https://github.com/spring-projects/spring-framework: Spring Beans (Spring IO)
  • Juergen Hoeller 
/*
 * Copyright 2002-2018 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.beans.factory;

import java.lang.annotation.Annotation;
import java.util.Map;

import org.springframework.beans.BeansException;
import org.springframework.core.ResolvableType;
import org.springframework.lang.Nullable;


Extension of the BeanFactory interface to be implemented by bean factories that can enumerate all their bean instances, rather than attempting bean lookup by name one by one as requested by clients. BeanFactory implementations that preload all their bean definitions (such as XML-based factories) may implement this interface. 
If this is a HierarchicalBeanFactory, the return values will not take any BeanFactory hierarchy into account, but will relate only to the beans defined in the current factory. Use the BeanFactoryUtils helper class to consider beans in ancestor factories too. 
The methods in this interface will just respect bean definitions of this factory. They will ignore any singleton beans that have been registered by other means like ConfigurableBeanFactory's registerSingleton method, with the exception of getBeanNamesOfType and getBeansOfType which will check such manually registered singletons too. Of course, BeanFactory's getBean does allow transparent access to such special beans as well. However, in typical scenarios, all beans will be defined by external bean definitions anyway, so most applications don't need to worry about this differentiation. 
NOTE: With the exception of getBeanDefinitionCount and containsBeanDefinition, the methods in this interface are not designed for frequent invocation. Implementations may be slow. 
Author:Rod Johnson, Juergen Hoeller
See Also:
Since:16 April 2001
/**
 * Extension of the {@link BeanFactory} interface to be implemented by bean factories
 * that can enumerate all their bean instances, rather than attempting bean lookup
 * by name one by one as requested by clients. BeanFactory implementations that
 * preload all their bean definitions (such as XML-based factories) may implement
 * this interface.
 *
 * <p>If this is a {@link HierarchicalBeanFactory}, the return values will <i>not</i>
 * take any BeanFactory hierarchy into account, but will relate only to the beans
 * defined in the current factory. Use the {@link BeanFactoryUtils} helper class
 * to consider beans in ancestor factories too.
 *
 * <p>The methods in this interface will just respect bean definitions of this factory.
 * They will ignore any singleton beans that have been registered by other means like
 * {@link org.springframework.beans.factory.config.ConfigurableBeanFactory}'s
 * {@code registerSingleton} method, with the exception of
 * {@code getBeanNamesOfType} and {@code getBeansOfType} which will check
 * such manually registered singletons too. Of course, BeanFactory's {@code getBean}
 * does allow transparent access to such special beans as well. However, in typical
 * scenarios, all beans will be defined by external bean definitions anyway, so most
 * applications don't need to worry about this differentiation.
 *
 * <p><b>NOTE:</b> With the exception of {@code getBeanDefinitionCount}
 * and {@code containsBeanDefinition}, the methods in this interface
 * are not designed for frequent invocation. Implementations may be slow.
 *
 * @author Rod Johnson
 * @author Juergen Hoeller
 * @since 16 April 2001
 * @see HierarchicalBeanFactory
 * @see BeanFactoryUtils
 */
public interface ListableBeanFactory extends BeanFactory {

	
Check if this bean factory contains a bean definition with the given name.

Does not consider any hierarchy this factory may participate in,
and ignores any singleton beans that have been registered by
other means than bean definitions.

Params:
  • beanName – the name of the bean to look for
See Also:
Returns:if this bean factory contains a bean definition with the given name
/**
	 * Check if this bean factory contains a bean definition with the given name.
	 * <p>Does not consider any hierarchy this factory may participate in,
	 * and ignores any singleton beans that have been registered by
	 * other means than bean definitions.
	 * @param beanName the name of the bean to look for
	 * @return if this bean factory contains a bean definition with the given name
	 * @see #containsBean
	 */
	boolean containsBeanDefinition(String beanName);

	
Return the number of beans defined in the factory.

