org.springframework.context.support

Class AbstractApplicationContext

java.lang.Object

org.springframework.core.io.DefaultResourceLoader

org.springframework.context.support.AbstractApplicationContext

All Implemented Interfaces:

Closeable, AutoCloseable, BeanFactory, DisposableBean, HierarchicalBeanFactory, ListableBeanFactory, ApplicationContext, ApplicationEventPublisher, ConfigurableApplicationContext, Lifecycle, MessageSource, EnvironmentCapable, ResourceLoader, ResourcePatternResolver

Direct Known Subclasses:

AbstractRefreshableApplicationContext, GenericApplicationContext

public abstract class AbstractApplicationContext
extends DefaultResourceLoader
implements ConfigurableApplicationContext, DisposableBean

Abstract implementation of the ApplicationContext interface. Doesn't mandate the type of storage used for configuration; simply implements common context functionality. Uses the Template Method design pattern, requiring concrete subclasses to implement abstract methods.

In contrast to a plain BeanFactory, an ApplicationContext is supposed to detect special beans defined in its internal bean factory: Therefore, this class automatically registers BeanFactoryPostProcessors, BeanPostProcessors and ApplicationListeners which are defined as beans in the context.

A MessageSource may also be supplied as a bean in the context, with the name "messageSource"; otherwise, message resolution is delegated to the parent context. Furthermore, a multicaster for application events can be supplied as "applicationEventMulticaster" bean of type ApplicationEventMulticaster in the context; otherwise, a default multicaster of type SimpleApplicationEventMulticaster will be used.

Implements resource loading through extending DefaultResourceLoader. Consequently treats non-URL resource paths as class path resources (supporting full class path resource names that include the package path, e.g. "mypackage/myresource.dat"), unless the DefaultResourceLoader.getResourceByPath(java.lang.String) method is overwritten in a subclass.

Since:

January 21, 2001

Author:

Rod Johnson, Juergen Hoeller, Mark Fisher

See Also:

refreshBeanFactory(), getBeanFactory(), BeanFactoryPostProcessor, BeanPostProcessor, ApplicationEventMulticaster, ApplicationListener, MessageSource

Nested Class Summary

Nested classes/interfaces inherited from class org.springframework.core.io.DefaultResourceLoader

DefaultResourceLoader.ClassPathContextResource

Field Summary

Fields

Modifier and Type	Field and Description
static String	APPLICATION_EVENT_MULTICASTER_BEAN_NAME Name of the ApplicationEventMulticaster bean in the factory.
static String	LIFECYCLE_PROCESSOR_BEAN_NAME Name of the LifecycleProcessor bean in the factory.
protected Log	logger Logger used by this class.
static String	MESSAGE_SOURCE_BEAN_NAME Name of the MessageSource bean in the factory.

Fields inherited from interface org.springframework.context.ConfigurableApplicationContext

CONFIG_LOCATION_DELIMITERS, CONVERSION_SERVICE_BEAN_NAME, ENVIRONMENT_BEAN_NAME, LOAD_TIME_WEAVER_BEAN_NAME, SYSTEM_ENVIRONMENT_BEAN_NAME, SYSTEM_PROPERTIES_BEAN_NAME

Fields inherited from interface org.springframework.beans.factory.BeanFactory

FACTORY_BEAN_PREFIX

Fields inherited from interface org.springframework.core.io.support.ResourcePatternResolver

CLASSPATH_ALL_URL_PREFIX

Fields inherited from interface org.springframework.core.io.ResourceLoader

CLASSPATH_URL_PREFIX

Constructor Summary

Constructors

Constructor and Description
AbstractApplicationContext() Create a new AbstractApplicationContext with no parent.
AbstractApplicationContext(ApplicationContext parent) Create a new AbstractApplicationContext with the given parent context.

