obtainFreshBeanFactory()方法的作用是获取新的beanFactory,销毁原有beanFactory、为每个bean生成BeanDefinition等,但是这里的bean并没有初始化出来 只是提取配置信息 定义相关的属性
进入查看源码
protected ConfigurableListableBeanFactory obtainFreshBeanFactory() {
refreshBeanFactory();
ConfigurableListableBeanFactory beanFactory = getBeanFactory();
if (logger.isDebugEnabled()) {
logger.debug("Bean factory for " + getDisplayName() + ": " + beanFactory);
}
return beanFactory;
}
Spring的源码的命名都是很规范,一般都可以望文生义,进入的一个方法refreshBeanFactory(),刷新BeanFactory,进入方法
refreshBeanFactory
protected final void refreshBeanFactory() throws BeansException {
if (hasBeanFactory()) {
destroyBeans();
closeBeanFactory();
}
try {
DefaultListableBeanFactory beanFactory = createBeanFactory();
beanFactory.setSerializationId(getId());
customizeBeanFactory(beanFactory);
loadBeanDefinitions(beanFactory);
synchronized (this.beanFactoryMonitor) {
this.beanFactory = beanFactory;
}
}
catch (IOException ex) {
throw new ApplicationContextException("I/O error parsing bean definition source for " + getDisplayName(), ex);
}
}
- 先销毁原有beanFactory;
- 创建并初始化BeanFactory;
- 加载BeanDefinitions。
关于这个方法,一个重要的类出现了,他就是DefaultListableBeanFactory
DefaultListableBeanFactory
它是Spring IOC容器的实现,从根源上是beanfactory,但真正可以作为一个可以独立使用的IOC容器还是DefaultListableBeanFactory
经过createBeanFactory()方法后,这个时候我们的BeanFactory初步形成 这也将是管理整个bean的核心接口
setSerializationId(getId())其作用是设置相应的序列化id
customizeBeanFactory()方法
进入customizeBeanFactory()方法
protected void customizeBeanFactory(DefaultListableBeanFactory beanFactory) {
if (this.allowBeanDefinitionOverriding != null) {
//是否允许bean定义的覆盖
// BeanDefinition 的覆盖问题大家也许会碰到,
// 就是在配置文件中定义 bean 时使用了相同的 id 或 name
// ,默认情况下,allowBeanDefinitionOverriding 属性为 null,
// 如果在同一配置文件中重复了,会抛错,但是如果不是同一配置文件中,会发生覆盖。
beanFactory.setAllowBeanDefinitionOverriding(this.allowBeanDefinitionOverriding);
}
if (this.allowCircularReferences != null) {
//是否允许bean 间的循环依赖
// A 依赖 B,而 B 依赖 A。或 A 依赖 B,B 依赖 C,而 C 依赖 A
// 默认情况下,Spring 允许循环依赖,当然如果你在 A 的构造方法中依赖 B,在 B 的构造方法中依赖 A 是不行的。
beanFactory.setAllowCircularReferences(this.allowCircularReferences);
}
}
loadBeanDefinitions()方法
创建BeanFactory最核心的方法就是loadBeanDefinitions()方法,这个方法将开始解析配置 转化为对应的BeanDefinition对象
protected void loadBeanDefinitions(DefaultListableBeanFactory beanFactory) throws BeansException, IOException {
// Create a new XmlBeanDefinitionReader for the given BeanFactory.
XmlBeanDefinitionReader beanDefinitionReader = new XmlBeanDefinitionReader(beanFactory);
// Configure the bean definition reader with this context's
// resource loading environment.
beanDefinitionReader.setEnvironment(this.getEnvironment());
beanDefinitionReader.setResourceLoader(this);
beanDefinitionReader.setEntityResolver(new ResourceEntityResolver(this));
// Allow a subclass to provide custom initialization of the reader,
// then proceed with actually loading the bean definitions.
