下面列出了org.springframework.beans.factory.config.BeanDefinition#isSingleton ( ) 实例代码，或者点击链接到github查看源代码，也可以在右侧发表评论。
private static void parseSingleRef(String property, Element element, BeanDefinition bd,
ParserContext parserContext) {
String value = element.getAttribute(property);
if (StringUtils.isNotBlank(value)) {
if (parserContext.getRegistry().containsBeanDefinition(value)) {
BeanDefinition refBean = parserContext.getRegistry().getBeanDefinition(value);
if (!refBean.isSingleton()) {
throw new IllegalStateException("The exported service ref " + value + " must be singleton! Please set the " + value
+ " bean scope to singleton, eg: <bean id=\"" + value + "\" scope=\"singleton\" ...>");
}
}
bd.getPropertyValues().addPropertyValue(property, new RuntimeBeanReference(value));
}
}
@Override
@Nullable
public Class<?> predictBeanType(Class<?> beanClass, String beanName) {
// We only apply special treatment to ScriptFactory implementations here.
if (!ScriptFactory.class.isAssignableFrom(beanClass)) {
return null;
}
Assert.state(this.beanFactory != null, "No BeanFactory set");
BeanDefinition bd = this.beanFactory.getMergedBeanDefinition(beanName);
try {
String scriptFactoryBeanName = SCRIPT_FACTORY_NAME_PREFIX + beanName;
String scriptedObjectBeanName = SCRIPTED_OBJECT_NAME_PREFIX + beanName;
prepareScriptBeans(bd, scriptFactoryBeanName, scriptedObjectBeanName);
ScriptFactory scriptFactory = this.scriptBeanFactory.getBean(scriptFactoryBeanName, ScriptFactory.class);
ScriptSource scriptSource = getScriptSource(scriptFactoryBeanName, scriptFactory.getScriptSourceLocator());
Class<?>[] interfaces = scriptFactory.getScriptInterfaces();
Class<?> scriptedType = scriptFactory.getScriptedObjectType(scriptSource);
if (scriptedType != null) {
return scriptedType;
}
else if (!ObjectUtils.isEmpty(interfaces)) {
return (interfaces.length == 1 ? interfaces[0] : createCompositeInterface(interfaces));
}
else {
if (bd.isSingleton()) {
return this.scriptBeanFactory.getBean(scriptedObjectBeanName).getClass();
}
}
}
catch (Exception ex) {
if (ex instanceof BeanCreationException &&
((BeanCreationException) ex).getMostSpecificCause() instanceof BeanCurrentlyInCreationException) {
if (logger.isTraceEnabled()) {
logger.trace("Could not determine scripted object type for bean '" + beanName + "': " +
ex.getMessage());
}
}
else {
if (logger.isDebugEnabled()) {
logger.debug("Could not determine scripted object type for bean '" + beanName + "'", ex);
}
}
}
return null;
}
/**
* Return a RootBeanDefinition for the given bean, by merging with the
* parent if the given bean's definition is a child bean definition.
* @param beanName the name of the bean definition
* @param bd the original bean definition (Root/ChildBeanDefinition)
* @param containingBd the containing bean definition in case of inner bean,
* or {@code null} in case of a top-level bean
* @return a (potentially merged) RootBeanDefinition for the given bean
* @throws BeanDefinitionStoreException in case of an invalid bean definition
*/
protected RootBeanDefinition getMergedBeanDefinition(
String beanName, BeanDefinition bd, @Nullable BeanDefinition containingBd)
throws BeanDefinitionStoreException {
synchronized (this.mergedBeanDefinitions) {
RootBeanDefinition mbd = null;
// Check with full lock now in order to enforce the same merged instance.
if (containingBd == null) {
mbd = this.mergedBeanDefinitions.get(beanName);
}
if (mbd == null) {
if (bd.getParentName() == null) {
// Use copy of given root bean definition.
if (bd instanceof RootBeanDefinition) {
mbd = ((RootBeanDefinition) bd).cloneBeanDefinition();
}
else {
mbd = new RootBeanDefinition(bd);
}
}
else {
// Child bean definition: needs to be merged with parent.
