updatedDefinitions = new ArrayList<>(this.beanDefinitionNames);
updatedDefinitions.remove(beanName);
this.beanDefinitionNames = updatedDefinitions;
}
}
else {
// Still in startup registration phase
this.beanDefinitionNames.remove(beanName);
}
this.frozenBeanDefinitionNames = null;
resetBeanDefinition(beanName);
}
/**
* Reset all bean definition caches for the given bean,
* including the caches of beans that are derived from it.
* Called after an existing bean definition has been replaced or removed,
* triggering {@link #clearMergedBeanDefinition}, {@link #destroySingleton}
* and {@link MergedBeanDefinitionPostProcessor#resetBeanDefinition} on the
* given bean and on all bean definitions that have the given bean as parent.
* @param beanName the name of the bean to reset
* @see #registerBeanDefinition
* @see #removeBeanDefinition
*/
protected void resetBeanDefinition(String beanName) {
// Remove the merged bean definition for the given bean, if already created.
clearMergedBeanDefinition(beanName);
// Remove corresponding bean from singleton cache, if any. Shouldn't usually
// be necessary, rather just meant for overriding a context's default beans
// (e.g. the default StaticMessageSource in a StaticApplicationContext).
destroySingleton(beanName);
// Notify all post-processors that the specified bean definition has been reset.
for (BeanPostProcessor processor : getBeanPostProcessors()) {
if (processor instanceof MergedBeanDefinitionPostProcessor) {
((MergedBeanDefinitionPostProcessor) processor).resetBeanDefinition(beanName);
}
}
// Reset all bean definitions that have the given bean as parent (recursively).
for (String bdName : this.beanDefinitionNames) {
if (!beanName.equals(bdName)) {
BeanDefinition bd = this.beanDefinitionMap.get(bdName);
if (beanName.equals(bd.getParentName())) {
resetBeanDefinition(bdName);
}
}
}
}
/**
* Only allows alias overriding if bean definition overriding is allowed.
*/
@Override
protected boolean allowAliasOverriding() {
return isAllowBeanDefinitionOverriding();
}
@Override
public void registerSingleton(String beanName, Object singletonObject) throws IllegalStateException {
super.registerSingleton(beanName, singletonObject);
updateManualSingletonNames(set -> set.add(beanName), set -> !this.beanDefinitionMap.containsKey(beanName));
clearByTypeCache();
}
@Override
public void destroySingletons() {
super.destroySingletons();
updateManualSingletonNames(Set::clear, set -> !set.isEmpty());
clearByTypeCache();
}
@Override
public void destroySingleton(String beanName) {
super.destroySingleton(beanName);
removeManualSingletonName(beanName);
clearByTypeCache();
}
private void removeManualSingletonName(String beanName) {
updateManualSingletonNames(set -> set.remove(beanName), set -> set.contains(beanName));
}
/**
* Update the factory's internal set of manual singleton names.
* @param action the modification action
* @param condition a precondition for the modification action
* (if this condition does not apply, the action can be skipped)
*/
private void updateManualSingletonNames(Consumer> action, Predicate> condition) {
if (hasBeanCreationStarted()) {
// Cannot modify startup-time collection elements anymore (for stable iteration)
synchronized (this.beanDefinitionMap) {
if (condition.test(this.manualSingletonNames)) {
Set updatedSingletons = new LinkedHashSet<>(this.manualSingletonNames);
action.accept(updatedSingletons);
this.manualSingletonNames = updatedSingletons;
}
}
}
else {
// Still in startup registration phase
if (condition.test(this.manualSingletonNames)) {
action.accept(this.manualSingletonNames);
}
}
}
/**
* Remove any assumptions about by-type mappings.