initBeanDefinitionReader(beanDefinitionReader);
loadBeanDefinitions(beanDefinitionReader);
}
XmlBeanDefinitionReader初始化,无非是初始化自己与父类,在这里最后一个方法loadBeanDefinitions方法开始加载xml文件
进入该方法
loadBeanDefinitions()方法
protected void loadBeanDefinitions(XmlBeanDefinitionReader reader) throws BeansException, IOException {
//扩展,默认是null。子类实现
Resource[] configResources = getConfigResources();
if (configResources != null) {
reader.loadBeanDefinitions(configResources);
}
//ClassPathXmlApplicationContext构造函数传入的applicationContext.xml
String[] configLocations = getConfigLocations();
if (configLocations != null) {
//正式解析
reader.loadBeanDefinitions(configLocations);
}
}
继续看reader.loadBeanDefinitions方法,查看它是怎么解析的
public int loadBeanDefinitions(String... locations) throws BeanDefinitionStoreException {
Assert.notNull(locations, "Location array must not be null");
int counter = 0;
for (String location : locations) {
counter += loadBeanDefinitions(location);
}
return counter;
}
解析继续调用loadBeanDefinitions方法了,继续查看该方法
开始将XML解析为Resource
public int loadBeanDefinitions(String location, Set<Resource> actualResources) throws BeanDefinitionStoreException {
//获取当前资源加载器,这里是ClassPathXmlApplicationContext
ResourceLoader resourceLoader = getResourceLoader();
if (resourceLoader == null) {
throw new BeanDefinitionStoreException(
"Cannot import bean definitions from location [" + location + "]: no ResourceLoader available");
}
//ClassPathXmlApplicationContext继承了ResourcePatternResolver
if (resourceLoader instanceof ResourcePatternResolver) {
// Resource pattern matching available.
try {
//吧Xml解析为Resource
Resource[] resources = ((ResourcePatternResolver) resourceLoader).getResources(location);
//解析resource
int loadCount = loadBeanDefinitions(resources);
if (actualResources != null) {
for (Resource resource : resources) {
actualResources.add(resource);
}
}
if (logger.isDebugEnabled()) {
logger.debug("Loaded " + loadCount + " bean definitions from location pattern [" + location + "]");
}
return loadCount;
}
catch (IOException ex) {
throw new BeanDefinitionStoreException(
"Could not resolve bean definition resource pattern [" + location + "]", ex);
}
}
else {
// Can only load single resources by absolute URL.
Resource resource = resourceLoader.getResource(location);
int loadCount = loadBeanDefinitions(resource);
if (actualResources != null) {
actualResources.add(resource);
}
if (logger.isDebugEnabled()) {
logger.debug("Loaded " + loadCount + " bean definitions from location [" + location + "]");
}
return loadCount;
}
}
先查看Spring是怎么将XML解析成Resource的把
public Resource[] getResources(String locationPattern) throws IOException {
Assert.notNull(locationPattern, "Location pattern must not be null");
//是不是以classpath*:开始的
if (locationPattern.startsWith(CLASSPATH_ALL_URL_PREFIX)) {
//以classpath*:开始的
if (getPathMatcher().isPattern(locationPattern.substring(CLASSPATH_ALL_URL_PREFIX.length()))) {
// 路径中有?或*号通配符 如classpath*:applicationContext-*.xml
return findPathMatchingResources(locationPattern);
}
else {
// 路径没有?或*号通配符 如classpath*:applicationContext.xml
return findAllClassPathResources(locationPattern.substring(CLASSPATH_ALL_URL_PREFIX.length()));
}
}
else {
//不以classpath*:开始的
int prefixEnd = locationPattern.indexOf(":") + 1;
if (getPathMatcher().isPattern(locationPattern.substring(prefixEnd))) {
// 路径中有?或*号通配符
return findPathMatchingResources(locationPattern);
}
else {
// 路径没有?或*号通配符
return new Resource[] {getResourceLoader().getResource(locationPattern)};
}
}
}
通过不同的判断,完成了不同的解析,妙呀
解析上一个方法获得Resource
继续回到loadBeanDefinitions方法,下一个解析XML文件方法
public int loadBeanDefinitions(EncodedResource encodedResource) throws BeanDefinitionStoreException {
