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DefaultListableBeanFactory does not trigger early candidate creation ahead of primary bean selection 

Issue: SPR-14611
This commit is contained in:
Juergen Hoeller 2016-08-24 22:56:47 +02:00
parent 405e74b6ae
commit c4fcdb6864
4 changed files with 121 additions and 88 deletions
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176
spring-beans/src/main/java/org/springframework/beans/factory/support/DefaultListableBeanFactory.java
View File

@ -976,38 +976,47 @@ public class DefaultListableBeanFactory extends AbstractAutowireCapableBeanFacto
return null;
}
@SuppressWarnings("unchecked")
private <T> NamedBeanHolder<T> resolveNamedBean(Class<T> requiredType, Object... args) throws BeansException {
Assert.notNull(requiredType, "Required type must not be null");
String[] beanNames = getBeanNamesForType(requiredType);
String[] candidateNames = getBeanNamesForType(requiredType);
if (beanNames.length > 1) {
if (candidateNames.length > 1) {
ArrayList<String> autowireCandidates = new ArrayList<>();
for (String beanName : beanNames) {
for (String beanName : candidateNames) {
if (!containsBeanDefinition(beanName) || getBeanDefinition(beanName).isAutowireCandidate()) {
autowireCandidates.add(beanName);
}
}
if (!autowireCandidates.isEmpty()) {
beanNames = autowireCandidates.toArray(new String[autowireCandidates.size()]);
candidateNames = autowireCandidates.toArray(new String[autowireCandidates.size()]);
}
}
if (beanNames.length == 1) {
String beanName = beanNames[0];
if (candidateNames.length == 1) {
String beanName = candidateNames[0];
return new NamedBeanHolder<>(beanName, getBean(beanName, requiredType, args));
}
else if (beanNames.length > 1) {
Map<String, Object> candidates = new LinkedHashMap<>();
for (String beanName : beanNames) {
candidates.put(beanName, getBean(beanName, requiredType, args));
else if (candidateNames.length > 1) {
Map<String, Object> candidates = new LinkedHashMap<>(candidateNames.length);
for (String candidateName : candidateNames) {
if (containsSingleton(candidateName)) {
candidates.put(candidateName, getBean(candidateName, requiredType, args));
}
else {
candidates.put(candidateName, getType(candidateName));
}
}
String primaryCandidate = determinePrimaryCandidate(candidates, requiredType);
if (primaryCandidate != null) {
return new NamedBeanHolder<>(primaryCandidate, getBean(primaryCandidate, requiredType, args));
String candidateName = determinePrimaryCandidate(candidates, requiredType);
if (candidateName == null) {
candidateName = determineHighestPriorityCandidate(candidates, requiredType);
}
String priorityCandidate = determineHighestPriorityCandidate(candidates, requiredType);
if (priorityCandidate != null) {
return new NamedBeanHolder<>(priorityCandidate, getBean(priorityCandidate, requiredType, args));
if (candidateName != null) {
Object beanInstance = candidates.get(candidateName);
if (beanInstance instanceof Class) {
beanInstance = getBean(candidateName, requiredType, args);
}
return new NamedBeanHolder<>(candidateName, (T) beanInstance);
}
throw new NoUniqueBeanDefinitionException(requiredType, candidates.keySet());
}
@ -1076,9 +1085,13 @@ public class DefaultListableBeanFactory extends AbstractAutowireCapableBeanFacto
}
return null;
}
String autowiredBeanName;
Object instanceCandidate;
if (matchingBeans.size() > 1) {
String primaryBeanName = determineAutowireCandidate(matchingBeans, descriptor);
if (primaryBeanName == null) {
autowiredBeanName = determineAutowireCandidate(matchingBeans, descriptor);
if (autowiredBeanName == null) {
if (descriptor.isRequired() || !indicatesMultipleBeans(type)) {
return descriptor.resolveNotUnique(type, matchingBeans);
}
@ -1089,17 +1102,20 @@ public class DefaultListableBeanFactory extends AbstractAutowireCapableBeanFacto
return null;
}
}
if (autowiredBeanNames != null) {
autowiredBeanNames.add(primaryBeanName);
}
return matchingBeans.get(primaryBeanName);
instanceCandidate = matchingBeans.get(autowiredBeanName);
}
// We have exactly one match.
