Spring Aplication Contectのロード過程を詳しく説明します。
24845 ワード
1、入り口を探して、Class PathXml AppleicationConteetの構造方法を使って配置ファイルをロードして、classPathの下の配置ファイルをロードします。
// ， spring ， spring
ClassPathXmlApplicationContext context=new ClassPathXmlApplicationContext(
"classpath:spring-mvc.xml");
// Bean
Person person=context.getBean("person",Person.class);
public ClassPathXmlApplicationContext(String[] configLocations, boolean refresh, ApplicationContext parent)
throws BeansException {
// ApplicationContext，null
super(parent);
//1. ， 2. ${placeholder}
setConfigLocations(configLocations);
if (refresh) {
refresh();
}
}
//locations :
public void setConfigLocations(String[] locations) {
if (locations != null) {
//
Assert.noNullElements(locations, "Config locations must not be null");
// ，
this.configLocations = new String[locations.length];
// locations，
for (int i = 0; i < locations.length; i++) {
// resolvePath
this.configLocations[i] = resolvePath(locations[i]).trim();
}
}
else {
this.configLocations = null;
}
}
/**
* text :
* PropertyPlaceholderHelper ： ，
*/
private String doResolvePlaceholders(String text, PropertyPlaceholderHelper helper) {
// PropertyPlaceholderHelper replacePlaceholders
return helper.replacePlaceholders(text, new PropertyPlaceholderHelper.PlaceholderResolver() {
public String resolvePlaceholder(String placeholderName) {
return getPropertyAsRawString(placeholderName);
}
});
}
public String replacePlaceholders(String value, PlaceholderResolver placeholderResolver) {
Assert.notNull(value, "Argument 'value' must not be null.");
// parseStringValue
return parseStringValue(value, placeholderResolver, new HashSet<String>());
}
/**
* strVal ： ，
* placeholderResolver ： ，
* visitedPlaceholders ：
**/
protected String parseStringValue(
String strVal, PlaceholderResolver placeholderResolver, Set<String> visitedPlaceholders) {
// strval StringBuilder，
StringBuilder buf = new StringBuilder(strVal);
//this.placeholderPrefix ${, PropertyHelper placeholderPrefix="${" ,placeholderSuffix="}",valueSeparator=":"
//
int startIndex = strVal.indexOf(this.placeholderPrefix);
while (startIndex != -1) {
//
int endIndex = findPlaceholderEndIndex(buf, startIndex);
//
if (endIndex != -1) {
// ${plcaeholder} placeholder
String placeholder = buf.substring(startIndex + this.placeholderPrefix.length(), endIndex);
// placeholder
String originalPlaceholder = placeholder;
// ， ，
if (!visitedPlaceholders.add(originalPlaceholder)) {
throw new IllegalArgumentException(
"Circular placeholder reference '" + originalPlaceholder + "' in property definitions");
}
// palceholder
placeholder = parseStringValue(placeholder, placeholderResolver, visitedPlaceholders);
// ， placeholder ， java.version 1.8.0_60
String propVal = placeholderResolver.resolvePlaceholder(placeholder);
if (propVal == null && this.valueSeparator != null) {
int separatorIndex = placeholder.indexOf(this.valueSeparator);
if (separatorIndex != -1) {
String actualPlaceholder = placeholder.substring(0, separatorIndex);
String defaultValue = placeholder.substring(separatorIndex + this.valueSeparator.length());
propVal = placeholderResolver.resolvePlaceholder(actualPlaceholder);
if (propVal == null) {
propVal = defaultValue;
}
}
}
// ， ${java.version} 1.8.0_60
if (propVal != null) {
// 1.8.0_60
propVal = parseStringValue(propVal, placeholderResolver, visitedPlaceholders);
// ， ${java.version} 1.8.0_60
buf.replace(startIndex, endIndex + this.placeholderSuffix.length(), propVal);
if (logger.isTraceEnabled()) {
logger.trace("Resolved placeholder '" + placeholder + "'");
}
// ， ，
startIndex = buf.indexOf(this.placeholderPrefix, startIndex + propVal.length());
}
else if (this.ignoreUnresolvablePlaceholders) {
// Proceed with unprocessed value.