Assert.notNull(encodedResource, "EncodedResource must not be null");
if (logger.isInfoEnabled()) {
logger.info("Loading XML bean definitions from " + encodedResource.getResource());
}
//resourcesCurrentlyBeingLoaded是个ThreadLocal<Set<EncodedResource>>变量
//得到变量中存放的值,注意每个线程得到的都是一个拷贝
Set<EncodedResource> currentResources = this.resourcesCurrentlyBeingLoaded.get();
//第一次加载是null
if (currentResources == null) {
currentResources = new HashSet<EncodedResource>(4);
this.resourcesCurrentlyBeingLoaded.set(currentResources);
}
//把资源放进set中,纪录已加载内容,不能加载重复内容
if (!currentResources.add(encodedResource)) {
throw new BeanDefinitionStoreException(
"Detected cyclic loading of " + encodedResource + " - check your import definitions!");
}
try {
//得到该Resource的InputStream
InputStream inputStream = encodedResource.getResource().getInputStream();
try {
//用InputSource封装InputStream,此类是org.xml.sax包下的
InputSource inputSource = new InputSource(inputStream);
//如果encodedResource的编码格式不为空,设置InputSource编码格式
if (encodedResource.getEncoding() != null) {
inputSource.setEncoding(encodedResource.getEncoding());
}
//do..开始真正的解析
return doLoadBeanDefinitions(inputSource, encodedResource.getResource());
}
finally {
inputStream.close();
}
}
catch (IOException ex) {
throw new BeanDefinitionStoreException(
"IOException parsing XML document from " + encodedResource.getResource(), ex);
}
finally {
//加载完成后清空缓存
currentResources.remove(encodedResource);
if (currentResources.isEmpty()) {
this.resourcesCurrentlyBeingLoaded.remove();
}
}
}
继续进入doLoadBeanDefinitions方法
验证约束文件
protected int doLoadBeanDefinitions(InputSource inputSource, Resource resource)
throws BeanDefinitionStoreException {
try {
//加载Xml得到Document对象,也验证了DTD约束
Document doc = doLoadDocument(inputSource, resource);
//根据Document注册BeanDefinitions
return registerBeanDefinitions(doc, resource);
}
catch (BeanDefinitionStoreException ex) {
throw ex;
}
catch (SAXParseException ex) {
throw new XmlBeanDefinitionStoreException(resource.getDescription(),
"Line " + ex.getLineNumber() + " in XML document from " + resource + " is invalid", ex);
}
catch (SAXException ex) {
throw new XmlBeanDefinitionStoreException(resource.getDescription(),
"XML document from " + resource + " is invalid", ex);
}
catch (ParserConfigurationException ex) {
throw new BeanDefinitionStoreException(resource.getDescription(),
"Parser configuration exception parsing XML from " + resource, ex);
}
catch (IOException ex) {
throw new BeanDefinitionStoreException(resource.getDescription(),
"IOException parsing XML document from " + resource, ex);
}
catch (Throwable ex) {
throw new BeanDefinitionStoreException(resource.getDescription(),
"Unexpected exception parsing XML document from " + resource, ex);
}
}
接着进入registerBeanDefinitions方法
执行注册Resource
public int registerBeanDefinitions(Document doc, Resource resource) throws BeanDefinitionStoreException {
//实例化BeanDefinitionDocumentReader的实现类DefaultBeanDefinitionDocumentReader
BeanDefinitionDocumentReader documentReader = createBeanDefinitionDocumentReader();
//记录注册之前的数值
int countBefore = getRegistry().getBeanDefinitionCount();
//执行注册
documentReader.registerBeanDefinitions(doc, createReaderContext(resource));
//注册的数值
return getRegistry().getBeanDefinitionCount() - countBefore;
}
进入registerBeanDefinitions方法
public void registerBeanDefinitions(Document doc, XmlReaderContext readerContext) {
this.readerContext = readerContext;
logger.debug("Loading bean definitions");
//获取rootElement
Element root = doc.getDocumentElement();
//do。。真正进行注册
doRegisterBeanDefinitions(root);
}
真正开始注册获得的XML文件