Map.Entry<String, Object> entry = matchingBeans.entrySet().iterator().next();
else {
// We have exactly one match.
Map.Entry<String, Object> entry = matchingBeans.entrySet().iterator().next();
autowiredBeanName = entry.getKey();
instanceCandidate = entry.getValue();
}
if (autowiredBeanNames != null) {
autowiredBeanNames.add(entry.getKey());
autowiredBeanNames.add(autowiredBeanName);
}
return entry.getValue();
return (instanceCandidate instanceof Class ?
descriptor.resolveCandidate(autowiredBeanName, type, this) : instanceCandidate);
}
finally {
ConstructorResolver.setCurrentInjectionPoint(previousInjectionPoint);
@ -1112,9 +1128,8 @@ public class DefaultListableBeanFactory extends AbstractAutowireCapableBeanFacto
Class<?> type = descriptor.getDependencyType();
if (type.isArray()) {
Class<?> componentType = type.getComponentType();
DependencyDescriptor targetDesc = new DependencyDescriptor(descriptor);
targetDesc.increaseNestingLevel();
Map<String, Object> matchingBeans = findAutowireCandidates(beanName, componentType, targetDesc);
Map<String, Object> matchingBeans = findAutowireCandidates(beanName, componentType,
new MultiElementDependencyDescriptor(descriptor));
if (matchingBeans.isEmpty()) {
return null;
}
@ -1133,9 +1148,8 @@ public class DefaultListableBeanFactory extends AbstractAutowireCapableBeanFacto
if (elementType == null) {
return null;
}
DependencyDescriptor targetDesc = new DependencyDescriptor(descriptor);
targetDesc.increaseNestingLevel();
Map<String, Object> matchingBeans = findAutowireCandidates(beanName, elementType, targetDesc);
Map<String, Object> matchingBeans = findAutowireCandidates(beanName, elementType,
new MultiElementDependencyDescriptor(descriptor));
if (matchingBeans.isEmpty()) {
return null;
}
@ -1158,9 +1172,8 @@ public class DefaultListableBeanFactory extends AbstractAutowireCapableBeanFacto
if (valueType == null) {
return null;
}
DependencyDescriptor targetDesc = new DependencyDescriptor(descriptor);
targetDesc.increaseNestingLevel();
Map<String, Object> matchingBeans = findAutowireCandidates(beanName, valueType, targetDesc);
Map<String, Object> matchingBeans = findAutowireCandidates(beanName, valueType,
new MultiElementDependencyDescriptor(descriptor));
if (matchingBeans.isEmpty()) {
return null;
}
@ -1229,7 +1242,7 @@ public class DefaultListableBeanFactory extends AbstractAutowireCapableBeanFacto
}
for (String candidateName : candidateNames) {
if (!isSelfReference(beanName, candidateName) && isAutowireCandidate(candidateName, descriptor)) {
result.put(candidateName, descriptor.resolveCandidate(candidateName, requiredType, this));
addCandidateEntry(result, candidateName, descriptor, requiredType);
}
}
if (result.isEmpty() && !indicatesMultipleBeans(requiredType)) {
@ -1237,14 +1250,14 @@ public class DefaultListableBeanFactory extends AbstractAutowireCapableBeanFacto
DependencyDescriptor fallbackDescriptor = descriptor.forFallbackMatch();
for (String candidateName : candidateNames) {
if (!isSelfReference(beanName, candidateName) && isAutowireCandidate(candidateName, fallbackDescriptor)) {
result.put(candidateName, descriptor.resolveCandidate(candidateName, requiredType, this));
addCandidateEntry(result, candidateName, descriptor, requiredType);
}
}
if (result.isEmpty()) {
// Consider self references before as a final pass
for (String candidateName : candidateNames) {
if (isSelfReference(beanName, candidateName) && isAutowireCandidate(candidateName, fallbackDescriptor)) {
result.put(candidateName, descriptor.resolveCandidate(candidateName, requiredType, this));
addCandidateEntry(result, candidateName, descriptor, requiredType);
}
}
}
@ -1252,31 +1265,46 @@ public class DefaultListableBeanFactory extends AbstractAutowireCapableBeanFacto
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<String, Object> candidates, String candidateName,
DependencyDescriptor descriptor, Class<?> requiredType) {
if (descriptor instanceof MultiElementDependencyDescriptor || containsSingleton(candidateName)) {
candidates.put(candidateName, descriptor.resolveCandidate(candidateName, requiredType, this));
}
else {
candidates.put(candidateName, getType(candidateName));
}
}
/**
* Determine the autowire candidate in the given set of beans.
