org.springframework.context.annotation.AnnotatedBeanDefinitionReader Maven / Gradle / Ivy
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* Copyright 2002-2024 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.lang.annotation.Annotation;
import java.util.function.Supplier;
import org.springframework.beans.factory.annotation.AnnotatedGenericBeanDefinition;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.config.BeanDefinitionCustomizer;
import org.springframework.beans.factory.config.BeanDefinitionHolder;
import org.springframework.beans.factory.support.AutowireCandidateQualifier;
import org.springframework.beans.factory.support.BeanDefinitionReaderUtils;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.support.BeanNameGenerator;
import org.springframework.core.env.Environment;
import org.springframework.core.env.EnvironmentCapable;
import org.springframework.core.env.StandardEnvironment;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
/**
* Convenient adapter for programmatic registration of bean classes.
*
* This is an alternative to {@link ClassPathBeanDefinitionScanner}, applying
* the same resolution of annotations but for explicitly registered classes only.
*
* @author Juergen Hoeller
* @author Chris Beams
* @author Sam Brannen
* @author Phillip Webb
* @author Yanming Zhou
* @since 3.0
* @see AnnotationConfigApplicationContext#register
*/
public class AnnotatedBeanDefinitionReader {
private final BeanDefinitionRegistry registry;
private BeanNameGenerator beanNameGenerator = AnnotationBeanNameGenerator.INSTANCE;
private ScopeMetadataResolver scopeMetadataResolver = new AnnotationScopeMetadataResolver();
private ConditionEvaluator conditionEvaluator;
/**
* Create a new {@code AnnotatedBeanDefinitionReader} for the given registry.
*
If the registry is {@link EnvironmentCapable}, for example, is an {@code ApplicationContext},
* the {@link Environment} will be inherited, otherwise a new
* {@link StandardEnvironment} will be created and used.
* @param registry the {@code BeanFactory} to load bean definitions into,
* in the form of a {@code BeanDefinitionRegistry}
* @see #AnnotatedBeanDefinitionReader(BeanDefinitionRegistry, Environment)
* @see #setEnvironment(Environment)
*/
public AnnotatedBeanDefinitionReader(BeanDefinitionRegistry registry) {
this(registry, getOrCreateEnvironment(registry));
}
/**
* Create a new {@code AnnotatedBeanDefinitionReader} for the given registry,
* using the given {@link Environment}.
* @param registry the {@code BeanFactory} to load bean definitions into,
* in the form of a {@code BeanDefinitionRegistry}
* @param environment the {@code Environment} to use when evaluating bean definition
* profiles.
* @since 3.1
*/
public AnnotatedBeanDefinitionReader(BeanDefinitionRegistry registry, Environment environment) {
Assert.notNull(registry, "BeanDefinitionRegistry must not be null");
Assert.notNull(environment, "Environment must not be null");
this.registry = registry;
this.conditionEvaluator = new ConditionEvaluator(registry, environment, null);
AnnotationConfigUtils.registerAnnotationConfigProcessors(this.registry);
}
/**
* Get the BeanDefinitionRegistry that this reader operates on.
*/
public final BeanDefinitionRegistry getRegistry() {
return this.registry;
}
/**
* Set the {@code Environment} to use when evaluating whether
* {@link Conditional @Conditional}-annotated component classes should be registered.
*
The default is a {@link StandardEnvironment}.
*/
public void setEnvironment(Environment environment) {
this.conditionEvaluator = new ConditionEvaluator(this.registry, environment, null);
}
/**
* Set the {@code BeanNameGenerator} to use for detected bean classes.
*
The default is a {@link AnnotationBeanNameGenerator}.
*/
public void setBeanNameGenerator(@Nullable BeanNameGenerator beanNameGenerator) {
this.beanNameGenerator =
(beanNameGenerator != null ? beanNameGenerator : AnnotationBeanNameGenerator.INSTANCE);
}
/**
* Set the {@code ScopeMetadataResolver} to use for registered component classes.
*
The default is an {@link AnnotationScopeMetadataResolver}.
*/
public void setScopeMetadataResolver(@Nullable ScopeMetadataResolver scopeMetadataResolver) {
this.scopeMetadataResolver =
(scopeMetadataResolver != null ? scopeMetadataResolver : new AnnotationScopeMetadataResolver());
}
/**
* Register one or more component classes to be processed.
*
Calls to {@code register} are idempotent; adding the same
* component class more than once has no additional effect.
* @param componentClasses one or more component classes,
* for example, {@link Configuration @Configuration} classes
*/
public void register(Class... componentClasses) {
for (Class componentClass : componentClasses) {
registerBean(componentClass);
}
}
/**
* Register a bean from the given bean class, deriving its metadata from
* class-declared annotations.
* @param beanClass the class of the bean
*/
public void registerBean(Class beanClass) {
doRegisterBean(beanClass, null, null, null, null);
}
/**
* Register a bean from the given bean class, deriving its metadata from
* class-declared annotations.
* @param beanClass the class of the bean
* @param name an explicit name for the bean
* (or {@code null} for generating a default bean name)
* @since 5.2
*/
public void registerBean(Class beanClass, @Nullable String name) {
doRegisterBean(beanClass, name, null, null, null);
}
/**
* Register a bean from the given bean class, deriving its metadata from
* class-declared annotations.