*/
private void clearByTypeCache() {
this.allBeanNamesByType.clear();
this.singletonBeanNamesByType.clear();
}
//---------------------------------------------------------------------
// Dependency resolution functionality
//---------------------------------------------------------------------
@Override
public NamedBeanHolder resolveNamedBean(Class requiredType) throws BeansException {
NamedBeanHolder namedBean = resolveNamedBean(ResolvableType.forRawClass(requiredType), null, false);
if (namedBean != null) {
return namedBean;
}
BeanFactory parent = getParentBeanFactory();
if (parent instanceof AutowireCapableBeanFactory) {
return ((AutowireCapableBeanFactory) parent).resolveNamedBean(requiredType);
}
throw new NoSuchBeanDefinitionException(requiredType);
}
@SuppressWarnings("unchecked")
@Nullable
private NamedBeanHolder resolveNamedBean(
ResolvableType requiredType, @Nullable Object[] args, boolean nonUniqueAsNull) throws BeansException {
Assert.notNull(requiredType, "Required type must not be null");
String[] candidateNames = getBeanNamesForType(requiredType);
if (candidateNames.length > 1) {
List autowireCandidates = new ArrayList<>(candidateNames.length);
for (String beanName : candidateNames) {
if (!containsBeanDefinition(beanName) || getBeanDefinition(beanName).isAutowireCandidate()) {
autowireCandidates.add(beanName);
}
}
if (!autowireCandidates.isEmpty()) {
candidateNames = StringUtils.toStringArray(autowireCandidates);
}
}
if (candidateNames.length == 1) {
String beanName = candidateNames[0];
return new NamedBeanHolder<>(beanName, (T) getBean(beanName, requiredType.toClass(), args));
}
else if (candidateNames.length > 1) {
Map candidates = new LinkedHashMap<>(candidateNames.length);
for (String beanName : candidateNames) {
if (containsSingleton(beanName) && args == null) {
Object beanInstance = getBean(beanName);
candidates.put(beanName, (beanInstance instanceof NullBean ? null : beanInstance));
}
else {
candidates.put(beanName, getType(beanName));
}
}
String candidateName = determinePrimaryCandidate(candidates, requiredType.toClass());
if (candidateName == null) {
candidateName = determineHighestPriorityCandidate(candidates, requiredType.toClass());
}
if (candidateName != null) {
Object beanInstance = candidates.get(candidateName);
if (beanInstance == null || beanInstance instanceof Class) {
beanInstance = getBean(candidateName, requiredType.toClass(), args);
}
return new NamedBeanHolder<>(candidateName, (T) beanInstance);
}
if (!nonUniqueAsNull) {
throw new NoUniqueBeanDefinitionException(requiredType, candidates.keySet());
}
}
return null;
}
@Override
@Nullable
public Object resolveDependency(DependencyDescriptor descriptor, @Nullable String requestingBeanName,
@Nullable Set autowiredBeanNames, @Nullable TypeConverter typeConverter) throws BeansException {
descriptor.initParameterNameDiscovery(getParameterNameDiscoverer());
if (Optional.class == descriptor.getDependencyType()) {
return createOptionalDependency(descriptor, requestingBeanName);
}
else if (ObjectFactory.class == descriptor.getDependencyType() ||
ObjectProvider.class == descriptor.getDependencyType()) {
return new DependencyObjectProvider(descriptor, requestingBeanName);
}
else if (javaxInjectProviderClass == descriptor.getDependencyType()) {
return new Jsr330Factory().createDependencyProvider(descriptor, requestingBeanName);
}
else {
Object result = getAutowireCandidateResolver().getLazyResolutionProxyIfNecessary(
descriptor, requestingBeanName);
if (result == null) {
result = doResolveDependency(descriptor, requestingBeanName, autowiredBeanNames, typeConverter);
}
return result;
}
}
@Nullable
public Object doResolveDependency(DependencyDescriptor descriptor, @Nullable String beanName,
@Nullable Set autowiredBeanNames, @Nullable TypeConverter typeConverter) throws BeansException {
InjectionPoint previousInjectionPoint = ConstructorResolver.setCurrentInjectionPoint(descriptor);
try {
Object shortcut = descriptor.resolveShortcut(this);
if (shortcut != null) {
return shortcut;
}
Class type = descriptor.getDependencyType();
Object value = getAutowireCandidateResolver().getSuggestedValue(descriptor);
if (value != null) {
if (value instanceof String) {
String strVal = resolveEmbeddedValue((String) value);
BeanDefinition bd = (beanName != null && containsBean(beanName) ?
getMergedBeanDefinition(beanName) : null);
value = evaluateBeanDefinitionString(strVal, bd);
}
TypeConverter converter = (typeConverter != null ? typeConverter : getTypeConverter());
try {
return converter.convertIfNecessary(value, type, descriptor.getTypeDescriptor());
}
catch (UnsupportedOperationException ex) {
// A custom TypeConverter which does not support TypeDescriptor resolution...
return (descriptor.getField() != null ?