startIndex = buf.indexOf(this.placeholderPrefix, endIndex + this.placeholderSuffix.length());
}
else {
throw new IllegalArgumentException("Could not resolve placeholder '" +
placeholder + "'" + " in string value \"" + strVal + "\"");
}
//
visitedPlaceholders.remove(originalPlaceholder);
}
else {
startIndex = -1;
}
}
return buf.toString(); //
}
// spring
public void refresh() throws BeansException, IllegalStateException {
synchronized (this.startupShutdownMonitor) {
// ， ， ， ，
prepareRefresh();
// beanFactory， beanFactory， ， 10
ConfigurableListableBeanFactory beanFactory = obtainFreshBeanFactory();
// ， 12
prepareBeanFactory(beanFactory);
try {
//
postProcessBeanFactory(beanFactory);
// BeanFactoryPostProcessor BeanDefintionRegistoryPostProcessor
invokeBeanFactoryPostProcessors(beanFactory);
// BeanPostProcessor, bean ， 14
registerBeanPostProcessors(beanFactory);
//
initMessageSource();
// ， ， ， SimpleApplicationEventMulticaster
initApplicationEventMulticaster();
// bean
onRefresh();
//
registerListeners();
// (non-lazy-init)
finishBeanFactoryInitialization(beanFactory);
// ， ......
finishRefresh();
}
catch (BeansException ex) {
// Destroy already created singletons to avoid dangling resources.
destroyBeans();
// Reset 'active' flag.
cancelRefresh(ex);
// Propagate exception to caller.
throw ex;
}
}
}
//AbastractApplicationContext
protected ConfigurableListableBeanFactory obtainFreshBeanFactory() {
// ， ， loadBeanDefinitions(beanFactory); BeanDefiniton
refreshBeanFactory();
ConfigurableListableBeanFactory beanFactory = getBeanFactory();
if (logger.isDebugEnabled()) {
logger.debug("Bean factory for " + getDisplayName() + ": " + beanFactory);
}
return beanFactory;
}
//org.springframework.context.support.AbstractRefreshableApplicationContext
//AbstractApplicationContext
@Override
protected final void refreshBeanFactory() throws BeansException {
// beanfactory，
if (hasBeanFactory()) {
destroyBeans();
closeBeanFactory();
}
try {
// beanFactory
DefaultListableBeanFactory beanFactory = createBeanFactory();
// id
beanFactory.setSerializationId(getId());
// beanFactory， ，
// @Autowired @Qualifier， QualifierAnnotationAutowireCandidateResolver
customizeBeanFactory(beanFactory);
// BeanDefine 11
loadBeanDefinitions(beanFactory);
synchronized (this.beanFactoryMonitor) {
this.beanFactory = beanFactory;
}
}
catch (IOException ex) {
throw new ApplicationContextException("I/O error parsing bean definition source for " + getDisplayName(), ex);
}
}
// org.springframework.context.support.AbstractXmlApplicationContext
protected void loadBeanDefinitions(DefaultListableBeanFactory beanFactory) throws BeansException, IOException {
// beanDefinitionReader， BeanDefinition
XmlBeanDefinitionReader beanDefinitionReader = new XmlBeanDefinitionReader(beanFactory);
// XmlBeanDefinitionReader
beanDefinitionReader.setEnvironment(this.getEnvironment());
beanDefinitionReader.setResourceLoader(this);
beanDefinitionReader.setEntityResolver(new ResourceEntityResolver(this));
initBeanDefinitionReader(beanDefinitionReader);
// BeanDefiniton， BeanDefiniton
loadBeanDefinitions(beanDefinitionReader);
}
// BeanFactory， ， ，
protected void prepareBeanFactory(ConfigurableListableBeanFactory beanFactory) {
//
beanFactory.setBeanClassLoader(getClassLoader());
// ， BeanDefiniton
beanFactory.setBeanExpressionResolver(new StandardBeanExpressionResolver(beanFactory.getBeanClassLoader()));
beanFactory.addPropertyEditorRegistrar(new ResourceEditorRegistrar(this, getEnvironment()));
// ， spring bean
beanFactory.addBeanPostProcessor(new ApplicationContextAwareProcessor(this));
// ， @Resource @Autowired
beanFactory.ignoreDependencyInterface(EnvironmentAware.class);
