org.springframework.beans.factory.FactoryBean#isSingleton ( )源码实例Demo

/**
 * Obtain an object to expose from the given FactoryBean.
 * @param factory the FactoryBean instance
 * @param beanName the name of the bean
 * @param shouldPostProcess whether the bean is subject for post-processing
 * @return the object obtained from the FactoryBean
 * @throws BeanCreationException if FactoryBean object creation failed
 * @see org.springframework.beans.factory.FactoryBean#getObject()
 */
protected Object getObjectFromFactoryBean(FactoryBean<?> factory, String beanName, boolean shouldPostProcess) {
	if (factory.isSingleton() && containsSingleton(beanName)) {
		synchronized (getSingletonMutex()) {
			Object object = this.factoryBeanObjectCache.get(beanName);
			if (object == null) {
				object = doGetObjectFromFactoryBean(factory, beanName, shouldPostProcess);
				this.factoryBeanObjectCache.put(beanName, (object != null ? object : NULL_OBJECT));
			}
			return (object != NULL_OBJECT ? object : null);
		}
	}
	else {
		return doGetObjectFromFactoryBean(factory, beanName, shouldPostProcess);
	}
}
 

@Override
@SuppressWarnings("unchecked")
public <T> Map<String, T> getBeansOfType(@Nullable Class<T> type, boolean includeNonSingletons, boolean allowEagerInit)
		throws BeansException {

	boolean isFactoryType = (type != null && FactoryBean.class.isAssignableFrom(type));
	Map<String, T> matches = new LinkedHashMap<>();

	for (Map.Entry<String, Object> entry : this.beans.entrySet()) {
		String beanName = entry.getKey();
		Object beanInstance = entry.getValue();
		// Is bean a FactoryBean?
		if (beanInstance instanceof FactoryBean && !isFactoryType) {
			// Match object created by FactoryBean.
			FactoryBean<?> factory = (FactoryBean<?>) beanInstance;
			Class<?> objectType = factory.getObjectType();
			if ((includeNonSingletons || factory.isSingleton()) &&
					objectType != null && (type == null || type.isAssignableFrom(objectType))) {
				matches.put(beanName, getBean(beanName, type));
			}
		}
		else {
			if (type == null || type.isInstance(beanInstance)) {
				// If type to match is FactoryBean, return FactoryBean itself.
				// Else, return bean instance.
				if (isFactoryType) {
					beanName = FACTORY_BEAN_PREFIX + beanName;
				}
				matches.put(beanName, (T) beanInstance);
			}
		}
	}
	return matches;
}
 

@Override
public boolean isSingleton(String name) throws NoSuchBeanDefinitionException {
	String beanName = transformedBeanName(name);

	Object beanInstance = getSingleton(beanName, false);
	if (beanInstance != null) {
		if (beanInstance instanceof FactoryBean) {
			return (BeanFactoryUtils.isFactoryDereference(name) || ((FactoryBean<?>) beanInstance).isSingleton());
		}
		else {
			return !BeanFactoryUtils.isFactoryDereference(name);
		}
	}

	// No singleton instance found -> check bean definition.
	BeanFactory parentBeanFactory = getParentBeanFactory();
	if (parentBeanFactory != null && !containsBeanDefinition(beanName)) {
		// No bean definition found in this factory -> delegate to parent.
		return parentBeanFactory.isSingleton(originalBeanName(name));
	}

	RootBeanDefinition mbd = getMergedLocalBeanDefinition(beanName);

	// In case of FactoryBean, return singleton status of created object if not a dereference.
	if (mbd.isSingleton()) {
		if (isFactoryBean(beanName, mbd)) {
			if (BeanFactoryUtils.isFactoryDereference(name)) {
				return true;
			}
			FactoryBean<?> factoryBean = (FactoryBean<?>) getBean(FACTORY_BEAN_PREFIX + beanName);
			return factoryBean.isSingleton();
		}
		else {
			return !BeanFactoryUtils.isFactoryDereference(name);
		}
	}
	else {
		return false;
	}
}
 