converter.convertIfNecessary(value, type, descriptor.getField()) :
converter.convertIfNecessary(value, type, descriptor.getMethodParameter()));
}
}
Object multipleBeans = resolveMultipleBeans(descriptor, beanName, autowiredBeanNames, typeConverter);
if (multipleBeans != null) {
return multipleBeans;
}
Map matchingBeans = findAutowireCandidates(beanName, type, descriptor);
if (matchingBeans.isEmpty()) {
if (isRequired(descriptor)) {
raiseNoMatchingBeanFound(type, descriptor.getResolvableType(), descriptor);
}
return null;
}
String autowiredBeanName;
Object instanceCandidate;
if (matchingBeans.size() > 1) {
autowiredBeanName = determineAutowireCandidate(matchingBeans, descriptor);
if (autowiredBeanName == null) {
if (isRequired(descriptor) || !indicatesMultipleBeans(type)) {
return descriptor.resolveNotUnique(descriptor.getResolvableType(), matchingBeans);
}
else {
// In case of an optional Collection/Map, silently ignore a non-unique case:
// possibly it was meant to be an empty collection of multiple regular beans
// (before 4.3 in particular when we didn't even look for collection beans).
return null;
}
}
instanceCandidate = matchingBeans.get(autowiredBeanName);
}
else {
// We have exactly one match.
Map.Entry entry = matchingBeans.entrySet().iterator().next();
autowiredBeanName = entry.getKey();
instanceCandidate = entry.getValue();
}
if (autowiredBeanNames != null) {
autowiredBeanNames.add(autowiredBeanName);
}
if (instanceCandidate instanceof Class) {
instanceCandidate = descriptor.resolveCandidate(autowiredBeanName, type, this);
}
Object result = instanceCandidate;
if (result instanceof NullBean) {
if (isRequired(descriptor)) {
raiseNoMatchingBeanFound(type, descriptor.getResolvableType(), descriptor);
}
result = null;
}
if (!ClassUtils.isAssignableValue(type, result)) {
throw new BeanNotOfRequiredTypeException(autowiredBeanName, type, instanceCandidate.getClass());
}
return result;
}
finally {
ConstructorResolver.setCurrentInjectionPoint(previousInjectionPoint);
}
}
@Nullable
private Object resolveMultipleBeans(DependencyDescriptor descriptor, @Nullable String beanName,
@Nullable Set autowiredBeanNames, @Nullable TypeConverter typeConverter) {
final Class type = descriptor.getDependencyType();
if (descriptor instanceof StreamDependencyDescriptor) {
Map matchingBeans = findAutowireCandidates(beanName, type, descriptor);
if (autowiredBeanNames != null) {
autowiredBeanNames.addAll(matchingBeans.keySet());
}
Stream stream = matchingBeans.keySet().stream()
.map(name -> descriptor.resolveCandidate(name, type, this))
.filter(bean -> !(bean instanceof NullBean));
if (((StreamDependencyDescriptor) descriptor).isOrdered()) {
stream = stream.sorted(adaptOrderComparator(matchingBeans));
}
return stream;
}
else if (type.isArray()) {
Class componentType = type.getComponentType();
ResolvableType resolvableType = descriptor.getResolvableType();
Class resolvedArrayType = resolvableType.resolve(type);
if (resolvedArrayType != type) {
componentType = resolvableType.getComponentType().resolve();
}
if (componentType == null) {
return null;
}
Map matchingBeans = findAutowireCandidates(beanName, componentType,
new MultiElementDescriptor(descriptor));
if (matchingBeans.isEmpty()) {
return null;
}
if (autowiredBeanNames != null) {
autowiredBeanNames.addAll(matchingBeans.keySet());
}
TypeConverter converter = (typeConverter != null ? typeConverter : getTypeConverter());
Object result = converter.convertIfNecessary(matchingBeans.values(), resolvedArrayType);
if (result instanceof Object[]) {
Comparator comparator = adaptDependencyComparator(matchingBeans);
if (comparator != null) {
Arrays.sort((Object[]) result, comparator);
}
}
return result;
}
else if (Collection.class.isAssignableFrom(type) && type.isInterface()) {
Class elementType = descriptor.getResolvableType().asCollection().resolveGeneric();
if (elementType == null) {
return null;
}
Map matchingBeans = findAutowireCandidates(beanName, elementType,
new MultiElementDescriptor(descriptor));
if (matchingBeans.isEmpty()) {
return null;
}
if (autowiredBeanNames != null) {
autowiredBeanNames.addAll(matchingBeans.keySet());
}
TypeConverter converter = (typeConverter != null ? typeConverter : getTypeConverter());