Does not consider any hierarchy this factory may participate in,
and ignores any singleton beans that have been registered by
other means than bean definitions.

Returns:the number of beans defined in the factory
/**
	 * Return the number of beans defined in the factory.
	 * <p>Does not consider any hierarchy this factory may participate in,
	 * and ignores any singleton beans that have been registered by
	 * other means than bean definitions.
	 * @return the number of beans defined in the factory
	 */
	int getBeanDefinitionCount();

	
Return the names of all beans defined in this factory.

Does not consider any hierarchy this factory may participate in,
and ignores any singleton beans that have been registered by
other means than bean definitions.

Returns:the names of all beans defined in this factory,
or an empty array if none defined
/**
	 * Return the names of all beans defined in this factory.
	 * <p>Does not consider any hierarchy this factory may participate in,
	 * and ignores any singleton beans that have been registered by
	 * other means than bean definitions.
	 * @return the names of all beans defined in this factory,
	 * or an empty array if none defined
	 */
	String[] getBeanDefinitionNames();

	
Return the names of beans matching the given type (including subclasses), judging from either bean definitions or the value of getObjectType in the case of FactoryBeans. 
NOTE: This method introspects top-level beans only. It does not
check nested beans which might match the specified type as well.

Does consider objects created by FactoryBeans, which means that FactoryBeans
will get initialized. If the object created by the FactoryBean doesn't match,
the raw FactoryBean itself will be matched against the type.

Does not consider any hierarchy this factory may participate in. Use BeanFactoryUtils' beanNamesForTypeIncludingAncestors to include beans in ancestor factories too. 
Note: Does not ignore singleton beans that have been registered
by other means than bean definitions.

This version of getBeanNamesForType matches all kinds of beans, be it singletons, prototypes, or FactoryBeans. In most implementations, the result will be the same as for getBeanNamesForType(type, true, true). 
Bean names returned by this method should always return bean names in the
order of definition in the backend configuration, as far as possible.

Params:
  • type – the generically typed class or interface to match
See Also:
Returns:the names of beans (or objects created by FactoryBeans) matching
the given object type (including subclasses), or an empty array if none
Since:4.2
/**
	 * Return the names of beans matching the given type (including subclasses),
	 * judging from either bean definitions or the value of {@code getObjectType}
	 * in the case of FactoryBeans.
	 * <p><b>NOTE: This method introspects top-level beans only.</b> It does <i>not</i>
	 * check nested beans which might match the specified type as well.
	 * <p>Does consider objects created by FactoryBeans, which means that FactoryBeans
	 * will get initialized. If the object created by the FactoryBean doesn't match,
	 * the raw FactoryBean itself will be matched against the type.
	 * <p>Does not consider any hierarchy this factory may participate in.
	 * Use BeanFactoryUtils' {@code beanNamesForTypeIncludingAncestors}
	 * to include beans in ancestor factories too.
	 * <p>Note: Does <i>not</i> ignore singleton beans that have been registered
	 * by other means than bean definitions.
	 * <p>This version of {@code getBeanNamesForType} matches all kinds of beans,
	 * be it singletons, prototypes, or FactoryBeans. In most implementations, the
	 * result will be the same as for {@code getBeanNamesForType(type, true, true)}.
	 * <p>Bean names returned by this method should always return bean names <i>in the
	 * order of definition</i> in the backend configuration, as far as possible.
	 * @param type the generically typed class or interface to match
	 * @return the names of beans (or objects created by FactoryBeans) matching
	 * the given object type (including subclasses), or an empty array if none
	 * @since 4.2
	 * @see #isTypeMatch(String, ResolvableType)
	 * @see FactoryBean#getObjectType
	 * @see BeanFactoryUtils#beanNamesForTypeIncludingAncestors(ListableBeanFactory, ResolvableType)
	 */
	String[] getBeanNamesForType(ResolvableType type);

	
Return the names of beans matching the given type (including subclasses), judging from either bean definitions or the value of getObjectType in the case of FactoryBeans. 
NOTE: This method introspects top-level beans only. It does not
check nested beans which might match the specified type as well.