Method Summary

Modifier and Type	Method and Description
void	addApplicationListener(ApplicationListener<?> listener) Add a new ApplicationListener that will be notified on context events such as context refresh and context shutdown.
void	addBeanFactoryPostProcessor(BeanFactoryPostProcessor beanFactoryPostProcessor) Add a new BeanFactoryPostProcessor that will get applied to the internal bean factory of this application context on refresh, before any of the bean definitions get evaluated.
protected void	assertBeanFactoryActive() Assert that this context's BeanFactory is currently active, throwing an IllegalStateException if it isn't.
protected void	cancelRefresh(BeansException ex) Cancel this context's refresh attempt, resetting the active flag after an exception got thrown.
void	close() Close this application context, destroying all beans in its bean factory.
protected abstract void	closeBeanFactory() Subclasses must implement this method to release their internal bean factory.
boolean	containsBean(String name) Does this bean factory contain a bean definition or externally registered singleton instance with the given name?
boolean	containsBeanDefinition(String beanName) Check if this bean factory contains a bean definition with the given name.
boolean	containsLocalBean(String name) Return whether the local bean factory contains a bean of the given name, ignoring beans defined in ancestor contexts.
protected ConfigurableEnvironment	createEnvironment() Create and return a new StandardEnvironment.
void	destroy() DisposableBean callback for destruction of this instance.
protected void	destroyBeans() Template method for destroying all beans that this context manages.
protected void	doClose() Actually performs context closing: publishes a ContextClosedEvent and destroys the singletons in the bean factory of this application context.
<A extends Annotation> A	findAnnotationOnBean(String beanName, Class<A> annotationType) 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.
protected void	finishBeanFactoryInitialization(ConfigurableListableBeanFactory beanFactory) Finish the initialization of this context's bean factory, initializing all remaining singleton beans.
protected void	finishRefresh() Finish the refresh of this context, invoking the LifecycleProcessor's onRefresh() method and publishing the ContextRefreshedEvent.
String[]	getAliases(String name) Return the aliases for the given bean name, if any.
Collection<ApplicationListener<?>>	getApplicationListeners() Return the list of statically specified ApplicationListeners.
String	getApplicationName() Return a name for the deployed application that this context belongs to.
AutowireCapableBeanFactory	getAutowireCapableBeanFactory() Return this context's internal bean factory as AutowireCapableBeanFactory, if already available.
<T> T	getBean(Class<T> requiredType) Return the bean instance that uniquely matches the given object type, if any.
Object	getBean(String name) Return an instance, which may be shared or independent, of the specified bean.
<T> T	getBean(String name, Class<T> requiredType) Return an instance, which may be shared or independent, of the specified bean.
Object	getBean(String name, Object... args) Return an instance, which may be shared or independent, of the specified bean.
int	getBeanDefinitionCount() Return the number of beans defined in the factory.
String[]	getBeanDefinitionNames() Return the names of all beans defined in this factory.
abstract ConfigurableListableBeanFactory	getBeanFactory() Subclasses must return their internal bean factory here.
List<BeanFactoryPostProcessor>	getBeanFactoryPostProcessors() Return the list of BeanFactoryPostProcessors that will get applied to the internal BeanFactory.
String[]	getBeanNamesForAnnotation(Class<? extends Annotation> annotationType) Find all names of beans whose Class has the supplied Annotation type, without creating any bean instances yet.
String[]	getBeanNamesForType(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.
String[]	getBeanNamesForType(Class<?> type, boolean includeNonSingletons, boolean allowEagerInit) 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.
<T> Map<String,T>	getBeansOfType(Class<T> type) 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.
<T> Map<String,T>	getBeansOfType(Class<T> 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.
Map<String,Object>	getBeansWithAnnotation(Class<? extends Annotation> annotationType) Find all beans whose Class has the supplied Annotation type, returning a Map of bean names with corresponding bean instances.
String	getDisplayName() Return a friendly name for this context.
ConfigurableEnvironment	getEnvironment() Return the Environment for this application context in configurable form.
String	getId() Return the unique id of this application context.
protected BeanFactory	getInternalParentBeanFactory() Return the internal bean factory of the parent context if it implements ConfigurableApplicationContext; else, return the parent context itself.
protected MessageSource	getInternalParentMessageSource() Return the internal message source of the parent context if it is an AbstractApplicationContext too; else, return the parent context itself.
String	getMessage(MessageSourceResolvable resolvable, Locale locale) Try to resolve the message using all the attributes contained within the MessageSourceResolvable argument that was passed in.
String	getMessage(String code, Object[] args, Locale locale) Try to resolve the message.
String	getMessage(String code, Object[] args, String defaultMessage, Locale locale) Try to resolve the message.
ApplicationContext	getParent() Return the parent context, or null if there is no parent (that is, this context is the root of the context hierarchy).
BeanFactory	getParentBeanFactory() Return the parent bean factory, or null if there is none.
protected ResourcePatternResolver	getResourcePatternResolver() Return the ResourcePatternResolver to use for resolving location patterns into Resource instances.
Resource[]	getResources(String locationPattern) Resolve the given location pattern into Resource objects.
long	getStartupDate() Return the timestamp (ms) when this context was first loaded.
Class<?>	getType(String name) Determine the type of the bean with the given name.
protected void	initApplicationEventMulticaster() Initialize the ApplicationEventMulticaster.
protected void	initLifecycleProcessor() Initialize the LifecycleProcessor.
protected void	initMessageSource() Initialize the MessageSource.
protected void	initPropertySources() Replace any stub property sources with actual instances.
protected void	invokeBeanFactoryPostProcessors(ConfigurableListableBeanFactory beanFactory) Instantiate and invoke all registered BeanFactoryPostProcessor beans, respecting explicit order if given.
boolean	isActive() Determine whether this application context is active, that is, whether it has been refreshed at least once and has not been closed yet.
boolean	isPrototype(String name) Is this bean a prototype? That is, will BeanFactory.getBean(java.lang.String) always return independent instances?
boolean	isRunning() Check whether this component is currently running.
boolean	isSingleton(String name) Is this bean a shared singleton? That is, will BeanFactory.getBean(java.lang.String) always return the same instance?
boolean	isTypeMatch(String name, Class<?> targetType) Check whether the bean with the given name matches the specified type.
protected ConfigurableListableBeanFactory	obtainFreshBeanFactory() Tell the subclass to refresh the internal bean factory.
protected void	onClose() Template method which can be overridden to add context-specific shutdown work.
protected void	onRefresh() Template method which can be overridden to add context-specific refresh work.
protected void	postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) Modify the application context's internal bean factory after its standard initialization.
protected void	prepareBeanFactory(ConfigurableListableBeanFactory beanFactory) Configure the factory's standard context characteristics, such as the context's ClassLoader and post-processors.
protected void	prepareRefresh() Prepare this context for refreshing, setting its startup date and active flag as well as performing any initialization of property sources.
void	publishEvent(ApplicationEvent event) Publish the given event to all listeners.
void	refresh() Load or refresh the persistent representation of the configuration, which might an XML file, properties file, or relational database schema.
protected abstract void	refreshBeanFactory() Subclasses must implement this method to perform the actual configuration load.
protected void	registerBeanPostProcessors(ConfigurableListableBeanFactory beanFactory) Instantiate and invoke all registered BeanPostProcessor beans, respecting explicit order if given.
protected void	registerListeners() Add beans that implement ApplicationListener as listeners.
void	registerShutdownHook() Register a shutdown hook with the JVM runtime, closing this context on JVM shutdown unless it has already been closed at that time.
void	setDisplayName(String displayName) Set a friendly name for this context.
void	setEnvironment(ConfigurableEnvironment environment) Set the Environment for this application context.
void	setId(String id) Set the unique id of this application context.
void	setParent(ApplicationContext parent) Set the parent of this application context.
void	start() Start this component.
void	stop() Stop this component, typically in a synchronous fashion, such that the component is fully stopped upon return of this method.
String	toString() Return information about this context.