Object result = converter.convertIfNecessary(matchingBeans.values(), type);
if (result instanceof List) {
Comparator comparator = adaptDependencyComparator(matchingBeans);
if (comparator != null) {
((List) result).sort(comparator);
}
}
return result;
}
else if (Map.class == type) {
ResolvableType mapType = descriptor.getResolvableType().asMap();
Class keyType = mapType.resolveGeneric(0);
if (String.class != keyType) {
return null;
}
Class valueType = mapType.resolveGeneric(1);
if (valueType == null) {
return null;
}
Map matchingBeans = findAutowireCandidates(beanName, valueType,
new MultiElementDescriptor(descriptor));
if (matchingBeans.isEmpty()) {
return null;
}
if (autowiredBeanNames != null) {
autowiredBeanNames.addAll(matchingBeans.keySet());
}
return matchingBeans;
}
else {
return null;
}
}
private boolean isRequired(DependencyDescriptor descriptor) {
return getAutowireCandidateResolver().isRequired(descriptor);
}
private boolean indicatesMultipleBeans(Class type) {
return (type.isArray() || (type.isInterface() &&
(Collection.class.isAssignableFrom(type) || Map.class.isAssignableFrom(type))));
}
@Nullable
private Comparator adaptDependencyComparator(Map matchingBeans) {
Comparator comparator = getDependencyComparator();
if (comparator instanceof OrderComparator) {
return ((OrderComparator) comparator).withSourceProvider(
createFactoryAwareOrderSourceProvider(matchingBeans));
}
else {
return comparator;
}
}
private Comparator adaptOrderComparator(Map matchingBeans) {
Comparator dependencyComparator = getDependencyComparator();
OrderComparator comparator = (dependencyComparator instanceof OrderComparator ?
(OrderComparator) dependencyComparator : OrderComparator.INSTANCE);
return comparator.withSourceProvider(createFactoryAwareOrderSourceProvider(matchingBeans));
}
private OrderComparator.OrderSourceProvider createFactoryAwareOrderSourceProvider(Map beans) {
IdentityHashMap instancesToBeanNames = new IdentityHashMap<>();
beans.forEach((beanName, instance) -> instancesToBeanNames.put(instance, beanName));
return new FactoryAwareOrderSourceProvider(instancesToBeanNames);
}
/**
* Find bean instances that match the required type.
* Called during autowiring for the specified bean.
* @param beanName the name of the bean that is about to be wired
* @param requiredType the actual type of bean to look for
* (may be an array component type or collection element type)
* @param descriptor the descriptor of the dependency to resolve
* @return a Map of candidate names and candidate instances that match
* the required type (never {@code null})
* @throws BeansException in case of errors
* @see #autowireByType
* @see #autowireConstructor
*/
protected Map findAutowireCandidates(
@Nullable String beanName, Class requiredType, DependencyDescriptor descriptor) {
String[] candidateNames = BeanFactoryUtils.beanNamesForTypeIncludingAncestors(
this, requiredType, true, descriptor.isEager());
Map result = new LinkedHashMap<>(candidateNames.length);
for (Map.Entry, Object> classObjectEntry : this.resolvableDependencies.entrySet()) {
Class autowiringType = classObjectEntry.getKey();
if (autowiringType.isAssignableFrom(requiredType)) {
Object autowiringValue = classObjectEntry.getValue();
autowiringValue = AutowireUtils.resolveAutowiringValue(autowiringValue, requiredType);
if (requiredType.isInstance(autowiringValue)) {
result.put(ObjectUtils.identityToString(autowiringValue), autowiringValue);
break;
}
}
}
for (String candidate : candidateNames) {
if (!isSelfReference(beanName, candidate) && isAutowireCandidate(candidate, descriptor)) {
addCandidateEntry(result, candidate, descriptor, requiredType);
}
}
if (result.isEmpty()) {
boolean multiple = indicatesMultipleBeans(requiredType);
// Consider fallback matches if the first pass failed to find anything...
DependencyDescriptor fallbackDescriptor = descriptor.forFallbackMatch();
for (String candidate : candidateNames) {
if (!isSelfReference(beanName, candidate) && isAutowireCandidate(candidate, fallbackDescriptor) &&
(!multiple || getAutowireCandidateResolver().hasQualifier(descriptor))) {
addCandidateEntry(result, candidate, descriptor, requiredType);
}
}
if (result.isEmpty() && !multiple) {
// Consider self references as a final pass...
