spring bean自动装配
说到spring自动装配的bean大伙都比较了解，@Autowired不就完了么。哈哈，今天我在review的时候发现了这个问题，小伙伴看下代码：
@Bean public List<PlatformCheck> platformCheckList() { Map<String, PlatformCheck> result = applicationContext.getBeansOfType(PlatformCheck.class); List<PlatformCheck> list = new ArrayList<>(result.values()); list.sort(Comparator.comparingInt(PlatformCheck::getOrder)); for (int i = 0; i < list.size(); i++) { PlatformCheck platformCheck = list.get(i); log.info("PlatformCheck类：{} 已经加载, order：{}", platformCheck.getClass().getName(), platformCheck.getOrder()); } return list; }
上面代码配置一个bean
@Component public class AuthenticationHandler { private final Logger log = LoggerFactory.getLogger(AuthenticationHandler.class); @Autowiredpublic List<PlatformCheck> platformCheckList; public List<Function<ContextBridge, Boolean>> loginContextInitialization; @Autowired public LoginContextCollection loginContextCollection;
上面的代码将配置的bean自动注入进来。上面的程序会正确运行么？
突然看上去其实就有些心里疑问的，List<PlatformCheck>一定会被注册进来；但是注册究竟是不是上面配置的名为platformCheckList这个bean呢。
答案在这：
populateBean 默认6个beanPostProcess的第5个：AutowiredAnnotationBeanPostProcessor#postProcessProperties AutowiredAnnotationBeanPostProcessor#findAutowiringMetadata AutowiredAnnotationBeanPostProcessor#inject方法中开始遍历成员变量，开始真正的注入流程。 public void inject(Object target, @Nullable String beanName, @Nullable PropertyValues pvs) throws Throwable { Collection<InjectedElement> checkedElements = this.checkedElements; Collection<InjectedElement> elementsToIterate = (checkedElements != null ? checkedElements : this.injectedElements); if (!elementsToIterate.isEmpty()) { for (InjectedElement element : elementsToIterate) { if (logger.isTraceEnabled()) { logger.trace("Processing injected element of bean '" + beanName + "': " + element); } element.inject(target, beanName, pvs); } } } 还会进入第二个AutowiredAnnotationBeanPostProcessor#inject方法： @Override protected void inject(Object bean, @Nullable String beanName, @Nullable PropertyValues pvs) throws Throwable { Field field = (Field) this.member; Object value; if (this.cached) { value = resolvedCachedArgument(beanName, this.cachedFieldValue); } else { DependencyDescriptor desc = new DependencyDescriptor(field, this.required); desc.setContainingClass(bean.getClass()); Set<String> autowiredBeanNames = new LinkedHashSet<>(1); Assert.state(beanFactory != null, "No BeanFactory available"); TypeConverter typeConverter = beanFactory.getTypeConverter(); try { value = beanFactory.resolveDependency(desc, beanName, autowiredBeanNames, typeConverter); } catch (BeansException ex) { throw new UnsatisfiedDependencyException(null, beanName, new InjectionPoint(field), ex); } synchronized (this) { if (!this.cached) { if (value != null || this.required) { this.cachedFieldValue = desc; registerDependentBeans(beanName, autowiredBeanNames); if (autowiredBeanNames.size() == 1) { String autowiredBeanName = autowiredBeanNames.iterator().next(); if (beanFactory.containsBean(autowiredBeanName) && beanFactory.isTypeMatch(autowiredBeanName, field.getType())) { this.cachedFieldValue = new ShortcutDependencyDescriptor( desc, autowiredBeanName, field.getType()); } } } else { this.cachedFieldValue = null; } this.cached = true; } } } if (value != null) { ReflectionUtils.makeAccessible(field); field.set(bean, value); } } } DefaultListableBeanFactory#resolveDependency，进入else。 public Object resolveDependency(DependencyDescriptor descriptor, @Nullable String requestingBeanName, @Nullable Set<String> 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; } } DefaultListableBeanFactory#doResolveDependency，进入之后会判断当前的属性的类型： public Object doResolveDependency(DependencyDescriptor descriptor, @Nullable String beanName, @Nullable Set<String> 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);//调用这里 if (multipleBeans != null) { return multipleBeans; } Map<String, Object> 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<String, Object> 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); } } DefaultListableBeanFactory#resolveMultipleBeans，进入如果是List就会去找多个bean进行匹配： private Object resolveMultipleBeans(DependencyDescriptor descriptor, @Nullable String beanName, @Nullable Set<String> autowiredBeanNames, @Nullable TypeConverter typeConverter) { final Class<?> type = descriptor.getDependencyType(); if (descriptor instanceof StreamDependencyDescriptor) { Map<String, Object> matchingBeans = findAutowireCandidates(beanName, type, descriptor); if (autowiredBeanNames != null) { autowiredBeanNames.addAll(matchingBeans.keySet()); } Stream<Object> 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<String, Object> 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<Object> comparator = adaptDependencyComparator(matchingBeans); if (comparator != null) { Arrays.sort((Object[]) result, comparator); } } return result; } else if (Collection.class.isAssignableFrom(type) && type.isInterface()) {//这里执行 Class<?> elementType = descriptor.getResolvableType().asCollection().resolveGeneric(); if (elementType == null) { return null; } Map<String, Object> matchingBeans = findAutowireCandidates(beanName, elementType, new MultiElementDescriptor(descriptor));//在这里调用 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<Object> 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<String, Object> matchingBeans = findAutowireCandidates(beanName, valueType, new MultiElementDescriptor(descriptor)); if (matchingBeans.isEmpty()) { return null; } if (autowiredBeanNames != null) { autowiredBeanNames.addAll(matchingBeans.keySet()); } return matchingBeans; } else { return null; } } DefaultListableBeanFactory#findAutowireCandidates，寻找自动注入的后续bean protected Map<String, Object> findAutowireCandidates( @Nullable String beanName, Class<?> requiredType, DependencyDescriptor descriptor) { String[] candidateNames = BeanFactoryUtils.beanNamesForTypeIncludingAncestors( this, requiredType, true, descriptor.isEager()); Map<String, Object> result = new LinkedHashMap<>(candidateNames.length); for (Map.Entry<Class<?>, 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; } doResolveDependency核心逻辑还是看下这里，如果是List类型接口装配，使用指定具体bean名称，Object multipleBeans = resolveMultipleBeans这个方法会返回null 那么接下来会在Map<String, Object> matchingBeans = findAutowireCandidates(beanName, type, descriptor);方法中找到实际的bean的名称去装配。 如果没有指定bean的名称进行装配，代码就会走到findAutowireCandidates方法的这个位置： for (String candidate : candidateNames) { if (!isSelfReference(beanName, candidate) && isAutowireCandidate(candidate, descriptor)) { addCandidateEntry(result, candidate, descriptor, requiredType); } } 那么有几个类型，就会被add进List。
