spring-source-1

我们知道spring mvc是通过ContextLoaderListener来监听web容器启动并在web上下文初始化,那spring mvc的ContextLoaderListener是怎么做到的呢
我带着这个疑问来看下spring源码

ContextLoadListener-UML

ContextLoadListener继承了ContextLoader,并实现了ServletContextListener

ServletContextListener是Servlet提供的接口类,监听了Web应用的生命周期,它提供了2个方法

//在所有filters和servlet初始化前,ServletContextListeners被
public void contextInitialized(ServletContextEvent sce);

//所有servlets和filters在调用本方法前被销毁
public void contextDestroyed(ServletContextEvent sce);

我们再来看看ContextLoaderListener在初始化的时候调用了ContextLoader类中的initWebApplicationContext方法
ContextLoader类在

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/**
* <p>Looks for a {@link #CONTEXT_CLASS_PARAM "contextClass"} parameter
* at the {@code web.xml} context-param level to specify the context
* class type, falling back to the default of
* {@link org.springframework.web.context.support.XmlWebApplicationContext}
* if not found. With the default ContextLoader implementation, any context class
* specified needs to implement the ConfigurableWebApplicationContext interface.
*
* CONTEXT_CLASS_PARAM
* 在配置文件中找不到这个变量,那么将使用默认的类型,org.springframework.web.context.support.XmlWebApplicationContext。
* 如果使用默认的ContextLoader实现类,任何一个ContextLoader都需要实现ConfigurableWebApplicationContext接口

* <p>Processes a {@link #CONFIG_LOCATION_PARAM "contextConfigLocation"}
* context-param and passes its value to the context instance, parsing it into
* potentially multiple file paths which can be separated by any number of
* commas and spaces, e.g. "WEB-INF/applicationContext1.xml,
* WEB-INF/applicationContext2.xml". Ant-style path patterns are supported as well,
* e.g. "WEB-INF/*Context.xml,WEB-INF/spring*.xml" or "WEB-INF/&#42;&#42;/*Context.xml".
* If not explicitly specified, the context implementation is supposed to use a
* default location (with XmlWebApplicationContext: "/WEB-INF/applicationContext.xml").
*
* <p>Note: In case of multiple config locations, later bean definitions will
* override ones defined in previously loaded files, at least when using one of
* Spring's default ApplicationContext implementations. This can be leveraged
* to deliberately override certain bean definitions via an extra XML file.
* 如果配置了多个文件路径,后面的配置文件将复写前面的配置文件中的内容
*/
public class ContextLoader {

/**
* web应用上下文id
*/
public static final String CONTEXT_ID_PARAM = "contextId";

/**
* 上下文配置路径
* @see org.springframework.web.context.support.XmlWebApplicationContext#DEFAULT_CONFIG_LOCATION
*/
public static final String CONFIG_LOCATION_PARAM = "contextConfigLocation";

/**
* WebApplicationContext的实现类
* @see #determineContextClass(ServletContext)
*/
public static final String CONTEXT_CLASS_PARAM = "contextClass";

/**
* 上下文相关全局特性
* @see #customizeContext(ServletContext, ConfigurableWebApplicationContext)
*/
public static final String CONTEXT_INITIALIZER_CLASSES_PARAM = "contextInitializerClasses";

/**
* 上下文相关全局特性
* @see #customizeContext(ServletContext, ConfigurableWebApplicationContext)
*/
public static final String GLOBAL_INITIALIZER_CLASSES_PARAM = "globalInitializerClasses";

/**
* BeanFactory工厂路径
*/
public static final String LOCATOR_FACTORY_SELECTOR_PARAM = "locatorFactorySelector";

/**
* Optional servlet context parameter (i.e., "{@code parentContextKey}")
* used only when obtaining a parent context using the default implementation
* of {@link #loadParentContext(ServletContext servletContext)}.
* Specifies the 'factoryKey' used in the
* {@link BeanFactoryLocator#useBeanFactory(String factoryKey)} method call,
* obtaining the parent application context from the BeanFactoryLocator instance.
* <p>Supplying this "parentContextKey" parameter is sufficient when relying
* on the default {@code classpath*:beanRefContext.xml} selector for
* candidate factory references.
*/
public static final String LOCATOR_FACTORY_KEY_PARAM = "parentContextKey";

/**
* Any number of these characters are considered delimiters between
* multiple values in a single init-param String value.
*/
private static final String INIT_PARAM_DELIMITERS = ",; \t\n";