// but in the case of a dependency collection, not the very same bean itself.
for (String candidate : candidateNames) {
if (isSelfReference(beanName, candidate) &&
(!(descriptor instanceof MultiElementDescriptor) || !beanName.equals(candidate)) &&
isAutowireCandidate(candidate, fallbackDescriptor)) {
addCandidateEntry(result, candidate, descriptor, requiredType);
}
}
}
}
return result;
}
/**
* Add an entry to the candidate map: a bean instance if available or just the resolved
* type, preventing early bean initialization ahead of primary candidate selection.
*/
private void addCandidateEntry(Map candidates, String candidateName,
DependencyDescriptor descriptor, Class requiredType) {
if (descriptor instanceof MultiElementDescriptor) {
Object beanInstance = descriptor.resolveCandidate(candidateName, requiredType, this);
if (!(beanInstance instanceof NullBean)) {
candidates.put(candidateName, beanInstance);
}
}
else if (containsSingleton(candidateName) || (descriptor instanceof StreamDependencyDescriptor &&
((StreamDependencyDescriptor) descriptor).isOrdered())) {
Object beanInstance = descriptor.resolveCandidate(candidateName, requiredType, this);
candidates.put(candidateName, (beanInstance instanceof NullBean ? null : beanInstance));
}
else {
candidates.put(candidateName, getType(candidateName));
}
}
/**
* Determine the autowire candidate in the given set of beans.
* Looks for {@code @Primary} and {@code @Priority} (in that order).
* @param candidates a Map of candidate names and candidate instances
* that match the required type, as returned by {@link #findAutowireCandidates}
* @param descriptor the target dependency to match against
* @return the name of the autowire candidate, or {@code null} if none found
*/
@Nullable
protected String determineAutowireCandidate(Map candidates, DependencyDescriptor descriptor) {
Class requiredType = descriptor.getDependencyType();
String primaryCandidate = determinePrimaryCandidate(candidates, requiredType);
if (primaryCandidate != null) {
return primaryCandidate;
}
String priorityCandidate = determineHighestPriorityCandidate(candidates, requiredType);
if (priorityCandidate != null) {
return priorityCandidate;
}
// Fallback
for (Map.Entry entry : candidates.entrySet()) {
String candidateName = entry.getKey();
Object beanInstance = entry.getValue();
if ((beanInstance != null && this.resolvableDependencies.containsValue(beanInstance)) ||
matchesBeanName(candidateName, descriptor.getDependencyName())) {
return candidateName;
}
}
return null;
}
/**
* Determine the primary candidate in the given set of beans.
* @param candidates a Map of candidate names and candidate instances
* (or candidate classes if not created yet) that match the required type
* @param requiredType the target dependency type to match against
* @return the name of the primary candidate, or {@code null} if none found
* @see #isPrimary(String, Object)
*/
@Nullable
protected String determinePrimaryCandidate(Map candidates, Class requiredType) {
String primaryBeanName = null;
for (Map.Entry entry : candidates.entrySet()) {
String candidateBeanName = entry.getKey();
Object beanInstance = entry.getValue();
if (isPrimary(candidateBeanName, beanInstance)) {
if (primaryBeanName != null) {
boolean candidateLocal = containsBeanDefinition(candidateBeanName);
boolean primaryLocal = containsBeanDefinition(primaryBeanName);
if (candidateLocal && primaryLocal) {
throw new NoUniqueBeanDefinitionException(requiredType, candidates.size(),
"more than one 'primary' bean found among candidates: " + candidates.keySet());
}
else if (candidateLocal) {
primaryBeanName = candidateBeanName;
}
}
else {
primaryBeanName = candidateBeanName;
}
}
}
return primaryBeanName;
}
/**
* Determine the candidate with the highest priority in the given set of beans.
* Based on {@code @javax.annotation.Priority}. As defined by the related
* {@link org.springframework.core.Ordered} interface, the lowest value has
* the highest priority.
