Nicksxs's Blog

// Process the request in the adapter
if (getErrorState().isIoAllowed()) {
    try {
        rp.setStage(org.apache.coyote.Constants.STAGE_SERVICE);
        getAdapter().service(request, response);

try {
    // Parse and set Catalina and configuration specific
    // request parameters
    postParseSuccess = postParseRequest(req, request, res, response);
    if (postParseSuccess) {
        //check valves if we support async
        request.setAsyncSupported(
                connector.getService().getContainer().getPipeline().isAsyncSupported());
        // Calling the container
        // ----------> 到这就是调用 pipeline 去处理了，我们要关注上面的 postParseRequest
        connector.getService().getContainer().getPipeline().getFirst().invoke(
                request, response);
    }

while (mapRequired) {
    // This will map the the latest version by default
    connector.getService().getMapper().map(serverName, decodedURI,
            version, request.getMappingData());

    // If there is no context at this point, either this is a 404
    // because no ROOT context has been deployed or the URI was invalid
    // so no context could be mapped.
    if (request.getContext() == null) {
        // Allow processing to continue.

// Virtual host mapping
        MappedHost[] hosts = this.hosts;
        MappedHost mappedHost = exactFindIgnoreCase(hosts, host);

if (contextVersion == null) {
            // Return the latest version
            // The versions array is known to contain at least one element
            contextVersion = contextVersions[versionCount - 1];
        }
        mappingData.context = contextVersion.object;

// Wrapper mapping
if (!contextVersion.isPaused()) {
    internalMapWrapper(contextVersion, uri, mappingData);
}

// Rule 7 -- Default servlet
if (mappingData.wrapper == null && !checkJspWelcomeFiles) {
    if (contextVersion.defaultWrapper != null) {
        mappingData.wrapper = contextVersion.defaultWrapper.object;
        mappingData.requestPath.setChars
            (path.getBuffer(), path.getStart(), path.getLength());
        mappingData.wrapperPath.setChars
            (path.getBuffer(), path.getStart(), path.getLength());
        mappingData.matchType = MappingMatch.DEFAULT;

@Override
public void startInternal() throws LifecycleException {

    setState(LifecycleState.STARTING);

    Engine engine = service.getContainer();
    if (engine == null) {
        return;
    }

    findDefaultHost();

    addListeners(engine);

    Container[] conHosts = engine.findChildren();
    for (Container conHost : conHosts) {
        Host host = (Host) conHost;
        if (!LifecycleState.NEW.equals(host.getState())) {
            // Registering the host will register the context and wrappers
            registerHost(host);
        }
    }
}

private void registerHost(Host host) {

    String[] aliases = host.findAliases();
    mapper.addHost(host.getName(), aliases, host);

    for (Container container : host.findChildren()) {
        if (container.getState().isAvailable()) {
            registerContext((Context) container);
        }
    }

    // Default host may have changed
    findDefaultHost();

    if(log.isDebugEnabled()) {
        log.debug(sm.getString("mapperListener.registerHost",
                host.getName(), domain, service));
    }
}

private void registerContext(Context context) {

    String contextPath = context.getPath();
    if ("/".equals(contextPath)) {
        contextPath = "";
    }
    Host host = (Host)context.getParent();

    WebResourceRoot resources = context.getResources();
    String[] welcomeFiles = context.findWelcomeFiles();
    List<WrapperMappingInfo> wrappers = new ArrayList<>();

    for (Container container : context.findChildren()) {
        prepareWrapperMappingInfo(context, (Wrapper) container, wrappers);

        if(log.isDebugEnabled()) {
            log.debug(sm.getString("mapperListener.registerWrapper",
                    container.getName(), contextPath, service));
        }
    }

    mapper.addContextVersion(host.getName(), host, contextPath,
            context.getWebappVersion(), context, welcomeFiles, resources,
            wrappers);

    if(log.isDebugEnabled()) {
        log.debug(sm.getString("mapperListener.registerContext",
                contextPath, service));
    }
}

public void addContextVersion(String hostName, Host host, String path,
        String version, Context context, String[] welcomeResources,
        WebResourceRoot resources, Collection<WrapperMappingInfo> wrappers) {

    hostName = renameWildcardHost(hostName);

    MappedHost mappedHost  = exactFind(hosts, hostName);
    if (mappedHost == null) {
        addHost(hostName, new String[0], host);
        mappedHost = exactFind(hosts, hostName);
        if (mappedHost == null) {
            log.error(sm.getString("mapper.addContext.noHost", hostName));
            return;
        }
    }
    if (mappedHost.isAlias()) {
        log.error(sm.getString("mapper.addContext.hostIsAlias", hostName));
        return;
    }
    int slashCount = slashCount(path);
    synchronized (mappedHost) {
        ContextVersion newContextVersion = new ContextVersion(version,
                path, slashCount, context, resources, welcomeResources);
        if (wrappers != null) {
            addWrappers(newContextVersion, wrappers);
        }

public static final String ADD_CHILD_EVENT = "addChild";