beanFactory.ignoreDependencyInterface(EmbeddedValueResolverAware.class);
beanFactory.ignoreDependencyInterface(ResourceLoaderAware.class);
beanFactory.ignoreDependencyInterface(ApplicationEventPublisherAware.class);
beanFactory.ignoreDependencyInterface(MessageSourceAware.class);
beanFactory.ignoreDependencyInterface(ApplicationContextAware.class);
//
beanFactory.registerResolvableDependency(BeanFactory.class, beanFactory);
beanFactory.registerResolvableDependency(ResourceLoader.class, this);
beanFactory.registerResolvableDependency(ApplicationEventPublisher.class, this);
beanFactory.registerResolvableDependency(ApplicationContext.class, this);
//
beanFactory.addBeanPostProcessor(new ApplicationListenerDetector(this));
//
if (beanFactory.containsBean(LOAD_TIME_WEAVER_BEAN_NAME)) {
beanFactory.addBeanPostProcessor(new LoadTimeWeaverAwareProcessor(beanFactory));
beanFactory.setTempClassLoader(new ContextTypeMatchClassLoader(beanFactory.getBeanClassLoader()));
}
// ， registerSingleton ，
if (!beanFactory.containsLocalBean(ENVIRONMENT_BEAN_NAME)) {
beanFactory.registerSingleton(ENVIRONMENT_BEAN_NAME, getEnvironment());
}
if (!beanFactory.containsLocalBean(SYSTEM_PROPERTIES_BEAN_NAME)) {
beanFactory.registerSingleton(SYSTEM_PROPERTIES_BEAN_NAME, getEnvironment().getSystemProperties());
}
if (!beanFactory.containsLocalBean(SYSTEM_ENVIRONMENT_BEAN_NAME)) {
beanFactory.registerSingleton(SYSTEM_ENVIRONMENT_BEAN_NAME, getEnvironment().getSystemEnvironment());
}
}
// BeanFactory ，
protected void invokeBeanFactoryPostProcessors(ConfigurableListableBeanFactory beanFactory) {
// ，getBeanFactoryPostProcessors BeanFactoryPostProcessor
PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(beanFactory, getBeanFactoryPostProcessors());
}
// ，PostProcessorRegistrationDelegate
public static void invokeBeanFactoryPostProcessors(
ConfigurableListableBeanFactory beanFactory, List<BeanFactoryPostProcessor> beanFactoryPostProcessors) {
// Invoke BeanDefinitionRegistryPostProcessors first, if any.
Set<String> processedBeans = new HashSet<String>();
// beanFactory BeanDefinitionRegistry ，BeanDefinitionRegistry Bean (BeanDefintion)
if (beanFactory instanceof BeanDefinitionRegistry) {
BeanDefinitionRegistry registry = (BeanDefinitionRegistry) beanFactory;
// BeanFactoryPostProcessor
List<BeanFactoryPostProcessor> regularPostProcessors = new LinkedList<BeanFactoryPostProcessor>();
// BeanDefinitionRegistryPostProcessor
List<BeanDefinitionRegistryPostProcessor> registryPostProcessors =
new LinkedList<BeanDefinitionRegistryPostProcessor>();
// 。 BeanDefinitionRegistryPostProcessor
for (BeanFactoryPostProcessor postProcessor : beanFactoryPostProcessors) {
if (postProcessor instanceof BeanDefinitionRegistryPostProcessor) {
BeanDefinitionRegistryPostProcessor registryPostProcessor =
(BeanDefinitionRegistryPostProcessor) postProcessor;
// BeanDefinitionRegistryPostProcessor
registryPostProcessor.postProcessBeanDefinitionRegistry(registry);
//
registryPostProcessors.add(registryPostProcessor);
}
else {
// BeanFactoryPostProcessor ，
regularPostProcessors.add(postProcessor);
}
}
//--- beanFactory BeanDefinitionRegistryPostProcessor bean
String[] postProcessorNames =
beanFactory.getBeanNamesForType(BeanDefinitionRegistryPostProcessor.class, true, false);
// ---- BeanDefinitionRegistryPostProcessor
// PriorityOrdered BeanDefinitionRegistryPostProcessor
List<BeanDefinitionRegistryPostProcessor> priorityOrderedPostProcessors = new ArrayList<BeanDefinitionRegistryPostProcessor>();
// ， PriorityOrdered
for (String ppName : postProcessorNames) {
if (beanFactory.isTypeMatch(ppName, PriorityOrdered.class)) {