@Override
public boolean isPrototype(String name) throws NoSuchBeanDefinitionException {
	String beanName = transformedBeanName(name);

	BeanFactory parentBeanFactory = getParentBeanFactory();
	if (parentBeanFactory != null && !containsBeanDefinition(beanName)) {
		// No bean definition found in this factory -> delegate to parent.
		return parentBeanFactory.isPrototype(originalBeanName(name));
	}

	RootBeanDefinition mbd = getMergedLocalBeanDefinition(beanName);
	if (mbd.isPrototype()) {
		// In case of FactoryBean, return singleton status of created object if not a dereference.
		return (!BeanFactoryUtils.isFactoryDereference(name) || isFactoryBean(beanName, mbd));
	}

	// Singleton or scoped - not a prototype.
	// However, FactoryBean may still produce a prototype object...
	if (BeanFactoryUtils.isFactoryDereference(name)) {
		return false;
	}
	if (isFactoryBean(beanName, mbd)) {
		final FactoryBean<?> fb = (FactoryBean<?>) getBean(FACTORY_BEAN_PREFIX + beanName);
		if (System.getSecurityManager() != null) {
			return AccessController.doPrivileged((PrivilegedAction<Boolean>) () ->
					((fb instanceof SmartFactoryBean && ((SmartFactoryBean<?>) fb).isPrototype()) || !fb.isSingleton()),
					getAccessControlContext());
		}
		else {
			return ((fb instanceof SmartFactoryBean && ((SmartFactoryBean<?>) fb).isPrototype()) ||
					!fb.isSingleton());
		}
	}
	else {
		return false;
	}
}
 

@Override
@SuppressWarnings("unchecked")
public <T> Map<String, T> getBeansOfType(@Nullable Class<T> type, boolean includeNonSingletons, boolean allowEagerInit)
		throws BeansException {

	boolean isFactoryType = (type != null && FactoryBean.class.isAssignableFrom(type));
	Map<String, T> matches = new LinkedHashMap<>();

	for (Map.Entry<String, Object> entry : this.beans.entrySet()) {
		String beanName = entry.getKey();
		Object beanInstance = entry.getValue();
		// Is bean a FactoryBean?
		if (beanInstance instanceof FactoryBean && !isFactoryType) {
			// Match object created by FactoryBean.
			FactoryBean<?> factory = (FactoryBean<?>) beanInstance;
			Class<?> objectType = factory.getObjectType();
			if ((includeNonSingletons || factory.isSingleton()) &&
					objectType != null && (type == null || type.isAssignableFrom(objectType))) {
				matches.put(beanName, getBean(beanName, type));
			}
		}
		else {
			if (type == null || type.isInstance(beanInstance)) {
				// If type to match is FactoryBean, return FactoryBean itself.
				// Else, return bean instance.
				if (isFactoryType) {
					beanName = FACTORY_BEAN_PREFIX + beanName;
				}
				matches.put(beanName, (T) beanInstance);
			}
		}
	}
	return matches;
}
 

@Override
public boolean isSingleton(String name) throws NoSuchBeanDefinitionException {
	String beanName = transformedBeanName(name);

	Object beanInstance = getSingleton(beanName, false);
	if (beanInstance != null) {
		if (beanInstance instanceof FactoryBean) {
			return (BeanFactoryUtils.isFactoryDereference(name) || ((FactoryBean<?>) beanInstance).isSingleton());
		}
		else {
			return !BeanFactoryUtils.isFactoryDereference(name);
		}
	}

	// No singleton instance found -> check bean definition.
	BeanFactory parentBeanFactory = getParentBeanFactory();
	if (parentBeanFactory != null && !containsBeanDefinition(beanName)) {
		// No bean definition found in this factory -> delegate to parent.
		return parentBeanFactory.isSingleton(originalBeanName(name));
	}

	RootBeanDefinition mbd = getMergedLocalBeanDefinition(beanName);

