spring CommonAnnotationBeanPostProcessor 源码
spring CommonAnnotationBeanPostProcessor 代码
文件路径：/spring-context/src/main/java/org/springframework/context/annotation/CommonAnnotationBeanPostProcessor.java
/*
* Copyright 2002-2021 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.context.annotation;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.io.Serializable;
import java.lang.annotation.Annotation;
import java.lang.reflect.AnnotatedElement;
import java.lang.reflect.Field;
import java.lang.reflect.Member;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import jakarta.annotation.PostConstruct;
import jakarta.annotation.PreDestroy;
import jakarta.annotation.Resource;
import jakarta.ejb.EJB;
import org.springframework.aop.TargetSource;
import org.springframework.aop.framework.ProxyFactory;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.PropertyValues;
import org.springframework.beans.factory.BeanCreationException;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor;
import org.springframework.beans.factory.annotation.InjectionMetadata;
import org.springframework.beans.factory.config.AutowireCapableBeanFactory;
import org.springframework.beans.factory.config.ConfigurableBeanFactory;
import org.springframework.beans.factory.config.DependencyDescriptor;
import org.springframework.beans.factory.config.EmbeddedValueResolver;
import org.springframework.beans.factory.config.InstantiationAwareBeanPostProcessor;
import org.springframework.beans.factory.support.RootBeanDefinition;
import org.springframework.core.BridgeMethodResolver;
import org.springframework.core.MethodParameter;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.AnnotationUtils;
import org.springframework.jndi.support.SimpleJndiBeanFactory;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.util.ClassUtils;
import org.springframework.util.ReflectionUtils;
import org.springframework.util.StringUtils;
import org.springframework.util.StringValueResolver;
/**
* {@link org.springframework.beans.factory.config.BeanPostProcessor} implementation
* that supports common Java annotations out of the box, in particular the common
* annotations in the {@code jakarta.annotation} package. These common Java
* annotations are supported in many Jakarta EE technologies (e.g. JSF and JAX-RS).
*
* <p>This post-processor includes support for the {@link jakarta.annotation.PostConstruct}
* and {@link jakarta.annotation.PreDestroy} annotations - as init annotation
* and destroy annotation, respectively - through inheriting from
* {@link InitDestroyAnnotationBeanPostProcessor} with pre-configured annotation types.
*
* <p>The central element is the {@link jakarta.annotation.Resource} annotation
* for annotation-driven injection of named beans, by default from the containing
* Spring BeanFactory, with only {@code mappedName} references resolved in JNDI.
* The {@link #setAlwaysUseJndiLookup "alwaysUseJndiLookup" flag} enforces JNDI lookups
* equivalent to standard Jakarta EE resource injection for {@code name} references
* and default names as well. The target beans can be simple POJOs, with no special
* requirements other than the type having to match.
*
* <p>This post-processor also supports the EJB 3 {@link jakarta.ejb.EJB} annotation,
* analogous to {@link jakarta.annotation.Resource}, with the capability to
* specify both a local bean name and a global JNDI name for fallback retrieval.
* The target beans can be plain POJOs as well as EJB 3 Session Beans in this case.
*
* <p>For default usage, resolving resource names as Spring bean names,
* simply define the following in your application context:
*
* <pre class="code">
* <bean class="org.springframework.context.annotation.CommonAnnotationBeanPostProcessor"/></pre>
*
* For direct JNDI access, resolving resource names as JNDI resource references
* within the Jakarta EE application's "java:comp/env/" namespace, use the following:
*
* <pre class="code">
* <bean class="org.springframework.context.annotation.CommonAnnotationBeanPostProcessor">
* <property name="alwaysUseJndiLookup" value="true"/>
* </bean></pre>
*
* {@code mappedName} references will always be resolved in JNDI,
* allowing for global JNDI names (including "java:" prefix) as well. The
* "alwaysUseJndiLookup" flag just affects {@code name} references and
* default names (inferred from the field name / property name).
*
* <p><b>NOTE:</b> A default CommonAnnotationBeanPostProcessor will be registered
* by the "context:annotation-config" and "context:component-scan" XML tags.
* Remove or turn off the default annotation configuration there if you intend
* to specify a custom CommonAnnotationBeanPostProcessor bean definition!
