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/*
* Copyright 2002-2015 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
*
* http://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.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.factory.BeanDefinitionStoreException;
import org.springframework.beans.factory.annotation.AnnotatedBeanDefinition;
import org.springframework.beans.factory.annotation.AnnotatedGenericBeanDefinition;
import org.springframework.beans.factory.annotation.Autowire;
import org.springframework.beans.factory.annotation.RequiredAnnotationBeanPostProcessor;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.config.BeanDefinitionHolder;
import org.springframework.beans.factory.groovy.GroovyBeanDefinitionReader;
import org.springframework.beans.factory.parsing.SourceExtractor;
import org.springframework.beans.factory.support.AbstractBeanDefinitionReader;
import org.springframework.beans.factory.support.BeanDefinitionReader;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.support.BeanNameGenerator;
import org.springframework.beans.factory.support.DefaultListableBeanFactory;
import org.springframework.beans.factory.support.RootBeanDefinition;
import org.springframework.beans.factory.xml.XmlBeanDefinitionReader;
import org.springframework.context.annotation.ConfigurationCondition.ConfigurationPhase;
import org.springframework.core.annotation.AnnotationAttributes;
import org.springframework.core.env.Environment;
import org.springframework.core.io.Resource;
import org.springframework.core.io.ResourceLoader;
import org.springframework.core.type.AnnotationMetadata;
import org.springframework.core.type.MethodMetadata;
import org.springframework.util.StringUtils;
/**
* Reads a given fully-populated set of ConfigurationClass instances, registering bean
* definitions with the given {@link BeanDefinitionRegistry} based on its contents.
*
* This class was modeled after the {@link BeanDefinitionReader} hierarchy, but does
* not implement/extend any of its artifacts as a set of configuration classes is not a
* {@link Resource}.
*
* @author Chris Beams
* @author Juergen Hoeller
* @author Phillip Webb
* @author Sam Brannen
* @since 3.0
* @see ConfigurationClassParser
*/
class ConfigurationClassBeanDefinitionReader {
private static final Log logger = LogFactory.getLog(ConfigurationClassBeanDefinitionReader.class);
private static final ScopeMetadataResolver scopeMetadataResolver = new AnnotationScopeMetadataResolver();
private final BeanDefinitionRegistry registry;
private final SourceExtractor sourceExtractor;
private final ResourceLoader resourceLoader;
private final Environment environment;
private final BeanNameGenerator importBeanNameGenerator;
private final ImportRegistry importRegistry;
private final ConditionEvaluator conditionEvaluator;
/**
* Create a new {@link ConfigurationClassBeanDefinitionReader} instance that will be used
* to populate the given {@link BeanDefinitionRegistry}.
*/
ConfigurationClassBeanDefinitionReader(BeanDefinitionRegistry registry, SourceExtractor sourceExtractor,
ResourceLoader resourceLoader, Environment environment, BeanNameGenerator importBeanNameGenerator,
ImportRegistry importRegistry) {
this.registry = registry;
this.sourceExtractor = sourceExtractor;
this.resourceLoader = resourceLoader;
this.environment = environment;
this.importBeanNameGenerator = importBeanNameGenerator;
this.importRegistry = importRegistry;
this.conditionEvaluator = new ConditionEvaluator(registry, environment, resourceLoader);
}
/**
* Read {@code configurationModel}, registering bean definitions
* with the registry based on its contents.
*/
public void loadBeanDefinitions(Set configurationModel) {
TrackedConditionEvaluator trackedConditionEvaluator = new TrackedConditionEvaluator();
for (ConfigurationClass configClass : configurationModel) {
loadBeanDefinitionsForConfigurationClass(configClass, trackedConditionEvaluator);
}
}
/**
* Read a particular {@link ConfigurationClass}, registering bean definitions
* for the class itself and all of its {@link Bean} methods.