/**
* Name of the class path resource (relative to the ContextLoader class)
* that defines ContextLoader's default strategy names.
*/
private static final String DEFAULT_STRATEGIES_PATH = "ContextLoader.properties";


private static final Properties defaultStrategies;

static {
// Load default strategy implementations from properties file.
// This is currently strictly internal and not meant to be customized
// by application developers.
try {
ClassPathResource resource = new ClassPathResource(DEFAULT_STRATEGIES_PATH, ContextLoader.class);
defaultStrategies = PropertiesLoaderUtils.loadProperties(resource);
}
catch (IOException ex) {
throw new IllegalStateException("Could not load 'ContextLoader.properties': " + ex.getMessage());
}
}


/**
* Map from (thread context) ClassLoader to corresponding 'current' WebApplicationContext.
*/
private static final Map<ClassLoader, WebApplicationContext> currentContextPerThread =
new ConcurrentHashMap<ClassLoader, WebApplicationContext>(1);

/**
* The 'current' WebApplicationContext, if the ContextLoader class is
* deployed in the web app ClassLoader itself.
*/
private static volatile WebApplicationContext currentContext;


/**
* The root WebApplicationContext instance that this loader manages.
*/
private WebApplicationContext context;

/**
* Holds BeanFactoryReference when loading parent factory via
* ContextSingletonBeanFactoryLocator.
*/
private BeanFactoryReference parentContextRef;

/** Actual ApplicationContextInitializer instances to apply to the context */
private final List<ApplicationContextInitializer<ConfigurableApplicationContext>> contextInitializers =
new ArrayList<ApplicationContextInitializer<ConfigurableApplicationContext>>();


/**
* Create a new {@code ContextLoader} that will create a web application context
* based on the "contextClass" and "contextConfigLocation" servlet context-params.
* See class-level documentation for details on default values for each.
* <p>This constructor is typically used when declaring the {@code
* ContextLoaderListener} subclass as a {@code <listener>} within {@code web.xml}, as
* a no-arg constructor is required.
* <p>The created application context will be registered into the ServletContext under
* the attribute name {@link WebApplicationContext#ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE}
* and subclasses are free to call the {@link #closeWebApplicationContext} method on
* container shutdown to close the application context.
* @see #ContextLoader(WebApplicationContext)
* @see #initWebApplicationContext(ServletContext)
* @see #closeWebApplicationContext(ServletContext)
*/
public ContextLoader() {
}

/**
* Create a new {@code ContextLoader} with the given application context. This
* constructor is useful in Servlet 3.0+ environments where instance-based
* registration of listeners is possible through the {@link ServletContext#addListener}
* API.
* <p>The context may or may not yet be {@linkplain
* ConfigurableApplicationContext#refresh() refreshed}. If it (a) is an implementation
* of {@link ConfigurableWebApplicationContext} and (b) has <strong>not</strong>
* already been refreshed (the recommended approach), then the following will occur:
* <ul>
* <li>If the given context has not already been assigned an {@linkplain
* ConfigurableApplicationContext#setId id}, one will be assigned to it</li>
* <li>{@code ServletContext} and {@code ServletConfig} objects will be delegated to
* the application context</li>
* <li>{@link #customizeContext} will be called</li>
* <li>Any {@link ApplicationContextInitializer}s specified through the
* "contextInitializerClasses" init-param will be applied.</li>
* <li>{@link ConfigurableApplicationContext#refresh refresh()} will be called</li>
* </ul>
* If the context has already been refreshed or does not implement
* {@code ConfigurableWebApplicationContext}, none of the above will occur under the
* assumption that the user has performed these actions (or not) per his or her
* specific needs.
* <p>See {@link org.springframework.web.WebApplicationInitializer} for usage examples.
* <p>In any case, the given application context will be registered into the
* ServletContext under the attribute name {@link
* WebApplicationContext#ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE} and subclasses are
* free to call the {@link #closeWebApplicationContext} method on container shutdown
* to close the application context.
* @param context the application context to manage
* @see #initWebApplicationContext(ServletContext)
* @see #closeWebApplicationContext(ServletContext)
*/
public ContextLoader(WebApplicationContext context) {
this.context = context;
}


/**
* Specify which {@link ApplicationContextInitializer} instances should be used
* to initialize the application context used by this {@code ContextLoader}.
* @since 4.2
* @see #configureAndRefreshWebApplicationContext
* @see #customizeContext
*/
@SuppressWarnings("unchecked")
public void setContextInitializers(ApplicationContextInitializer<?>... initializers) {
if (initializers != null) {
for (ApplicationContextInitializer<?> initializer : initializers) {
this.contextInitializers.add((ApplicationContextInitializer<ConfigurableApplicationContext>) initializer);
}
}
}