	// In case of FactoryBean, return singleton status of created object if not a dereference.
	if (mbd.isSingleton()) {
		if (isFactoryBean(beanName, mbd)) {
			if (BeanFactoryUtils.isFactoryDereference(name)) {
				return true;
			}
			FactoryBean<?> factoryBean = (FactoryBean<?>) getBean(FACTORY_BEAN_PREFIX + beanName);
			return factoryBean.isSingleton();
		}
		else {
			return !BeanFactoryUtils.isFactoryDereference(name);
		}
	}
	else {
		return false;
	}
}
 

@Override
public boolean isPrototype(String name) throws NoSuchBeanDefinitionException {
	String beanName = transformedBeanName(name);

	BeanFactory parentBeanFactory = getParentBeanFactory();
	if (parentBeanFactory != null && !containsBeanDefinition(beanName)) {
		// No bean definition found in this factory -> delegate to parent.
		return parentBeanFactory.isPrototype(originalBeanName(name));
	}

	RootBeanDefinition mbd = getMergedLocalBeanDefinition(beanName);
	if (mbd.isPrototype()) {
		// In case of FactoryBean, return singleton status of created object if not a dereference.
		return (!BeanFactoryUtils.isFactoryDereference(name) || isFactoryBean(beanName, mbd));
	}

	// Singleton or scoped - not a prototype.
	// However, FactoryBean may still produce a prototype object...
	if (BeanFactoryUtils.isFactoryDereference(name)) {
		return false;
	}
	if (isFactoryBean(beanName, mbd)) {
		final FactoryBean<?> fb = (FactoryBean<?>) getBean(FACTORY_BEAN_PREFIX + beanName);
		if (System.getSecurityManager() != null) {
			return AccessController.doPrivileged((PrivilegedAction<Boolean>) () ->
					((fb instanceof SmartFactoryBean && ((SmartFactoryBean<?>) fb).isPrototype()) || !fb.isSingleton()),
					getAccessControlContext());
		}
		else {
			return ((fb instanceof SmartFactoryBean && ((SmartFactoryBean<?>) fb).isPrototype()) ||
					!fb.isSingleton());
		}
	}
	else {
		return false;
	}
}
 

@Override
@SuppressWarnings("unchecked")
public <T> Map<String, T> getBeansOfType(Class<T> type, boolean includeNonSingletons, boolean allowEagerInit)
		throws BeansException {

	boolean isFactoryType = (type != null && FactoryBean.class.isAssignableFrom(type));
	Map<String, T> matches = new LinkedHashMap<String, T>();

	for (Map.Entry<String, Object> entry : this.beans.entrySet()) {
		String beanName = entry.getKey();
		Object beanInstance = entry.getValue();
		// Is bean a FactoryBean?
		if (beanInstance instanceof FactoryBean && !isFactoryType) {
			// Match object created by FactoryBean.
			FactoryBean<?> factory = (FactoryBean<?>) beanInstance;
			Class<?> objectType = factory.getObjectType();
			if ((includeNonSingletons || factory.isSingleton()) &&
					objectType != null && (type == null || type.isAssignableFrom(objectType))) {
				matches.put(beanName, getBean(beanName, type));
			}
		}
		else {
			if (type == null || type.isInstance(beanInstance)) {
				// If type to match is FactoryBean, return FactoryBean itself.
				// Else, return bean instance.
				if (isFactoryType) {
					beanName = FACTORY_BEAN_PREFIX + beanName;
				}
				matches.put(beanName, (T) beanInstance);
			}
		}
	}
	return matches;
}
 