protected void doRegisterBeanDefinitions(Element root) {
//专用来解析的类
BeanDefinitionParserDelegate parent = this.delegate;
this.delegate = createDelegate(getReaderContext(), root, parent);
//判断root的命名空间是不是默认的
if (this.delegate.isDefaultNamespace(root)) {
//处理profile属性
String profileSpec = root.getAttribute(PROFILE_ATTRIBUTE);
if (StringUtils.hasText(profileSpec)) {
String[] specifiedProfiles = StringUtils.tokenizeToStringArray(
profileSpec, BeanDefinitionParserDelegate.MULTI_VALUE_ATTRIBUTE_DELIMITERS);
if (!getReaderContext().getEnvironment().acceptsProfiles(specifiedProfiles)) {
return;
}
}
}
//扩展,解析前处理
preProcessXml(root);
//解析
parseBeanDefinitions(root, this.delegate);
//扩展,解析后处理
postProcessXml(root);
this.delegate = parent;
}
解析XML文件之命名空间
protected void parseBeanDefinitions(Element root, BeanDefinitionParserDelegate delegate) {
//获取命名空间
if (delegate.isDefaultNamespace(root)) {
//获取所子节点
NodeList nl = root.getChildNodes();
for (int i = 0; i < nl.getLength(); i++) {
Node node = nl.item(i);
if (node instanceof Element) {
Element ele = (Element) node;
//子节点的命名空间
if (delegate.isDefaultNamespace(ele)) {
//默认命名空间标签
parseDefaultElement(ele, delegate);
}
else {
//自定义命名空间标签
delegate.parseCustomElement(ele);
}
}
}
}
else {
//自定义命名空间标签
delegate.parseCustomElement(root);
}
}
接着进入parseDefaultElement方法
解析四种默认标签import,alias,bean,beans
private void parseDefaultElement(Element ele, BeanDefinitionParserDelegate delegate) {
//import
if (delegate.nodeNameEquals(ele, IMPORT_ELEMENT)) {
importBeanDefinitionResource(ele);
}
//alias
else if (delegate.nodeNameEquals(ele, ALIAS_ELEMENT)) {
processAliasRegistration(ele);
}
//bean
else if (delegate.nodeNameEquals(ele, BEAN_ELEMENT)) {
processBeanDefinition(ele, delegate);
}
//beans
else if (delegate.nodeNameEquals(ele, NESTED_BEANS_ELEMENT)) {
// recurse
doRegisterBeanDefinitions(ele);
}
}
我们这里暂时先看一下怎么解析Bean标签的,进入processBeanDefinition方法
protected void processBeanDefinition(Element ele, BeanDefinitionParserDelegate delegate) {
//解析bean标签,返回其包装类
BeanDefinitionHolder bdHolder = delegate.parseBeanDefinitionElement(ele);
if (bdHolder != null) {
//bean标签下还有自定义标签再次解析,一般没用过
bdHolder = delegate.decorateBeanDefinitionIfRequired(ele, bdHolder);
try {
// 注册
BeanDefinitionReaderUtils.registerBeanDefinition(bdHolder, getReaderContext().getRegistry());
}
catch (BeanDefinitionStoreException ex) {
getReaderContext().error("Failed to register bean definition with name '" +
bdHolder.getBeanName() + "'", ele, ex);
}
// Send registration event.
getReaderContext().fireComponentRegistered(new BeanComponentDefinition(bdHolder));
}
}
可以在这里打个断点,查看下值
可以发现,Spring已经获得了我们的XML中Bean id为Student的元素了,所以目前重点看parseBeanDefinitionElement方法
获得XML中的值
public BeanDefinitionHolder parseBeanDefinitionElement(Element ele, BeanDefinition containingBean) {
//获取id与name属性
String id = ele.getAttribute(ID_ATTRIBUTE);
String nameAttr = ele.getAttribute(NAME_ATTRIBUTE);
//name属性解析为别名
List<String> aliases = new ArrayList<String>();
if (StringUtils.hasLength(nameAttr)) {
String[] nameArr = StringUtils.tokenizeToStringArray(nameAttr, MULTI_VALUE_ATTRIBUTE_DELIMITERS);
aliases.addAll(Arrays.asList(nameArr));
}
//如果id不存在,别名存在(指name),把name的第一个作为bean的name
String beanName = id;
if (!StringUtils.hasText(beanName) && !aliases.isEmpty()) {
beanName = aliases.remove(0);
if (logger.isDebugEnabled()) {
logger.debug("No XML 'id' specified - using '" + beanName +
"' as bean name and " + aliases + " as aliases");
}
}
//检查beanName与别名是否已经被别的bean引用过,即不能定义两个bean的id相同或别名相同
if (containingBean == null) {
checkNameUniqueness(beanName, aliases, ele);
}
//解析bean属性,并封装为BeanDefinition