* <p>Looks for {@code @Primary} and {@code @Priority} (in that order).
* @param candidateBeans a Map of candidate names and candidate instances
* @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
*/
protected String determineAutowireCandidate(Map<String, Object> candidateBeans, DependencyDescriptor descriptor) {
protected String determineAutowireCandidate(Map<String, Object> candidates, DependencyDescriptor descriptor) {
Class<?> requiredType = descriptor.getDependencyType();
String primaryCandidate = determinePrimaryCandidate(candidateBeans, requiredType);
String primaryCandidate = determinePrimaryCandidate(candidates, requiredType);
if (primaryCandidate != null) {
return primaryCandidate;
}
String priorityCandidate = determineHighestPriorityCandidate(candidateBeans, requiredType);
String priorityCandidate = determineHighestPriorityCandidate(candidates, requiredType);
if (priorityCandidate != null) {
return priorityCandidate;
}
// Fallback
for (Map.Entry<String, Object> entry : candidateBeans.entrySet()) {
String candidateBeanName = entry.getKey();
for (Map.Entry<String, Object> entry : candidates.entrySet()) {
String candidateName = entry.getKey();
Object beanInstance = entry.getValue();
if ((beanInstance != null && this.resolvableDependencies.containsValue(beanInstance)) ||
matchesBeanName(candidateBeanName, descriptor.getDependencyName())) {
return candidateBeanName;
matchesBeanName(candidateName, descriptor.getDependencyName())) {
return candidateName;
}
}
return null;
@ -1284,15 +1312,15 @@ public class DefaultListableBeanFactory extends AbstractAutowireCapableBeanFacto
/**
* Determine the primary candidate in the given set of beans.
* @param candidateBeans a Map of candidate names and candidate instances
* that match the required type
* @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)
*/
protected String determinePrimaryCandidate(Map<String, Object> candidateBeans, Class<?> requiredType) {
protected String determinePrimaryCandidate(Map<String, Object> candidates, Class<?> requiredType) {
String primaryBeanName = null;
for (Map.Entry<String, Object> entry : candidateBeans.entrySet()) {
for (Map.Entry<String, Object> entry : candidates.entrySet()) {
String candidateBeanName = entry.getKey();
Object beanInstance = entry.getValue();
if (isPrimary(candidateBeanName, beanInstance)) {
@ -1300,8 +1328,8 @@ public class DefaultListableBeanFactory extends AbstractAutowireCapableBeanFacto
boolean candidateLocal = containsBeanDefinition(candidateBeanName);
boolean primaryLocal = containsBeanDefinition(primaryBeanName);
if (candidateLocal && primaryLocal) {
throw new NoUniqueBeanDefinitionException(requiredType, candidateBeans.size(),
"more than one 'primary' bean found among candidates: " + candidateBeans.keySet());
throw new NoUniqueBeanDefinitionException(requiredType, candidates.size(),
"more than one 'primary' bean found among candidates: " + candidates.keySet());
}
else if (candidateLocal) {
primaryBeanName = candidateBeanName;
@ -1316,29 +1344,30 @@ public class DefaultListableBeanFactory extends AbstractAutowireCapableBeanFacto
}
/**
* Determine the candidate with the highest priority in the given set of beans. As
* defined by the {@link org.springframework.core.Ordered} interface, the lowest
* value has the highest priority.