BeanDefinition pbd;
try {
String parentBeanName = transformedBeanName(bd.getParentName());
if (!beanName.equals(parentBeanName)) {
pbd = getMergedBeanDefinition(parentBeanName);
}
else {
BeanFactory parent = getParentBeanFactory();
if (parent instanceof ConfigurableBeanFactory) {
pbd = ((ConfigurableBeanFactory) parent).getMergedBeanDefinition(parentBeanName);
}
else {
throw new NoSuchBeanDefinitionException(parentBeanName,
"Parent name '" + parentBeanName + "' is equal to bean name '" + beanName +
"': cannot be resolved without an AbstractBeanFactory parent");
}
}
}
catch (NoSuchBeanDefinitionException ex) {
throw new BeanDefinitionStoreException(bd.getResourceDescription(), beanName,
"Could not resolve parent bean definition '" + bd.getParentName() + "'", ex);
}
// Deep copy with overridden values.
mbd = new RootBeanDefinition(pbd);
mbd.overrideFrom(bd);
}
// Set default singleton scope, if not configured before.
if (!StringUtils.hasLength(mbd.getScope())) {
mbd.setScope(RootBeanDefinition.SCOPE_SINGLETON);
}
// A bean contained in a non-singleton bean cannot be a singleton itself.
// Let's correct this on the fly here, since this might be the result of
// parent-child merging for the outer bean, in which case the original inner bean
// definition will not have inherited the merged outer bean's singleton status.
if (containingBd != null && !containingBd.isSingleton() && mbd.isSingleton()) {
mbd.setScope(containingBd.getScope());
}
// Cache the merged bean definition for the time being
// (it might still get re-merged later on in order to pick up metadata changes)
if (containingBd == null && isCacheBeanMetadata()) {
this.mergedBeanDefinitions.put(beanName, mbd);
}
}
return mbd;
}
}
@Override
@Nullable
public Class<?> predictBeanType(Class<?> beanClass, String beanName) {
// We only apply special treatment to ScriptFactory implementations here.
if (!ScriptFactory.class.isAssignableFrom(beanClass)) {
return null;
}
Assert.state(this.beanFactory != null, "No BeanFactory set");
BeanDefinition bd = this.beanFactory.getMergedBeanDefinition(beanName);
try {
String scriptFactoryBeanName = SCRIPT_FACTORY_NAME_PREFIX + beanName;
String scriptedObjectBeanName = SCRIPTED_OBJECT_NAME_PREFIX + beanName;
prepareScriptBeans(bd, scriptFactoryBeanName, scriptedObjectBeanName);
ScriptFactory scriptFactory = this.scriptBeanFactory.getBean(scriptFactoryBeanName, ScriptFactory.class);
ScriptSource scriptSource = getScriptSource(scriptFactoryBeanName, scriptFactory.getScriptSourceLocator());
Class<?>[] interfaces = scriptFactory.getScriptInterfaces();
Class<?> scriptedType = scriptFactory.getScriptedObjectType(scriptSource);
if (scriptedType != null) {
return scriptedType;
}
else if (!ObjectUtils.isEmpty(interfaces)) {
return (interfaces.length == 1 ? interfaces[0] : createCompositeInterface(interfaces));
}
else {
if (bd.isSingleton()) {
return this.scriptBeanFactory.getBean(scriptedObjectBeanName).getClass();
}
}
}
catch (Exception ex) {
if (ex instanceof BeanCreationException &&
((BeanCreationException) ex).getMostSpecificCause() instanceof BeanCurrentlyInCreationException) {
if (logger.isTraceEnabled()) {
logger.trace("Could not determine scripted object type for bean '" + beanName + "': " +
ex.getMessage());
}
}
else {
if (logger.isDebugEnabled()) {
logger.debug("Could not determine scripted object type for bean '" + beanName + "'", ex);
}
}
}
return null;
}
/**
* Return a RootBeanDefinition for the given bean, by merging with the
* parent if the given bean's definition is a child bean definition.
