public class

EhCacheFactoryBean

extends Object
implements BeanNameAware FactoryBean<T> InitializingBean
java.lang.Object
   ↳ org.springframework.cache.ehcache.EhCacheFactoryBean

Class Overview

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 3.0, Spring's EHCache support requires EHCache 1.3 or higher.

Summary

Fields
protected final Log logger
Public Constructors
EhCacheFactoryBean()
Public Methods
void afterPropertiesSet()
Invoked by a BeanFactory after it has set all bean properties supplied (and satisfied BeanFactoryAware and ApplicationContextAware).
Ehcache getObject()
Return an instance (possibly shared or independent) of the object managed by this factory.
Class<? extends Ehcache> 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? That is, will 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.

void setBeanName(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(Set<CacheEventListener> cacheEventListeners)
Specify EHCache net.sf.ehcache.event.CacheEventListener 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(String cacheName)
Set a name for which to retrieve or create a cache instance.
void setClearOnFlush(boolean clearOnFlush)
Set whether the memory store should be cleared when flush is called on the cache.
void setDiskExpiryThreadIntervalSeconds(int diskExpiryThreadIntervalSeconds)
Set the number of seconds between runs of the disk expiry thread.
void setDiskPersistent(boolean diskPersistent)
Set whether the disk store persists between restarts of the Virtual Machine.
void setDiskSpoolBufferSize(int diskSpoolBufferSize)
Set the amount of memory to allocate the write buffer for puts to the disk store.
void setEternal(boolean eternal)
Set whether elements are considered as eternal.
void setMaxElementsInMemory(int maxElementsInMemory)
Specify the maximum number of cached objects in memory.
void setMaxElementsOnDisk(int maxElementsOnDisk)
Specify the maximum number of cached objects on disk.
void setMemoryStoreEvictionPolicy(MemoryStoreEvictionPolicy memoryStoreEvictionPolicy)
Set the memory style eviction policy for this cache.
void setOverflowToDisk(boolean overflowToDisk)
Set whether elements can overflow to disk when the in-memory cache has reached the maximum size limit.
void setTimeToIdle(int timeToIdle)
Set the time in seconds to idle for an element before it expires, that is, the maximum amount of time between accesses before an element expires.
void setTimeToLive(int timeToLive)
Set the time in seconds to live for an element before it expires, i.e.
Protected Methods
Cache createCache()
Create a raw Cache object based on the configuration of this FactoryBean.
Ehcache decorateCache(Ehcache cache)
Decorate the given Cache, if necessary.
[Expand]
Inherited Methods
From class java.lang.Object
From interface org.springframework.beans.factory.BeanNameAware
From interface org.springframework.beans.factory.FactoryBean
From interface org.springframework.beans.factory.InitializingBean

Fields

protected final Log logger

Public Constructors

public EhCacheFactoryBean ()

Public Methods

public void afterPropertiesSet ()

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.

Throws
CacheException
IOException

public Ehcache getObject ()

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.

Returns
  • an instance of the bean (can be null)

public Class<? extends Ehcache> getObjectType ()

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.

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

public boolean isSingleton ()

Is the object managed by this factory a singleton? That is, will 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 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.

Returns
  • whether the exposed object is a singleton

public void setBeanName (String name)

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 afterPropertiesSet() or a custom init-method.

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.

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

public void setBootstrapCacheLoader (BootstrapCacheLoader bootstrapCacheLoader)

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

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

public void setCacheEventListeners (Set<CacheEventListener> cacheEventListeners)

Specify EHCache net.sf.ehcache.event.CacheEventListener cache event listeners to registered with this cache.

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

public void setCacheName (String cacheName)

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

public void setClearOnFlush (boolean clearOnFlush)

Set whether the memory store should be cleared when flush is called on the cache. Default is "true".

public void setDiskExpiryThreadIntervalSeconds (int diskExpiryThreadIntervalSeconds)

Set the number of seconds between runs of the disk expiry thread. Default is 120 seconds.

public void setDiskPersistent (boolean diskPersistent)

Set whether the disk store persists between restarts of the Virtual Machine. Default is "false".

public void setDiskSpoolBufferSize (int diskSpoolBufferSize)

Set the amount of memory to allocate the write buffer for puts to the disk store. Default is 0.

public void setEternal (boolean eternal)

Set whether elements are considered as eternal. If "true", timeouts are ignored and the element is never expired. Default is "false".

public void setMaxElementsInMemory (int maxElementsInMemory)

Specify the maximum number of cached objects in memory. Default is 10000 elements.

public void setMaxElementsOnDisk (int maxElementsOnDisk)

Specify the maximum number of cached objects on disk. Default is 10000000 elements.

public void setMemoryStoreEvictionPolicy (MemoryStoreEvictionPolicy memoryStoreEvictionPolicy)

Set the memory style eviction policy for this cache.

Supported values are "LRU", "LFU" and "FIFO", according to the constants defined in EHCache's MemoryStoreEvictionPolicy class. Default is "LRU".

public void setOverflowToDisk (boolean overflowToDisk)

Set whether elements can overflow to disk when the in-memory cache has reached the maximum size limit. Default is "true".

public void setTimeToIdle (int timeToIdle)

Set the time in seconds to idle for an element before it expires, that is, the maximum amount of time between accesses before an element expires.

This is only used if the element is not eternal. Default is 120 seconds.

public void setTimeToLive (int timeToLive)

Set the time in seconds to live for an element before it expires, i.e. the maximum time between creation time and when an element expires.

This is only used if the element is not eternal. Default is 120 seconds.

Protected Methods

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.

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