@Override
@SuppressWarnings("unchecked")
public <T> Map<String, T> getBeansOfType(Class<T> type, boolean includeNonSingletons, boolean includeFactoryBeans)
		throws BeansException {

	boolean isFactoryType = (type != null && FactoryBean.class.isAssignableFrom(type));
	Map<String, T> matches = new HashMap<String, T>();

	for (Map.Entry<String, Object> entry : beans.entrySet()) {
		String beanName = entry.getKey();
		Object beanInstance = entry.getValue();
		// Is bean a FactoryBean?
		if (beanInstance instanceof FactoryBean && !isFactoryType) {
			if (includeFactoryBeans) {
				// Match object created by FactoryBean.
				FactoryBean<?> factory = (FactoryBean<?>) beanInstance;
				Class<?> objectType = factory.getObjectType();
				if ((includeNonSingletons || factory.isSingleton()) &&
						objectType != null && (type == null || type.isAssignableFrom(objectType))) {
					matches.put(beanName, getBean(beanName, type));
				}
			}
		}
		else {
			if (type == null || type.isInstance(beanInstance)) {
				// If type to match is FactoryBean, return FactoryBean itself.
				// Else, return bean instance.
				if (isFactoryType) {
					beanName = FACTORY_BEAN_PREFIX + beanName;
				}
				matches.put(beanName, (T) beanInstance);
			}
		}
	}
	return matches;
}
 

@Override
@SuppressWarnings("unchecked")
public <T> Map<String, T> getBeansOfType(Class<T> type, boolean includeNonSingletons, boolean allowEagerInit)
		throws BeansException {

	boolean isFactoryType = (type != null && FactoryBean.class.isAssignableFrom(type));
	Map<String, T> matches = new HashMap<String, T>();

	for (Map.Entry<String, Object> entry : this.beans.entrySet()) {
		String beanName = entry.getKey();
		Object beanInstance = entry.getValue();
		// Is bean a FactoryBean?
		if (beanInstance instanceof FactoryBean && !isFactoryType) {
			// Match object created by FactoryBean.
			FactoryBean<?> factory = (FactoryBean<?>) beanInstance;
			Class<?> objectType = factory.getObjectType();
			if ((includeNonSingletons || factory.isSingleton()) &&
					objectType != null && (type == null || type.isAssignableFrom(objectType))) {
				matches.put(beanName, getBean(beanName, type));
			}
		}
		else {
			if (type == null || type.isInstance(beanInstance)) {
				// If type to match is FactoryBean, return FactoryBean itself.
				// Else, return bean instance.
				if (isFactoryType) {
					beanName = FACTORY_BEAN_PREFIX + beanName;
				}
				matches.put(beanName, (T) beanInstance);
			}
		}
	}
	return matches;
}
 

@Override
public boolean isSingleton(String name) throws NoSuchBeanDefinitionException {
	String beanName = transformedBeanName(name);

	Object beanInstance = getSingleton(beanName, false);
	if (beanInstance != null) {
		if (beanInstance instanceof FactoryBean) {
			return (BeanFactoryUtils.isFactoryDereference(name) || ((FactoryBean<?>) beanInstance).isSingleton());
		}
		else {
			return !BeanFactoryUtils.isFactoryDereference(name);
		}
	}
	else if (containsSingleton(beanName)) {
		return true;
	}

	// No singleton instance found -> check bean definition.
	BeanFactory parentBeanFactory = getParentBeanFactory();
	if (parentBeanFactory != null && !containsBeanDefinition(beanName)) {
		// No bean definition found in this factory -> delegate to parent.
		return parentBeanFactory.isSingleton(originalBeanName(name));
	}

	RootBeanDefinition mbd = getMergedLocalBeanDefinition(beanName);

	// In case of FactoryBean, return singleton status of created object if not a dereference.
	if (mbd.isSingleton()) {
		if (isFactoryBean(beanName, mbd)) {
			if (BeanFactoryUtils.isFactoryDereference(name)) {
				return true;
			}
			FactoryBean<?> factoryBean = (FactoryBean<?>) getBean(FACTORY_BEAN_PREFIX + beanName);
			return factoryBean.isSingleton();
		}
		else {
			return !BeanFactoryUtils.isFactoryDereference(name);
		}
	}
	else {
		return false;
	}
}
 

@Override
public boolean isPrototype(String name) throws NoSuchBeanDefinitionException {
	String beanName = transformedBeanName(name);