Methods inherited from class org.springframework.core.io.DefaultResourceLoader

getClassLoader, getResource, getResourceByPath, setClassLoader

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.springframework.core.io.ResourceLoader

getClassLoader, getResource

Field Detail

MESSAGE_SOURCE_BEAN_NAME

public static final String MESSAGE_SOURCE_BEAN_NAME

Name of the MessageSource bean in the factory. If none is supplied, message resolution is delegated to the parent.

See Also:

MessageSource, Constant Field Values

LIFECYCLE_PROCESSOR_BEAN_NAME

public static final String LIFECYCLE_PROCESSOR_BEAN_NAME

Name of the LifecycleProcessor bean in the factory. If none is supplied, a DefaultLifecycleProcessor is used.

See Also:

LifecycleProcessor, DefaultLifecycleProcessor, Constant Field Values

APPLICATION_EVENT_MULTICASTER_BEAN_NAME

public static final String APPLICATION_EVENT_MULTICASTER_BEAN_NAME

Name of the ApplicationEventMulticaster bean in the factory. If none is supplied, a default SimpleApplicationEventMulticaster is used.

See Also:

ApplicationEventMulticaster, SimpleApplicationEventMulticaster, Constant Field Values

logger

protected final Log logger

Logger used by this class. Available to subclasses.

Constructor Detail

AbstractApplicationContext

public AbstractApplicationContext()

Create a new AbstractApplicationContext with no parent.

AbstractApplicationContext

public AbstractApplicationContext(ApplicationContext parent)

Create a new AbstractApplicationContext with the given parent context.

Parameters:

parent - the parent context

Method Detail

setId

public void setId(String id)

Set the unique id of this application context.

Default is the object id of the context instance, or the name of the context bean if the context is itself defined as a bean.

Specified by:

setId in interface ConfigurableApplicationContext

Parameters:

id - the unique id of the context

getId

public String getId()

Description copied from interface: ApplicationContext

Return the unique id of this application context.

Specified by:

getId in interface ApplicationContext

Returns:

the unique id of the context, or null if none

getApplicationName

public String getApplicationName()

Description copied from interface: ApplicationContext

Return a name for the deployed application that this context belongs to.

Specified by:

getApplicationName in interface ApplicationContext

Returns:

a name for the deployed application, or the empty String by default

setDisplayName

public void setDisplayName(String displayName)

Set a friendly name for this context. Typically done during initialization of concrete context implementations.

Default is the object id of the context instance.

getDisplayName

public String getDisplayName()

Return a friendly name for this context.

Specified by:

getDisplayName in interface ApplicationContext

Returns:

a display name for this context (never null)

getParent

public ApplicationContext getParent()

Return the parent context, or null if there is no parent (that is, this context is the root of the context hierarchy).

Specified by:

getParent in interface ApplicationContext

Returns:

the parent context, or null if there is no parent

getEnvironment

public ConfigurableEnvironment getEnvironment()

Return the Environment for this application context in configurable form.

If null, a new environment will be initialized via createEnvironment().

Specified by:

getEnvironment in interface ConfigurableApplicationContext

Specified by:

getEnvironment in interface EnvironmentCapable

setEnvironment

public void setEnvironment(ConfigurableEnvironment environment)

Set the Environment for this application context.

Default value is determined by createEnvironment(). Replacing the default with this method is one option but configuration through getEnvironment() should also be considered. In either case, such modifications should be performed before refresh().

Specified by:

setEnvironment in interface ConfigurableApplicationContext

Parameters:

environment - the new environment

See Also:

createEnvironment()

getAutowireCapableBeanFactory

public AutowireCapableBeanFactory getAutowireCapableBeanFactory()
                                                         throws IllegalStateException

Return this context's internal bean factory as AutowireCapableBeanFactory, if already available.

Specified by:

getAutowireCapableBeanFactory in interface ApplicationContext

Returns:

the AutowireCapableBeanFactory for this context

Throws:

IllegalStateException - if the context does not support the AutowireCapableBeanFactory interface or does not hold an autowire-capable bean factory yet (usually if refresh() has never been called)

See Also:

getBeanFactory()

getStartupDate

public long getStartupDate()

Return the timestamp (ms) when this context was first loaded.

Specified by:

getStartupDate in interface ApplicationContext

Returns:

the timestamp (ms) when this context was first loaded

publishEvent

public void publishEvent(ApplicationEvent event)

Publish the given event to all listeners.

Note: Listeners get initialized after the MessageSource, to be able to access it within listener implementations. Thus, MessageSource implementations cannot publish events.

Specified by:

publishEvent in interface ApplicationEventPublisher

Parameters:

event - the event to publish (may be application-specific or a standard framework event)

See Also:

RequestHandledEvent

getResourcePatternResolver

protected ResourcePatternResolver getResourcePatternResolver()

Return the ResourcePatternResolver to use for resolving location patterns into Resource instances. Default is a PathMatchingResourcePatternResolver, supporting Ant-style location patterns.