* @param candidateBeans a Map of candidate names and candidate instances
* that match the required type
* Determine the candidate with the highest priority in the given set of beans.
* <p>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)
*/
protected String determineHighestPriorityCandidate(Map<String, Object> candidateBeans, Class<?> requiredType) {
protected String determineHighestPriorityCandidate(Map<String, Object> candidates, Class<?> requiredType) {
String highestPriorityBeanName = null;
Integer highestPriority = null;
for (Map.Entry<String, Object> entry : candidateBeans.entrySet()) {
for (Map.Entry<String, Object> entry : candidates.entrySet()) {
String candidateBeanName = entry.getKey();
Object beanInstance = entry.getValue();
Integer candidatePriority = getPriority(beanInstance);
if (candidatePriority != null) {
if (highestPriorityBeanName != null) {
if (candidatePriority.equals(highestPriority)) {
throw new NoUniqueBeanDefinitionException(requiredType, candidateBeans.size(),
"Multiple beans found with the same priority ('" + highestPriority + "') " +
"among candidates: " + candidateBeans.keySet());
throw new NoUniqueBeanDefinitionException(requiredType, candidates.size(),
"Multiple beans found with the same priority ('" + highestPriority +
"') among candidates: " + candidates.keySet());
}
else if (candidatePriority < highestPriority) {
highestPriorityBeanName = candidateBeanName;
@ -1453,7 +1482,7 @@ public class DefaultListableBeanFactory extends AbstractAutowireCapableBeanFacto
* Create an {@link Optional} wrapper for the specified dependency.
*/
private Optional<?> createOptionalDependency(DependencyDescriptor descriptor, String beanName, final Object... args) {
DependencyDescriptor descriptorToUse = new DependencyDescriptor(descriptor) {
DependencyDescriptor descriptorToUse = new NestedDependencyDescriptor(descriptor) {
@Override
public boolean isRequired() {
return false;
@ -1464,7 +1493,6 @@ public class DefaultListableBeanFactory extends AbstractAutowireCapableBeanFacto
super.resolveCandidate(beanName, requiredType, beanFactory));
}
};
descriptorToUse.increaseNestingLevel();
return Optional.ofNullable(doResolveDependency(descriptorToUse, beanName, null, null));
}
@ -1543,8 +1571,7 @@ public class DefaultListableBeanFactory extends AbstractAutowireCapableBeanFacto
private final String beanName;
public DependencyObjectProvider(DependencyDescriptor descriptor, String beanName) {
this.descriptor = new DependencyDescriptor(descriptor);
this.descriptor.increaseNestingLevel();
this.descriptor = new NestedDependencyDescriptor(descriptor);
this.optional = (this.descriptor.getDependencyType() == Optional.class);
this.beanName = beanName;
}
@ -1684,4 +1711,21 @@ public class DefaultListableBeanFactory extends AbstractAutowireCapableBeanFacto
}
}
private static class NestedDependencyDescriptor extends DependencyDescriptor {
public NestedDependencyDescriptor(DependencyDescriptor original) {
super(original);
increaseNestingLevel();
}
}
private static class MultiElementDependencyDescriptor extends NestedDependencyDescriptor {
public MultiElementDependencyDescriptor(DependencyDescriptor original) {
super(original);
}
}
}

20
spring-beans/src/test/java/org/springframework/beans/factory/DefaultListableBeanFactoryTests.java
View File

@ -1435,12 +1435,14 @@ public class DefaultListableBeanFactoryTests {
public void testGetBeanByTypeWithPrimary() throws Exception {
DefaultListableBeanFactory lbf = new DefaultListableBeanFactory();