* @param candidates a Map of candidate names and candidate instances
* (or candidate classes if not created yet) that match the required type
* @param requiredType the target dependency type to match against
* @return the name of the candidate with the highest priority,
* or {@code null} if none found
* @see #getPriority(Object)
*/
@Nullable
protected String determineHighestPriorityCandidate(Map candidates, Class requiredType) {
String highestPriorityBeanName = null;
Integer highestPriority = null;
for (Map.Entry entry : candidates.entrySet()) {
String candidateBeanName = entry.getKey();
Object beanInstance = entry.getValue();
if (beanInstance != null) {
Integer candidatePriority = getPriority(beanInstance);
if (candidatePriority != null) {
if (highestPriorityBeanName != null) {
if (candidatePriority.equals(highestPriority)) {
throw new NoUniqueBeanDefinitionException(requiredType, candidates.size(),
"Multiple beans found with the same priority ('" + highestPriority +
"') among candidates: " + candidates.keySet());
}
else if (candidatePriority < highestPriority) {
highestPriorityBeanName = candidateBeanName;
highestPriority = candidatePriority;
}
}
else {
highestPriorityBeanName = candidateBeanName;
highestPriority = candidatePriority;
}
}
}
}
return highestPriorityBeanName;
}
/**
* Return whether the bean definition for the given bean name has been
* marked as a primary bean.
* @param beanName the name of the bean
* @param beanInstance the corresponding bean instance (can be null)
* @return whether the given bean qualifies as primary
*/
protected boolean isPrimary(String beanName, Object beanInstance) {
if (containsBeanDefinition(beanName)) {
return getMergedLocalBeanDefinition(beanName).isPrimary();
}
BeanFactory parent = getParentBeanFactory();
return (parent instanceof DefaultListableBeanFactory &&
((DefaultListableBeanFactory) parent).isPrimary(beanName, beanInstance));
}
/**
* Return the priority assigned for the given bean instance by
* the {@code javax.annotation.Priority} annotation.
* The default implementation delegates to the specified
* {@link #setDependencyComparator dependency comparator}, checking its
* {@link OrderComparator#getPriority method} if it is an extension of
* Spring's common {@link OrderComparator} - typically, an
* {@link org.springframework.core.annotation.AnnotationAwareOrderComparator}.
* If no such comparator is present, this implementation returns {@code null}.
* @param beanInstance the bean instance to check (can be {@code null})
* @return the priority assigned to that bean or {@code null} if none is set
*/
@Nullable
protected Integer getPriority(Object beanInstance) {
Comparator comparator = getDependencyComparator();
if (comparator instanceof OrderComparator) {
return ((OrderComparator) comparator).getPriority(beanInstance);
}
return null;
}
/**
* Determine whether the given candidate name matches the bean name or the aliases
* stored in this bean definition.
*/
protected boolean matchesBeanName(String beanName, @Nullable String candidateName) {
return (candidateName != null &&
(candidateName.equals(beanName) || ObjectUtils.containsElement(getAliases(beanName), candidateName)));
}
/**
* Determine whether the given beanName/candidateName pair indicates a self reference,
* i.e. whether the candidate points back to the original bean or to a factory method
* on the original bean.
*/
private boolean isSelfReference(@Nullable String beanName, @Nullable String candidateName) {
return (beanName != null && candidateName != null &&
(beanName.equals(candidateName) || (containsBeanDefinition(candidateName) &&
beanName.equals(getMergedLocalBeanDefinition(candidateName).getFactoryBeanName()))));
}
/**
* Raise a NoSuchBeanDefinitionException or BeanNotOfRequiredTypeException
* for an unresolvable dependency.
*/
private void raiseNoMatchingBeanFound(
Class type, ResolvableType resolvableType, DependencyDescriptor descriptor) throws BeansException {
checkBeanNotOfRequiredType(type, descriptor);
throw new NoSuchBeanDefinitionException(resolvableType,
"expected at least 1 bean which qualifies as autowire candidate. " +
"Dependency annotations: " + ObjectUtils.nullSafeToString(descriptor.getAnnotations()));
}
/**
* Raise a BeanNotOfRequiredTypeException for an unresolvable dependency, if applicable,
* i.e. if the target type of the bean would match but an exposed proxy doesn't.
*/
private void checkBeanNotOfRequiredType(Class type, DependencyDescriptor descriptor) {
for (String beanName : this.beanDefinitionNames) {
RootBeanDefinition mbd = getMergedLocalBeanDefinition(beanName);
Class targetType = mbd.getTargetType();
if (targetType != null && type.isAssignableFrom(targetType) &&
isAutowireCandidate(beanName, mbd, descriptor, getAutowireCandidateResolver())) {
// Probably a proxy interfering with target type match -> throw meaningful exception.