Does consider objects created by FactoryBeans, which means that FactoryBeans
will get initialized. If the object created by the FactoryBean doesn't match,
the raw FactoryBean itself will be matched against the type.

Does not consider any hierarchy this factory may participate in. Use BeanFactoryUtils' beanNamesForTypeIncludingAncestors to include beans in ancestor factories too. 
Note: Does not ignore singleton beans that have been registered
by other means than bean definitions.

This version of getBeanNamesForType matches all kinds of beans, be it singletons, prototypes, or FactoryBeans. In most implementations, the result will be the same as for getBeanNamesForType(type, true, true). 
Bean names returned by this method should always return bean names in the
order of definition in the backend configuration, as far as possible.

Params:
  • type – the class or interface to match, or null for all bean names
See Also:
Returns:the names of beans (or objects created by FactoryBeans) matching
the given object type (including subclasses), or an empty array if none
/**
	 * Return the names of beans matching the given type (including subclasses),
	 * judging from either bean definitions or the value of {@code getObjectType}
	 * in the case of FactoryBeans.
	 * <p><b>NOTE: This method introspects top-level beans only.</b> It does <i>not</i>
	 * check nested beans which might match the specified type as well.
	 * <p>Does consider objects created by FactoryBeans, which means that FactoryBeans
	 * will get initialized. If the object created by the FactoryBean doesn't match,
	 * the raw FactoryBean itself will be matched against the type.
	 * <p>Does not consider any hierarchy this factory may participate in.
	 * Use BeanFactoryUtils' {@code beanNamesForTypeIncludingAncestors}
	 * to include beans in ancestor factories too.
	 * <p>Note: Does <i>not</i> ignore singleton beans that have been registered
	 * by other means than bean definitions.
	 * <p>This version of {@code getBeanNamesForType} matches all kinds of beans,
	 * be it singletons, prototypes, or FactoryBeans. In most implementations, the
	 * result will be the same as for {@code getBeanNamesForType(type, true, true)}.
	 * <p>Bean names returned by this method should always return bean names <i>in the
	 * order of definition</i> in the backend configuration, as far as possible.
	 * @param type the class or interface to match, or {@code null} for all bean names
	 * @return the names of beans (or objects created by FactoryBeans) matching
	 * the given object type (including subclasses), or an empty array if none
	 * @see FactoryBean#getObjectType
	 * @see BeanFactoryUtils#beanNamesForTypeIncludingAncestors(ListableBeanFactory, Class)
	 */
	String[] getBeanNamesForType(@Nullable Class<?> type);

	
Return the names of beans matching the given type (including subclasses), judging from either bean definitions or the value of getObjectType in the case of FactoryBeans. 
NOTE: This method introspects top-level beans only. It does not
check nested beans which might match the specified type as well.

Does consider objects created by FactoryBeans if the "allowEagerInit" flag is set,
which means that FactoryBeans will get initialized. If the object created by the
FactoryBean doesn't match, the raw FactoryBean itself will be matched against the
type. If "allowEagerInit" is not set, only raw FactoryBeans will be checked
(which doesn't require initialization of each FactoryBean).

Does not consider any hierarchy this factory may participate in. Use BeanFactoryUtils' beanNamesForTypeIncludingAncestors to include beans in ancestor factories too. 
Note: Does not ignore singleton beans that have been registered
by other means than bean definitions.

Bean names returned by this method should always return bean names in the
order of definition in the backend configuration, as far as possible.