AbstractBeanDefinition beanDefinition = parseBeanDefinitionElement(ele, beanName, containingBean);
if (beanDefinition != null) {
if (!StringUtils.hasText(beanName)) {
//如果beanName为空,Spring自动生成beanName
try {
if (containingBean != null) {
beanName = BeanDefinitionReaderUtils.generateBeanName(
beanDefinition, this.readerContext.getRegistry(), true);
}
else {
//此方法containingBean为null
//beanName为class+#+数字,比如注册两个类型相同的bean,后面数字是0和1
beanName = this.readerContext.generateBeanName(beanDefinition);
//beanClassName设置为别名
String beanClassName = beanDefinition.getBeanClassName();
if (beanClassName != null &&
beanName.startsWith(beanClassName) && beanName.length() > beanClassName.length() &&
!this.readerContext.getRegistry().isBeanNameInUse(beanClassName)) {
aliases.add(beanClassName);
}
}
if (logger.isDebugEnabled()) {
logger.debug("Neither XML 'id' nor 'name' specified - " +
"using generated bean name [" + beanName + "]");
}
}
catch (Exception ex) {
error(ex.getMessage(), ele);
return null;
}
}
String[] aliasesArray = StringUtils.toStringArray(aliases);
//根据beanDefinition, beanName, aliasesArray创建BeanDefinitionHolder实例
return new BeanDefinitionHolder(beanDefinition, beanName, aliasesArray);
}
return null;
}
这里又出现了一个beanDefinition,打个断点查看值
这里一切都清楚了,重点代码在parseBeanDefinitionElement中,继续查看
正式获得XML中Bean的值
public AbstractBeanDefinition parseBeanDefinitionElement(
Element ele, String beanName, BeanDefinition containingBean) {
this.parseState.push(new BeanEntry(beanName));
//解析class属性
String className = null;
if (ele.hasAttribute(CLASS_ATTRIBUTE)) {
className = ele.getAttribute(CLASS_ATTRIBUTE).trim();
}
try {
//解析parent属性
String parent = null;
if (ele.hasAttribute(PARENT_ATTRIBUTE)) {
parent = ele.getAttribute(PARENT_ATTRIBUTE);
}
//根据className, parent创建GenericBeanDefinition对象用来存储解析出的各种属性
AbstractBeanDefinition bd = createBeanDefinition(className, parent);
//解析bean上的属性
parseBeanDefinitionAttributes(ele, beanName, containingBean, bd);
//Description
bd.setDescription(DomUtils.getChildElementValueByTagName(ele, DESCRIPTION_ELEMENT));
//解析meta标签
parseMetaElements(ele, bd);
//解析lookup-method属性
parseLookupOverrideSubElements(ele, bd.getMethodOverrides());
//解析replace-method属性
parseReplacedMethodSubElements(ele, bd.getMethodOverrides());
//解析constructor-arg标签
parseConstructorArgElements(ele, bd);
//解析property标签
parsePropertyElements(ele, bd);
//解析qualifier标签
parseQualifierElements(ele, bd);
bd.setResource(this.readerContext.getResource());
bd.setSource(extractSource(ele));
return bd;
}
catch (ClassNotFoundException ex) {
error("Bean class [" + className + "] not found", ele, ex);
}
catch (NoClassDefFoundError err) {
error("Class that bean class [" + className + "] depends on not found", ele, err);
}
catch (Throwable ex) {
error("Unexpected failure during bean definition parsing", ele, ex);
}
finally {
this.parseState.pop();
}
return null;
}
有兴趣的朋友可以自己查看先具体解析代码了,这里就不一一赘述了
所以bean解析完成后返回一个AbstractBeanDefinition,这个实例已经包含了所有解析到的属性
最后,我们都知道所以的Bean都会装入一个beanDefinitionMap中,下面看看是怎么装入的
Bean装入Map中
回到方法
protected void processBeanDefinition(Element ele, BeanDefinitionParserDelegate delegate) {
//解析bean标签,返回其包装类
BeanDefinitionHolder bdHolder = delegate.parseBeanDefinitionElement(ele);
if (bdHolder != null) {
//bean标签下还有自定义标签再次解析,一般没用过
bdHolder = delegate.decorateBeanDefinitionIfRequired(ele, bdHolder);
try {
// 注册
BeanDefinitionReaderUtils.registerBeanDefinition(bdHolder, getReaderContext().getRegistry());
}
catch (BeanDefinitionStoreException ex) {
getReaderContext().error("Failed to register bean definition with name '" +
bdHolder.getBeanName() + "'", ele, ex);
}
// Send registration event.