Can be overridden in subclasses, for extended resolution strategies, for example in a web environment.

Do not call this when needing to resolve a location pattern. Call the context's getResources method instead, which will delegate to the ResourcePatternResolver.

Returns:

the ResourcePatternResolver for this context

See Also:

getResources(java.lang.String), PathMatchingResourcePatternResolver

setParent

public void setParent(ApplicationContext parent)

Set the parent of this application context.

Note that the parent shouldn't be changed: It should only be set outside a constructor if it isn't available when an object of this class is created, for example in case of WebApplicationContext setup.

The parent environment is merged with this (child) application context environment if the parent is non-null and its environment is an instance of ConfigurableEnvironment.

Specified by:

setParent in interface ConfigurableApplicationContext

Parameters:

parent - the parent context

See Also:

ConfigurableEnvironment.merge(ConfigurableEnvironment)

addBeanFactoryPostProcessor

public void addBeanFactoryPostProcessor(BeanFactoryPostProcessor beanFactoryPostProcessor)

Description copied from interface: ConfigurableApplicationContext

Add a new BeanFactoryPostProcessor that will get applied to the internal bean factory of this application context on refresh, before any of the bean definitions get evaluated. To be invoked during context configuration.

Specified by:

addBeanFactoryPostProcessor in interface ConfigurableApplicationContext

Parameters:

beanFactoryPostProcessor - the factory processor to register

getBeanFactoryPostProcessors

public List<BeanFactoryPostProcessor> getBeanFactoryPostProcessors()

Return the list of BeanFactoryPostProcessors that will get applied to the internal BeanFactory.

addApplicationListener

public void addApplicationListener(ApplicationListener<?> listener)

Description copied from interface: ConfigurableApplicationContext

Add a new ApplicationListener that will be notified on context events such as context refresh and context shutdown.

Note that any ApplicationListener registered here will be applied on refresh if the context is not active yet, or on the fly with the current event multicaster in case of a context that is already active.

Specified by:

addApplicationListener in interface ConfigurableApplicationContext

Parameters:

listener - the ApplicationListener to register

See Also:

ContextRefreshedEvent, ContextClosedEvent

getApplicationListeners

public Collection<ApplicationListener<?>> getApplicationListeners()

Return the list of statically specified ApplicationListeners.

createEnvironment

protected ConfigurableEnvironment createEnvironment()

Create and return a new StandardEnvironment.

Subclasses may override this method in order to supply a custom ConfigurableEnvironment implementation.

refresh

public void refresh()
             throws BeansException,
                    IllegalStateException

Description copied from interface: ConfigurableApplicationContext

Load or refresh the persistent representation of the configuration, which might an XML file, properties file, or relational database schema.

As this is a startup method, it should destroy already created singletons if it fails, to avoid dangling resources. In other words, after invocation of that method, either all or no singletons at all should be instantiated.

Specified by:

refresh in interface ConfigurableApplicationContext

Throws:

BeansException - if the bean factory could not be initialized

IllegalStateException - if already initialized and multiple refresh attempts are not supported

prepareRefresh

protected void prepareRefresh()

Prepare this context for refreshing, setting its startup date and active flag as well as performing any initialization of property sources.

initPropertySources

protected void initPropertySources()

Replace any stub property sources with actual instances.

See Also:

PropertySource.StubPropertySource, WebApplicationContextUtils.initServletPropertySources(org.springframework.core.env.MutablePropertySources, javax.servlet.ServletContext)

obtainFreshBeanFactory

protected ConfigurableListableBeanFactory obtainFreshBeanFactory()

Tell the subclass to refresh the internal bean factory.

Returns:

the fresh BeanFactory instance

See Also:

refreshBeanFactory(), getBeanFactory()

prepareBeanFactory

protected void prepareBeanFactory(ConfigurableListableBeanFactory beanFactory)

Configure the factory's standard context characteristics, such as the context's ClassLoader and post-processors.

Parameters:

beanFactory - the BeanFactory to configure

postProcessBeanFactory

protected void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory)

Modify the application context's internal bean factory after its standard initialization. All bean definitions will have been loaded, but no beans will have been instantiated yet. This allows for registering special BeanPostProcessors etc in certain ApplicationContext implementations.

Parameters:

beanFactory - the bean factory used by the application context

invokeBeanFactoryPostProcessors

protected void invokeBeanFactoryPostProcessors(ConfigurableListableBeanFactory beanFactory)

Instantiate and invoke all registered BeanFactoryPostProcessor beans, respecting explicit order if given.

Must be called before singleton instantiation.

registerBeanPostProcessors

protected void registerBeanPostProcessors(ConfigurableListableBeanFactory beanFactory)

Instantiate and invoke all registered BeanPostProcessor beans, respecting explicit order if given.

Must be called before any instantiation of application beans.

initMessageSource

protected void initMessageSource()

Initialize the MessageSource. Use parent's if none defined in this context.

initApplicationEventMulticaster

protected void initApplicationEventMulticaster()

Initialize the ApplicationEventMulticaster. Uses SimpleApplicationEventMulticaster if none defined in the context.

See Also:

SimpleApplicationEventMulticaster

initLifecycleProcessor

protected void initLifecycleProcessor()

Initialize the LifecycleProcessor. Uses DefaultLifecycleProcessor if none defined in the context.

See Also:

DefaultLifecycleProcessor

onRefresh

protected void onRefresh()
                  throws BeansException

Template method which can be overridden to add context-specific refresh work. Called on initialization of special beans, before instantiation of singletons.