*/
private void loadBeanDefinitionsForConfigurationClass(ConfigurationClass configClass,
TrackedConditionEvaluator trackedConditionEvaluator) {
if (trackedConditionEvaluator.shouldSkip(configClass)) {
String beanName = configClass.getBeanName();
if (StringUtils.hasLength(beanName) && this.registry.containsBeanDefinition(beanName)) {
this.registry.removeBeanDefinition(beanName);
}
this.importRegistry.removeImportingClassFor(configClass.getMetadata().getClassName());
return;
}
if (configClass.isImported()) {
registerBeanDefinitionForImportedConfigurationClass(configClass);
}
for (BeanMethod beanMethod : configClass.getBeanMethods()) {
loadBeanDefinitionsForBeanMethod(beanMethod);
}
loadBeanDefinitionsFromImportedResources(configClass.getImportedResources());
loadBeanDefinitionsFromRegistrars(configClass.getImportBeanDefinitionRegistrars());
}
/**
* Register the {@link Configuration} class itself as a bean definition.
*/
private void registerBeanDefinitionForImportedConfigurationClass(ConfigurationClass configClass) {
AnnotationMetadata metadata = configClass.getMetadata();
AnnotatedGenericBeanDefinition configBeanDef = new AnnotatedGenericBeanDefinition(metadata);
ScopeMetadata scopeMetadata = scopeMetadataResolver.resolveScopeMetadata(configBeanDef);
configBeanDef.setScope(scopeMetadata.getScopeName());
String configBeanName = this.importBeanNameGenerator.generateBeanName(configBeanDef, this.registry);
AnnotationConfigUtils.processCommonDefinitionAnnotations(configBeanDef, metadata);
BeanDefinitionHolder definitionHolder = new BeanDefinitionHolder(configBeanDef, configBeanName);
definitionHolder = AnnotationConfigUtils.applyScopedProxyMode(scopeMetadata, definitionHolder, this.registry);
this.registry.registerBeanDefinition(definitionHolder.getBeanName(), definitionHolder.getBeanDefinition());
configClass.setBeanName(configBeanName);
if (logger.isDebugEnabled()) {
logger.debug("Registered bean definition for imported class '" + configBeanName + "'");
}
}
/**
* Read the given {@link BeanMethod}, registering bean definitions
* with the BeanDefinitionRegistry based on its contents.
*/
private void loadBeanDefinitionsForBeanMethod(BeanMethod beanMethod) {
ConfigurationClass configClass = beanMethod.getConfigurationClass();
MethodMetadata metadata = beanMethod.getMetadata();
String methodName = metadata.getMethodName();
// Do we need to mark the bean as skipped by its condition?
if (this.conditionEvaluator.shouldSkip(metadata, ConfigurationPhase.REGISTER_BEAN)) {
configClass.skippedBeanMethods.add(methodName);
return;
}
if (configClass.skippedBeanMethods.contains(methodName)) {
return;
}
// Consider name and any aliases
AnnotationAttributes bean = AnnotationConfigUtils.attributesFor(metadata, Bean.class);
List names = new ArrayList(Arrays.asList(bean.getStringArray("name")));
String beanName = (names.size() > 0 ? names.remove(0) : methodName);
// Register aliases even when overridden
for (String alias : names) {
this.registry.registerAlias(beanName, alias);
}
// Has this effectively been overridden before (e.g. via XML)?
