org.springframework.context.support

Class GenericApplicationContext

java.lang.Object

org.springframework.core.io.DefaultResourceLoader

org.springframework.context.support.AbstractApplicationContext

org.springframework.context.support.GenericApplicationContext

All Implemented Interfaces:

Closeable, AutoCloseable, org.springframework.beans.factory.BeanFactory, org.springframework.beans.factory.DisposableBean, org.springframework.beans.factory.HierarchicalBeanFactory, org.springframework.beans.factory.ListableBeanFactory, org.springframework.beans.factory.support.BeanDefinitionRegistry, ApplicationContext, ApplicationEventPublisher, ConfigurableApplicationContext, Lifecycle, MessageSource, org.springframework.core.AliasRegistry, org.springframework.core.env.EnvironmentCapable, org.springframework.core.io.ResourceLoader, org.springframework.core.io.support.ResourcePatternResolver

Direct Known Subclasses:

AnnotationConfigApplicationContext, GenericXmlApplicationContext, StaticApplicationContext

public class GenericApplicationContext
extends AbstractApplicationContext
implements org.springframework.beans.factory.support.BeanDefinitionRegistry

Generic ApplicationContext implementation that holds a single internal DefaultListableBeanFactory instance and does not assume a specific bean definition format. Implements the BeanDefinitionRegistry interface in order to allow for applying any bean definition readers to it.

Typical usage is to register a variety of bean definitions via the BeanDefinitionRegistry interface and then call AbstractApplicationContext.refresh() to initialize those beans with application context semantics (handling ApplicationContextAware, auto-detecting BeanFactoryPostProcessors, etc).

In contrast to other ApplicationContext implementations that create a new internal BeanFactory instance for each refresh, the internal BeanFactory of this context is available right from the start, to be able to register bean definitions on it. AbstractApplicationContext.refresh() may only be called once.

Usage example:

 GenericApplicationContext ctx = new GenericApplicationContext();
 XmlBeanDefinitionReader xmlReader = new XmlBeanDefinitionReader(ctx);
 xmlReader.loadBeanDefinitions(new ClassPathResource("applicationContext.xml"));
 PropertiesBeanDefinitionReader propReader = new PropertiesBeanDefinitionReader(ctx);
 propReader.loadBeanDefinitions(new ClassPathResource("otherBeans.properties"));
 ctx.refresh();

 MyBean myBean = (MyBean) ctx.getBean("myBean");
 ...

For the typical case of XML bean definitions, simply use ClassPathXmlApplicationContext or FileSystemXmlApplicationContext, which are easier to set up - but less flexible, since you can just use standard resource locations for XML bean definitions, rather than mixing arbitrary bean definition formats. The equivalent in a web environment is org.springframework.web.context.support.XmlWebApplicationContext.

For custom application context implementations that are supposed to read special bean definition formats in a refreshable manner, consider deriving from the AbstractRefreshableApplicationContext base class.

Since:

1.1.2

Author:

Juergen Hoeller, Chris Beams

See Also:

registerBeanDefinition(java.lang.String, org.springframework.beans.factory.config.BeanDefinition), AbstractApplicationContext.refresh(), XmlBeanDefinitionReader, PropertiesBeanDefinitionReader

Field Summary

Fields inherited from class org.springframework.context.support.AbstractApplicationContext

APPLICATION_EVENT_MULTICASTER_BEAN_NAME, LIFECYCLE_PROCESSOR_BEAN_NAME, logger, MESSAGE_SOURCE_BEAN_NAME

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
GenericApplicationContext() Create a new GenericApplicationContext.
GenericApplicationContext(ApplicationContext parent) Create a new GenericApplicationContext with the given parent.
GenericApplicationContext(org.springframework.beans.factory.support.DefaultListableBeanFactory beanFactory) Create a new GenericApplicationContext with the given DefaultListableBeanFactory.
GenericApplicationContext(org.springframework.beans.factory.support.DefaultListableBeanFactory beanFactory, ApplicationContext parent) Create a new GenericApplicationContext with the given DefaultListableBeanFactory.