	BeanFactory parentBeanFactory = getParentBeanFactory();
	if (parentBeanFactory != null && !containsBeanDefinition(beanName)) {
		// No bean definition found in this factory -> delegate to parent.
		return parentBeanFactory.isPrototype(originalBeanName(name));
	}

	RootBeanDefinition mbd = getMergedLocalBeanDefinition(beanName);
	if (mbd.isPrototype()) {
		// In case of FactoryBean, return singleton status of created object if not a dereference.
		return (!BeanFactoryUtils.isFactoryDereference(name) || isFactoryBean(beanName, mbd));
	}

	// Singleton or scoped - not a prototype.
	// However, FactoryBean may still produce a prototype object...
	if (BeanFactoryUtils.isFactoryDereference(name)) {
		return false;
	}
	if (isFactoryBean(beanName, mbd)) {
		final FactoryBean<?> fb = (FactoryBean<?>) getBean(FACTORY_BEAN_PREFIX + beanName);
		if (System.getSecurityManager() != null) {
			return AccessController.doPrivileged(new PrivilegedAction<Boolean>() {
				@Override
				public Boolean run() {
					return ((fb instanceof SmartFactoryBean && ((SmartFactoryBean<?>) fb).isPrototype()) ||
							!fb.isSingleton());
				}
			}, getAccessControlContext());
		}
		else {
			return ((fb instanceof SmartFactoryBean && ((SmartFactoryBean<?>) fb).isPrototype()) ||
					!fb.isSingleton());
		}
	}
	else {
		return false;
	}
}
 

@Override
public boolean isSingleton(String name) throws NoSuchBeanDefinitionException {
	String beanName = transformedBeanName(name);

	Object beanInstance = getSingleton(beanName, false);
	if (beanInstance != null) {
		if (beanInstance instanceof FactoryBean) {
			return (BeanFactoryUtils.isFactoryDereference(name) || ((FactoryBean<?>) beanInstance).isSingleton());
		}
		else {
			return !BeanFactoryUtils.isFactoryDereference(name);
		}
	}
	else if (containsSingleton(beanName)) {
		return true;
	}

	else {
		// No singleton instance found -> check bean definition.
		BeanFactory parentBeanFactory = getParentBeanFactory();
		if (parentBeanFactory != null && !containsBeanDefinition(beanName)) {
			// No bean definition found in this factory -> delegate to parent.
			return parentBeanFactory.isSingleton(originalBeanName(name));
		}

		RootBeanDefinition mbd = getMergedLocalBeanDefinition(beanName);

		// In case of FactoryBean, return singleton status of created object if not a dereference.
		if (mbd.isSingleton()) {
			if (isFactoryBean(beanName, mbd)) {
				if (BeanFactoryUtils.isFactoryDereference(name)) {
					return true;
				}
				FactoryBean<?> factoryBean = (FactoryBean<?>) getBean(FACTORY_BEAN_PREFIX + beanName);
				return factoryBean.isSingleton();
			}
			else {
				return !BeanFactoryUtils.isFactoryDereference(name);
			}
		}
		else {
			return false;
		}
	}
}
 

@Override
public boolean isPrototype(String name) throws NoSuchBeanDefinitionException {
	String beanName = transformedBeanName(name);

	BeanFactory parentBeanFactory = getParentBeanFactory();
	if (parentBeanFactory != null && !containsBeanDefinition(beanName)) {
		// No bean definition found in this factory -> delegate to parent.
		return parentBeanFactory.isPrototype(originalBeanName(name));
	}