priorityOrderedPostProcessors.add(beanFactory.getBean(ppName, BeanDefinitionRegistryPostProcessor.class));
processedBeans.add(ppName);
}
}
//
OrderComparator.sort(priorityOrderedPostProcessors);
//
registryPostProcessors.addAll(priorityOrderedPostProcessors);
// PriorityOrdered BeanDefinitionRegistryPostProcessor
invokeBeanDefinitionRegistryPostProcessors(priorityOrderedPostProcessors, registry);
// ---- Orderd BeanDefinitionRegistryPostProcessor
postProcessorNames = beanFactory.getBeanNamesForType(BeanDefinitionRegistryPostProcessor.class, true, false);
List<BeanDefinitionRegistryPostProcessor> orderedPostProcessors = new ArrayList<BeanDefinitionRegistryPostProcessor>();
for (String ppName : postProcessorNames) {
if (!processedBeans.contains(ppName) && beanFactory.isTypeMatch(ppName, Ordered.class)) {
orderedPostProcessors.add(beanFactory.getBean(ppName, BeanDefinitionRegistryPostProcessor.class));
processedBeans.add(ppName);
}
}
OrderComparator.sort(orderedPostProcessors);
registryPostProcessors.addAll(orderedPostProcessors);
invokeBeanDefinitionRegistryPostProcessors(orderedPostProcessors, registry);
// ---- BeanDefinitionRegistryPostProcessor
boolean reiterate = true;
while (reiterate) {
reiterate = false;
postProcessorNames = beanFactory.getBeanNamesForType(BeanDefinitionRegistryPostProcessor.class, true, false);
for (String ppName : postProcessorNames) {
if (!processedBeans.contains(ppName)) {
BeanDefinitionRegistryPostProcessor pp = beanFactory.getBean(ppName, BeanDefinitionRegistryPostProcessor.class);
registryPostProcessors.add(pp);
processedBeans.add(ppName);
pp.postProcessBeanDefinitionRegistry(registry);
reiterate = true;
}
}
}
// BeanFactoryPostProcessor ， BeanDefitionRegistory
invokeBeanFactoryPostProcessors(registryPostProcessors, beanFactory);
invokeBeanFactoryPostProcessors(regularPostProcessors, beanFactory);
}
else {
// Invoke factory processors registered with the context instance.
invokeBeanFactoryPostProcessors(beanFactoryPostProcessors, beanFactory);
}
//--- BeanFactoryPostProcessor ，
String[] postProcessorNames =
beanFactory.getBeanNamesForType(BeanFactoryPostProcessor.class, true, false);
// Separate between BeanFactoryPostProcessors that implement PriorityOrdered,
// Ordered, and the rest.
List<BeanFactoryPostProcessor> priorityOrderedPostProcessors = new ArrayList<BeanFactoryPostProcessor>();
List<String> orderedPostProcessorNames = new ArrayList<String>();
List<String> nonOrderedPostProcessorNames = new ArrayList<String>();
for (String ppName : postProcessorNames) {
if (processedBeans.contains(ppName)) {
// skip - already processed in first phase above
}
else if (beanFactory.isTypeMatch(ppName, PriorityOrdered.class)) {
priorityOrderedPostProcessors.add(beanFactory.getBean(ppName, BeanFactoryPostProcessor.class));
}
else if (beanFactory.isTypeMatch(ppName, Ordered.class)) {
orderedPostProcessorNames.add(ppName);
}
else {
nonOrderedPostProcessorNames.add(ppName);
}
}
// First, invoke the BeanFactoryPostProcessors that implement PriorityOrdered.
OrderComparator.sort(priorityOrderedPostProcessors);
invokeBeanFactoryPostProcessors(priorityOrderedPostProcessors, beanFactory);
// Next, invoke the BeanFactoryPostProcessors that implement Ordered.
List<BeanFactoryPostProcessor> orderedPostProcessors = new ArrayList<BeanFactoryPostProcessor>();
for (String postProcessorName : orderedPostProcessorNames) {
orderedPostProcessors.add(beanFactory.getBean(postProcessorName, BeanFactoryPostProcessor.class));
}
OrderComparator.sort(orderedPostProcessors);
invokeBeanFactoryPostProcessors(orderedPostProcessors, beanFactory);
// Finally, invoke all other BeanFactoryPostProcessors.