if (isOverriddenByExistingDefinition(beanMethod, beanName)) {
return;
}
ConfigurationClassBeanDefinition beanDef = new ConfigurationClassBeanDefinition(configClass, metadata);
beanDef.setResource(configClass.getResource());
beanDef.setSource(this.sourceExtractor.extractSource(metadata, configClass.getResource()));
if (metadata.isStatic()) {
// static @Bean method
beanDef.setBeanClassName(configClass.getMetadata().getClassName());
beanDef.setFactoryMethodName(methodName);
}
else {
// instance @Bean method
beanDef.setFactoryBeanName(configClass.getBeanName());
beanDef.setUniqueFactoryMethodName(methodName);
}
beanDef.setAutowireMode(RootBeanDefinition.AUTOWIRE_CONSTRUCTOR);
beanDef.setAttribute(RequiredAnnotationBeanPostProcessor.SKIP_REQUIRED_CHECK_ATTRIBUTE, Boolean.TRUE);
AnnotationConfigUtils.processCommonDefinitionAnnotations(beanDef, metadata);
Autowire autowire = bean.getEnum("autowire");
if (autowire.isAutowire()) {
beanDef.setAutowireMode(autowire.value());
}
String initMethodName = bean.getString("initMethod");
if (StringUtils.hasText(initMethodName)) {
beanDef.setInitMethodName(initMethodName);
}
String destroyMethodName = bean.getString("destroyMethod");
if (destroyMethodName != null) {
beanDef.setDestroyMethodName(destroyMethodName);
}
// Consider scoping
ScopedProxyMode proxyMode = ScopedProxyMode.NO;
AnnotationAttributes attributes = AnnotationConfigUtils.attributesFor(metadata, Scope.class);
if (attributes != null) {
beanDef.setScope(attributes.getAliasedString("value", Scope.class, configClass.getResource()));
proxyMode = attributes.getEnum("proxyMode");
if (proxyMode == ScopedProxyMode.DEFAULT) {
proxyMode = ScopedProxyMode.NO;
}
}
// Replace the original bean definition with the target one, if necessary
BeanDefinition beanDefToRegister = beanDef;
if (proxyMode != ScopedProxyMode.NO) {
BeanDefinitionHolder proxyDef = ScopedProxyCreator.createScopedProxy(
new BeanDefinitionHolder(beanDef, beanName), this.registry, proxyMode == ScopedProxyMode.TARGET_CLASS);
beanDefToRegister = new ConfigurationClassBeanDefinition(
(RootBeanDefinition) proxyDef.getBeanDefinition(), configClass, metadata);
}
if (logger.isDebugEnabled()) {
logger.debug(String.format("Registering bean definition for @Bean method %s.%s()",
configClass.getMetadata().getClassName(), beanName));
}
this.registry.registerBeanDefinition(beanName, beanDefToRegister);
}
protected boolean isOverriddenByExistingDefinition(BeanMethod beanMethod, String beanName) {
if (!this.registry.containsBeanDefinition(beanName)) {
return false;
}
BeanDefinition existingBeanDef = this.registry.getBeanDefinition(beanName);
// Is the existing bean definition one that was created from a configuration class?
// -> allow the current bean method to override, since both are at second-pass level.
// However, if the bean method is an overloaded case on the same configuration class,
// preserve the existing bean definition.
if (existingBeanDef instanceof ConfigurationClassBeanDefinition) {
ConfigurationClassBeanDefinition ccbd = (ConfigurationClassBeanDefinition) existingBeanDef;
return (ccbd.getMetadata().getClassName().equals(beanMethod.getConfigurationClass().getMetadata().getClassName()));
}
// A bean definition resulting from a component scan can be silently overridden
// by an @Bean method, as of 4.2...
if (existingBeanDef instanceof ScannedGenericBeanDefinition) {
return false;
}
// Has the existing bean definition bean marked as a framework-generated bean?
// -> allow the current bean method to override it, since it is application-level
if (existingBeanDef.getRole() > BeanDefinition.ROLE_APPLICATION) {
return false;
}
// At this point, it's a top-level override (probably XML), just having been parsed
// before configuration class processing kicks in...
if (this.registry instanceof DefaultListableBeanFactory &&
!((DefaultListableBeanFactory) this.registry).isAllowBeanDefinitionOverriding()) {
throw new BeanDefinitionStoreException(beanMethod.getConfigurationClass().getResource().getDescription(),
beanName, "@Bean definition illegally overridden by existing bean definition: " + existingBeanDef);
}
if (logger.isInfoEnabled()) {
logger.info(String.format("Skipping bean definition for %s: a definition for bean '%s' " +
"already exists. This top-level bean definition is considered as an override.",
beanMethod, beanName));
}
return true;
}
private void loadBeanDefinitionsFromImportedResources(
Map> importedResources) {
Map, BeanDefinitionReader> readerInstanceCache = new HashMap, BeanDefinitionReader>();
for (Map.Entry> entry : importedResources.entrySet()) {
String resource = entry.getKey();
Class readerClass = entry.getValue();
// Default reader selection necessary?
if (BeanDefinitionReader.class == readerClass) {
if (StringUtils.endsWithIgnoreCase(resource, ".groovy")) {
// When clearly asking for Groovy, that's what they'll get...
