import org.springframework.core.convert.ConversionService; import org.springframework.lang.Nullable; import org.springframework.util.*; public abstract class AbstractBeanFactory extends FactoryBeanRegistrySupport implements ConfigurableBeanFactory { /** Parent bean factory, for bean inheritance support */ @Nullable private BeanFactory parentBeanFactory; /** ClassLoader to resolve bean class names with, if necessary */ @Nullable private ClassLoader beanClassLoader = ClassUtils.getDefaultClassLoader(); /** ClassLoader to temporarily resolve bean class names with, if necessary */ @Nullable private ClassLoader tempClassLoader; /** Whether to cache bean metadata or rather reobtain it for every access */ private boolean cacheBeanMetadata = true; /** Resolution strategy for expressions in bean definition values */ @Nullable private BeanExpressionResolver beanExpressionResolver; /** Spring ConversionService to use instead of PropertyEditors */ @Nullable private ConversionService conversionService; /** Custom PropertyEditorRegistrars to apply to the beans of this factory */ private final Set<PropertyEditorRegistrar> propertyEditorRegistrars = new LinkedHashSet<>(4); /** Custom PropertyEditors to apply to the beans of this factory */ private final Map<Class<?>, Class<? extends PropertyEditor>> customEditors = new HashMap<>(4); /** A custom TypeConverter to use, overriding the default PropertyEditor mechanism */ @Nullable private TypeConverter typeConverter; /** String resolvers to apply e.g. to annotation attribute values */ private final List<StringValueResolver> embeddedValueResolvers = new LinkedList<>(); /** BeanPostProcessors to apply in createBean */ private final List<BeanPostProcessor> beanPostProcessors = new ArrayList<>(); /** Indicates whether any InstantiationAwareBeanPostProcessors have been registered */ private boolean hasInstantiationAwareBeanPostProcessors; /** Indicates whether any DestructionAwareBeanPostProcessors have been registered */ private boolean hasDestructionAwareBeanPostProcessors; /** Map from scope identifier String to corresponding Scope */ private final Map<String, Scope> scopes = new LinkedHashMap<>(8); /** Security context used when running with a SecurityManager */ @Nullable private SecurityContextProvider securityContextProvider; /** Map from bean name to merged RootBeanDefinition */ private final Map<String, RootBeanDefinition> mergedBeanDefinitions = new ConcurrentHashMap<>(256); /** Names of beans that have already been created at least once */ private final Set<String> alreadyCreated = Collections.newSetFromMap(new ConcurrentHashMap<>(256)); /** Names of beans that are currently in creation */ private final ThreadLocal<Object> prototypesCurrentlyInCreation = new NamedThreadLocal<>("Prototype beans currently in creation"); /** * Create a new AbstractBeanFactory. */ public AbstractBeanFactory() { } /** * Create a new AbstractBeanFactory with the given parent. * @param parentBeanFactory parent bean factory, or {@code null} if none * @see #getBean */ public AbstractBeanFactory(@Nullable BeanFactory parentBeanFactory) { this.parentBeanFactory = parentBeanFactory; } // Implementation of BeanFactory interface @Override public Object getBean(String name) throws BeansException { return doGetBean(name, null, null, false); } @Override public <T> T getBean(String name, @Nullable Class<T> requiredType) throws BeansException { return doGetBean(name, requiredType, null, false); } @Override public Object getBean(String name, Object... args) throws BeansException { return doGetBean(name, null, args, false); } /** * Return an instance, which may be shared or independent, of the specified bean. * @param name the name of the bean to retrieve * @param requiredType the required type of the bean to retrieve * @param args arguments to use when creating a bean instance using explicit * arguments (only applied when creating a new instance) * @return an instance of the bean * @throws BeansException if the bean could not be created */ public <T> T getBean(String