This implementation is empty.

Throws:

BeansException - in case of errors

See Also:

refresh()

registerListeners

protected void registerListeners()

Add beans that implement ApplicationListener as listeners. Doesn't affect other listeners, which can be added without being beans.

finishBeanFactoryInitialization

protected void finishBeanFactoryInitialization(ConfigurableListableBeanFactory beanFactory)

Finish the initialization of this context's bean factory, initializing all remaining singleton beans.

finishRefresh

protected void finishRefresh()

Finish the refresh of this context, invoking the LifecycleProcessor's onRefresh() method and publishing the ContextRefreshedEvent.

cancelRefresh

protected void cancelRefresh(BeansException ex)

Cancel this context's refresh attempt, resetting the active flag after an exception got thrown.

Parameters:

ex - the exception that led to the cancellation

registerShutdownHook

public void registerShutdownHook()

Register a shutdown hook with the JVM runtime, closing this context on JVM shutdown unless it has already been closed at that time.

Delegates to doClose() for the actual closing procedure.

Specified by:

registerShutdownHook in interface ConfigurableApplicationContext

See Also:

Runtime.addShutdownHook(java.lang.Thread), close(), doClose()

destroy

public void destroy()

DisposableBean callback for destruction of this instance. Only called when the ApplicationContext itself is running as a bean in another BeanFactory or ApplicationContext, which is rather unusual.

The close method is the native way to shut down an ApplicationContext.

Specified by:

destroy in interface DisposableBean

See Also:

close(), SingletonBeanFactoryLocator

close

public void close()

Close this application context, destroying all beans in its bean factory.

Delegates to doClose() for the actual closing procedure. Also removes a JVM shutdown hook, if registered, as it's not needed anymore.

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Specified by:

close in interface ConfigurableApplicationContext

See Also:

doClose(), registerShutdownHook()

doClose

protected void doClose()

Actually performs context closing: publishes a ContextClosedEvent and destroys the singletons in the bean factory of this application context.

Called by both close() and a JVM shutdown hook, if any.

See Also:

ContextClosedEvent, destroyBeans(), close(), registerShutdownHook()

destroyBeans

protected void destroyBeans()

Template method for destroying all beans that this context manages. The default implementation destroy all cached singletons in this context, invoking DisposableBean.destroy() and/or the specified "destroy-method".

Can be overridden to add context-specific bean destruction steps right before or right after standard singleton destruction, while the context's BeanFactory is still active.

See Also:

getBeanFactory(), ConfigurableBeanFactory.destroySingletons()

onClose

protected void onClose()

Template method which can be overridden to add context-specific shutdown work. The default implementation is empty.

Called at the end of doClose()'s shutdown procedure, after this context's BeanFactory has been closed. If custom shutdown logic needs to execute while the BeanFactory is still active, override the destroyBeans() method instead.

isActive

public boolean isActive()

Description copied from interface: ConfigurableApplicationContext

Determine whether this application context is active, that is, whether it has been refreshed at least once and has not been closed yet.

Specified by:

isActive in interface ConfigurableApplicationContext

Returns:

whether the context is still active

See Also:

ConfigurableApplicationContext.refresh(), ConfigurableApplicationContext.close(), ConfigurableApplicationContext.getBeanFactory()

assertBeanFactoryActive

protected void assertBeanFactoryActive()

Assert that this context's BeanFactory is currently active, throwing an IllegalStateException if it isn't.

Invoked by all BeanFactory delegation methods that depend on an active context, i.e. in particular all bean accessor methods.

The default implementation checks the 'active' status of this context overall. May be overridden for more specific checks, or for a no-op if getBeanFactory() itself throws an exception in such a case.

getBean

public Object getBean(String name)
               throws BeansException

Description copied from interface: BeanFactory

Return an instance, which may be shared or independent, of the specified bean.

This method allows a Spring BeanFactory to be used as a replacement for the Singleton or Prototype design pattern. Callers may retain references to returned objects in the case of Singleton beans.

Translates aliases back to the corresponding canonical bean name. Will ask the parent factory if the bean cannot be found in this factory instance.

Specified by:

getBean in interface BeanFactory

Parameters:

name - the name of the bean to retrieve

Returns:

an instance of the bean

Throws:

NoSuchBeanDefinitionException - if there is no bean definition with the specified name

BeansException - if the bean could not be obtained

getBean

public <T> T getBean(String name,
                     Class<T> requiredType)
              throws BeansException

Description copied from interface: BeanFactory

Return an instance, which may be shared or independent, of the specified bean.

Behaves the same as BeanFactory.getBean(String), but provides a measure of type safety by throwing a BeanNotOfRequiredTypeException if the bean is not of the required type. This means that ClassCastException can't be thrown on casting the result correctly, as can happen with BeanFactory.getBean(String).

Translates aliases back to the corresponding canonical bean name. Will ask the parent factory if the bean cannot be found in this factory instance.

Specified by:

getBean in interface BeanFactory

Parameters:

name - the name of the bean to retrieve

requiredType - type the bean must match. Can be an interface or superclass of the actual class, or null for any match. For example, if the value is Object.class, this method will succeed whatever the class of the returned instance.

Returns:

an instance of the bean

Throws:

NoSuchBeanDefinitionException - if there is no such bean definition

BeanNotOfRequiredTypeException - if the bean is not of the required type

BeansException - if the bean could not be created

getBean

public <T> T getBean(Class<T> requiredType)
              throws BeansException

Description copied from interface: BeanFactory

Return the bean instance that uniquely matches the given object type, if any.