RootBeanDefinition bd1 = new RootBeanDefinition(TestBean.class);
bd1.setLazyInit(true);
RootBeanDefinition bd2 = new RootBeanDefinition(TestBean.class);
bd2.setPrimary(true);
lbf.registerBeanDefinition("bd1", bd1);
lbf.registerBeanDefinition("bd2", bd2);
TestBean bean = lbf.getBean(TestBean.class);
assertThat(bean.getBeanName(), equalTo("bd2"));
assertFalse(lbf.containsSingleton("bd1"));
}
@Test
@ -1760,24 +1762,6 @@ public class DefaultListableBeanFactoryTests {
}
}
@Test
public void testAutowireBeanByTypeWithTwoMatchesAndParameterNameDiscovery() {
DefaultListableBeanFactory lbf = new DefaultListableBeanFactory();
RootBeanDefinition bd = new RootBeanDefinition(TestBean.class);
RootBeanDefinition bd2 = new RootBeanDefinition(TestBean.class);
lbf.registerBeanDefinition("test", bd);
lbf.registerBeanDefinition("spouse", bd2);
try {
lbf.autowire(DependenciesBean.class, AutowireCapableBeanFactory.AUTOWIRE_BY_TYPE, true);
fail("Should have thrown UnsatisfiedDependencyException");
}
catch (UnsatisfiedDependencyException ex) {
// expected
assertTrue(ex.getMessage().contains("test"));
assertTrue(ex.getMessage().contains("spouse"));
}
}
@Test
public void testAutowireBeanByTypeWithDependencyCheck() {
DefaultListableBeanFactory lbf = new DefaultListableBeanFactory();

5
spring-beans/src/test/java/org/springframework/beans/factory/annotation/AutowiredAnnotationBeanPostProcessorTests.java
View File

@ -1146,12 +1146,15 @@ public class AutowiredAnnotationBeanPostProcessorTests {
RootBeanDefinition tb1 = new RootBeanDefinition(TestBean.class);
tb1.setPrimary(true);
bf.registerBeanDefinition("testBean1", tb1);
bf.registerBeanDefinition("testBean2", new RootBeanDefinition(TestBean.class));
RootBeanDefinition tb2 = new RootBeanDefinition(TestBean.class);
tb2.setLazyInit(true);
bf.registerBeanDefinition("testBean2", tb2);
SmartObjectFactoryInjectionBean bean = (SmartObjectFactoryInjectionBean) bf.getBean("annotatedBean");
assertSame(bf.getBean("testBean1"), bean.getTestBean());
assertSame(bf.getBean("testBean1"), bean.getOptionalTestBean());
assertSame(bf.getBean("testBean1"), bean.getUniqueTestBean());
assertFalse(bf.containsSingleton("testBean2"));
bf.destroySingletons();
}

8
spring-core/src/main/java/org/springframework/core/annotation/OrderUtils.java
View File

@ -1,5 +1,5 @@
/*
* Copyright 2002-2014 the original author or authors.
* Copyright 2002-2016 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.
@ -48,9 +48,10 @@ public abstract class OrderUtils {
/**
* Return the order on the specified {@code type}.
* <p>Take care of {@link Order @Order} and {@code @javax.annotation.Priority}.
* <p>Takes care of {@link Order @Order} and {@code @javax.annotation.Priority}.
* @param type the type to handle
* @return the order value, or {@code null} if none can be found
* @see #getPriority(Class)
*/
public static Integer getOrder(Class<?> type) {
return getOrder(type, null);
@ -59,9 +60,10 @@ public abstract class OrderUtils {
/**
* Return the order on the specified {@code type}, or the specified
* default value if none can be found.
* <p>Take care of {@link Order @Order} and {@code @javax.annotation.Priority}.
* <p>Takes care of {@link Order @Order} and {@code @javax.annotation.Priority}.
* @param type the type to handle
* @return the priority value, or the specified default order if none can be found
* @see #getPriority(Class)
*/
public static Integer getOrder(Class<?> type, Integer defaultOrder) {
Order order = AnnotationUtils.findAnnotation(type, Order.class);