name, @Nullable Class<T> requiredType, @Nullable Object... args) throws BeansException { return doGetBean(name, requiredType, args, false); } /** * Return an instance, which may be shared or independent, of the specified bean. * @param name the name of the bean to retrieve * @param requiredType the required type of the bean to retrieve * @param args arguments to use when creating a bean instance using explicit * arguments (only applied when creating a new instance) * @param typeCheckOnly whether the instance is obtained for a type check, * not for actual use * @return an instance of the bean * @throws BeansException if the bean could not be created */ @SuppressWarnings("unchecked") protected <T> T doGetBean(final String name, @Nullable final Class<T> requiredType, @Nullable final Object[] args, boolean typeCheckOnly) throws BeansException { final String beanName = transformedBeanName(name); Object bean; // Eagerly check singleton cache for manually registered singletons. Object sharedInstance = getSingleton(beanName); if (sharedInstance != null && args == null) { if (logger.isDebugEnabled()) { if (isSingletonCurrentlyInCreation(beanName)) { logger.debug("Returning eagerly cached instance of singleton bean '" + beanName + "' that is not fully initialized yet - circular reference"); } else { logger.debug("Returning cached instance of bean '" + beanName + "'"); } } bean = getObjectForBeanInstance(sharedInstance, name, beanName, null); } else { // Fail if we're already creating this bean instance: // We're assumably within a circular reference. if (isPrototypeCurrentlyInCreation(beanName)) { throw new BeanCurrentlyInCreationException(beanName); } // Check if bean definition exists in this factory. BeanFactory parentBeanFactory = getParentBeanFactory(); if (parentBeanFactory != null && !containsBeanDefinition(beanName)) { // Not found -> check parent. String nameToLookup = originalBeanName(name); if (parentBeanFactory instanceof AbstractBeanFactory) { return ((AbstractBeanFactory) parentBeanFactory).doGetBean( nameToLookup, requiredType, args, typeCheckOnly); } else if (args != null) { // Delegation to parent with explicit args. return (T) parentBeanFactory.getBean(nameToLookup, args); } else { // No args -> delegate to standard getBean method. return parentBeanFactory.getBean(nameToLookup, requiredType); } } if (!typeCheckOnly) { markBeanAsCreated(beanName); } try { final RootBeanDefinition mbd = getMergedLocalBeanDefinition(beanName); checkMergedBeanDefinition(mbd, beanName, args); // Guarantee initialization of beans that the current bean depends on. String[] dependsOn = mbd.getDependsOn(); if (dependsOn != null) { for (String dep : dependsOn) { if (isDependent(beanName, dep)) { throw new BeanCreationException(mbd.getResourceDescription(), beanName, "Circular relationship between '" + beanName + "' and '" + dep + "'"); } registerDependentBean(dep, beanName); getBean(dep); } } // Create bean instance. if (mbd.isSingleton()) { sharedInstance = getSingleton(beanName, () -> { try { return createBean(beanName, mbd, args); } catch (BeansException ex) { // Explicitly remove instance from singleton cache: It might have been put // there eagerly by the creation process, to allow for circular reference // resolution. Also remove any beans that received a temporary reference to // the bean. destroySingleton(beanName); throw ex; } }); bean = getObjectForBeanInstance(sharedInstance, name, beanName, mbd); } else if (mbd.isPrototype()) { // It's a prototype -> create a new instance. Object prototypeInstance = null; try { beforePrototypeCreation(beanName); prototypeInstance = createBean(beanName, mbd, args); } finally { afterPrototypeCreation(beanName); } bean = getObjectForBeanInstance(prototypeInstance, name, beanName, mbd); } else { String scopeName = mbd.getScope(); final Scope scope = this.scopes.get(scopeName); if (scope == null) { throw new IllegalStateException("No Scope for '" + scopeName + "'"); } try { Object scopedInstance = scope.get(beanName, () -> { beforePrototypeCreation(beanName); try { return createBean(beanName, mbd, args); } finally { afterPrototypeCreation(beanName); } }); bean = getObjectForBeanInstance(scopedInstance, name, beanName, mbd); } catch (IllegalStateException ex) { throw new BeanCreationException(beanName, "Scope '" + scopeName + "' is not active for the current thread; " + "define a scoped proxy for this bean to refer to it from a singleton", ex); } } } catch (BeansException ex) { cleanupAfterBeanCreationFailure(beanName); throw ex; } } // Check if required type matches the type of the actual bean instance. // Note that the following return declarations are technically violating the // non-null policy for the getBean methods: However, these will only result // in null under very specific circumstances: such as a user-declared factory // method returning null or a user-provided FactoryBean.getObject() returning // null, without any custom post-processing of such null values. We will pass // them on as null to corresponding injection points in that exceptional case // but do not expect user-level getBean callers to deal with such null values. // In the end, regular getBean callers should be able to assign the outcome // to non-null variables/arguments without being compromised by rather esoteric // corner cases, in particular in functional configuration and Kotlin scenarios. // A future Spring generation might eventually forbid null values completely // and throw IllegalStateExceptions instead of leniently passing them through. if (requiredType != null && bean != null && !requiredType.isInstance(bean)) { try { return getTypeConverter().convertIfNecessary(bean, requiredType); } catch (TypeMismatchException ex) { if (logger.isDebugEnabled()) { logger.debug("Failed to convert bean '" + name + "' to required type '" + ClassUtils.getQualifiedName(requiredType) + "'", ex); } throw new BeanNotOfRequiredTypeException(name, requiredType, bean.getClass()); } } // For the nullability warning, see the elaboration in the comment above; // in short: This is never going to be null unless user-declared code enforces null. return (T) bean; } @Override public boolean containsBean(String name) { String beanName = transformedBeanName(name); if (containsSingleton(beanName) || containsBeanDefinition(beanName)) { return (!BeanFactoryUtils.isFactoryDereference(name) || isFactoryBean(name)); } // Not found -> check parent. BeanFactory parentBeanFactory = getParentBeanFactory(); return (parentBeanFactory != null && parentBeanFactory. containsBean(originalBeanName(name))); } @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((PrivilegedAction<Boolean>) () -> ((fb instanceof SmartFactoryBean && ((SmartFactoryBean<?>) fb).isPrototype()) || !fb.isSingleton()), getAccessControlContext()); } else { return ((fb instanceof SmartFactoryBean && ((SmartFactoryBean<?>) fb).isProto- type()) || !fb.isSingleton()); } } else { return false; } } @Override public boolean isTypeMatch(String name, ResolvableType typeToMatch) throws NoSuchBeanDefinitionException { String beanName = transformedBeanName(name); // Check manually registered singletons. Object beanInstance = getSingleton(beanName, false); if (beanInstance != null) { if (beanInstance instanceof FactoryBean) { if (!BeanFactoryUtils.isFactoryDereference(name)) { Class<?> type = getTypeForFactoryBean((FactoryBean<?>) beanInstance); return (type != null && typeToMatch.isAssignableFrom(type)); } else { return typeToMatch.isInstance(beanInstance); } } else if (!BeanFactoryUtils.isFactoryDereference(name)) { if (typeToMatch.isInstance(beanInstance)) { // Direct match for exposed instance? return true; } else if (typeToMatch.hasGenerics() && containsBeanDefinition(beanName)) { // Generics potentially only match on the target class, not on the proxy... RootBeanDefinition mbd = getMergedLocalBeanDefinition(beanName); Class<?> targetType = mbd.getTargetType(); if (targetType != null && targetType != ClassUtils.getUserClass(beanInstance) && typeToMatch.isAssignableFrom(targetType)) { // Check raw class match as well, making sure it's exposed on the proxy. Class<?