* <p><b>NOTE:</b> Annotation injection will be performed <i>before</i> XML injection; thus
* the latter configuration will override the former for properties wired through
* both approaches.
*
* @author Juergen Hoeller
* @author Sam Brannen
* @since 2.5
* @see #setAlwaysUseJndiLookup
* @see #setResourceFactory
* @see org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor
* @see org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor
*/
@SuppressWarnings("serial")
public class CommonAnnotationBeanPostProcessor extends InitDestroyAnnotationBeanPostProcessor
implements InstantiationAwareBeanPostProcessor, BeanFactoryAware, Serializable {
// Defensive reference to JNDI API for JDK 9+ (optional java.naming module)
private static final boolean jndiPresent = ClassUtils.isPresent(
"javax.naming.InitialContext", CommonAnnotationBeanPostProcessor.class.getClassLoader());
private static final Set<Class<? extends Annotation>> resourceAnnotationTypes = new LinkedHashSet<>(4);
@Nullable
private static final Class<? extends Annotation> ejbClass;
static {
resourceAnnotationTypes.add(Resource.class);
ejbClass = loadAnnotationType("jakarta.ejb.EJB");
if (ejbClass != null) {
resourceAnnotationTypes.add(ejbClass);
}
}
private final Set<String> ignoredResourceTypes = new HashSet<>(1);
private boolean fallbackToDefaultTypeMatch = true;
private boolean alwaysUseJndiLookup = false;
@Nullable
private transient BeanFactory jndiFactory;
@Nullable
private transient BeanFactory resourceFactory;
@Nullable
private transient BeanFactory beanFactory;
@Nullable
private transient StringValueResolver embeddedValueResolver;
private final transient Map<String, InjectionMetadata> injectionMetadataCache = new ConcurrentHashMap<>(256);
/**
* Create a new CommonAnnotationBeanPostProcessor,
* with the init and destroy annotation types set to
* {@link jakarta.annotation.PostConstruct} and {@link jakarta.annotation.PreDestroy},
* respectively.
*/
public CommonAnnotationBeanPostProcessor() {
setOrder(Ordered.LOWEST_PRECEDENCE - 3);
setInitAnnotationType(PostConstruct.class);
setDestroyAnnotationType(PreDestroy.class);
// java.naming module present on JDK 9+?
if (jndiPresent) {
this.jndiFactory = new SimpleJndiBeanFactory();
}
}
/**
* Ignore the given resource type when resolving {@code @Resource} annotations.
* @param resourceType the resource type to ignore
*/
public void ignoreResourceType(String resourceType) {
Assert.notNull(resourceType, "Ignored resource type must not be null");
this.ignoredResourceTypes.add(resourceType);
}
/**
* Set whether to allow a fallback to a type match if no explicit name has been
* specified. The default name (i.e. the field name or bean property name) will
* still be checked first; if a bean of that name exists, it will be taken.
* However, if no bean of that name exists, a by-type resolution of the
* dependency will be attempted if this flag is "true".
* <p>Default is "true". Switch this flag to "false" in order to enforce a
* by-name lookup in all cases, throwing an exception in case of no name match.
* @see org.springframework.beans.factory.config.AutowireCapableBeanFactory#resolveDependency
*/
public void setFallbackToDefaultTypeMatch(boolean fallbackToDefaultTypeMatch) {
this.fallbackToDefaultTypeMatch = fallbackToDefaultTypeMatch;
}
/**
* Set whether to always use JNDI lookups equivalent to standard Jakarta EE resource
* injection, <b>even for {@code name} attributes and default names</b>.
* <p>Default is "false": Resource names are used for Spring bean lookups in the
* containing BeanFactory; only {@code mappedName} attributes point directly
* into JNDI. Switch this flag to "true" for enforcing Jakarta EE style JNDI lookups
* in any case, even for {@code name} attributes and default names.
* @see #setJndiFactory
* @see #setResourceFactory
*/
public void setAlwaysUseJndiLookup(boolean alwaysUseJndiLookup) {
this.alwaysUseJndiLookup = alwaysUseJndiLookup;
}
/**
* Specify the factory for objects to be injected into {@code @Resource} /
* {@code @EJB} annotated fields and setter methods,
* <b>for {@code mappedName} attributes that point directly into JNDI</b>.