Specified by:

getBean in interface BeanFactory

Parameters:

requiredType - type the bean must match; can be an interface or superclass. null is disallowed.

This method goes into ListableBeanFactory by-type lookup territory but may also be translated into a conventional by-name lookup based on the name of the given type. For more extensive retrieval operations across sets of beans, use ListableBeanFactory and/or BeanFactoryUtils.

Returns:

an instance of the single bean matching the required type

Throws:

NoSuchBeanDefinitionException - if no bean of the given type was found

NoUniqueBeanDefinitionException - if more than one bean of the given type was found

BeansException

See Also:

ListableBeanFactory

getBean

public Object getBean(String name,
                      Object... args)
               throws BeansException

Description copied from interface: BeanFactory

Return an instance, which may be shared or independent, of the specified bean.

Allows for specifying explicit constructor arguments / factory method arguments, overriding the specified default arguments (if any) in the bean definition.

Specified by:

getBean in interface BeanFactory

Parameters:

name - the name of the bean to retrieve

args - arguments to use if creating a prototype using explicit arguments

Returns:

an instance of the bean

Throws:

NoSuchBeanDefinitionException - if there is no such bean definition

BeanDefinitionStoreException - if arguments have been given but the affected bean isn't a prototype

BeansException - if the bean could not be created

containsBean

public boolean containsBean(String name)

Description copied from interface: BeanFactory

Does this bean factory contain a bean definition or externally registered singleton instance with the given name?

If the given name is an alias, it will be translated back to the corresponding canonical bean name.

If this factory is hierarchical, will ask any parent factory if the bean cannot be found in this factory instance.

If a bean definition or singleton instance matching the given name is found, this method will return true whether the named bean definition is concrete or abstract, lazy or eager, in scope or not. Therefore, note that a true return value from this method does not necessarily indicate that BeanFactory.getBean(java.lang.String) will be able to obtain an instance for the same name.

Specified by:

containsBean in interface BeanFactory

Parameters:

name - the name of the bean to query

Returns:

whether a bean with the given name is present

isSingleton

public boolean isSingleton(String name)
                    throws NoSuchBeanDefinitionException

Description copied from interface: BeanFactory

Is this bean a shared singleton? That is, will BeanFactory.getBean(java.lang.String) always return the same instance?

Note: This method returning false does not clearly indicate independent instances. It indicates non-singleton instances, which may correspond to a scoped bean as well. Use the BeanFactory.isPrototype(java.lang.String) operation to explicitly check for independent instances.

Translates aliases back to the corresponding canonical bean name. Will ask the parent factory if the bean cannot be found in this factory instance.

Specified by:

isSingleton in interface BeanFactory

Parameters:

name - the name of the bean to query

Returns:

whether this bean corresponds to a singleton instance

Throws:

NoSuchBeanDefinitionException - if there is no bean with the given name

See Also:

BeanFactory.getBean(java.lang.String), BeanFactory.isPrototype(java.lang.String)

isPrototype

public boolean isPrototype(String name)
                    throws NoSuchBeanDefinitionException

Description copied from interface: BeanFactory

Is this bean a prototype? That is, will BeanFactory.getBean(java.lang.String) always return independent instances?

Note: This method returning false does not clearly indicate a singleton object. It indicates non-independent instances, which may correspond to a scoped bean as well. Use the BeanFactory.isSingleton(java.lang.String) operation to explicitly check for a shared singleton instance.

Translates aliases back to the corresponding canonical bean name. Will ask the parent factory if the bean cannot be found in this factory instance.

Specified by:

isPrototype in interface BeanFactory

Parameters:

name - the name of the bean to query

Returns:

whether this bean will always deliver independent instances

Throws:

NoSuchBeanDefinitionException - if there is no bean with the given name

See Also:

BeanFactory.getBean(java.lang.String), BeanFactory.isSingleton(java.lang.String)

isTypeMatch

public boolean isTypeMatch(String name,
                           Class<?> targetType)
                    throws NoSuchBeanDefinitionException

Description copied from interface: BeanFactory

Check whether the bean with the given name matches the specified type. More specifically, check whether a BeanFactory.getBean(java.lang.String) call for the given name would return an object that is assignable to the specified target type.

Translates aliases back to the corresponding canonical bean name. Will ask the parent factory if the bean cannot be found in this factory instance.

Specified by:

isTypeMatch in interface BeanFactory

Parameters:

name - the name of the bean to query

targetType - the type to match against

Returns:

true if the bean type matches, false if it doesn't match or cannot be determined yet

Throws:

NoSuchBeanDefinitionException - if there is no bean with the given name

See Also:

BeanFactory.getBean(java.lang.String), BeanFactory.getType(java.lang.String)

getType

public Class<?> getType(String name)
                 throws NoSuchBeanDefinitionException

Description copied from interface: BeanFactory

Determine the type of the bean with the given name. More specifically, determine the type of object that BeanFactory.getBean(java.lang.String) would return for the given name.

For a FactoryBean, return the type of object that the FactoryBean creates, as exposed by FactoryBean.getObjectType().

Translates aliases back to the corresponding canonical bean name. Will ask the parent factory if the bean cannot be found in this factory instance.

Specified by:

getType in interface BeanFactory

Parameters:

name - the name of the bean to query

Returns:

the type of the bean, or null if not determinable

Throws:

NoSuchBeanDefinitionException - if there is no bean with the given name

See Also:

BeanFactory.getBean(java.lang.String), BeanFactory.isTypeMatch(java.lang.String, java.lang.Class<?>)

getAliases

public String[] getAliases(String name)

Description copied from interface: BeanFactory

Return the aliases for the given bean name, if any. All of those aliases point to the same bean when used in a BeanFactory.getBean(java.lang.String) call.

