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GenericApplicationContext (Spring Framework API 2.1) - Spring Framework 2.1.0 API 文档英文版

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org.springframework.context.support
Class GenericApplicationContext

java.lang.Object
  extended by org.springframework.core.io.DefaultResourceLoader
      extended by org.springframework.context.support.AbstractApplicationContext
          extended by org.springframework.context.support.GenericApplicationContext
All Implemented Interfaces:
BeanFactory, DisposableBean, HierarchicalBeanFactory, ListableBeanFactory, BeanDefinitionRegistry, ApplicationContext, ApplicationEventPublisher, ConfigurableApplicationContext, Lifecycle, MessageSource, ResourceLoader, ResourcePatternResolver
Direct Known Subclasses:
GenericWebApplicationContext, ResourceAdapterApplicationContext, StaticApplicationContext
public class GenericApplicationContext
extends AbstractApplicationContext
implements 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 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
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, logger, MESSAGE_SOURCE_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
GenericApplicationContext()
          Create a new GenericApplicationContext.
GenericApplicationContext(ApplicationContext parent)
          Create a new GenericApplicationContext with the given parent.
GenericApplicationContext(DefaultListableBeanFactory beanFactory)
          Create a new GenericApplicationContext with the given DefaultListableBeanFactory.
GenericApplicationContext(DefaultListableBeanFactory beanFactory, ApplicationContext parent)
          Create a new GenericApplicationContext with the given DefaultListableBeanFactory.
 
Method Summary
protected  void closeBeanFactory()
          Do nothing: We hold a single internal BeanFactory that will never get released.
 BeanDefinition getBeanDefinition(String beanName)
          Return the BeanDefinition for the given bean name.
 ConfigurableListableBeanFactory getBeanFactory()
          Return the single internal BeanFactory held by this context (as ConfigurableListableBeanFactory).
 DefaultListableBeanFactory getDefaultListableBeanFactory()
          Return the underlying bean factory of this context, available for registering bean definitions.
 Resource getResource(String location)
          This implementation delegates to this context's ResourceLoader if set, falling back to the default superclass behavior else.
 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.
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)
          Given a bean name, create an alias.
 void registerBeanDefinition(String beanName, BeanDefinition beanDefinition)
          Register a new bean definition with this registry.
 void setParent(ApplicationContext parent)
          Set the parent of this application context, also setting the parent of the internal BeanFactory accordingly.
 void setResourceLoader(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, destroy, destroyBeans, doClose, getAliases, getApplicationListeners, getAutowireCapableBeanFactory, getBean, getBean, getBeanDefinitionCount, getBeanDefinitionNames, getBeanFactoryPostProcessors, getBeanNamesForType, getBeanNamesForType, getBeansOfType, getBeansOfType, getDisplayName, getInternalParentBeanFactory, getInternalParentMessageSource, getLifecycleBeans, getMessage, getMessage, getMessage, getParent, getParentBeanFactory, getResourcePatternResolver, getStartupDate, getType, initApplicationEventMulticaster, initMessageSource, invokeBeanFactoryPostProcessors, isActive, isPrototype, isRunning, isSingleton, isTypeMatch, obtainFreshBeanFactory, onClose, onRefresh, postProcessBeanFactory, prepareBeanFactory, prepareRefresh, publishEvent, refresh, registerBeanPostProcessors, registerListeners, registerShutdownHook, setDisplayName, 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, getAliases, getBeanDefinitionCount, getBeanDefinitionNames
 
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(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(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)

setResourceLoader

public void setResourceLoader(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 (withour 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 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 ResourceLoader
Overrides:
getResource in class DefaultResourceLoader
Parameters:
location - the resource location
Returns:
a corresponding Resource handle
See Also:
setResourceLoader(org.springframework.core.io.ResourceLoader)

getResources

public 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 ResourcePatternResolver
Overrides:
getResources in class AbstractApplicationContext
Parameters:
locationPattern - the location pattern to resolve
Returns:
the corresponding Resource objects
Throws:
IOException - in case of I/O errors
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)

closeBeanFactory

protected final void closeBeanFactory()
Do nothing: We hold a single internal BeanFactory that will never get released.

Specified by:
closeBeanFactory in class AbstractApplicationContext

getBeanFactory

public final 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 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)

getBeanDefinition

public BeanDefinition getBeanDefinition(String beanName)
                                 throws BeansException
Description copied from interface: BeanDefinitionRegistry
Return the BeanDefinition for the given bean name.

Specified by:
getBeanDefinition in interface BeanDefinitionRegistry
Parameters:
beanName - name of the bean to find a definition for
Returns:
the BeanDefinition for the given name (never null)
Throws:
NoSuchBeanDefinitionException - if there is no such bean definition
BeansException

registerBeanDefinition

public void registerBeanDefinition(String beanName,
                                   BeanDefinition beanDefinition)
                            throws BeansException
Description copied from interface: BeanDefinitionRegistry
Register a new bean definition with this registry. Must support RootBeanDefinition and ChildBeanDefinition.

Specified by:
registerBeanDefinition in interface BeanDefinitionRegistry
Parameters:
beanName - the name of the bean instance to register
beanDefinition - definition of the bean instance to register
Throws:
BeanDefinitionStoreException - if the BeanDefinition is invalid or if there is already a BeanDefinition for the specified bean name (and we are not allowed to override it)
BeansException
See Also:
RootBeanDefinition, ChildBeanDefinition

registerAlias

public void registerAlias(String beanName,
                          String alias)
                   throws BeansException
Description copied from interface: BeanDefinitionRegistry
Given a bean name, create an alias. We typically use this method to support names that are illegal within XML ids (used for bean names).

Specified by:
registerAlias in interface BeanDefinitionRegistry
Parameters:
beanName - the canonical name of the bean
alias - the alias to be registered for the bean
Throws:
BeanDefinitionStoreException - if the alias is already in use
BeansException
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