List<BeanFactoryPostProcessor> nonOrderedPostProcessors = new ArrayList<BeanFactoryPostProcessor>();
for (String postProcessorName : nonOrderedPostProcessorNames) {
nonOrderedPostProcessors.add(beanFactory.getBean(postProcessorName, BeanFactoryPostProcessor.class));
}
invokeBeanFactoryPostProcessors(nonOrderedPostProcessors, beanFactory);
}
// PostProcessorRegistrationDelegate， ，
protected void registerBeanPostProcessors(ConfigurableListableBeanFactory beanFactory) {
PostProcessorRegistrationDelegate.registerBeanPostProcessors(beanFactory, this);
}
//PostProcessorRegistrationDelegate BeanPostProcessors
// beanFactory beanFactory， BeanPostProcessor ，applicationContext ，
public static void registerBeanPostProcessors(
ConfigurableListableBeanFactory beanFactory, AbstractApplicationContext applicationContext) {
// BeanFactoryProcessor ，
String[] postProcessorNames = beanFactory.getBeanNamesForType(BeanPostProcessor.class, true, false);
// BeanPostProcessor
int beanProcessorTargetCount = beanFactory.getBeanPostProcessorCount() + 1 + postProcessorNames.length;
beanFactory.addBeanPostProcessor(new BeanPostProcessorChecker(beanFactory, beanProcessorTargetCount));
// Separate between BeanPostProcessors that implement PriorityOrdered,
// Ordered, and the rest.
List<BeanPostProcessor> priorityOrderedPostProcessors = new ArrayList<BeanPostProcessor>();
List<BeanPostProcessor> internalPostProcessors = new ArrayList<BeanPostProcessor>();
List<String> orderedPostProcessorNames = new ArrayList<String>();
List<String> nonOrderedPostProcessorNames = new ArrayList<String>();
for (String ppName : postProcessorNames) {
if (beanFactory.isTypeMatch(ppName, PriorityOrdered.class)) {
BeanPostProcessor pp = beanFactory.getBean(ppName, BeanPostProcessor.class);
priorityOrderedPostProcessors.add(pp);
if (pp instanceof MergedBeanDefinitionPostProcessor) {
internalPostProcessors.add(pp);
}
}
else if (beanFactory.isTypeMatch(ppName, Ordered.class)) {
orderedPostProcessorNames.add(ppName);
}
else {
nonOrderedPostProcessorNames.add(ppName);
}
}
// First, register the BeanPostProcessors that implement PriorityOrdered.
OrderComparator.sort(priorityOrderedPostProcessors);
registerBeanPostProcessors(beanFactory, priorityOrderedPostProcessors);
// Next, register the BeanPostProcessors that implement Ordered.
List<BeanPostProcessor> orderedPostProcessors = new ArrayList<BeanPostProcessor>();
for (String ppName : orderedPostProcessorNames) {
BeanPostProcessor pp = beanFactory.getBean(ppName, BeanPostProcessor.class);
orderedPostProcessors.add(pp);
if (pp instanceof MergedBeanDefinitionPostProcessor) {
internalPostProcessors.add(pp);
}
}
OrderComparator.sort(orderedPostProcessors);
registerBeanPostProcessors(beanFactory, orderedPostProcessors);
// Now, register all regular BeanPostProcessors.
List<BeanPostProcessor> nonOrderedPostProcessors = new ArrayList<BeanPostProcessor>();
for (String ppName : nonOrderedPostProcessorNames) {
BeanPostProcessor pp = beanFactory.getBean(ppName, BeanPostProcessor.class);
nonOrderedPostProcessors.add(pp);
if (pp instanceof MergedBeanDefinitionPostProcessor) {
internalPostProcessors.add(pp);
}
}
registerBeanPostProcessors(beanFactory, nonOrderedPostProcessors);
// Finally, re-register all internal BeanPostProcessors.
OrderComparator.sort(internalPostProcessors);
registerBeanPostProcessors(beanFactory, internalPostProcessors);
beanFactory.addBeanPostProcessor(new ApplicationListenerDetector(applicationContext));
}