readerClass = GroovyBeanDefinitionReader.class;
}
else {
// Primarily ".xml" files but for any other extension as well
readerClass = XmlBeanDefinitionReader.class;
}
}
BeanDefinitionReader reader = readerInstanceCache.get(readerClass);
if (reader == null) {
try {
// Instantiate the specified BeanDefinitionReader
reader = readerClass.getConstructor(BeanDefinitionRegistry.class).newInstance(this.registry);
// Delegate the current ResourceLoader to it if possible
if (reader instanceof AbstractBeanDefinitionReader) {
AbstractBeanDefinitionReader abdr = ((AbstractBeanDefinitionReader) reader);
abdr.setResourceLoader(this.resourceLoader);
abdr.setEnvironment(this.environment);
}
readerInstanceCache.put(readerClass, reader);
}
catch (Exception ex) {
throw new IllegalStateException(
"Could not instantiate BeanDefinitionReader class [" + readerClass.getName() + "]");
}
}
// TODO SPR-6310: qualify relative path locations as done in AbstractContextLoader.modifyLocations
reader.loadBeanDefinitions(resource);
}
}
private void loadBeanDefinitionsFromRegistrars(Map registrars) {
for (Map.Entry entry : registrars.entrySet()) {
entry.getKey().registerBeanDefinitions(entry.getValue(), this.registry);
}
}
/**
* {@link RootBeanDefinition} marker subclass used to signify that a bean definition
* was created from a configuration class as opposed to any other configuration source.
* Used in bean overriding cases where it's necessary to determine whether the bean
* definition was created externally.
*/
@SuppressWarnings("serial")
private static class ConfigurationClassBeanDefinition extends RootBeanDefinition implements AnnotatedBeanDefinition {
private final AnnotationMetadata annotationMetadata;
private final MethodMetadata factoryMethodMetadata;
public ConfigurationClassBeanDefinition(ConfigurationClass configClass, MethodMetadata beanMethodMetadata) {
this.annotationMetadata = configClass.getMetadata();
this.factoryMethodMetadata = beanMethodMetadata;
setLenientConstructorResolution(false);
}
public ConfigurationClassBeanDefinition(
RootBeanDefinition original, ConfigurationClass configClass, MethodMetadata beanMethodMetadata) {
super(original);
this.annotationMetadata = configClass.getMetadata();
this.factoryMethodMetadata = beanMethodMetadata;
}
private ConfigurationClassBeanDefinition(ConfigurationClassBeanDefinition original) {
super(original);
this.annotationMetadata = original.annotationMetadata;
this.factoryMethodMetadata = original.factoryMethodMetadata;
}
@Override
public AnnotationMetadata getMetadata() {
return this.annotationMetadata;
}
@Override
public MethodMetadata getFactoryMethodMetadata() {
return this.factoryMethodMetadata;
}
@Override
public boolean isFactoryMethod(Method candidate) {
return (super.isFactoryMethod(candidate) && BeanAnnotationHelper.isBeanAnnotated(candidate));
}
@Override
public ConfigurationClassBeanDefinition cloneBeanDefinition() {
return new ConfigurationClassBeanDefinition(this);
}
}
/**
* Evaluate {@code @Conditional} annotations, tracking results and taking into
* account 'imported by'.
*/
private class TrackedConditionEvaluator {
private final Map skipped = new HashMap();
public boolean shouldSkip(ConfigurationClass configClass) {
Boolean skip = this.skipped.get(configClass);
if (skip == null) {
if (configClass.isImported()) {
boolean allSkipped = true;
for (ConfigurationClass importedBy : configClass.getImportedBy()) {
if (!shouldSkip(importedBy)) {
allSkipped = false;
break;
}
}
if (allSkipped) {
// The config classes that imported this one were all skipped, therefore we are skipped...
skip = true;
}
}
if (skip == null) {
skip = conditionEvaluator.shouldSkip(configClass.getMetadata(), ConfigurationPhase.REGISTER_BEAN);
}
this.skipped.put(configClass, skip);
}
return skip;
}
}
}