	RootBeanDefinition mbd = getMergedLocalBeanDefinition(beanName);
	if (mbd.isPrototype()) {
		// In case of FactoryBean, return singleton status of created object if not a dereference.
		return (!BeanFactoryUtils.isFactoryDereference(name) || isFactoryBean(beanName, mbd));
	}
	else {
		// Singleton or scoped - not a prototype.
		// However, FactoryBean may still produce a prototype object...
		if (BeanFactoryUtils.isFactoryDereference(name)) {
			return false;
		}
		if (isFactoryBean(beanName, mbd)) {
			final FactoryBean<?> factoryBean = (FactoryBean<?>) getBean(FACTORY_BEAN_PREFIX + beanName);
			if (System.getSecurityManager() != null) {
				return AccessController.doPrivileged(new PrivilegedAction<Boolean>() {
					@Override
					public Boolean run() {
						return ((factoryBean instanceof SmartFactoryBean && ((SmartFactoryBean<?>) factoryBean).isPrototype()) ||
								!factoryBean.isSingleton());
					}
				}, getAccessControlContext());
			}
			else {
				return ((factoryBean instanceof SmartFactoryBean && ((SmartFactoryBean<?>) factoryBean).isPrototype()) ||
						!factoryBean.isSingleton());
			}
		}
		else {
			return false;
		}
	}
}
 

@Override
public boolean isSingleton(String name) throws NoSuchBeanDefinitionException {
	String beanName = transformedBeanName(name);

	Object beanInstance = getSingleton(beanName, false);
	if (beanInstance != null) {
		if (beanInstance instanceof FactoryBean) {
			return (BeanFactoryUtils.isFactoryDereference(name) || ((FactoryBean<?>) beanInstance).isSingleton());
		}
		else {
			return !BeanFactoryUtils.isFactoryDereference(name);
		}
	}
	else if (containsSingleton(beanName)) {
		return true;
	}

	else {
		// No singleton instance found -> check bean definition.
		BeanFactory parentBeanFactory = getParentBeanFactory();
		if (parentBeanFactory != null && !containsBeanDefinition(beanName)) {
			// No bean definition found in this factory -> delegate to parent.
			return parentBeanFactory.isSingleton(originalBeanName(name));
		}

		RootBeanDefinition mbd = getMergedLocalBeanDefinition(beanName);

		// In case of FactoryBean, return singleton status of created object if not a dereference.
		if (mbd.isSingleton()) {
			if (isFactoryBean(beanName, mbd)) {
				if (BeanFactoryUtils.isFactoryDereference(name)) {
					return true;
				}
				FactoryBean<?> factoryBean = (FactoryBean<?>) getBean(FACTORY_BEAN_PREFIX + beanName);
				return factoryBean.isSingleton();
			}
			else {
				return !BeanFactoryUtils.isFactoryDereference(name);
			}
		}
		else {
			return false;
		}
	}
}
 

@Override
public boolean isPrototype(String name) throws NoSuchBeanDefinitionException {
	String beanName = transformedBeanName(name);

	BeanFactory parentBeanFactory = getParentBeanFactory();
	if (parentBeanFactory != null && !containsBeanDefinition(beanName)) {
		// No bean definition found in this factory -> delegate to parent.
		return parentBeanFactory.isPrototype(originalBeanName(name));
	}

	RootBeanDefinition mbd = getMergedLocalBeanDefinition(beanName);
	if (mbd.isPrototype()) {
		// In case of FactoryBean, return singleton status of created object if not a dereference.
		return (!BeanFactoryUtils.isFactoryDereference(name) || isFactoryBean(beanName, mbd));
	}
	else {
		// Singleton or scoped - not a prototype.
		// However, FactoryBean may still produce a prototype object...
		if (BeanFactoryUtils.isFactoryDereference(name)) {
			return false;
		}
		if (isFactoryBean(beanName, mbd)) {
			final FactoryBean<?> factoryBean = (FactoryBean<?>) getBean(FACTORY_BEAN_PREFIX + beanName);
			if (System.getSecurityManager() != null) {
				return AccessController.doPrivileged(new PrivilegedAction<Boolean>() {
					@Override
					public Boolean run() {
						return ((factoryBean instanceof SmartFactoryBean && ((SmartFactoryBean<?>) factoryBean).isPrototype()) ||
								!factoryBean.isSingleton());
					}
				}, getAccessControlContext());
			}
			else {
				return ((factoryBean instanceof SmartFactoryBean && ((SmartFactoryBean<?>) factoryBean).isPrototype()) ||
						!factoryBean.isSingleton());
			}
		}
		else {
			return false;
		}
	}
}