: ", e);
}
}
long t2 = System.nanoTime();
if(log.isInfoEnabled())
log.info("Server startup in " + ((t2 - t1) / 1000000) + " ms");
try {
// Register shutdown hook
if (useShutdownHook) {
if (shutdownHook == null) {
shutdownHook = new CatalinaShutdownHook();
}
Runtime.getRuntime().addShutdownHook(shutdownHook);
}
} catch (Throwable t) {
// This will fail on JDK 1.2. Ignoring, as Tomcat can run
// fine without the shutdown hook.
}
if (await) {
await();
stop();
}
}

  ->StandardServer#start

public void start() throws LifecycleException {
// Validate and update our current component state
if (started) {
log.debug(sm.getString("standardServer.start.started"));
return;
}
// Notify our interested LifecycleListeners
//启动之前
lifecycle.fireLifecycleEvent(BEFORE_START_EVENT, null);
//启动中
lifecycle.fireLifecycleEvent(START_EVENT, null);
started = true;
// Start our defined Services
//进入service的启动
synchronized (services) {
for (int i = 0; i < services.length; i++) {
if (services instanceof Lifecycle)
((Lifecycle) services).start();
}
}
// Notify our interested LifecycleListeners
//启动后
lifecycle.fireLifecycleEvent(AFTER_START_EVENT, null);
}
  StandardService#start

public void start() throws LifecycleException {
// Validate and update our current component state
if (log.isInfoEnabled() && started) {
log.info(sm.getString("standardService.start.started"));
}
if( ! initialized )
init();
// Notify our interested LifecycleListeners
lifecycle.fireLifecycleEvent(BEFORE_START_EVENT, null);
if(log.isInfoEnabled())
log.info(sm.getString("standardService.start.name", this.name));
lifecycle.fireLifecycleEvent(START_EVENT, null);
started = true;
// Start our defined Container first
//进入standardEngine的启动
if (container != null) {
synchronized (container) {
if (container instanceof Lifecycle) {
((Lifecycle) container).start();
}
}
}
//线程池的启动
synchronized (executors) {
for ( int i=0; i<executors.size(); i++ ) {
executors.get(i).start();
}
}
// Start our defined Connectors second
//两个connector的启动8080 8009
synchronized (connectors) {
for (int i = 0; i < connectors.length; i++) {
if (connectors instanceof Lifecycle)
((Lifecycle) connectors).start();
}
}
// Notify our interested LifecycleListeners
lifecycle.fireLifecycleEvent(AFTER_START_EVENT, null);
}

  ->StandardEngine#start

public void start() throws LifecycleException {
if( started ) {
return;
}
if( !initialized ) {
//进行一些加入jmx管理等
init();
}
// Look for a realm - that may have been configured earlier.
// If the realm is added after context - it'll set itself.
//表示存放用户名,密码及role的数据库
if( realm == null ) {
ObjectName realmName=null;
try {
realmName=new ObjectName( domain + ":type=Realm");
if( mserver.isRegistered(realmName ) ) {
mserver.invoke(realmName, "init",
new Object[] {},
new String[] {}
);            
}
} catch( Throwable t ) {
log.debug("No realm for this engine " + realmName);
}
}
// Log our server identification information
//System.out.println(ServerInfo.getServerInfo());
if(log.isInfoEnabled())
log.info( "Starting Servlet Engine: " + ServerInfo.getServerInfo());
if( mbeans != null ) {
try {
Registry.getRegistry(null, null)
.invoke(mbeans, "start", false);
} catch (Exception e) {
log.error("Error in start() for " + mbeansFile, e);
}
}
// Standard container startup
//进行logger,manager,cluster,realm,resource的启动
super.start();
}

  super.start()--->org.apache.catalina.core.ContainerBase#start()
  进行其他一些组件的启动工作,,,看下一章节....

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所有资源均系网友上传或者通过网络收集,我们仅提供一个展示、介绍、观摩学习的平台,我们不对其承担任何法律责任,如涉及侵犯版权等问题,请您及时通知我们,我们将立即处理,联系人Email:kefu@iyunv.com,QQ:1061981298 本贴地址:https://www.yunweiku.com/thread-336206-1-1.html 上篇帖子: Tomcat中Context是什么用的 下篇帖子: Tomcat源码---请求处理四(1)
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