* @param beanName the name of the bean definition
* @param bd the original bean definition (Root/ChildBeanDefinition)
* @param containingBd the containing bean definition in case of inner bean,
* or {@code null} in case of a top-level bean
* @return a (potentially merged) RootBeanDefinition for the given bean
* @throws BeanDefinitionStoreException in case of an invalid bean definition
*/
protected RootBeanDefinition getMergedBeanDefinition(
String beanName, BeanDefinition bd, @Nullable BeanDefinition containingBd)
throws BeanDefinitionStoreException {
synchronized (this.mergedBeanDefinitions) {
RootBeanDefinition mbd = null;
// Check with full lock now in order to enforce the same merged instance.
if (containingBd == null) {
mbd = this.mergedBeanDefinitions.get(beanName);
}
if (mbd == null) {
if (bd.getParentName() == null) {
// Use copy of given root bean definition.
if (bd instanceof RootBeanDefinition) {
mbd = ((RootBeanDefinition) bd).cloneBeanDefinition();
}
else {
mbd = new RootBeanDefinition(bd);
}
}
else {
// Child bean definition: needs to be merged with parent.
BeanDefinition pbd;
try {
String parentBeanName = transformedBeanName(bd.getParentName());
if (!beanName.equals(parentBeanName)) {
pbd = getMergedBeanDefinition(parentBeanName);
}
else {
BeanFactory parent = getParentBeanFactory();
if (parent instanceof ConfigurableBeanFactory) {
pbd = ((ConfigurableBeanFactory) parent).getMergedBeanDefinition(parentBeanName);
}
else {
throw new NoSuchBeanDefinitionException(parentBeanName,
"Parent name '" + parentBeanName + "' is equal to bean name '" + beanName +
"': cannot be resolved without an AbstractBeanFactory parent");
}
}
}
catch (NoSuchBeanDefinitionException ex) {
throw new BeanDefinitionStoreException(bd.getResourceDescription(), beanName,
"Could not resolve parent bean definition '" + bd.getParentName() + "'", ex);
}
// Deep copy with overridden values.
mbd = new RootBeanDefinition(pbd);
mbd.overrideFrom(bd);
}
// Set default singleton scope, if not configured before.
if (!StringUtils.hasLength(mbd.getScope())) {
mbd.setScope(RootBeanDefinition.SCOPE_SINGLETON);
}
// A bean contained in a non-singleton bean cannot be a singleton itself.
// Let's correct this on the fly here, since this might be the result of
// parent-child merging for the outer bean, in which case the original inner bean
// definition will not have inherited the merged outer bean's singleton status.
if (containingBd != null && !containingBd.isSingleton() && mbd.isSingleton()) {
mbd.setScope(containingBd.getScope());
}
// Cache the merged bean definition for the time being
// (it might still get re-merged later on in order to pick up metadata changes)
if (containingBd == null && isCacheBeanMetadata()) {
this.mergedBeanDefinitions.put(beanName, mbd);
}
}
return mbd;
}
}
@Override
public Class<?> predictBeanType(Class<?> beanClass, String beanName) {
// We only apply special treatment to ScriptFactory implementations here.