Params:
  • type – the class or interface to match, or null for all bean names
  • includeNonSingletons – whether to include prototype or scoped beans too
or just singletons (also applies to FactoryBeans)
  • allowEagerInit – whether to initialize lazy-init singletons and
objects created by FactoryBeans (or by factory methods with a
"factory-bean" reference) for the type check. Note that FactoryBeans need to be
eagerly initialized to determine their type: So be aware that passing in "true"
for this flag will initialize FactoryBeans and "factory-bean" references.
See Also:
Returns:the names of beans (or objects created by FactoryBeans) matching
the given object type (including subclasses), or an empty array if none
/**
	 * Return the names of beans matching the given type (including subclasses),
	 * judging from either bean definitions or the value of {@code getObjectType}
	 * in the case of FactoryBeans.
	 * <p><b>NOTE: This method introspects top-level beans only.</b> It does <i>not</i>
	 * check nested beans which might match the specified type as well.
	 * <p>Does consider objects created by FactoryBeans if the "allowEagerInit" flag is set,
	 * which means that FactoryBeans will get initialized. If the object created by the
	 * FactoryBean doesn't match, the raw FactoryBean itself will be matched against the
	 * type. If "allowEagerInit" is not set, only raw FactoryBeans will be checked
	 * (which doesn't require initialization of each FactoryBean).
	 * <p>Does not consider any hierarchy this factory may participate in.
	 * Use BeanFactoryUtils' {@code beanNamesForTypeIncludingAncestors}
	 * to include beans in ancestor factories too.
	 * <p>Note: Does <i>not</i> ignore singleton beans that have been registered
	 * by other means than bean definitions.
	 * <p>Bean names returned by this method should always return bean names <i>in the
	 * order of definition</i> in the backend configuration, as far as possible.
	 * @param type the class or interface to match, or {@code null} for all bean names
	 * @param includeNonSingletons whether to include prototype or scoped beans too
	 * or just singletons (also applies to FactoryBeans)
	 * @param allowEagerInit whether to initialize <i>lazy-init singletons</i> and
	 * <i>objects created by FactoryBeans</i> (or by factory methods with a
	 * "factory-bean" reference) for the type check. Note that FactoryBeans need to be
	 * eagerly initialized to determine their type: So be aware that passing in "true"
	 * for this flag will initialize FactoryBeans and "factory-bean" references.
	 * @return the names of beans (or objects created by FactoryBeans) matching
	 * the given object type (including subclasses), or an empty array if none
	 * @see FactoryBean#getObjectType
	 * @see BeanFactoryUtils#beanNamesForTypeIncludingAncestors(ListableBeanFactory, Class, boolean, boolean)
	 */
	String[] getBeanNamesForType(@Nullable Class<?> type, boolean includeNonSingletons, boolean allowEagerInit);

	
Return the bean instances that match the given object type (including subclasses), judging from either bean definitions or the value of getObjectType in the case of FactoryBeans. 
NOTE: This method introspects top-level beans only. It does not
check nested beans which might match the specified type as well.

Does consider objects created by FactoryBeans, which means that FactoryBeans
will get initialized. If the object created by the FactoryBean doesn't match,
the raw FactoryBean itself will be matched against the type.

Does not consider any hierarchy this factory may participate in. Use BeanFactoryUtils' beansOfTypeIncludingAncestors to include beans in ancestor factories too. 
Note: Does not ignore singleton beans that have been registered
by other means than bean definitions.

This version of getBeansOfType matches all kinds of beans, be it singletons, prototypes, or FactoryBeans. In most implementations, the result will be the same as for getBeansOfType(type, true, true). 
The Map returned by this method should always return bean names and
corresponding bean instances in the order of definition in the
backend configuration, as far as possible.