Method Summary

Methods

Modifier and Type	Method and Description
protected void	cancelRefresh(org.springframework.beans.BeansException ex) Cancel this context's refresh attempt, resetting the active flag after an exception got thrown.
protected void	closeBeanFactory() Not much to do: We hold a single internal BeanFactory that will never get released.
org.springframework.beans.factory.config.BeanDefinition	getBeanDefinition(String beanName)
org.springframework.beans.factory.config.ConfigurableListableBeanFactory	getBeanFactory() Return the single internal BeanFactory held by this context (as ConfigurableListableBeanFactory).
org.springframework.beans.factory.support.DefaultListableBeanFactory	getDefaultListableBeanFactory() Return the underlying bean factory of this context, available for registering bean definitions.
org.springframework.core.io.Resource	getResource(String location) This implementation delegates to this context's ResourceLoader if set, falling back to the default superclass behavior else.
org.springframework.core.io.Resource[]	getResources(String locationPattern) This implementation delegates to this context's ResourceLoader if it implements the ResourcePatternResolver interface, falling back to the default superclass behavior else.
boolean	isAlias(String beanName)
boolean	isBeanNameInUse(String beanName)
protected void	refreshBeanFactory() Do nothing: We hold a single internal BeanFactory and rely on callers to register beans through our public methods (or the BeanFactory's).
void	registerAlias(String beanName, String alias)
void	registerBeanDefinition(String beanName, org.springframework.beans.factory.config.BeanDefinition beanDefinition)
void	removeAlias(String alias)
void	removeBeanDefinition(String beanName)
void	setAllowBeanDefinitionOverriding(boolean allowBeanDefinitionOverriding) Set whether it should be allowed to override bean definitions by registering a different definition with the same name, automatically replacing the former.
void	setAllowCircularReferences(boolean allowCircularReferences) Set whether to allow circular references between beans - and automatically try to resolve them.
void	setId(String id) Set the unique id of this application context.
void	setParent(ApplicationContext parent) Set the parent of this application context, also setting the parent of the internal BeanFactory accordingly.
void	setResourceLoader(org.springframework.core.io.ResourceLoader resourceLoader) Set a ResourceLoader to use for this context.

Methods inherited from class org.springframework.context.support.AbstractApplicationContext

addApplicationListener, addBeanFactoryPostProcessor, addListener, close, containsBean, containsBeanDefinition, containsLocalBean, createEnvironment, destroy, destroyBeans, doClose, findAnnotationOnBean, finishBeanFactoryInitialization, finishRefresh, getAliases, getApplicationListeners, getApplicationName, getAutowireCapableBeanFactory, getBean, getBean, getBean, getBean, getBeanDefinitionCount, getBeanDefinitionNames, getBeanFactoryPostProcessors, getBeanNamesForType, getBeanNamesForType, getBeansOfType, getBeansOfType, getBeansWithAnnotation, getDisplayName, getEnvironment, getId, getInternalParentBeanFactory, getInternalParentMessageSource, getMessage, getMessage, getMessage, getParent, getParentBeanFactory, getResourcePatternResolver, getStartupDate, getType, initApplicationEventMulticaster, initLifecycleProcessor, initMessageSource, initPropertySources, invokeBeanFactoryPostProcessors, isActive, isPrototype, isRunning, isSingleton, isTypeMatch, obtainFreshBeanFactory, onClose, onRefresh, postProcessBeanFactory, prepareBeanFactory, prepareRefresh, publishEvent, refresh, registerBeanPostProcessors, registerListeners, registerShutdownHook, setDisplayName, setEnvironment, start, stop, toString

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

getClassLoader, 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.beans.factory.support.BeanDefinitionRegistry

containsBeanDefinition, getBeanDefinitionCount, getBeanDefinitionNames

Methods inherited from interface org.springframework.core.AliasRegistry

getAliases

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

getClassLoader

Constructor Detail

GenericApplicationContext

public GenericApplicationContext()

Create a new GenericApplicationContext.