if (!ScriptFactory.class.isAssignableFrom(beanClass)) {
return null;
}
BeanDefinition bd = this.beanFactory.getMergedBeanDefinition(beanName);
try {
String scriptFactoryBeanName = SCRIPT_FACTORY_NAME_PREFIX + beanName;
String scriptedObjectBeanName = SCRIPTED_OBJECT_NAME_PREFIX + beanName;
prepareScriptBeans(bd, scriptFactoryBeanName, scriptedObjectBeanName);
ScriptFactory scriptFactory = this.scriptBeanFactory.getBean(scriptFactoryBeanName, ScriptFactory.class);
ScriptSource scriptSource = getScriptSource(scriptFactoryBeanName, scriptFactory.getScriptSourceLocator());
Class<?>[] interfaces = scriptFactory.getScriptInterfaces();
Class<?> scriptedType = scriptFactory.getScriptedObjectType(scriptSource);
if (scriptedType != null) {
return scriptedType;
}
else if (!ObjectUtils.isEmpty(interfaces)) {
return (interfaces.length == 1 ? interfaces[0] : createCompositeInterface(interfaces));
}
else {
if (bd.isSingleton()) {
Object bean = this.scriptBeanFactory.getBean(scriptedObjectBeanName);
if (bean != null) {
return bean.getClass();
}
}
}
}
catch (Exception ex) {
if (ex instanceof BeanCreationException &&
((BeanCreationException) ex).getMostSpecificCause() instanceof BeanCurrentlyInCreationException) {
if (logger.isTraceEnabled()) {
logger.trace("Could not determine scripted object type for bean '" + beanName + "': "
+ ex.getMessage());
}
}
else {
if (logger.isDebugEnabled()) {
logger.debug("Could not determine scripted object type for bean '" + beanName + "'", ex);
}
}
}
return null;
}
/**
* Return a RootBeanDefinition for the given bean, by merging with the
* parent if the given bean's definition is a child bean definition.
* @param beanName the name of the bean definition
* @param bd the original bean definition (Root/ChildBeanDefinition)
* @param containingBd the containing bean definition in case of inner bean,
* or {@code null} in case of a top-level bean
* @return a (potentially merged) RootBeanDefinition for the given bean
* @throws BeanDefinitionStoreException in case of an invalid bean definition
*/
protected RootBeanDefinition getMergedBeanDefinition(
String beanName, BeanDefinition bd, BeanDefinition containingBd)
throws BeanDefinitionStoreException {
synchronized (this.mergedBeanDefinitions) {
RootBeanDefinition mbd = null;
// Check with full lock now in order to enforce the same merged instance.
if (containingBd == null) {
mbd = this.mergedBeanDefinitions.get(beanName);
}
if (mbd == null) {
if (bd.getParentName() == null) {
// Use copy of given root bean definition.
if (bd instanceof RootBeanDefinition) {
mbd = ((RootBeanDefinition) bd).cloneBeanDefinition();
}
else {
mbd = new RootBeanDefinition(bd);
}
}
else {
// Child bean definition: needs to be merged with parent.
BeanDefinition pbd;
try {
String parentBeanName = transformedBeanName(bd.getParentName());
if (!beanName.equals(parentBeanName)) {
pbd = getMergedBeanDefinition(parentBeanName);
}
else {
BeanFactory parent = getParentBeanFactory();
if (parent instanceof ConfigurableBeanFactory) {
pbd = ((ConfigurableBeanFactory) parent).getMergedBeanDefinition(parentBeanName);
}
else {
throw new NoSuchBeanDefinitionException(parentBeanName,
"Parent name '" + parentBeanName + "' is equal to bean name '" + beanName +
"': cannot be resolved without an AbstractBeanFactory parent");
}
}
}
catch (NoSuchBeanDefinitionException ex) {
throw new BeanDefinitionStoreException(bd.getResourceDescription(), beanName,
"Could not resolve parent bean definition '" + bd.getParentName() + "'", ex);
}
// Deep copy with overridden values.
mbd = new RootBeanDefinition(pbd);
mbd.overrideFrom(bd);
}
// Set default singleton scope, if not configured before.
if (!StringUtils.hasLength(mbd.getScope())) {
mbd.setScope(RootBeanDefinition.SCOPE_SINGLETON);
}
// A bean contained in a non-singleton bean cannot be a singleton itself.
// Let's correct this on the fly here, since this might be the result of
// parent-child merging for the outer bean, in which case the original inner bean
// definition will not have inherited the merged outer bean's singleton status.
if (containingBd != null && !containingBd.isSingleton() && mbd.isSingleton()) {
mbd.setScope(containingBd.getScope());
}
// Cache the merged bean definition for the time being
// (it might still get re-merged later on in order to pick up metadata changes)
if (containingBd == null && isCacheBeanMetadata()) {
this.mergedBeanDefinitions.put(beanName, mbd);
}
}
return mbd;
}
}
/**
* Return a RootBeanDefinition for the given bean, by merging with the
* parent if the given bean's definition is a child bean definition.