* This factory will also be used if "alwaysUseJndiLookup" is set to "true" in order
* to enforce JNDI lookups even for {@code name} attributes and default names.
* <p>The default is a {@link org.springframework.jndi.support.SimpleJndiBeanFactory}
* for JNDI lookup behavior equivalent to standard Jakarta EE resource injection.
* @see #setResourceFactory
* @see #setAlwaysUseJndiLookup
*/
public void setJndiFactory(BeanFactory jndiFactory) {
Assert.notNull(jndiFactory, "BeanFactory must not be null");
this.jndiFactory = jndiFactory;
}
/**
* Specify the factory for objects to be injected into {@code @Resource} /
* {@code @EJB} annotated fields and setter methods,
* <b>for {@code name} attributes and default names</b>.
* <p>The default is the BeanFactory that this post-processor is defined in,
* if any, looking up resource names as Spring bean names. Specify the resource
* factory explicitly for programmatic usage of this post-processor.
* <p>Specifying Spring's {@link org.springframework.jndi.support.SimpleJndiBeanFactory}
* leads to JNDI lookup behavior equivalent to standard Jakarta EE resource injection,
* even for {@code name} attributes and default names. This is the same behavior
* that the "alwaysUseJndiLookup" flag enables.
* @see #setAlwaysUseJndiLookup
*/
public void setResourceFactory(BeanFactory resourceFactory) {
Assert.notNull(resourceFactory, "BeanFactory must not be null");
this.resourceFactory = resourceFactory;
}
@Override
public void setBeanFactory(BeanFactory beanFactory) {
Assert.notNull(beanFactory, "BeanFactory must not be null");
this.beanFactory = beanFactory;
if (this.resourceFactory == null) {
this.resourceFactory = beanFactory;
}
if (beanFactory instanceof ConfigurableBeanFactory configurableBeanFactory) {
this.embeddedValueResolver = new EmbeddedValueResolver(configurableBeanFactory);
}
}
@Override
public void postProcessMergedBeanDefinition(RootBeanDefinition beanDefinition, Class<?> beanType, String beanName) {
super.postProcessMergedBeanDefinition(beanDefinition, beanType, beanName);
InjectionMetadata metadata = findResourceMetadata(beanName, beanType, null);
metadata.checkConfigMembers(beanDefinition);
}
@Override
public void resetBeanDefinition(String beanName) {
this.injectionMetadataCache.remove(beanName);
}
@Override
public Object postProcessBeforeInstantiation(Class<?> beanClass, String beanName) {
return null;
}
@Override
public boolean postProcessAfterInstantiation(Object bean, String beanName) {
return true;
}
@Override
public PropertyValues postProcessProperties(PropertyValues pvs, Object bean, String beanName) {
InjectionMetadata metadata = findResourceMetadata(beanName, bean.getClass(), pvs);
try {
metadata.inject(bean, beanName, pvs);
}
catch (Throwable ex) {
throw new BeanCreationException(beanName, "Injection of resource dependencies failed", ex);
}
return pvs;
}
private InjectionMetadata findResourceMetadata(String beanName, Class<?> clazz, @Nullable PropertyValues pvs) {
// Fall back to class name as cache key, for backwards compatibility with custom callers.
String cacheKey = (StringUtils.hasLength(beanName) ? beanName : clazz.getName());
// Quick check on the concurrent map first, with minimal locking.
