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EhCacheManagerFactoryBean (Spring Framework API 2.0) - Spring Framework 2.0.5 API 文档英文版

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org.springframework.cache.ehcache
Class EhCacheManagerFactoryBean

java.lang.Object
  org.springframework.cache.ehcache.EhCacheManagerFactoryBean

All Implemented Interfaces:

DisposableBean, FactoryBean, InitializingBean

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public class EhCacheManagerFactoryBean
extends Object
implements FactoryBean, InitializingBean, DisposableBean

FactoryBean that exposes an EHCache CacheManager instance (independent or shared), configured from a specified config location.

If no config location is specified, a CacheManager will be configured from "ehcache.xml" in the root of the class path (that is, default EHCache initialization - as defined in the EHCache docs - will apply).

Setting up a separate EhCacheManagerFactoryBean is also advisable when using EhCacheFactoryBean, as it provides a (by default) independent CacheManager instance and cares for proper shutdown of the CacheManager. EhCacheManagerFactoryBean is also necessary for loading EHCache configuration from a non-default config location.

Note: As of Spring 2.0, this FactoryBean will by default create an independent CacheManager instance, which requires EHCache 1.2 or higher. Set the "shared" flag to "true" to create a CacheManager instance that is shared at the VM level (which is also compatible with EHCache 1.1).

Since:

1.1.1

Author:

Dmitriy Kopylenko, Juergen Hoeller

See Also:

setConfigLocation(org.springframework.core.io.Resource), setShared(boolean), EhCacheFactoryBean, CacheManager

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Field Summary
protected  Log	logger

 

Constructor Summary
EhCacheManagerFactoryBean()

 

Method Summary
void	afterPropertiesSet()           Invoked by a BeanFactory after it has set all bean properties supplied (and satisfied BeanFactoryAware and ApplicationContextAware).
void	destroy()           Invoked by a BeanFactory on destruction of a singleton.
Object	getObject()           Return an instance (possibly shared or independent) of the object managed by this factory.
Class	getObjectType()           Return the type of object that this FactoryBean creates, or null if not known in advance.
boolean	isSingleton()           Is the object managed by this factory a singleton?
void	setConfigLocation(Resource configLocation)           Set the location of the EHCache config file.
void	setShared(boolean shared)           Set whether the EHCache CacheManager should be shared (as a singleton at the VM level) or independent (typically local within the application).

 

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Field Detail

logger

protected final Log logger

Constructor Detail

EhCacheManagerFactoryBean

public EhCacheManagerFactoryBean()

Method Detail

setConfigLocation

public void setConfigLocation(Resource configLocation)

Set the location of the EHCache config file. A typical value is "/WEB-INF/ehcache.xml".

Default is "ehcache.xml" in the root of the class path, or if not found, "ehcache-failsafe.xml" in the EHCache jar (default EHCache initialization).

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setShared

public void setShared(boolean shared)

Set whether the EHCache CacheManager should be shared (as a singleton at the VM level) or independent (typically local within the application). Default is "false", creating an independent instance.

Note that independent CacheManager instances are only available on EHCache 1.2 and higher. Switch this flag to "true" if you intend to run against an EHCache 1.1 jar.

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afterPropertiesSet

public void afterPropertiesSet()
                        throws IOException,
                               CacheException

Description copied from interface: InitializingBean

Invoked by a BeanFactory after it has set all bean properties supplied (and satisfied BeanFactoryAware and ApplicationContextAware).

This method allows the bean instance to perform initialization only possible when all bean properties have been set and to throw an exception in the event of misconfiguration.

Specified by:

afterPropertiesSet in interface InitializingBean

Throws:

IOException

CacheException

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getObject

public Object getObject()

Description copied from interface: FactoryBean

Return an instance (possibly shared or independent) of the object managed by this factory.

As with a BeanFactory, this allows support for both the Singleton and Prototype design pattern.

If this FactoryBean is not fully initialized yet at the time of the call (for example because it is involved in a circular reference), throw a corresponding FactoryBeanNotInitializedException.

As of Spring 2.0, FactoryBeans are allowed to return null objects. The factory will consider this as normal value to be used; it will not throw a FactoryBeanNotInitializedException in this case anymore. FactoryBean implementations are encouraged to throw FactoryBeanNotInitializedException themselves now, as appropriate.

Specified by:

getObject in interface FactoryBean

Returns:

an instance of the bean (can be null)

See Also:

FactoryBeanNotInitializedException

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getObjectType

public Class getObjectType()

Description copied from interface: FactoryBean

Return the type of object that this FactoryBean creates, or null if not known in advance.

This allows one to check for specific types of beans without instantiating objects, for example on autowiring.

In the case of implementations that are creating a singleton object, this method should try to avoid singleton creation as far as possible; it should rather estimate the type in advance. For prototypes, returning a meaningful type here is advisable too.

This method can be called before this FactoryBean has been fully initialized. It must not rely on state created during initialization; of course, it can still use such state if available.

NOTE: Autowiring will simply ignore FactoryBeans that return null here. Therefore it is highly recommended to implement this method properly, using the current state of the FactoryBean.

Specified by:

getObjectType in interface FactoryBean

Returns:

the type of object that this FactoryBean creates, or null if not known at the time of the call

See Also:

ListableBeanFactory.getBeansOfType(java.lang.Class)

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isSingleton

public boolean isSingleton()

Description copied from interface: FactoryBean

Is the object managed by this factory a singleton? That is, will FactoryBean.getObject() always return the same object (a reference that can be cached)?

NOTE: If a FactoryBean indicates to hold a singleton object, the object returned from getObject() might get cached by the owning BeanFactory. Hence, do not return true unless the FactoryBean always exposes the same reference.

The singleton status of the FactoryBean itself will generally be provided by the owning BeanFactory; usually, it has to be defined as singleton there.

NOTE: This method returning false does not necessarily indicate that returned objects are independent instances. An implementation of the extended SmartFactoryBean interface may explicitly indicate independent instances through its SmartFactoryBean.isPrototype() method. Plain FactoryBean implementations which do not implement this extended interface are simply assumed to always return independent instances if the isSingleton() implementation returns false.

Specified by:

isSingleton in interface FactoryBean

Returns:

if the exposed object is a singleton

See Also:

FactoryBean.getObject(), SmartFactoryBean.isPrototype()

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destroy

public void destroy()

Description copied from interface: DisposableBean

Invoked by a BeanFactory on destruction of a singleton.

Specified by:

destroy in interface DisposableBean

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