* @param beanName the name of the bean definition
* @param bd the original bean definition (Root/ChildBeanDefinition)
* @param containingBd the containing bean definition in case of inner bean,
* or {@code null} in case of a top-level bean
* @return a (potentially merged) RootBeanDefinition for the given bean
* @throws BeanDefinitionStoreException in case of an invalid bean definition
*/
protected RootBeanDefinition getMergedBeanDefinition(
String beanName, BeanDefinition bd, BeanDefinition containingBd)
throws BeanDefinitionStoreException {
synchronized (this.mergedBeanDefinitions) {
RootBeanDefinition mbd = null;
// Check with full lock now in order to enforce the same merged instance.
if (containingBd == null) {
mbd = this.mergedBeanDefinitions.get(beanName);
}
if (mbd == null) {
if (bd.getParentName() == null) {
// Use copy of given root bean definition.
if (bd instanceof RootBeanDefinition) {
mbd = ((RootBeanDefinition) bd).cloneBeanDefinition();
}
else {
mbd = new RootBeanDefinition(bd);
}
}
else {
// Child bean definition: needs to be merged with parent.
BeanDefinition pbd;
try {
String parentBeanName = transformedBeanName(bd.getParentName());
if (!beanName.equals(parentBeanName)) {
pbd = getMergedBeanDefinition(parentBeanName);
}
else {
if (getParentBeanFactory() instanceof ConfigurableBeanFactory) {
pbd = ((ConfigurableBeanFactory) getParentBeanFactory()).getMergedBeanDefinition(parentBeanName);
}
else {
throw new NoSuchBeanDefinitionException(bd.getParentName(),
"Parent name '" + bd.getParentName() + "' is equal to bean name '" + beanName +
"': cannot be resolved without an AbstractBeanFactory parent");
}
}
}
catch (NoSuchBeanDefinitionException ex) {
throw new BeanDefinitionStoreException(bd.getResourceDescription(), beanName,
"Could not resolve parent bean definition '" + bd.getParentName() + "'", ex);
}
// Deep copy with overridden values.
mbd = new RootBeanDefinition(pbd);
mbd.overrideFrom(bd);
}
// Set default singleton scope, if not configured before.
if (!StringUtils.hasLength(mbd.getScope())) {
mbd.setScope(RootBeanDefinition.SCOPE_SINGLETON);
}
// A bean contained in a non-singleton bean cannot be a singleton itself.
// Let's correct this on the fly here, since this might be the result of
// parent-child merging for the outer bean, in which case the original inner bean
// definition will not have inherited the merged outer bean's singleton status.
if (containingBd != null && !containingBd.isSingleton() && mbd.isSingleton()) {
mbd.setScope(containingBd.getScope());
}
// Only cache the merged bean definition if we're already about to create an
// instance of the bean, or at least have already created an instance before.
if (containingBd == null && isCacheBeanMetadata() && isBeanEligibleForMetadataCaching(beanName)) {
this.mergedBeanDefinitions.put(beanName, mbd);
}
}
return mbd;
}
}
@Override
public Class<?> predictBeanType(Class<?> beanClass, String beanName) {
// We only apply special treatment to ScriptFactory implementations here.