InjectionMetadata metadata = this.injectionMetadataCache.get(cacheKey);
if (InjectionMetadata.needsRefresh(metadata, clazz)) {
synchronized (this.injectionMetadataCache) {
metadata = this.injectionMetadataCache.get(cacheKey);
if (InjectionMetadata.needsRefresh(metadata, clazz)) {
if (metadata != null) {
metadata.clear(pvs);
}
metadata = buildResourceMetadata(clazz);
this.injectionMetadataCache.put(cacheKey, metadata);
}
}
}
return metadata;
}
private InjectionMetadata buildResourceMetadata(Class<?> clazz) {
if (!AnnotationUtils.isCandidateClass(clazz, resourceAnnotationTypes)) {
return InjectionMetadata.EMPTY;
}
List<InjectionMetadata.InjectedElement> elements = new ArrayList<>();
Class<?> targetClass = clazz;
do {
final List<InjectionMetadata.InjectedElement> currElements = new ArrayList<>();
ReflectionUtils.doWithLocalFields(targetClass, field -> {
if (ejbClass != null && field.isAnnotationPresent(ejbClass)) {
if (Modifier.isStatic(field.getModifiers())) {
throw new IllegalStateException("@EJB annotation is not supported on static fields");
}
currElements.add(new EjbRefElement(field, field, null));
}
else if (field.isAnnotationPresent(Resource.class)) {
if (Modifier.isStatic(field.getModifiers())) {
throw new IllegalStateException("@Resource annotation is not supported on static fields");
}
if (!this.ignoredResourceTypes.contains(field.getType().getName())) {
currElements.add(new ResourceElement(field, field, null));
}
}
});
ReflectionUtils.doWithLocalMethods(targetClass, method -> {
Method bridgedMethod = BridgeMethodResolver.findBridgedMethod(method);
if (!BridgeMethodResolver.isVisibilityBridgeMethodPair(method, bridgedMethod)) {
return;
}
if (method.equals(ClassUtils.getMostSpecificMethod(method, clazz))) {
if (ejbClass != null && bridgedMethod.isAnnotationPresent(ejbClass)) {
if (Modifier.isStatic(method.getModifiers())) {
throw new IllegalStateException("@EJB annotation is not supported on static methods");
}
if (method.getParameterCount() != 1) {
throw new IllegalStateException("@EJB annotation requires a single-arg method: " + method);
}
PropertyDescriptor pd = BeanUtils.findPropertyForMethod(bridgedMethod, clazz);
currElements.add(new EjbRefElement(method, bridgedMethod, pd));
}
else if (bridgedMethod.isAnnotationPresent(Resource.class)) {
if (Modifier.isStatic(method.getModifiers())) {
throw new IllegalStateException("@Resource annotation is not supported on static methods");
}
Class<?>[] paramTypes = method.getParameterTypes();
if (paramTypes.length != 1) {
throw new IllegalStateException("@Resource annotation requires a single-arg method: " + method);
}
if (!this.ignoredResourceTypes.contains(paramTypes[0].getName())) {
PropertyDescriptor pd = BeanUtils.findPropertyForMethod(bridgedMethod, clazz);
currElements.add(new ResourceElement(method, bridgedMethod, pd));
}
}
}
});
elements.addAll(0, currElements);
targetClass = targetClass.getSuperclass();
}
while (targetClass != null && targetClass != Object.class);
return InjectionMetadata.forElements(elements, clazz);
}
/**
* Obtain a lazily resolving resource proxy for the given name and type,
* delegating to {@link #getResource} on demand once a method call comes in.
* @param element the descriptor for the annotated field/method
* @param requestingBeanName the name of the requesting bean
* @return the resource object (never {@code null})
* @since 4.2
* @see #getResource
* @see Lazy
*/
protected Object buildLazyResourceProxy(final LookupElement element, final @Nullable String requestingBeanName) {
TargetSource ts = new TargetSource() {
@Override
public Class<?> getTargetClass() {
return element.lookupType;
}
@Override
public boolean isStatic() {
return false;
}
@Override
public Object getTarget() {
return getResource(element, requestingBeanName);
}
@Override
public void releaseTarget(Object target) {
}
};
ProxyFactory pf = new ProxyFactory();
pf.setTargetSource(ts);
if (element.lookupType.isInterface()) {
pf.addInterface(element.lookupType);
}
ClassLoader classLoader = (this.beanFactory instanceof ConfigurableBeanFactory configurableBeanFactory ?
configurableBeanFactory.getBeanClassLoader() : null);
return pf.getProxy(classLoader);
}
/**
* Obtain the resource object for the given name and type.
* @param element the descriptor for the annotated field/method
* @param requestingBeanName the name of the requesting bean
* @return the resource object (never {@code null})
* @throws NoSuchBeanDefinitionException if no corresponding target resource found
*/
protected Object getResource(LookupElement element, @Nullable String requestingBeanName)
throws NoSuchBeanDefinitionException {
// JNDI lookup to perform?