/**
* 初始化spring上下文
* @param servletContext current servlet context
* @return the new WebApplicationContext
* @see #ContextLoader(WebApplicationContext)
* @see #CONTEXT_CLASS_PARAM
* @see #CONFIG_LOCATION_PARAM
*/
public WebApplicationContext initWebApplicationContext(ServletContext servletContext) {
if (servletContext.getAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE) != null) {
throw new IllegalStateException(
"Cannot initialize context because there is already a root application context present - " +
"check whether you have multiple ContextLoader* definitions in your web.xml!");
}

Log logger = LogFactory.getLog(ContextLoader.class);
servletContext.log("Initializing Spring root WebApplicationContext");
if (logger.isInfoEnabled()) {
logger.info("Root WebApplicationContext: initialization started");
}
long startTime = System.currentTimeMillis();

try {
// 创建WebApplicationContext实现类
if (this.context == null) {
this.context = createWebApplicationContext(servletContext);
}
if (this.context instanceof ConfigurableWebApplicationContext) {
ConfigurableWebApplicationContext cwac = (ConfigurableWebApplicationContext) this.context;
//AtomicBoolean来保证原子性操作
if (!cwac.isActive()) {
// The context has not yet been refreshed -> provide services such as
// setting the parent context, setting the application context id, etc
if (cwac.getParent() == null) {
// The context instance was injected without an explicit parent ->
// determine parent for root web application context, if any.
ApplicationContext parent = loadParentContext(servletContext);
cwac.setParent(parent);
}
//ApplicationContext初始化,配置刷新上下文
configureAndRefreshWebApplicationContext(cwac, servletContext);
}
}
//WebApplicationContext放入servlet全局变量中
servletContext.setAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE, this.context);

ClassLoader ccl = Thread.currentThread().getContextClassLoader();
if (ccl == ContextLoader.class.getClassLoader()) {
currentContext = this.context;
}
else if (ccl != null) {
currentContextPerThread.put(ccl, this.context);
}

if (logger.isDebugEnabled()) {
logger.debug("Published root WebApplicationContext as ServletContext attribute with name [" +
WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE + "]");
}
if (logger.isInfoEnabled()) {
long elapsedTime = System.currentTimeMillis() - startTime;
logger.info("Root WebApplicationContext: initialization completed in " + elapsedTime + " ms");
}

return this.context;
}
catch (RuntimeException ex) {
logger.error("Context initialization failed", ex);
servletContext.setAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE, ex);
throw ex;
}
catch (Error err) {
logger.error("Context initialization failed", err);
servletContext.setAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE, err);
throw err;
}
}

/**
* 创建WebApplicationContext Bean
* @param sc current servlet context
* @return the root WebApplicationContext
*
* @see ConfigurableWebApplicationContext
*/
protected WebApplicationContext createWebApplicationContext(ServletContext sc) {
Class<?> contextClass = determineContextClass(sc);
if (!ConfigurableWebApplicationContext.class.isAssignableFrom(contextClass)) {
throw new ApplicationContextException("Custom context class [" + contextClass.getName() +
"] is not of type [" + ConfigurableWebApplicationContext.class.getName() + "]");
}
return (ConfigurableWebApplicationContext) BeanUtils.instantiateClass(contextClass);
}

/**
* 返回WebApplicationContext的实现类
* 默认是org.springframework.web.context.support.XmlWebApplicationContext
* @param servletContext current servlet context
* @return the WebApplicationContext implementation class to use
* @see #CONTEXT_CLASS_PARAM
* @see org.springframework.web.context.support.XmlWebApplicationContext
*/
protected Class<?> determineContextClass(ServletContext servletContext) {
String contextClassName = servletContext.getInitParameter(CONTEXT_CLASS_PARAM);
if (contextClassName != null) {
try {
return ClassUtils.forName(contextClassName, ClassUtils.getDefaultClassLoader());
}
catch (ClassNotFoundException ex) {
throw new ApplicationContextException(
"Failed to load custom context class [" + contextClassName + "]", ex);
}
}
else {
contextClassName = defaultStrategies.getProperty(WebApplicationContext.class.getName());
try {
return ClassUtils.forName(contextClassName, ContextLoader.class.getClassLoader());
}
catch (ClassNotFoundException ex) {
throw new ApplicationContextException(
"Failed to load default context class [" + contextClassName + "]", ex);
}
}
}