If the given name is an alias, the corresponding original bean name and other aliases (if any) will be returned, with the original bean name being the first element in the array.

Will ask the parent factory if the bean cannot be found in this factory instance.

Specified by:

getAliases in interface BeanFactory

Parameters:

name - the bean name to check for aliases

Returns:

the aliases, or an empty array if none

See Also:

BeanFactory.getBean(java.lang.String)

containsBeanDefinition

public boolean containsBeanDefinition(String beanName)

Description copied from interface: ListableBeanFactory

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.

Specified by:

containsBeanDefinition in interface ListableBeanFactory

Parameters:

beanName - the name of the bean to look for

Returns:

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

See Also:

BeanFactory.containsBean(java.lang.String)

getBeanDefinitionCount

public int getBeanDefinitionCount()

Description copied from interface: ListableBeanFactory

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.

Specified by:

getBeanDefinitionCount in interface ListableBeanFactory

Returns:

the number of beans defined in the factory

getBeanDefinitionNames

public String[] getBeanDefinitionNames()

Description copied from interface: ListableBeanFactory

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.

Specified by:

getBeanDefinitionNames in interface ListableBeanFactory

Returns:

the names of all beans defined in this factory, or an empty array if none defined

getBeanNamesForType

public String[] getBeanNamesForType(Class<?> type)

Description copied from interface: ListableBeanFactory

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 getBeanNamesOfType(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.

Specified by:

getBeanNamesForType in interface ListableBeanFactory

Parameters:

type - the class or interface to match, or null for all bean names

Returns:

the names of beans (or objects created by FactoryBeans) matching the given object type (including subclasses), or an empty array if none

See Also:

FactoryBean.getObjectType(), BeanFactoryUtils.beanNamesForTypeIncludingAncestors(ListableBeanFactory, Class)

getBeanNamesForType

public String[] getBeanNamesForType(Class<?> type,
                                    boolean includeNonSingletons,
                                    boolean allowEagerInit)

Description copied from interface: ListableBeanFactory

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.

Specified by:

getBeanNamesForType in interface ListableBeanFactory

Parameters:

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.

Returns:

the names of beans (or objects created by FactoryBeans) matching the given object type (including subclasses), or an empty array if none

See Also:

FactoryBean.getObjectType(), BeanFactoryUtils.beanNamesForTypeIncludingAncestors(ListableBeanFactory, Class, boolean, boolean)

getBeansOfType

public <T> Map<String,T> getBeansOfType(Class<T> type)
                                 throws BeansException

Description copied from interface: ListableBeanFactory

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.

Specified by:

getBeansOfType in interface ListableBeanFactory

Parameters:

type - the class or interface to match, or null for all concrete beans

Returns:

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 Also:

FactoryBean.getObjectType(), BeanFactoryUtils.beansOfTypeIncludingAncestors(ListableBeanFactory, Class)

getBeansOfType

public <T> Map<String,T> getBeansOfType(Class<T> type,
                                        boolean includeNonSingletons,
                                        boolean allowEagerInit)
                                 throws BeansException

Description copied from interface: ListableBeanFactory

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.

Specified by:

getBeansOfType in interface ListableBeanFactory

Parameters:

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.

Returns:

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 Also:

FactoryBean.getObjectType(), BeanFactoryUtils.beansOfTypeIncludingAncestors(ListableBeanFactory, Class, boolean, boolean)

getBeanNamesForAnnotation

public String[] getBeanNamesForAnnotation(Class<? extends Annotation> annotationType)

Description copied from interface: ListableBeanFactory

Find all names of beans whose Class has the supplied Annotation type, without creating any bean instances yet.

Specified by:

getBeanNamesForAnnotation in interface ListableBeanFactory

Parameters:

annotationType - the type of annotation to look for

Returns:

the names of all matching beans

getBeansWithAnnotation

public Map<String,Object> getBeansWithAnnotation(Class<? extends Annotation> annotationType)
                                          throws BeansException

Description copied from interface: ListableBeanFactory

Find all beans whose Class has the supplied Annotation type, returning a Map of bean names with corresponding bean instances.

Specified by:

getBeansWithAnnotation in interface ListableBeanFactory

Parameters:

annotationType - the type of annotation to look for

Returns:

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

findAnnotationOnBean

public <A extends Annotation> A findAnnotationOnBean(String beanName,
                                                     Class<A> annotationType)
                                              throws NoSuchBeanDefinitionException

Description copied from interface: ListableBeanFactory

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.

Specified by:

findAnnotationOnBean in interface ListableBeanFactory

Parameters:

beanName - the name of the bean to look for annotations on

annotationType - the annotation class to look for

Returns:

the annotation of the given type if found, or null

Throws:

NoSuchBeanDefinitionException - if there is no bean with the given name

getParentBeanFactory

public BeanFactory getParentBeanFactory()

Description copied from interface: HierarchicalBeanFactory

Return the parent bean factory, or null if there is none.

Specified by:

getParentBeanFactory in interface HierarchicalBeanFactory

containsLocalBean

public boolean containsLocalBean(String name)

Description copied from interface: HierarchicalBeanFactory

Return whether the local bean factory contains a bean of the given name, ignoring beans defined in ancestor contexts.

This is an alternative to containsBean, ignoring a bean of the given name from an ancestor bean factory.