if (!ScriptFactory.class.isAssignableFrom(beanClass)) {
return null;
}
BeanDefinition bd = this.beanFactory.getMergedBeanDefinition(beanName);
try {
String scriptFactoryBeanName = SCRIPT_FACTORY_NAME_PREFIX + beanName;
String scriptedObjectBeanName = SCRIPTED_OBJECT_NAME_PREFIX + beanName;
prepareScriptBeans(bd, scriptFactoryBeanName, scriptedObjectBeanName);
ScriptFactory scriptFactory = this.scriptBeanFactory.getBean(scriptFactoryBeanName, ScriptFactory.class);
ScriptSource scriptSource = getScriptSource(scriptFactoryBeanName, scriptFactory.getScriptSourceLocator());
Class<?>[] interfaces = scriptFactory.getScriptInterfaces();
Class<?> scriptedType = scriptFactory.getScriptedObjectType(scriptSource);
if (scriptedType != null) {
return scriptedType;
}
else if (!ObjectUtils.isEmpty(interfaces)) {
return (interfaces.length == 1 ? interfaces[0] : createCompositeInterface(interfaces));
}
else {
if (bd.isSingleton()) {
Object bean = this.scriptBeanFactory.getBean(scriptedObjectBeanName);
if (bean != null) {
return bean.getClass();
}
}
}
}
catch (Exception ex) {
if (ex instanceof BeanCreationException
&& ((BeanCreationException) ex).getMostSpecificCause() instanceof BeanCurrentlyInCreationException) {
if (logger.isTraceEnabled()) {
logger.trace("Could not determine scripted object type for bean '" + beanName + "': "
+ ex.getMessage());
}
}
else {
if (logger.isDebugEnabled()) {
logger.debug("Could not determine scripted object type for bean '" + beanName + "'", ex);
}
}
}
return null;
}
/**
* Return a RootBeanDefinition for the given bean, by merging with the
* parent if the given bean's definition is a child bean definition.
* @param beanName the name of the bean definition
* @param bd the original bean definition (Root/ChildBeanDefinition)
* @param containingBd the containing bean definition in case of inner bean,
* or {@code null} in case of a top-level bean
* @return a (potentially merged) RootBeanDefinition for the given bean
* @throws BeanDefinitionStoreException in case of an invalid bean definition
*/
protected RootBeanDefinition getMergedBeanDefinition(
String beanName, BeanDefinition bd, BeanDefinition containingBd)
throws BeanDefinitionStoreException {
synchronized (this.mergedBeanDefinitions) {
RootBeanDefinition mbd = null;
// Check with full lock now in order to enforce the same merged instance.
if (containingBd == null) {
mbd = this.mergedBeanDefinitions.get(beanName);
}
if (mbd == null) {
if (bd.getParentName() == null) {
// Use copy of given root bean definition.
if (bd instanceof RootBeanDefinition) {
mbd = ((RootBeanDefinition) bd).cloneBeanDefinition();
}
else {
mbd = new RootBeanDefinition(bd);
}
}
else {
// Child bean definition: needs to be merged with parent.
BeanDefinition pbd;
try {
String parentBeanName = transformedBeanName(bd.getParentName());
if (!beanName.equals(parentBeanName)) {
pbd = getMergedBeanDefinition(parentBeanName);
}
else {
if (getParentBeanFactory() instanceof ConfigurableBeanFactory) {
pbd = ((ConfigurableBeanFactory) getParentBeanFactory()).getMergedBeanDefinition(parentBeanName);
}
else {
throw new NoSuchBeanDefinitionException(bd.getParentName(),
"Parent name '" + bd.getParentName() + "' is equal to bean name '" + beanName +
"': cannot be resolved without an AbstractBeanFactory parent");
}
}
}
catch (NoSuchBeanDefinitionException ex) {
throw new BeanDefinitionStoreException(bd.getResourceDescription(), beanName,
"Could not resolve parent bean definition '" + bd.getParentName() + "'", ex);
}
// Deep copy with overridden values.
mbd = new RootBeanDefinition(pbd);
mbd.overrideFrom(bd);
}
// Set default singleton scope, if not configured before.
if (!StringUtils.hasLength(mbd.getScope())) {
mbd.setScope(RootBeanDefinition.SCOPE_SINGLETON);
}
// A bean contained in a non-singleton bean cannot be a singleton itself.
// Let's correct this on the fly here, since this might be the result of
// parent-child merging for the outer bean, in which case the original inner bean
// definition will not have inherited the merged outer bean's singleton status.
if (containingBd != null && !containingBd.isSingleton() && mbd.isSingleton()) {
mbd.setScope(containingBd.getScope());
}
// Only cache the merged bean definition if we're already about to create an
// instance of the bean, or at least have already created an instance before.
if (containingBd == null && isCacheBeanMetadata()) {
this.mergedBeanDefinitions.put(beanName, mbd);
}
}
return mbd;
}
}