String jndiName = null;
if (StringUtils.hasLength(element.mappedName)) {
jndiName = element.mappedName;
}
else if (this.alwaysUseJndiLookup) {
jndiName = element.name;
}
if (jndiName != null) {
if (this.jndiFactory == null) {
throw new NoSuchBeanDefinitionException(element.lookupType,
"No JNDI factory configured - specify the 'jndiFactory' property");
}
return this.jndiFactory.getBean(jndiName, element.lookupType);
}
// Regular resource autowiring
if (this.resourceFactory == null) {
throw new NoSuchBeanDefinitionException(element.lookupType,
"No resource factory configured - specify the 'resourceFactory' property");
}
return autowireResource(this.resourceFactory, element, requestingBeanName);
}
/**
* Obtain a resource object for the given name and type through autowiring
* based on the given factory.
* @param factory the factory to autowire against
* @param element the descriptor for the annotated field/method
* @param requestingBeanName the name of the requesting bean
* @return the resource object (never {@code null})
* @throws NoSuchBeanDefinitionException if no corresponding target resource found
*/
protected Object autowireResource(BeanFactory factory, LookupElement element, @Nullable String requestingBeanName)
throws NoSuchBeanDefinitionException {
Object resource;
Set<String> autowiredBeanNames;
String name = element.name;
if (factory instanceof AutowireCapableBeanFactory autowireCapableBeanFactory) {
DependencyDescriptor descriptor = element.getDependencyDescriptor();
if (this.fallbackToDefaultTypeMatch && element.isDefaultName && !factory.containsBean(name)) {
autowiredBeanNames = new LinkedHashSet<>();
resource = autowireCapableBeanFactory.resolveDependency(descriptor, requestingBeanName, autowiredBeanNames, null);
if (resource == null) {
throw new NoSuchBeanDefinitionException(element.getLookupType(), "No resolvable resource object");
}
}
else {
resource = autowireCapableBeanFactory.resolveBeanByName(name, descriptor);
autowiredBeanNames = Collections.singleton(name);
}
}
else {
resource = factory.getBean(name, element.lookupType);
autowiredBeanNames = Collections.singleton(name);
}
if (factory instanceof ConfigurableBeanFactory configurableBeanFactory) {
for (String autowiredBeanName : autowiredBeanNames) {
if (requestingBeanName != null && configurableBeanFactory.containsBean(autowiredBeanName)) {
configurableBeanFactory.registerDependentBean(autowiredBeanName, requestingBeanName);
}
}
}
return resource;
}
@SuppressWarnings("unchecked")
@Nullable
private static Class<? extends Annotation> loadAnnotationType(String name) {
try {
return (Class<? extends Annotation>)
ClassUtils.forName(name, CommonAnnotationBeanPostProcessor.class.getClassLoader());
}
catch (ClassNotFoundException ex) {
return null;
}
}
/**
* Class representing generic injection information about an annotated field
* or setter method, supporting @Resource and related annotations.
*/
protected abstract static class LookupElement extends InjectionMetadata.InjectedElement {
protected String name = "";
protected boolean isDefaultName = false;
protected Class<?> lookupType = Object.class;
@Nullable
protected String mappedName;
public LookupElement(Member member, @Nullable PropertyDescriptor pd) {
super(member, pd);
}
/**
* Return the resource name for the lookup.
*/
public final String getName() {
return this.name;
}
/**
* Return the desired type for the lookup.
*/
public final Class<?> getLookupType() {
return this.lookupType;
}
/**
* Build a DependencyDescriptor for the underlying field/method.
*/
public final DependencyDescriptor getDependencyDescriptor() {
if (this.isField) {
return new LookupDependencyDescriptor((Field) this.member, this.lookupType);
}
else {
return new LookupDependencyDescriptor((Method) this.member, this.lookupType);
}
}
}
/**
* Class representing injection information about an annotated field
* or setter method, supporting the @Resource annotation.