/**
 * The ContainerEvent event type sent when a valve is added
 * by <code>addValve()</code>, if this Container supports pipelines.
 */
public static final String ADD_VALVE_EVENT = "addValve";


/**
 * The ContainerEvent event type sent when a child container is removed
 * by <code>removeChild()</code>.
 */
public static final String REMOVE_CHILD_EVENT = "removeChild";


/**
 * The ContainerEvent event type sent when a valve is removed
 * by <code>removeValve()</code>, if this Container supports pipelines.
 */
public static final String REMOVE_VALVE_EVENT = "removeValve";

public Pipeline getPipeline();

public Container getParent();

public void addChild(Container child);

public Container[] findChildren();

public int getStartStopThreads();

public void setStartStopThreads(int startStopThreads);

@Override
protected void initInternal() throws LifecycleException {
    reconfigureStartStopExecutor(getStartStopThreads());
    super.initInternal();
}


private void reconfigureStartStopExecutor(int threads) {
    if (threads == 1) {
        // Use a fake executor
        if (!(startStopExecutor instanceof InlineExecutorService)) {
            startStopExecutor = new InlineExecutorService();
        }
    } else {
        // Delegate utility execution to the Service
        Server server = Container.getService(this).getServer();
        server.setUtilityThreads(threads);
        startStopExecutor = server.getUtilityExecutor();
    }
}

@Override
    protected synchronized void startInternal() throws LifecycleException {

        // Start our subordinate components, if any
        logger = null;
        getLogger();
        Cluster cluster = getClusterInternal();
        if (cluster instanceof Lifecycle) {
            ((Lifecycle) cluster).start();
        }
        Realm realm = getRealmInternal();
        if (realm instanceof Lifecycle) {
            ((Lifecycle) realm).start();
        }

        // Start our child containers, if any
        Container children[] = findChildren();
        List<Future<Void>> results = new ArrayList<>();
        for (Container child : children) {
            results.add(startStopExecutor.submit(new StartChild(child)));
        }

        MultiThrowable multiThrowable = null;

        for (Future<Void> result : results) {
            try {
                result.get();
            } catch (Throwable e) {
                log.error(sm.getString("containerBase.threadedStartFailed"), e);
                if (multiThrowable == null) {
                    multiThrowable = new MultiThrowable();
                }
                multiThrowable.add(e);
            }

        }
        if (multiThrowable != null) {
            throw new LifecycleException(sm.getString("containerBase.threadedStartFailed"),
                    multiThrowable.getThrowable());
        }

        // Start the Valves in our pipeline (including the basic), if any
        if (pipeline instanceof Lifecycle) {
            ((Lifecycle) pipeline).start();
        }

        setState(LifecycleState.STARTING);

        // Start our thread
        if (backgroundProcessorDelay > 0) {
            monitorFuture = Container.getService(ContainerBase.this).getServer()
                    .getUtilityExecutor().scheduleWithFixedDelay(
                            new ContainerBackgroundProcessorMonitor(), 0, 60, TimeUnit.SECONDS);
        }
    }

@Override
    protected synchronized void stopInternal() throws LifecycleException {

        // Stop our thread
        if (monitorFuture != null) {
            monitorFuture.cancel(true);
            monitorFuture = null;
        }
        threadStop();

        setState(LifecycleState.STOPPING);

        // Stop the Valves in our pipeline (including the basic), if any
        if (pipeline instanceof Lifecycle &&
                ((Lifecycle) pipeline).getState().isAvailable()) {
            ((Lifecycle) pipeline).stop();
        }

        // Stop our child containers, if any
        Container children[] = findChildren();
        List<Future<Void>> results = new ArrayList<>();
        for (Container child : children) {
            results.add(startStopExecutor.submit(new StopChild(child)));
        }

        boolean fail = false;
        for (Future<Void> result : results) {
            try {
                result.get();
            } catch (Exception e) {
                log.error(sm.getString("containerBase.threadedStopFailed"), e);
                fail = true;
            }
        }
        if (fail) {
            throw new LifecycleException(
                    sm.getString("containerBase.threadedStopFailed"));
        }

        // Stop our subordinate components, if any
        Realm realm = getRealmInternal();
        if (realm instanceof Lifecycle) {
            ((Lifecycle) realm).stop();
        }
        Cluster cluster = getClusterInternal();
        if (cluster instanceof Lifecycle) {
            ((Lifecycle) cluster).stop();
        }
    }

@Override
    protected void initInternal() throws LifecycleException {
        reconfigureStartStopExecutor(getStartStopThreads());
        super.initInternal();
    }

@Override
public int getStartStopThreads() {
    return startStopThreads;
}

private int startStopThreads = 1;

private void reconfigureStartStopExecutor(int threads) {
    if (threads == 1) {
        // Use a fake executor
        if (!(startStopExecutor instanceof InlineExecutorService)) {
            startStopExecutor = new InlineExecutorService();
        }
    } else {
        // Delegate utility execution to the Service
        Server server = Container.getService(this).getServer();
        server.setUtilityThreads(threads);
        startStopExecutor = server.getUtilityExecutor();
    }
}