Object beanInstance = getSingleton(beanName, false);
Class beanType = (beanInstance != null && beanInstance.getClass() != NullBean.class ?
beanInstance.getClass() : predictBeanType(beanName, mbd));
if (beanType != null && !type.isAssignableFrom(beanType)) {
throw new BeanNotOfRequiredTypeException(beanName, type, beanType);
}
}
}
BeanFactory parent = getParentBeanFactory();
if (parent instanceof DefaultListableBeanFactory) {
((DefaultListableBeanFactory) parent).checkBeanNotOfRequiredType(type, descriptor);
}
}
/**
* Create an {@link Optional} wrapper for the specified dependency.
*/
private Optional createOptionalDependency(
DependencyDescriptor descriptor, @Nullable String beanName, final Object... args) {
DependencyDescriptor descriptorToUse = new NestedDependencyDescriptor(descriptor) {
@Override
public boolean isRequired() {
return false;
}
@Override
public Object resolveCandidate(String beanName, Class requiredType, BeanFactory beanFactory) {
return (!ObjectUtils.isEmpty(args) ? beanFactory.getBean(beanName, args) :
super.resolveCandidate(beanName, requiredType, beanFactory));
}
};
Object result = doResolveDependency(descriptorToUse, beanName, null, null);
return (result instanceof Optional ? (Optional) result : Optional.ofNullable(result));
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder(ObjectUtils.identityToString(this));
sb.append(": defining beans [");
sb.append(StringUtils.collectionToCommaDelimitedString(this.beanDefinitionNames));
sb.append("]; ");
BeanFactory parent = getParentBeanFactory();
if (parent == null) {
sb.append("root of factory hierarchy");
}
else {
sb.append("parent: ").append(ObjectUtils.identityToString(parent));
}
return sb.toString();
}
//---------------------------------------------------------------------
// Serialization support
//---------------------------------------------------------------------
private void readObject(ObjectInputStream ois) throws IOException, ClassNotFoundException {
throw new NotSerializableException("DefaultListableBeanFactory itself is not deserializable - " +
"just a SerializedBeanFactoryReference is");
}
protected Object writeReplace() throws ObjectStreamException {
if (this.serializationId != null) {
return new SerializedBeanFactoryReference(this.serializationId);
}
else {
throw new NotSerializableException("DefaultListableBeanFactory has no serialization id");
}
}
/**
* Minimal id reference to the factory.
* Resolved to the actual factory instance on deserialization.
*/
private static class SerializedBeanFactoryReference implements Serializable {
private final String id;
public SerializedBeanFactoryReference(String id) {
this.id = id;
}
private Object readResolve() {
Reference ref = serializableFactories.get(this.id);
if (ref != null) {
Object result = ref.get();
if (result != null) {
return result;
}
}
// Lenient fallback: dummy factory in case of original factory not found...
DefaultListableBeanFactory dummyFactory = new DefaultListableBeanFactory();
dummyFactory.serializationId = this.id;
return dummyFactory;
}
}
/**
* A dependency descriptor marker for nested elements.
*/
private static class NestedDependencyDescriptor extends DependencyDescriptor {
public NestedDependencyDescriptor(DependencyDescriptor original) {
super(original);
increaseNestingLevel();
}
}
/**
* A dependency descriptor for a multi-element declaration with nested elements.
*/
private static class MultiElementDescriptor extends NestedDependencyDescriptor {
public MultiElementDescriptor(DependencyDescriptor original) {
super(original);
}
}
/**
* A dependency descriptor marker for stream access to multiple elements.
*/
private static class StreamDependencyDescriptor extends DependencyDescriptor {
private final boolean ordered;
public StreamDependencyDescriptor(DependencyDescriptor original, boolean ordered) {
super(original);
this.ordered = ordered;
}
public boolean isOrdered() {
return this.ordered;
}
}
private interface BeanObjectProvider extends ObjectProvider, Serializable {
}
/**
* Serializable ObjectFactory/ObjectProvider for lazy resolution of a dependency.