*/
private class ResourceElement extends LookupElement {
private final boolean lazyLookup;
public ResourceElement(Member member, AnnotatedElement ae, @Nullable PropertyDescriptor pd) {
super(member, pd);
Resource resource = ae.getAnnotation(Resource.class);
String resourceName = resource.name();
Class<?> resourceType = resource.type();
this.isDefaultName = !StringUtils.hasLength(resourceName);
if (this.isDefaultName) {
resourceName = this.member.getName();
if (this.member instanceof Method && resourceName.startsWith("set") && resourceName.length() > 3) {
resourceName = Introspector.decapitalize(resourceName.substring(3));
}
}
else if (embeddedValueResolver != null) {
resourceName = embeddedValueResolver.resolveStringValue(resourceName);
}
if (Object.class != resourceType) {
checkResourceType(resourceType);
}
else {
// No resource type specified... check field/method.
resourceType = getResourceType();
}
this.name = (resourceName != null ? resourceName : "");
this.lookupType = resourceType;
String lookupValue = resource.lookup();
this.mappedName = (StringUtils.hasLength(lookupValue) ? lookupValue : resource.mappedName());
Lazy lazy = ae.getAnnotation(Lazy.class);
this.lazyLookup = (lazy != null && lazy.value());
}
@Override
protected Object getResourceToInject(Object target, @Nullable String requestingBeanName) {
return (this.lazyLookup ? buildLazyResourceProxy(this, requestingBeanName) :
getResource(this, requestingBeanName));
}
}
/**
* Class representing injection information about an annotated field
* or setter method, supporting the @EJB annotation.
*/
private class EjbRefElement extends LookupElement {
private final String beanName;
public EjbRefElement(Member member, AnnotatedElement ae, @Nullable PropertyDescriptor pd) {
super(member, pd);
EJB resource = ae.getAnnotation(EJB.class);
String resourceBeanName = resource.beanName();
String resourceName = resource.name();
this.isDefaultName = !StringUtils.hasLength(resourceName);
if (this.isDefaultName) {
resourceName = this.member.getName();
if (this.member instanceof Method && resourceName.startsWith("set") && resourceName.length() > 3) {
resourceName = Introspector.decapitalize(resourceName.substring(3));
}
}
Class<?> resourceType = resource.beanInterface();
if (Object.class != resourceType) {
checkResourceType(resourceType);
}
else {
// No resource type specified... check field/method.
resourceType = getResourceType();
}
this.beanName = resourceBeanName;
this.name = resourceName;
this.lookupType = resourceType;
this.mappedName = resource.mappedName();
}
@Override
protected Object getResourceToInject(Object target, @Nullable String requestingBeanName) {
if (StringUtils.hasLength(this.beanName)) {
if (beanFactory != null && beanFactory.containsBean(this.beanName)) {
// Local match found for explicitly specified local bean name.
Object bean = beanFactory.getBean(this.beanName, this.lookupType);
if (requestingBeanName != null && beanFactory instanceof ConfigurableBeanFactory configurableBeanFactory) {
configurableBeanFactory.registerDependentBean(this.beanName, requestingBeanName);
}
return bean;
}
else if (this.isDefaultName && !StringUtils.hasLength(this.mappedName)) {
throw new NoSuchBeanDefinitionException(this.beanName,
"Cannot resolve 'beanName' in local BeanFactory. Consider specifying a general 'name' value instead.");
}
}
// JNDI name lookup - may still go to a local BeanFactory.
return getResource(this, requestingBeanName);
}
}
/**
* Extension of the DependencyDescriptor class,
* overriding the dependency type with the specified resource type.
*/
private static class LookupDependencyDescriptor extends DependencyDescriptor {
private final Class<?> lookupType;
public LookupDependencyDescriptor(Field field, Class<?> lookupType) {
super(field, true);
this.lookupType = lookupType;
}
public LookupDependencyDescriptor(Method method, Class<?> lookupType) {
super(new MethodParameter(method, 0), true);
this.lookupType = lookupType;
}
@Override
public Class<?> getDependencyType() {
return this.lookupType;
}
}
}
相关信息
相关文章
spring AdviceModeImportSelector 源码
spring AnnotatedBeanDefinitionReader 源码
spring AnnotationBeanNameGenerator 源码
spring AnnotationConfigApplicationContext 源码
spring AnnotationConfigBeanDefinitionParser 源码
spring AnnotationConfigRegistry 源码
spring AnnotationConfigUtils 源码
0
赞
热门推荐
-
2、 - 优质文章
-
3、 gate.io
-
6、 golang
-
7、 openharmony