protected void configureAndRefreshWebApplicationContext(ConfigurableWebApplicationContext wac, ServletContext sc) {
if (ObjectUtils.identityToString(wac).equals(wac.getId())) {
// The application context id is still set to its original default value
// -> assign a more useful id based on available information
String idParam = sc.getInitParameter(CONTEXT_ID_PARAM);
if (idParam != null) {
wac.setId(idParam);
}
else {
// Generate default id...
wac.setId(ConfigurableWebApplicationContext.APPLICATION_CONTEXT_ID_PREFIX +
ObjectUtils.getDisplayString(sc.getContextPath()));
}
}

wac.setServletContext(sc);
String configLocationParam = sc.getInitParameter(CONFIG_LOCATION_PARAM);
if (configLocationParam != null) {
wac.setConfigLocation(configLocationParam);
}

// The wac environment's #initPropertySources will be called in any case when the context
// is refreshed; do it eagerly here to ensure servlet property sources are in place for
// use in any post-processing or initialization that occurs below prior to #refresh
ConfigurableEnvironment env = wac.getEnvironment();
if (env instanceof ConfigurableWebEnvironment) {
((ConfigurableWebEnvironment) env).initPropertySources(sc, null);
}

customizeContext(sc, wac);
//刷新动作,加载xml,bean
wac.refresh();
}

/**
* Customize the {@link ConfigurableWebApplicationContext} created by this
* ContextLoader after config locations have been supplied to the context
* but before the context is <em>refreshed</em>.
* <p>The default implementation {@linkplain #determineContextInitializerClasses(ServletContext)
* determines} what (if any) context initializer classes have been specified through
* {@linkplain #CONTEXT_INITIALIZER_CLASSES_PARAM context init parameters} and
* {@linkplain ApplicationContextInitializer#initialize invokes each} with the
* given web application context.
* <p>Any {@code ApplicationContextInitializers} implementing
* {@link org.springframework.core.Ordered Ordered} or marked with @{@link
* org.springframework.core.annotation.Order Order} will be sorted appropriately.
* @param sc the current servlet context
* @param wac the newly created application context
* @see #CONTEXT_INITIALIZER_CLASSES_PARAM
* @see ApplicationContextInitializer#initialize(ConfigurableApplicationContext)
*/
protected void customizeContext(ServletContext sc, ConfigurableWebApplicationContext wac) {
List<Class<ApplicationContextInitializer<ConfigurableApplicationContext>>> initializerClasses =
determineContextInitializerClasses(sc);

for (Class<ApplicationContextInitializer<ConfigurableApplicationContext>> initializerClass : initializerClasses) {
Class<?> initializerContextClass =
GenericTypeResolver.resolveTypeArgument(initializerClass, ApplicationContextInitializer.class);
if (initializerContextClass != null) {
Assert.isAssignable(initializerContextClass, wac.getClass(), String.format(
"Could not add context initializer [%s] since its generic parameter [%s] " +
"is not assignable from the type of application context used by this " +
"context loader [%s]: ", initializerClass.getName(), initializerContextClass.getName(),
wac.getClass().getName()));
}
this.contextInitializers.add(BeanUtils.instantiateClass(initializerClass));
}

AnnotationAwareOrderComparator.sort(this.contextInitializers);
for (ApplicationContextInitializer<ConfigurableApplicationContext> initializer : this.contextInitializers) {
initializer.initialize(wac);
}
}

/**
* Return the {@link ApplicationContextInitializer} implementation classes to use
* if any have been specified by {@link #CONTEXT_INITIALIZER_CLASSES_PARAM}.
* @param servletContext current servlet context
* @see #CONTEXT_INITIALIZER_CLASSES_PARAM
*/
protected List<Class<ApplicationContextInitializer<ConfigurableApplicationContext>>>
determineContextInitializerClasses(ServletContext servletContext) {

List<Class<ApplicationContextInitializer<ConfigurableApplicationContext>>> classes =
new ArrayList<Class<ApplicationContextInitializer<ConfigurableApplicationContext>>>();

String globalClassNames = servletContext.getInitParameter(GLOBAL_INITIALIZER_CLASSES_PARAM);
if (globalClassNames != null) {
for (String className : StringUtils.tokenizeToStringArray(globalClassNames, INIT_PARAM_DELIMITERS)) {
classes.add(loadInitializerClass(className));
}
}