* @param beanClass the class of the bean
* @param qualifiers specific qualifier annotations to consider,
* in addition to qualifiers at the bean class level
*/
@SuppressWarnings("unchecked")
public void registerBean(Class beanClass, Class... qualifiers) {
doRegisterBean(beanClass, null, qualifiers, null, null);
}
/**
* Register a bean from the given bean class, deriving its metadata from
* class-declared annotations.
* @param beanClass the class of the bean
* @param name an explicit name for the bean
* (or {@code null} for generating a default bean name)
* @param qualifiers specific qualifier annotations to consider,
* in addition to qualifiers at the bean class level
*/
@SuppressWarnings("unchecked")
public void registerBean(Class beanClass, @Nullable String name,
Class... qualifiers) {
doRegisterBean(beanClass, name, qualifiers, null, null);
}
/**
* Register a bean from the given bean class, deriving its metadata from
* class-declared annotations, using the given supplier for obtaining a new
* instance (possibly declared as a lambda expression or method reference).
* @param beanClass the class of the bean
* @param supplier a callback for creating an instance of the bean
* (may be {@code null})
* @since 5.0
*/
public void registerBean(Class beanClass, @Nullable Supplier supplier) {
doRegisterBean(beanClass, null, null, supplier, null);
}
/**
* Register a bean from the given bean class, deriving its metadata from
* class-declared annotations, using the given supplier for obtaining a new
* instance (possibly declared as a lambda expression or method reference).
* @param beanClass the class of the bean
* @param name an explicit name for the bean
* (or {@code null} for generating a default bean name)
* @param supplier a callback for creating an instance of the bean
* (may be {@code null})
* @since 5.0
*/
public void registerBean(Class beanClass, @Nullable String name, @Nullable Supplier supplier) {
doRegisterBean(beanClass, name, null, supplier, null);
}
/**
* Register a bean from the given bean class, deriving its metadata from
* class-declared annotations.
* @param beanClass the class of the bean
* @param name an explicit name for the bean
* (or {@code null} for generating a default bean name)
* @param supplier a callback for creating an instance of the bean
* (may be {@code null})
* @param customizers one or more callbacks for customizing the factory's
* {@link BeanDefinition}, for example, setting a lazy-init or primary flag
* @since 5.2
*/
public void registerBean(Class beanClass, @Nullable String name, @Nullable Supplier supplier,
BeanDefinitionCustomizer... customizers) {
doRegisterBean(beanClass, name, null, supplier, customizers);
}
/**
* Register a bean from the given bean class, deriving its metadata from
* class-declared annotations.
* @param beanClass the class of the bean
* @param name an explicit name for the bean
* @param qualifiers specific qualifier annotations to consider, if any,
* in addition to qualifiers at the bean class level
* @param supplier a callback for creating an instance of the bean
* (may be {@code null})
* @param customizers one or more callbacks for customizing the factory's
* {@link BeanDefinition}, for example, setting a lazy-init or primary flag
* @since 5.0
*/
private void doRegisterBean(Class beanClass, @Nullable String name,
@Nullable Class[] qualifiers, @Nullable Supplier supplier,
@Nullable BeanDefinitionCustomizer[] customizers) {
AnnotatedGenericBeanDefinition abd = new AnnotatedGenericBeanDefinition(beanClass);
if (this.conditionEvaluator.shouldSkip(abd.getMetadata())) {
return;
}
abd.setAttribute(ConfigurationClassUtils.CANDIDATE_ATTRIBUTE, Boolean.TRUE);
abd.setInstanceSupplier(supplier);
ScopeMetadata scopeMetadata = this.scopeMetadataResolver.resolveScopeMetadata(abd);
abd.setScope(scopeMetadata.getScopeName());
String beanName = (name != null ? name : this.beanNameGenerator.generateBeanName(abd, this.registry));
AnnotationConfigUtils.processCommonDefinitionAnnotations(abd);
if (qualifiers != null) {
for (Class qualifier : qualifiers) {
if (Primary.class == qualifier) {
abd.setPrimary(true);
}
else if (Fallback.class == qualifier) {
abd.setFallback(true);
}
else if (Lazy.class == qualifier) {
abd.setLazyInit(true);
}
else {
abd.addQualifier(new AutowireCandidateQualifier(qualifier));
}
}
}
if (customizers != null) {
for (BeanDefinitionCustomizer customizer : customizers) {
customizer.customize(abd);
}
}
BeanDefinitionHolder definitionHolder = new BeanDefinitionHolder(abd, beanName);
definitionHolder = AnnotationConfigUtils.applyScopedProxyMode(scopeMetadata, definitionHolder, this.registry);
BeanDefinitionReaderUtils.registerBeanDefinition(definitionHolder, this.registry);
}
/**
* Get the Environment from the given registry if possible, otherwise return a new
* StandardEnvironment.
*/
private static Environment getOrCreateEnvironment(BeanDefinitionRegistry registry) {
Assert.notNull(registry, "BeanDefinitionRegistry must not be null");
if (registry instanceof EnvironmentCapable environmentCapable) {
return environmentCapable.getEnvironment();
}
return new StandardEnvironment();
}
}