See Also:

registerBeanDefinition(java.lang.String, org.springframework.beans.factory.config.BeanDefinition), AbstractApplicationContext.refresh()

GenericApplicationContext

public GenericApplicationContext(org.springframework.beans.factory.support.DefaultListableBeanFactory beanFactory)

Create a new GenericApplicationContext with the given DefaultListableBeanFactory.

Parameters:

beanFactory - the DefaultListableBeanFactory instance to use for this context

See Also:

registerBeanDefinition(java.lang.String, org.springframework.beans.factory.config.BeanDefinition), AbstractApplicationContext.refresh()

GenericApplicationContext

public GenericApplicationContext(ApplicationContext parent)

Create a new GenericApplicationContext with the given parent.

Parameters:

parent - the parent application context

See Also:

registerBeanDefinition(java.lang.String, org.springframework.beans.factory.config.BeanDefinition), AbstractApplicationContext.refresh()

GenericApplicationContext

public GenericApplicationContext(org.springframework.beans.factory.support.DefaultListableBeanFactory beanFactory,
                         ApplicationContext parent)

Create a new GenericApplicationContext with the given DefaultListableBeanFactory.

Parameters:

beanFactory - the DefaultListableBeanFactory instance to use for this context

parent - the parent application context

See Also:

registerBeanDefinition(java.lang.String, org.springframework.beans.factory.config.BeanDefinition), AbstractApplicationContext.refresh()

Method Detail

setParent

public void setParent(ApplicationContext parent)

Set the parent of this application context, also setting the parent of the internal BeanFactory accordingly.

Specified by:

setParent in interface ConfigurableApplicationContext

Overrides:

setParent in class AbstractApplicationContext

Parameters:

parent - the parent context

See Also:

ConfigurableBeanFactory.setParentBeanFactory(org.springframework.beans.factory.BeanFactory)

setId

public void setId(String id)

Description copied from class: AbstractApplicationContext

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

Overrides:

setId in class AbstractApplicationContext

Parameters:

id - the unique id of the context

setAllowBeanDefinitionOverriding

public void setAllowBeanDefinitionOverriding(boolean allowBeanDefinitionOverriding)

Set whether it should be allowed to override bean definitions by registering a different definition with the same name, automatically replacing the former. If not, an exception will be thrown. Default is "true".

See Also:

DefaultListableBeanFactory.setAllowBeanDefinitionOverriding(boolean)

setAllowCircularReferences

public void setAllowCircularReferences(boolean allowCircularReferences)

Set whether to allow circular references between beans - and automatically try to resolve them.

Default is "true". Turn this off to throw an exception when encountering a circular reference, disallowing them completely.

See Also:

AbstractAutowireCapableBeanFactory.setAllowCircularReferences(boolean)

setResourceLoader

public void setResourceLoader(org.springframework.core.io.ResourceLoader resourceLoader)

Set a ResourceLoader to use for this context. If set, the context will delegate all getResource calls to the given ResourceLoader. If not set, default resource loading will apply.

The main reason to specify a custom ResourceLoader is to resolve resource paths (without URL prefix) in a specific fashion. The default behavior is to resolve such paths as class path locations. To resolve resource paths as file system locations, specify a FileSystemResourceLoader here.

You can also pass in a full ResourcePatternResolver, which will be autodetected by the context and used for getResources calls as well. Else, default resource pattern matching will apply.

See Also:

getResource(java.lang.String), DefaultResourceLoader, FileSystemResourceLoader, ResourcePatternResolver, getResources(java.lang.String)

getResource

public org.springframework.core.io.Resource getResource(String location)

This implementation delegates to this context's ResourceLoader if set, falling back to the default superclass behavior else.

Specified by:

getResource in interface org.springframework.core.io.ResourceLoader

Overrides:

getResource in class org.springframework.core.io.DefaultResourceLoader

See Also:

setResourceLoader(org.springframework.core.io.ResourceLoader)

getResources

public org.springframework.core.io.Resource[] getResources(String locationPattern)
                                                    throws IOException

This implementation delegates to this context's ResourceLoader if it implements the ResourcePatternResolver interface, falling back to the default superclass behavior else.