// Start our child containers, if any
Container children[] = findChildren();
List<Future<Void>> results = new ArrayList<>();
for (Container child : children) {
    results.add(startStopExecutor.submit(new StartChild(child)));
}

private static class StartChild implements Callable<Void> {

    private Container child;

    public StartChild(Container child) {
        this.child = child;
    }

    @Override
    public Void call() throws LifecycleException {
        child.start();
        return null;
    }
}

public <T> Future<T> submit(Callable<T> task) {
    if (task == null) throw new NullPointerException();
    RunnableFuture<T> ftask = newTaskFor(task);
    execute(ftask);
    return ftask;
}
protected <T> RunnableFuture<T> newTaskFor(Callable<T> callable) {
    return new FutureTask<T>(callable);
}

@Override
public void execute(Runnable command) {
    synchronized (lock) {
        if (shutdown) {
            throw new RejectedExecutionException();
        }
        taskRunning = true;
    }
    command.run();
    synchronized (lock) {
        taskRunning = false;
        if (shutdown) {
            terminated = true;
            lock.notifyAll();
        }
    }
}

this.webServer = factory.getWebServer(getSelfInitializer());

private org.springframework.boot.web.servlet.ServletContextInitializer getSelfInitializer() {
		return this::selfInitialize;
	}

	private void selfInitialize(ServletContext servletContext) throws ServletException {
		prepareWebApplicationContext(servletContext);
		registerApplicationScope(servletContext);
		WebApplicationContextUtils.registerEnvironmentBeans(getBeanFactory(), servletContext);
		for (ServletContextInitializer beans : getServletContextInitializerBeans()) {
			beans.onStartup(servletContext);
		}
	}

protected Collection<ServletContextInitializer> getServletContextInitializerBeans() {
	return new ServletContextInitializerBeans(getBeanFactory());
}

public ServletContextInitializerBeans(ListableBeanFactory beanFactory,
			Class<? extends ServletContextInitializer>... initializerTypes) {
		this.initializers = new LinkedMultiValueMap<>();
		this.initializerTypes = (initializerTypes.length != 0) ? Arrays.asList(initializerTypes)
				: Collections.singletonList(ServletContextInitializer.class);
        // 这里是添加 ServletContextInitializer
		addServletContextInitializerBeans(beanFactory);
        // filter 是在这里
		addAdaptableBeans(beanFactory);
		List<ServletContextInitializer> sortedInitializers = this.initializers.values().stream()
				.flatMap((value) -> value.stream().sorted(AnnotationAwareOrderComparator.INSTANCE))
				.collect(Collectors.toList());
		this.sortedList = Collections.unmodifiableList(sortedInitializers);
		logMappings(this.initializers);
	}

protected void addAdaptableBeans(ListableBeanFactory beanFactory) {
	MultipartConfigElement multipartConfig = getMultipartConfig(beanFactory);
       // 这里把 Servlet 作为 RegistrationBean
	addAsRegistrationBean(beanFactory, Servlet.class, new ServletRegistrationBeanAdapter(multipartConfig));
       // 这里把 Filter 作为 RegistrationBean
	addAsRegistrationBean(beanFactory, Filter.class, new FilterRegistrationBeanAdapter());
	for (Class<?> listenerType : ServletListenerRegistrationBean.getSupportedTypes()) {
		addAsRegistrationBean(beanFactory, EventListener.class, (Class<EventListener>) listenerType,
				new ServletListenerRegistrationBeanAdapter());
	}
}

protected <T> void addAsRegistrationBean(ListableBeanFactory beanFactory, Class<T> type,
		RegistrationBeanAdapter<T> adapter) {
	addAsRegistrationBean(beanFactory, type, type, adapter);
}

private <T, B extends T> void addAsRegistrationBean(ListableBeanFactory beanFactory, Class<T> type,
		Class<B> beanType, RegistrationBeanAdapter<T> adapter) {
	List<Map.Entry<String, B>> entries = getOrderedBeansOfType(beanFactory, beanType, this.seen);
	for (Entry<String, B> entry : entries) {
		String beanName = entry.getKey();
		B bean = entry.getValue();
		if (this.seen.add(bean)) {
			// One that we haven't already seen
			RegistrationBean registration = adapter.createRegistrationBean(beanName, bean, entries.size());
			int order = getOrder(bean);
			registration.setOrder(order);
			this.initializers.add(type, registration);
			if (logger.isTraceEnabled()) {
				logger.trace("Created " + type.getSimpleName() + " initializer for bean '" + beanName + "'; order="
						+ order + ", resource=" + getResourceDescription(beanName, beanFactory));
			}
		}
	}
}

for (ServletContextInitializer beans : getServletContextInitializerBeans()) {
			beans.onStartup(servletContext);
		}

public Iterator<ServletContextInitializer> iterator() {
		return this.sortedList.iterator();
	}

public final void onStartup(ServletContext servletContext) throws ServletException {
	String description = getDescription();
	if (!isEnabled()) {
		logger.info(StringUtils.capitalize(description) + " was not registered (disabled)");
		return;
	}
	register(description, servletContext);
}