Params:
  • type – the class or interface to match, or null for all concrete beans
Throws:
See Also:
Returns:a Map with the matching beans, containing the bean names as
keys and the corresponding bean instances as values
Since:1.1.2
/**
	 * Return the bean instances that match the given object type (including
	 * subclasses), judging from either bean definitions or the value of
	 * {@code getObjectType} in the case of FactoryBeans.
	 * <p><b>NOTE: This method introspects top-level beans only.</b> It does <i>not</i>
	 * check nested beans which might match the specified type as well.
	 * <p>Does consider objects created by FactoryBeans, which means that FactoryBeans
	 * will get initialized. If the object created by the FactoryBean doesn't match,
	 * the raw FactoryBean itself will be matched against the type.
	 * <p>Does not consider any hierarchy this factory may participate in.
	 * Use BeanFactoryUtils' {@code beansOfTypeIncludingAncestors}
	 * to include beans in ancestor factories too.
	 * <p>Note: Does <i>not</i> ignore singleton beans that have been registered
	 * by other means than bean definitions.
	 * <p>This version of getBeansOfType matches all kinds of beans, be it
	 * singletons, prototypes, or FactoryBeans. In most implementations, the
	 * result will be the same as for {@code getBeansOfType(type, true, true)}.
	 * <p>The Map returned by this method should always return bean names and
	 * corresponding bean instances <i>in the order of definition</i> in the
	 * backend configuration, as far as possible.
	 * @param type the class or interface to match, or {@code null} for all concrete beans
	 * @return a Map with the matching beans, containing the bean names as
	 * keys and the corresponding bean instances as values
	 * @throws BeansException if a bean could not be created
	 * @since 1.1.2
	 * @see FactoryBean#getObjectType
	 * @see BeanFactoryUtils#beansOfTypeIncludingAncestors(ListableBeanFactory, Class)
	 */
	<T> Map<String, T> getBeansOfType(@Nullable Class<T> type) throws BeansException;

	
Return the bean instances that match the given object type (including subclasses), judging from either bean definitions or the value of getObjectType in the case of FactoryBeans. 
NOTE: This method introspects top-level beans only. It does not
check nested beans which might match the specified type as well.

Does consider objects created by FactoryBeans if the "allowEagerInit" flag is set,
which means that FactoryBeans will get initialized. If the object created by the
FactoryBean doesn't match, the raw FactoryBean itself will be matched against the
type. If "allowEagerInit" is not set, only raw FactoryBeans will be checked
(which doesn't require initialization of each FactoryBean).

Does not consider any hierarchy this factory may participate in. Use BeanFactoryUtils' beansOfTypeIncludingAncestors to include beans in ancestor factories too. 
Note: Does not ignore singleton beans that have been registered
by other means than bean definitions.

The Map returned by this method should always return bean names and
corresponding bean instances in the order of definition in the
backend configuration, as far as possible.

Params:
  • type – the class or interface to match, or null for all concrete beans
  • includeNonSingletons – whether to include prototype or scoped beans too
or just singletons (also applies to FactoryBeans)
  • allowEagerInit – whether to initialize lazy-init singletons and
objects created by FactoryBeans (or by factory methods with a
"factory-bean" reference) for the type check. Note that FactoryBeans need to be
eagerly initialized to determine their type: So be aware that passing in "true"
for this flag will initialize FactoryBeans and "factory-bean" references.
Throws:
See Also:
Returns:a Map with the matching beans, containing the bean names as
keys and the corresponding bean instances as values
/**
	 * Return the bean instances that match the given object type (including
	 * subclasses), judging from either bean definitions or the value of
	 * {@code getObjectType} in the case of FactoryBeans.
	 * <p><b>NOTE: This method introspects top-level beans only.</b> It does <i>not</i>
	 * check nested beans which might match the specified type as well.
	 * <p>Does consider objects created by FactoryBeans if the "allowEagerInit" flag is set,
	 * which means that FactoryBeans will get initialized. If the object created by the
	 * FactoryBean doesn't match, the raw FactoryBean itself will be matched against the
	 * type. If "allowEagerInit" is not set, only raw FactoryBeans will be checked
	 * (which doesn't require initialization of each FactoryBean).
	 * <p>Does not consider any hierarchy this factory may participate in.
	 * Use BeanFactoryUtils' {@code beansOfTypeIncludingAncestors}
	 * to include beans in ancestor factories too.
	 * <p>Note: Does <i>not</i> ignore singleton beans that have been registered
	 * by other means than bean definitions.
	 * <p>The Map returned by this method should always return bean names and
	 * corresponding bean instances <i>in the order of definition</i> in the
	 * backend configuration, as far as possible.
	 * @param type the class or interface to match, or {@code null} for all concrete beans
	 * @param includeNonSingletons whether to include prototype or scoped beans too
	 * or just singletons (also applies to FactoryBeans)
	 * @param allowEagerInit whether to initialize <i>lazy-init singletons</i> and
	 * <i>objects created by FactoryBeans</i> (or by factory methods with a
	 * "factory-bean" reference) for the type check. Note that FactoryBeans need to be
	 * eagerly initialized to determine their type: So be aware that passing in "true"
	 * for this flag will initialize FactoryBeans and "factory-bean" references.
	 * @return a Map with the matching beans, containing the bean names as
	 * keys and the corresponding bean instances as values
	 * @throws BeansException if a bean could not be created
	 * @see FactoryBean#getObjectType
	 * @see BeanFactoryUtils#beansOfTypeIncludingAncestors(ListableBeanFactory, Class, boolean, boolean)
	 */
	<T> Map<String, T> getBeansOfType(@Nullable Class<T> type, boolean includeNonSingletons, boolean allowEagerInit)
			throws BeansException;