String localClassNames = servletContext.getInitParameter(CONTEXT_INITIALIZER_CLASSES_PARAM);
if (localClassNames != null) {
for (String className : StringUtils.tokenizeToStringArray(localClassNames, INIT_PARAM_DELIMITERS)) {
classes.add(loadInitializerClass(className));
}
}

return classes;
}

@SuppressWarnings("unchecked")
private Class<ApplicationContextInitializer<ConfigurableApplicationContext>> loadInitializerClass(String className) {
try {
Class<?> clazz = ClassUtils.forName(className, ClassUtils.getDefaultClassLoader());
Assert.isAssignable(ApplicationContextInitializer.class, clazz);
return (Class<ApplicationContextInitializer<ConfigurableApplicationContext>>) clazz;
}
catch (ClassNotFoundException ex) {
throw new ApplicationContextException("Failed to load context initializer class [" + className + "]", ex);
}
}

/**
* Template method with default implementation (which may be overridden by a
* subclass), to load or obtain an ApplicationContext instance which will be
* used as the parent context of the root WebApplicationContext. If the
* return value from the method is null, no parent context is set.
* <p>The main reason to load a parent context here is to allow multiple root
* web application contexts to all be children of a shared EAR context, or
* alternately to also share the same parent context that is visible to
* EJBs. For pure web applications, there is usually no need to worry about
* having a parent context to the root web application context.
* <p>The default implementation uses
* {@link org.springframework.context.access.ContextSingletonBeanFactoryLocator},
* configured via {@link #LOCATOR_FACTORY_SELECTOR_PARAM} and
* {@link #LOCATOR_FACTORY_KEY_PARAM}, to load a parent context
* which will be shared by all other users of ContextsingletonBeanFactoryLocator
* which also use the same configuration parameters.
* @param servletContext current servlet context
* @return the parent application context, or {@code null} if none
* @see org.springframework.context.access.ContextSingletonBeanFactoryLocator
*/
protected ApplicationContext loadParentContext(ServletContext servletContext) {
ApplicationContext parentContext = null;
String locatorFactorySelector = servletContext.getInitParameter(LOCATOR_FACTORY_SELECTOR_PARAM);
String parentContextKey = servletContext.getInitParameter(LOCATOR_FACTORY_KEY_PARAM);

if (parentContextKey != null) {
// locatorFactorySelector may be null, indicating the default "classpath*:beanRefContext.xml"
BeanFactoryLocator locator = ContextSingletonBeanFactoryLocator.getInstance(locatorFactorySelector);
Log logger = LogFactory.getLog(ContextLoader.class);
if (logger.isDebugEnabled()) {
logger.debug("Getting parent context definition: using parent context key of '" +
parentContextKey + "' with BeanFactoryLocator");
}
this.parentContextRef = locator.useBeanFactory(parentContextKey);
parentContext = (ApplicationContext) this.parentContextRef.getFactory();
}

return parentContext;
}

/**
* Close Spring's web application context for the given servlet context. If
* the default {@link #loadParentContext(ServletContext)} implementation,
* which uses ContextSingletonBeanFactoryLocator, has loaded any shared
* parent context, release one reference to that shared parent context.
* <p>If overriding {@link #loadParentContext(ServletContext)}, you may have
* to override this method as well.
* @param servletContext the ServletContext that the WebApplicationContext runs in
*/
public void closeWebApplicationContext(ServletContext servletContext) {
servletContext.log("Closing Spring root WebApplicationContext");
try {
if (this.context instanceof ConfigurableWebApplicationContext) {
((ConfigurableWebApplicationContext) this.context).close();
}
}
finally {
ClassLoader ccl = Thread.currentThread().getContextClassLoader();
if (ccl == ContextLoader.class.getClassLoader()) {
currentContext = null;
}
else if (ccl != null) {
currentContextPerThread.remove(ccl);
}
servletContext.removeAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE);
if (this.parentContextRef != null) {
this.parentContextRef.release();
}
}
}


/**
* Obtain the Spring root web application context for the current thread
* (i.e. for the current thread's context ClassLoader, which needs to be
* the web application's ClassLoader).
* @return the current root web application context, or {@code null}
* if none found
* @see org.springframework.web.context.support.SpringBeanAutowiringSupport
*/
public static WebApplicationContext getCurrentWebApplicationContext() {
ClassLoader ccl = Thread.currentThread().getContextClassLoader();
if (ccl != null) {
WebApplicationContext ccpt = currentContextPerThread.get(ccl);
if (ccpt != null) {
return ccpt;
}
}
return currentContext;
}

}
您的支持就是我的动力