getReaderContext().fireComponentRegistered(new BeanComponentDefinition(bdHolder));
}
}
查看方法registerBeanDefinition
public static void registerBeanDefinition(
BeanDefinitionHolder definitionHolder, BeanDefinitionRegistry registry)
throws BeanDefinitionStoreException {
//BeanDefinition注册
String beanName = definitionHolder.getBeanName();
registry.registerBeanDefinition(beanName, definitionHolder.getBeanDefinition());
// 别名注册
String[] aliases = definitionHolder.getAliases();
if (aliases != null) {
for (String alias : aliases) {
registry.registerAlias(beanName, alias);
}
}
}
}
最后进入registerBeanDefinition方法
public void registerBeanDefinition(String beanName, BeanDefinition beanDefinition)
throws BeanDefinitionStoreException {
Assert.hasText(beanName, "Bean name must not be empty");
Assert.notNull(beanDefinition, "BeanDefinition must not be null");
if (beanDefinition instanceof AbstractBeanDefinition) {
try {
//验证针对methodoverrides进行验证,因为基本不设置这两个属性,不做解析
((AbstractBeanDefinition) beanDefinition).validate();
}
catch (BeanDefinitionValidationException ex) {
throw new BeanDefinitionStoreException(beanDefinition.getResourceDescription(), beanName,
"Validation of bean definition failed", ex);
}
}
BeanDefinition oldBeanDefinition;
//beanDefinitionMap是否存在beanName的beanDefinition
oldBeanDefinition = this.beanDefinitionMap.get(beanName);
//存在
if (oldBeanDefinition != null) {
//不允许覆盖,报错
if (!isAllowBeanDefinitionOverriding()) {
throw new BeanDefinitionStoreException(beanDefinition.getResourceDescription(), beanName,
"Cannot register bean definition [" + beanDefinition + "] for bean '" + beanName +
"': There is already [" + oldBeanDefinition + "] bound.");
}
//角色问题
else if (oldBeanDefinition.getRole() < beanDefinition.getRole()) {
// e.g. was ROLE_APPLICATION, now overriding with ROLE_SUPPORT or ROLE_INFRASTRUCTURE
if (this.logger.isWarnEnabled()) {
this.logger.warn("Overriding user-defined bean definition for bean '" + beanName +
"' with a framework-generated bean definition: replacing [" +
oldBeanDefinition + "] with [" + beanDefinition + "]");
}
}
//两者不等
else if (!beanDefinition.equals(oldBeanDefinition)) {
if (this.logger.isInfoEnabled()) {
this.logger.info("Overriding bean definition for bean '" + beanName +
"' with a different definition: replacing [" + oldBeanDefinition +
"] with [" + beanDefinition + "]");
}
}
else {
if (this.logger.isDebugEnabled()) {
this.logger.debug("Overriding bean definition for bean '" + beanName +
"' with an equivalent definition: replacing [" + oldBeanDefinition +
"] with [" + beanDefinition + "]");
}
}
//beanName为key,beanDefinition为value存入map
this.beanDefinitionMap.put(beanName, beanDefinition);
}
else {
//判断工厂Bean是否已经处于创造阶段并且被标记,是在没遇到过的场景
if (hasBeanCreationStarted()) {
// Cannot modify startup-time collection elements anymore (for stable iteration)
synchronized (this.beanDefinitionMap) {
this.beanDefinitionMap.put(beanName, beanDefinition);
List<String> updatedDefinitions = new ArrayList<String>(this.beanDefinitionNames.size() + 1);
updatedDefinitions.addAll(this.beanDefinitionNames);
updatedDefinitions.add(beanName);
this.beanDefinitionNames = updatedDefinitions;
if (this.manualSingletonNames.contains(beanName)) {
Set<String> updatedSingletons = new LinkedHashSet<String>(this.manualSingletonNames);
updatedSingletons.remove(beanName);
this.manualSingletonNames = updatedSingletons;
}
}
}
else {
// Still in startup registration phase
//beanName为key,beanDefinition为value存入map
this.beanDefinitionMap.put(beanName, beanDefinition);
//beanName加入到beanDefinitionNames中
this.beanDefinitionNames.add(beanName);
//清除缓存中的此beanName
this.manualSingletonNames.remove(beanName);
}
this.frozenBeanDefinitionNames = null;
}
if (oldBeanDefinition != null || containsSingleton(beanName)) {
resetBeanDefinition(beanName);
}
}
经过大量的判断后,符合条件的会装入beanDefinitionMap中至此,注册完了,这里的注册类是DefaultListableBeanFactory,此类中的beanDefinitionMap属性存储了beanName与BeanDenifition的映射,beanDefinitionNames存储了所有的beanName
总结
- obtainFreshBeanFactory方法的作用获取新的beanFactory,销毁原有beanFactory、为每个bean生成BeanDefinition等
- 注册类是DefaultListableBeanFactory此类中的beanDefinitionMap属性存储了beanName与BeanDenifition的映射
- beanDefinitionNames存储了所有的beanName
- 所以的Bean都被装入beanDefinitionMap中
- obtainFreshBeanFactory方法这里的bean并没有初始化出来 只是提取配置信息定义相关的属性
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