org.springframework.cache.ehcache

Class EhCacheFactoryBean

java.lang.Object

CacheConfiguration

org.springframework.cache.ehcache.EhCacheFactoryBean

All Implemented Interfaces:

Aware, BeanNameAware, FactoryBean<Ehcache>, InitializingBean

public class EhCacheFactoryBean
extends CacheConfiguration
implements FactoryBean<Ehcache>, BeanNameAware, InitializingBean

FactoryBean that creates a named EhCache net.sf.ehcache.Cache instance (or a decorator that implements the net.sf.ehcache.Ehcache interface), representing a cache region within an EhCache net.sf.ehcache.CacheManager.

If the specified named cache is not configured in the cache configuration descriptor, this FactoryBean will construct an instance of a Cache with the provided name and the specified cache properties and add it to the CacheManager for later retrieval. If some or all properties are not set at configuration time, this FactoryBean will use defaults.

Note: If the named Cache instance is found, the properties will be ignored and the Cache instance will be retrieved from the CacheManager.

Note: As of Spring 4.0, Spring's EhCache support requires EhCache 2.1 or higher. We recommend the use of EhCache 2.5 or higher.

Since:

1.1.1

Author:

Juergen Hoeller, Dmitriy Kopylenko

See Also:

setCacheManager(CacheManager), EhCacheManagerFactoryBean, net.sf.ehcache.Cache

Field Summary

Fields

Modifier and Type	Field and Description
private java.lang.String	beanName
private boolean	blocking
private BootstrapCacheLoader	bootstrapCacheLoader
private Ehcache	cache
private CacheEntryFactory	cacheEntryFactory
private java.util.Set<CacheEventListener>	cacheEventListeners
private CacheManager	cacheManager
private boolean	disabled
protected Log	logger
private boolean	sampledStatisticsEnabled
private static boolean	setStatisticsAvailable
private boolean	statisticsEnabled

Constructor Summary

Constructors

Constructor and Description
EhCacheFactoryBean()

Method Summary

Modifier and Type	Method and Description
void	afterPropertiesSet() Invoked by a BeanFactory after it has set all bean properties supplied (and satisfied BeanFactoryAware and ApplicationContextAware).
protected Cache	createCache() Create a raw Cache object based on the configuration of this FactoryBean.
protected Ehcache	decorateCache(Ehcache cache) Decorate the given Cache, if necessary.
Ehcache	getObject() Return an instance (possibly shared or independent) of the object managed by this factory.
java.lang.Class<? extends Ehcache>	getObjectType() Predict the particular Ehcache implementation that will be returned from getObject() based on logic in createCache() and decorateCache(Ehcache) as orchestrated by afterPropertiesSet().
boolean	isSingleton() 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)?
void	setBeanName(java.lang.String name) Set the name of the bean in the bean factory that created this bean.
void	setBlocking(boolean blocking) Set whether to use a blocking cache that lets read attempts block until the requested element is created.
void	setBootstrapCacheLoader(BootstrapCacheLoader bootstrapCacheLoader) Set an EhCache net.sf.ehcache.bootstrap.BootstrapCacheLoader for this cache, if any.
void	setCacheEntryFactory(CacheEntryFactory cacheEntryFactory) Set an EhCache net.sf.ehcache.constructs.blocking.CacheEntryFactory to use for a self-populating cache.
void	setCacheEventListeners(java.util.Set<CacheEventListener> cacheEventListeners) Specify EhCache cache event listeners to registered with this cache.
void	setCacheManager(CacheManager cacheManager) Set a CacheManager from which to retrieve a named Cache instance.
void	setCacheName(java.lang.String cacheName) Set a name for which to retrieve or create a cache instance.
void	setDisabled(boolean disabled) Set whether this cache should be marked as disabled.
void	setDiskSpoolBufferSize(int diskSpoolBufferSize)
void	setSampledStatisticsEnabled(boolean sampledStatisticsEnabled) Set whether to enable EhCache's sampled statistics on this cache.
void	setStatisticsEnabled(boolean statisticsEnabled) Set whether to enable EhCache statistics on this cache.
void	setTimeToIdle(int timeToIdle)
void	setTimeToLive(int timeToLive)

Methods inherited from class java.lang.Object

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

Field Detail

setStatisticsAvailable

private static final boolean setStatisticsAvailable

logger

protected final Log logger

cacheManager

private CacheManager cacheManager

blocking

private boolean blocking

cacheEntryFactory

private CacheEntryFactory cacheEntryFactory

bootstrapCacheLoader

private BootstrapCacheLoader bootstrapCacheLoader

cacheEventListeners

private java.util.Set<CacheEventListener> cacheEventListeners

statisticsEnabled

private boolean statisticsEnabled

sampledStatisticsEnabled

private boolean sampledStatisticsEnabled

disabled

private boolean disabled

beanName

private java.lang.String beanName

cache

private Ehcache cache

Constructor Detail

EhCacheFactoryBean

public EhCacheFactoryBean()

Method Detail

setCacheManager

public void setCacheManager(CacheManager cacheManager)

Set a CacheManager from which to retrieve a named Cache instance. By default, CacheManager.getInstance() will be called.