	
Find all names of beans whose Class has the supplied Annotation type, without creating corresponding bean instances yet. 
Note that this method considers objects created by FactoryBeans, which means
that FactoryBeans will get initialized in order to determine their object type.

Params:
  • annotationType – the type of annotation to look for
Returns:the names of all matching beans
Since:4.0
/**
	 * Find all names of beans whose {@code Class} has the supplied {@link Annotation}
	 * type, without creating corresponding bean instances yet.
	 * <p>Note that this method considers objects created by FactoryBeans, which means
	 * that FactoryBeans will get initialized in order to determine their object type.
	 * @param annotationType the type of annotation to look for
	 * @return the names of all matching beans
	 * @since 4.0
	 */
	String[] getBeanNamesForAnnotation(Class<? extends Annotation> annotationType);

	
Find all beans whose Class has the supplied Annotation type, returning a Map of bean names with corresponding bean instances. 
Note that this method considers objects created by FactoryBeans, which means
that FactoryBeans will get initialized in order to determine their object type.

Params:
  • annotationType – the type of annotation to look for
Throws:
Returns:a Map with the matching beans, containing the bean names as
keys and the corresponding bean instances as values
Since:3.0
/**
	 * Find all beans whose {@code Class} has the supplied {@link Annotation} type,
	 * returning a Map of bean names with corresponding bean instances.
	 * <p>Note that this method considers objects created by FactoryBeans, which means
	 * that FactoryBeans will get initialized in order to determine their object type.
	 * @param annotationType the type of annotation to look for
	 * @return a Map with the matching beans, containing the bean names as
	 * keys and the corresponding bean instances as values
	 * @throws BeansException if a bean could not be created
	 * @since 3.0
	 */
	Map<String, Object> getBeansWithAnnotation(Class<? extends Annotation> annotationType) throws BeansException;

	
Find an Annotation of annotationType on the specified bean, traversing its interfaces and super classes if no annotation can be found on the given class itself. 
Params:
  • beanName – the name of the bean to look for annotations on
  • annotationType – the annotation class to look for
Throws:
Returns:the annotation of the given type if found, or null otherwise
Since:3.0
/**
	 * Find an {@link Annotation} of {@code annotationType} on the specified
	 * bean, traversing its interfaces and super classes if no annotation can be
	 * found on the given class itself.
	 * @param beanName the name of the bean to look for annotations on
	 * @param annotationType the annotation class to look for
	 * @return the annotation of the given type if found, or {@code null} otherwise
	 * @throws NoSuchBeanDefinitionException if there is no bean with the given name
	 * @since 3.0
	 */
	@Nullable
	<A extends Annotation> A findAnnotationOnBean(String beanName, Class<A> annotationType)
			throws NoSuchBeanDefinitionException;

}