Specified by:

getResources in interface org.springframework.core.io.support.ResourcePatternResolver

Overrides:

getResources in class AbstractApplicationContext

Throws:

IOException

See Also:

setResourceLoader(org.springframework.core.io.ResourceLoader)

refreshBeanFactory

protected final void refreshBeanFactory()
                                 throws IllegalStateException

Do nothing: We hold a single internal BeanFactory and rely on callers to register beans through our public methods (or the BeanFactory's).

Specified by:

refreshBeanFactory in class AbstractApplicationContext

Throws:

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

See Also:

registerBeanDefinition(java.lang.String, org.springframework.beans.factory.config.BeanDefinition)

cancelRefresh

protected void cancelRefresh(org.springframework.beans.BeansException ex)

Description copied from class: AbstractApplicationContext

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

Overrides:

cancelRefresh in class AbstractApplicationContext

Parameters:

ex - the exception that led to the cancellation

closeBeanFactory

protected final void closeBeanFactory()

Not much to do: We hold a single internal BeanFactory that will never get released.

Specified by:

closeBeanFactory in class AbstractApplicationContext

getBeanFactory

public final org.springframework.beans.factory.config.ConfigurableListableBeanFactory getBeanFactory()

Return the single internal BeanFactory held by this context (as ConfigurableListableBeanFactory).

Specified by:

getBeanFactory in interface ConfigurableApplicationContext

Specified by:

getBeanFactory in class AbstractApplicationContext

Returns:

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

See Also:

AbstractApplicationContext.refreshBeanFactory(), AbstractApplicationContext.closeBeanFactory()

getDefaultListableBeanFactory

public final org.springframework.beans.factory.support.DefaultListableBeanFactory getDefaultListableBeanFactory()

Return the underlying bean factory of this context, available for registering bean definitions.

NOTE: You need to call AbstractApplicationContext.refresh() to initialize the bean factory and its contained beans with application context semantics (autodetecting BeanFactoryPostProcessors, etc).

Returns:

the internal bean factory (as DefaultListableBeanFactory)

registerBeanDefinition

public void registerBeanDefinition(String beanName,
                          org.springframework.beans.factory.config.BeanDefinition beanDefinition)
                            throws org.springframework.beans.factory.BeanDefinitionStoreException

Specified by:

registerBeanDefinition in interface org.springframework.beans.factory.support.BeanDefinitionRegistry

Throws:

org.springframework.beans.factory.BeanDefinitionStoreException

removeBeanDefinition

public void removeBeanDefinition(String beanName)
                          throws org.springframework.beans.factory.NoSuchBeanDefinitionException

Specified by:

removeBeanDefinition in interface org.springframework.beans.factory.support.BeanDefinitionRegistry

Throws:

org.springframework.beans.factory.NoSuchBeanDefinitionException

getBeanDefinition

public org.springframework.beans.factory.config.BeanDefinition getBeanDefinition(String beanName)
                                                                          throws org.springframework.beans.factory.NoSuchBeanDefinitionException

Specified by:

getBeanDefinition in interface org.springframework.beans.factory.support.BeanDefinitionRegistry

Throws:

org.springframework.beans.factory.NoSuchBeanDefinitionException

isBeanNameInUse

public boolean isBeanNameInUse(String beanName)

Specified by:

isBeanNameInUse in interface org.springframework.beans.factory.support.BeanDefinitionRegistry

registerAlias

public void registerAlias(String beanName,
                 String alias)

Specified by:

registerAlias in interface org.springframework.core.AliasRegistry

removeAlias

public void removeAlias(String alias)

Specified by:

removeAlias in interface org.springframework.core.AliasRegistry

isAlias

public boolean isAlias(String beanName)

Specified by:

isAlias in interface org.springframework.core.AliasRegistry