Note that in particular for persistent caches, it is advisable to properly handle the shutdown of the CacheManager: Set up a separate EhCacheManagerFactoryBean and pass a reference to this bean property.

A separate EhCacheManagerFactoryBean is also necessary for loading EhCache configuration from a non-default config location.

See Also:

EhCacheManagerFactoryBean, net.sf.ehcache.CacheManager#getInstance

setCacheName

public void setCacheName(java.lang.String cacheName)

Set a name for which to retrieve or create a cache instance. Default is the bean name of this EhCacheFactoryBean.

setTimeToLive

public void setTimeToLive(int timeToLive)

See Also:

#setTimeToLiveSeconds(long)

setTimeToIdle

public void setTimeToIdle(int timeToIdle)

See Also:

#setTimeToIdleSeconds(long)

setDiskSpoolBufferSize

public void setDiskSpoolBufferSize(int diskSpoolBufferSize)

See Also:

#setDiskSpoolBufferSizeMB(int)

setBlocking

public void setBlocking(boolean blocking)

Set whether to use a blocking cache that lets read attempts block until the requested element is created.

If you intend to build a self-populating blocking cache, consider specifying a CacheEntryFactory.

See Also:

net.sf.ehcache.constructs.blocking.BlockingCache, setCacheEntryFactory(CacheEntryFactory)

setCacheEntryFactory

public void setCacheEntryFactory(CacheEntryFactory cacheEntryFactory)

Set an EhCache net.sf.ehcache.constructs.blocking.CacheEntryFactory to use for a self-populating cache. If such a factory is specified, the cache will be decorated with EhCache's net.sf.ehcache.constructs.blocking.SelfPopulatingCache.

The specified factory can be of type net.sf.ehcache.constructs.blocking.UpdatingCacheEntryFactory, which will lead to the use of an net.sf.ehcache.constructs.blocking.UpdatingSelfPopulatingCache.

Note: Any such self-populating cache is automatically a blocking cache.

See Also:

net.sf.ehcache.constructs.blocking.SelfPopulatingCache, net.sf.ehcache.constructs.blocking.UpdatingSelfPopulatingCache, net.sf.ehcache.constructs.blocking.UpdatingCacheEntryFactory

setBootstrapCacheLoader

public void setBootstrapCacheLoader(BootstrapCacheLoader bootstrapCacheLoader)

Set an EhCache net.sf.ehcache.bootstrap.BootstrapCacheLoader for this cache, if any.

setCacheEventListeners

public void setCacheEventListeners(java.util.Set<CacheEventListener> cacheEventListeners)

Specify EhCache cache event listeners to registered with this cache.

setStatisticsEnabled

public void setStatisticsEnabled(boolean statisticsEnabled)

Set whether to enable EhCache statistics on this cache.

Note: As of EhCache 2.7, statistics are enabled by default, and cannot be turned off. This setter therefore has no effect in such a scenario.

See Also:

net.sf.ehcache.Ehcache#setStatisticsEnabled

setSampledStatisticsEnabled

public void setSampledStatisticsEnabled(boolean sampledStatisticsEnabled)

Set whether to enable EhCache's sampled statistics on this cache.

Note: As of EhCache 2.7, statistics are enabled by default, and cannot be turned off. This setter therefore has no effect in such a scenario.

See Also:

net.sf.ehcache.Ehcache#setSampledStatisticsEnabled

setDisabled

public void setDisabled(boolean disabled)

Set whether this cache should be marked as disabled.

See Also:

net.sf.ehcache.Cache#setDisabled

setBeanName

public void setBeanName(java.lang.String name)

Description copied from interface: BeanNameAware

Set the name of the bean in the bean factory that created this bean.

Invoked after population of normal bean properties but before an init callback such as InitializingBean.afterPropertiesSet() or a custom init-method.

Specified by:

setBeanName in interface BeanNameAware

Parameters:

name - the name of the bean in the factory. Note that this name is the actual bean name used in the factory, which may differ from the originally specified name: in particular for inner bean names, the actual bean name might have been made unique through appending "#..." suffixes. Use the BeanFactoryUtils.originalBeanName(String) method to extract the original bean name (without suffix), if desired.

afterPropertiesSet

public void afterPropertiesSet()
                        throws CacheException,
                               java.io.IOException

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:

CacheException

java.io.IOException

createCache

protected Cache createCache()

Create a raw Cache object based on the configuration of this FactoryBean.

decorateCache

protected Ehcache decorateCache(Ehcache cache)

Decorate the given Cache, if necessary.

Parameters:

cache - the raw Cache object, based on the configuration of this FactoryBean

Returns:

the (potentially decorated) cache object to be registered with the CacheManager

getObject

public Ehcache 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<Ehcache>

Returns:

an instance of the bean (can be null)

See Also:

FactoryBeanNotInitializedException

getObjectType

public java.lang.Class<? extends Ehcache> getObjectType()

Predict the particular Ehcache implementation that will be returned from getObject() based on logic in createCache() and decorateCache(Ehcache) as orchestrated by afterPropertiesSet().

Specified by:

getObjectType in interface FactoryBean<Ehcache>

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<T>)

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<Ehcache>

Returns:

whether the exposed object is a singleton

See Also:

FactoryBean.getObject(), SmartFactoryBean.isPrototype()