Specified by:

containsLocalBean in interface HierarchicalBeanFactory

Parameters:

name - the name of the bean to query

Returns:

whether a bean with the given name is defined in the local factory

See Also:

BeanFactory.containsBean(java.lang.String)

getInternalParentBeanFactory

protected BeanFactory getInternalParentBeanFactory()

Return the internal bean factory of the parent context if it implements ConfigurableApplicationContext; else, return the parent context itself.

See Also:

ConfigurableApplicationContext.getBeanFactory()

getMessage

public String getMessage(String code,
                         Object[] args,
                         String defaultMessage,
                         Locale locale)

Description copied from interface: MessageSource

Try to resolve the message. Return default message if no message was found.

Specified by:

getMessage in interface MessageSource

Parameters:

code - the code to lookup up, such as 'calculator.noRateSet'. Users of this class are encouraged to base message names on the relevant fully qualified class name, thus avoiding conflict and ensuring maximum clarity.

args - array of arguments that will be filled in for params within the message (params look like "{0}", "{1,date}", "{2,time}" within a message), or null if none.

defaultMessage - String to return if the lookup fails

locale - the Locale in which to do the lookup

Returns:

the resolved message if the lookup was successful; otherwise the default message passed as a parameter

See Also:

MessageFormat

getMessage

public String getMessage(String code,
                         Object[] args,
                         Locale locale)
                  throws NoSuchMessageException

Description copied from interface: MessageSource

Try to resolve the message. Treat as an error if the message can't be found.

Specified by:

getMessage in interface MessageSource

Parameters:

code - the code to lookup up, such as 'calculator.noRateSet'

args - Array of arguments that will be filled in for params within the message (params look like "{0}", "{1,date}", "{2,time}" within a message), or null if none.

locale - the Locale in which to do the lookup

Returns:

the resolved message

Throws:

NoSuchMessageException - if the message wasn't found

See Also:

MessageFormat

getMessage

public String getMessage(MessageSourceResolvable resolvable,
                         Locale locale)
                  throws NoSuchMessageException

Description copied from interface: MessageSource

Try to resolve the message using all the attributes contained within the MessageSourceResolvable argument that was passed in.

NOTE: We must throw a NoSuchMessageException on this method since at the time of calling this method we aren't able to determine if the defaultMessage property of the resolvable is null or not.

Specified by:

getMessage in interface MessageSource

Parameters:

resolvable - value object storing attributes required to properly resolve a message

locale - the Locale in which to do the lookup

Returns:

the resolved message

Throws:

NoSuchMessageException - if the message wasn't found

See Also:

MessageFormat

getInternalParentMessageSource

protected MessageSource getInternalParentMessageSource()

Return the internal message source of the parent context if it is an AbstractApplicationContext too; else, return the parent context itself.

getResources

public Resource[] getResources(String locationPattern)
                        throws IOException

Description copied from interface: ResourcePatternResolver

Resolve the given location pattern into Resource objects.

Overlapping resource entries that point to the same physical resource should be avoided, as far as possible. The result should have set semantics.

Specified by:

getResources in interface ResourcePatternResolver

Parameters:

locationPattern - the location pattern to resolve

Returns:

the corresponding Resource objects

Throws:

IOException - in case of I/O errors

start

public void start()

Description copied from interface: Lifecycle

Start this component. Should not throw an exception if the component is already running.

In the case of a container, this will propagate the start signal to all components that apply.

Specified by:

start in interface Lifecycle

stop

public void stop()

Description copied from interface: Lifecycle

Stop this component, typically in a synchronous fashion, such that the component is fully stopped upon return of this method. Consider implementing SmartLifecycle and its stop(Runnable) variant in cases where asynchronous stop behavior is necessary.

Should not throw an exception if the component isn't started yet.

In the case of a container, this will propagate the stop signal to all components that apply.

Specified by:

stop in interface Lifecycle

See Also:

SmartLifecycle.stop(Runnable)

isRunning

public boolean isRunning()

Description copied from interface: Lifecycle

Check whether this component is currently running.

In the case of a container, this will return true only if all components that apply are currently running.

Specified by:

isRunning in interface Lifecycle

Returns:

whether the component is currently running

refreshBeanFactory

protected abstract void refreshBeanFactory()
                                    throws BeansException,
                                           IllegalStateException

Subclasses must implement this method to perform the actual configuration load. The method is invoked by refresh() before any other initialization work.

A subclass will either create a new bean factory and hold a reference to it, or return a single BeanFactory instance that it holds. In the latter case, it will usually throw an IllegalStateException if refreshing the context more than once.

Throws:

BeansException - if initialization of the bean factory failed

IllegalStateException - if already initialized and multiple refresh attempts are not supported

closeBeanFactory

protected abstract void closeBeanFactory()

Subclasses must implement this method to release their internal bean factory. This method gets invoked by close() after all other shutdown work.

Should never throw an exception but rather log shutdown failures.

getBeanFactory

public abstract ConfigurableListableBeanFactory getBeanFactory()
                                                        throws IllegalStateException

Subclasses must return their internal bean factory here. They should implement the lookup efficiently, so that it can be called repeatedly without a performance penalty.

Note: Subclasses should check whether the context is still active before returning the internal bean factory. The internal factory should generally be considered unavailable once the context has been closed.

Specified by:

getBeanFactory in interface ConfigurableApplicationContext

Returns:

this application context's internal bean factory (never null)

Throws:

IllegalStateException - if the context does not hold an internal bean factory yet (usually if refresh() has never been called) or if the context has been closed already

See Also:

refreshBeanFactory(), closeBeanFactory()

toString

public String toString()

Return information about this context.

Overrides:

toString in class Object