> classToMatch = typeToMatch.resolve(); return (classToMatch == null || classToMatch.isInstance(beanInstance)); } } } return false; } else if (containsSingleton(beanName) && !containsBeanDefinition(beanName)) { // null instance registered return false; } // 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.isTypeMatch(originalBeanName(name), typeToMatch); } // Retrieve corresponding bean definition. RootBeanDefinition mbd = getMergedLocalBeanDefinition(beanName); Class<?> classToMatch = typeToMatch.resolve(); if (classToMatch == null) { classToMatch = FactoryBean.class; } Class<?>[] typesToMatch = (FactoryBean.class == classToMatch ? new Class<?>[] {classToMatch} : new Class<?>[] {FactoryBean.class, classToM- atch}); // Check decorated bean definition, if any: We assume it'll be easier // to determine the decorated bean's type than the proxy's type. BeanDefinitionHolder dbd = mbd.getDecoratedDefinition(); if (dbd != null && !BeanFactoryUtils.isFactoryDereference(name)) { RootBeanDefinition tbd = getMergedBeanDefinition(dbd.getBeanName(), dbd.getBean- Definition(), mbd); Class<?> targetClass = predictBeanType(dbd.getBeanName(), tbd, typesToMatch); if (targetClass != null && !FactoryBean.class.isAssignableFrom(targetClass)) { return typeToMatch.isAssignableFrom(targetClass); } } Class<?> beanType = predictBeanType(beanName, mbd, typesToMatch); if (beanType == null) { return false; } // Check bean class whether we're dealing with a FactoryBean. if (FactoryBean.class.isAssignableFrom(beanType)) { if (!BeanFactoryUtils.isFactoryDereference(name)) { // If it's a FactoryBean, we want to look at what it creates, not the factory class. beanType = getTypeForFactoryBean(beanName, mbd); if (beanType == null) { return false; } } } else if (BeanFactoryUtils.isFactoryDereference(name)) { // Special case: A SmartInstantiationAwareBeanPostProcessor returned a non-Fac- toryBean // type but we nevertheless are being asked to dereference a FactoryBean... // Let's check the original bean class and proceed with it if it is a Factory- Bean. beanType = predictBeanType(beanName, mbd, FactoryBean.class); if (beanType == null || !FactoryBean.class.isAssignableFrom(beanType)) { return false; } } ResolvableType resolvableType = mbd.targetType; if (resolvableType == null) { resolvableType = mbd.factoryMethodReturnType; } if (resolvableType != null && resolvableType.resolve() == beanType) { return typeToMatch.isAssignableFrom(resolvableType); } return typeToMatch.isAssignableFrom(beanType); } @Override public boolean isTypeMatch(String name, @Nullable Class<?> typeToMatch) throws NoSuchBeanDefinitionException { return isTypeMatch(name, ResolvableType.forRawClass(typeToMatch)); } @Override public Class<?> getType(String name) throws NoSuchBeanDefinitionException { String beanName = transformedBeanName(name); // Check manually registered singletons. Object beanInstance = getSingleton(beanName, false); if (beanInstance != null) { if (beanInstance instanceof FactoryBean && !BeanFactoryUtils. isFactoryDereference(name)) { return getTypeForFactoryBean((FactoryBean<?>) beanInstance); } else { return beanInstance.getClass(); } } else if (containsSingleton(beanName) && !containsBeanDefinition(beanName)) { // null instance registered return null; } // 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.getType(originalBeanName(name)); } RootBeanDefinition mbd = getMergedLocalBeanDefinition(beanName); // Check decorated bean definition, if any: We assume it'll be easier // to determine the decorated bean's type than the proxy's type. BeanDefinitionHolder dbd = mbd.getDecoratedDefinition(); if (dbd != null && !BeanFactoryUtils.isFactoryDereference(name)) { RootBeanDefinition tbd = getMergedBeanDefinition(dbd.getBeanName(), dbd. getBeanDefinition(), mbd); Class<?> targetClass = predictBeanType(dbd.getBeanName(), tbd); if (targetClass != null && !FactoryBean.class.isAssignableFrom(targetClass)) { return targetClass; } }
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