*/
private class DependencyObjectProvider implements BeanObjectProvider {
private final DependencyDescriptor descriptor;
private final boolean optional;
@Nullable
private final String beanName;
public DependencyObjectProvider(DependencyDescriptor descriptor, @Nullable String beanName) {
this.descriptor = new NestedDependencyDescriptor(descriptor);
this.optional = (this.descriptor.getDependencyType() == Optional.class);
this.beanName = beanName;
}
@Override
public Object getObject() throws BeansException {
if (this.optional) {
return createOptionalDependency(this.descriptor, this.beanName);
}
else {
Object result = doResolveDependency(this.descriptor, this.beanName, null, null);
if (result == null) {
throw new NoSuchBeanDefinitionException(this.descriptor.getResolvableType());
}
return result;
}
}
@Override
public Object getObject(final Object... args) throws BeansException {
if (this.optional) {
return createOptionalDependency(this.descriptor, this.beanName, args);
}
else {
DependencyDescriptor descriptorToUse = new DependencyDescriptor(this.descriptor) {
@Override
public Object resolveCandidate(String beanName, Class requiredType, BeanFactory beanFactory) {
return beanFactory.getBean(beanName, args);
}
};
Object result = doResolveDependency(descriptorToUse, this.beanName, null, null);
if (result == null) {
throw new NoSuchBeanDefinitionException(this.descriptor.getResolvableType());
}
return result;
}
}
@Override
@Nullable
public Object getIfAvailable() throws BeansException {
if (this.optional) {
return createOptionalDependency(this.descriptor, this.beanName);
}
else {
DependencyDescriptor descriptorToUse = new DependencyDescriptor(this.descriptor) {
@Override
public boolean isRequired() {
return false;
}
};
return doResolveDependency(descriptorToUse, this.beanName, null, null);
}
}
@Override
@Nullable
public Object getIfUnique() throws BeansException {
DependencyDescriptor descriptorToUse = new DependencyDescriptor(this.descriptor) {
@Override
public boolean isRequired() {
return false;
}
@Override
@Nullable
public Object resolveNotUnique(ResolvableType type, Map matchingBeans) {
return null;
}
};
if (this.optional) {
return createOptionalDependency(descriptorToUse, this.beanName);
}
else {
return doResolveDependency(descriptorToUse, this.beanName, null, null);
}
}
@Nullable
protected Object getValue() throws BeansException {
if (this.optional) {
return createOptionalDependency(this.descriptor, this.beanName);
}
else {
return doResolveDependency(this.descriptor, this.beanName, null, null);
}
}
@Override
public Stream stream() {
return resolveStream(false);
}
@Override
public Stream orderedStream() {
return resolveStream(true);
}
@SuppressWarnings("unchecked")
private Stream resolveStream(boolean ordered) {
DependencyDescriptor descriptorToUse = new StreamDependencyDescriptor(this.descriptor, ordered);
Object result = doResolveDependency(descriptorToUse, this.beanName, null, null);
return (result instanceof Stream ? (Stream) result : Stream.of(result));
}
}
/**
* Separate inner class for avoiding a hard dependency on the {@code javax.inject} API.
* Actual {@code javax.inject.Provider} implementation is nested here in order to make it
* invisible for Graal's introspection of DefaultListableBeanFactory's nested classes.
*/
private class Jsr330Factory implements Serializable {
public Object createDependencyProvider(DependencyDescriptor descriptor, @Nullable String beanName) {
return new Jsr330Provider(descriptor, beanName);
}
private class Jsr330Provider extends DependencyObjectProvider implements Provider {
public Jsr330Provider(DependencyDescriptor descriptor, @Nullable String beanName) {
super(descriptor, beanName);
}
@Override
@Nullable
public Object get() throws BeansException {
return getValue();
}
}
}
/**
* An {@link org.springframework.core.OrderComparator.OrderSourceProvider} implementation
* that is aware of the bean metadata of the instances to sort.
* Lookup for the method factory of an instance to sort, if any, and let the
* comparator retrieve the {@link org.springframework.core.annotation.Order}
* value defined on it. This essentially allows for the following construct:
*/
private class FactoryAwareOrderSourceProvider implements OrderComparator.OrderSourceProvider {
private final Map instancesToBeanNames;
public FactoryAwareOrderSourceProvider(Map instancesToBeanNames) {
this.instancesToBeanNames = instancesToBeanNames;
}
@Override
@Nullable
public Object getOrderSource(Object obj) {
String beanName = this.instancesToBeanNames.get(obj);
if (beanName == null || !containsBeanDefinition(beanName)) {
return null;
}
RootBeanDefinition beanDefinition = getMergedLocalBeanDefinition(beanName);
List sources = new ArrayList<>(2);
Method factoryMethod = beanDefinition.getResolvedFactoryMethod();
if (factoryMethod != null) {
sources.add(factoryMethod);
}
Class targetType = beanDefinition.getTargetType();
if (targetType != null && targetType != obj.getClass()) {
sources.add(targetType);
}
return sources.toArray();
}
}
}