org.springframework.cache.ehcache.EhCacheFactoryBean Maven / Gradle / Ivy
/*
* Copyright 2002-2005 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.cache.ehcache;
import java.io.IOException;
import net.sf.ehcache.Cache;
import net.sf.ehcache.CacheException;
import net.sf.ehcache.CacheManager;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.factory.BeanNameAware;
import org.springframework.beans.factory.FactoryBean;
import org.springframework.beans.factory.InitializingBean;
/**
* FactoryBean that creates a named EHCache Cache object, representing a cache region.
*
* 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 CacheManager.
*
* @author Dmitriy Kopylenko
* @author Juergen Hoeller
* @since 1.1.1
* @see #setCacheManager
* @see EhCacheManagerFactoryBean
* @see net.sf.ehcache.Cache
*/
public class EhCacheFactoryBean implements FactoryBean, BeanNameAware, InitializingBean {
protected final Log logger = LogFactory.getLog(getClass());
private CacheManager cacheManager;
private String cacheName;
private int maxElementsInMemory = 10000;
private boolean overflowToDisk = true;
private boolean eternal = false;
private int timeToLive = 120;
private int timeToIdle = 120;
private boolean diskPersistent = false;
private int diskExpiryThreadIntervalSeconds = 120;
private String beanName;
private Cache cache;
/**
* 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 EhCacheManagerFactoryBean
* @see net.sf.ehcache.CacheManager#getInstance
*/
public void setCacheManager(CacheManager cacheManager) {
this.cacheManager = cacheManager;
}
/**
* Set a name for which to retrieve or create a cache instance.
* Default is the bean name of this EhCacheFactoryBean.
*/
public void setCacheName(String cacheName) {
this.cacheName = cacheName;
}
/**
* Specify the maximum number of cached objects in memory.
* Default is 10000 elements.
*/
public void setMaxElementsInMemory(int maxElementsInMemory) {
this.maxElementsInMemory = maxElementsInMemory;
}
/**
* Set whether elements can overflow to disk when the in-memory cache
* has reached the maximum size limit. Default is true.
*/
public void setOverflowToDisk(boolean overflowToDisk) {
this.overflowToDisk = overflowToDisk;
}
/**
* Set whether elements are eternal. If true, timeouts are ignored
* and the element is never expired. Default is false.
*/
public void setEternal(boolean eternal) {
this.eternal = eternal;
}
/**
* Set t he time in seconds to live for an element before it expires,
* i.e. the maximum time between creation time and when an element expires.
* It is only used if the element is not eternal. Default is 120 seconds.
*/
public void setTimeToLive(int timeToLive) {
this.timeToLive = timeToLive;
}
/**
* Set the time in seconds to idle for an element before it expires
* i.e. the maximum amount of time between accesses before an element expires.
* It is only used if the element is not eternal. Default is 120 seconds.
*/
public void setTimeToIdle(int timeToIdle) {
this.timeToIdle = timeToIdle;
}
/**
* Set whether the disk store persists between restarts of the Virtual Machine.
* The default is false.
*/
public void setDiskPersistent(boolean diskPersistent) {
this.diskPersistent = diskPersistent;
}
/**
* Set the number of seconds between runs of the disk expiry thread.
* The default is 120 seconds.
*/
public void setDiskExpiryThreadIntervalSeconds(int diskExpiryThreadIntervalSeconds) {
this.diskExpiryThreadIntervalSeconds = diskExpiryThreadIntervalSeconds;
}
public void setBeanName(String name) {
this.beanName = name;
}
public void afterPropertiesSet() throws CacheException, IOException {
// If no CacheManager given, fetch the default.
if (this.cacheManager == null) {
if (logger.isInfoEnabled()) {
logger.info("Using default EHCache CacheManager for cache region '" + this.cacheName + "'");
}
this.cacheManager = CacheManager.getInstance();
}
// If no cache name given, use bean name as cache name.
if (this.cacheName == null) {
this.cacheName = this.beanName;
}
// Fetch cache region: If none with the given name exists,
// create one on the fly.
if (this.cacheManager.cacheExists(this.cacheName)) {
if (logger.isInfoEnabled()) {
logger.info("Using existing EHCache cache region '" + this.cacheName + "'");
}
this.cache = this.cacheManager.getCache(this.cacheName);
}
else {
if (logger.isInfoEnabled()) {
logger.info("Creating new EHCache cache region '" + this.cacheName + "'");
}
// Manually construct the named Cache instance and add it to CacheManager.
// Use simplified constructor if not diskPersistent (an EHCache 1.0 property),
// to stay compatible with EHCache 0.9.
if (this.diskPersistent) {
this.cache = new Cache(
this.cacheName, this.maxElementsInMemory, this.overflowToDisk,
this.eternal, this.timeToLive, this.timeToIdle,
this.diskPersistent, this.diskExpiryThreadIntervalSeconds);
}
else {
this.cache = new Cache(
this.cacheName, this.maxElementsInMemory, this.overflowToDisk,
this.eternal, this.timeToLive, this.timeToIdle);
}
this.cacheManager.addCache(this.cache);
}
}
public Object getObject() {
return this.cache;
}
public Class getObjectType() {
return (this.cache != null ? this.cache.getClass() : Cache.class);
}
public boolean isSingleton() {
return true;
}
}