https://github.com/spring-projects/spring-framework: Spring Context Support (Spring IO)
  • Juergen Hoeller 
/*
 * Copyright 2002-2018 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.util.Set;

import net.sf.ehcache.Cache;
import net.sf.ehcache.CacheException;
import net.sf.ehcache.CacheManager;
import net.sf.ehcache.Ehcache;
import net.sf.ehcache.bootstrap.BootstrapCacheLoader;
import net.sf.ehcache.config.CacheConfiguration;
import net.sf.ehcache.constructs.blocking.BlockingCache;
import net.sf.ehcache.constructs.blocking.CacheEntryFactory;
import net.sf.ehcache.constructs.blocking.SelfPopulatingCache;
import net.sf.ehcache.constructs.blocking.UpdatingCacheEntryFactory;
import net.sf.ehcache.constructs.blocking.UpdatingSelfPopulatingCache;
import net.sf.ehcache.event.CacheEventListener;
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;
import org.springframework.lang.Nullable;


FactoryBean that creates a named EhCache Cache instance (or a decorator that implements the Ehcache interface), representing a cache region within an 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 5.0, Spring's EhCache support requires EhCache 2.10 or higher.

Author:Juergen Hoeller, Dmitriy Kopylenko
See Also:
Since:1.1.1
/**
 * {@link FactoryBean} that creates a named EhCache {@link net.sf.ehcache.Cache} instance
 * (or a decorator that implements the {@link net.sf.ehcache.Ehcache} interface),
 * representing a cache region within an EhCache {@link net.sf.ehcache.CacheManager}.
 *
 * <p>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.
 *
 * <p>Note: If the named Cache instance is found, the properties will be ignored and the
 * Cache instance will be retrieved from the CacheManager.
 *
 * <p>Note: As of Spring 5.0, Spring's EhCache support requires EhCache 2.10 or higher.
 *
 * @author Juergen Hoeller
 * @author Dmitriy Kopylenko
 * @since 1.1.1
 * @see #setCacheManager
 * @see EhCacheManagerFactoryBean
 * @see net.sf.ehcache.Cache
 */
public class EhCacheFactoryBean extends CacheConfiguration implements FactoryBean<Ehcache>, BeanNameAware, InitializingBean {

	protected final Log logger = LogFactory.getLog(getClass());

	@Nullable
	private CacheManager cacheManager;

	private boolean blocking = false;

	@Nullable
	private CacheEntryFactory cacheEntryFactory;

	@Nullable
	private BootstrapCacheLoader bootstrapCacheLoader;

	@Nullable
	private Set<CacheEventListener> cacheEventListeners;

	private boolean disabled = false;

	@Nullable
	private String beanName;

	@Nullable
	private Ehcache cache;


	public EhCacheFactoryBean() {
		setMaxEntriesLocalHeap(10000);
		setMaxEntriesLocalDisk(10000000);
		setTimeToLiveSeconds(120);
		setTimeToIdleSeconds(120);
	}


	
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:
/**
	 * Set a CacheManager from which to retrieve a named Cache instance.
	 * By default, {@code CacheManager.getInstance()} will be called.
	 * <p>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.
	 * <p>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.

/**
	 * 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) {
		setName(cacheName);
	}

	
Set the time to live.

See Also:
  • setTimeToLiveSeconds(long)
/**
	 * Set the time to live.
	 * @see #setTimeToLiveSeconds(long)
	 */
	public void setTimeToLive(int timeToLive) {
		setTimeToLiveSeconds(timeToLive);
	}

	
Set the time to idle.

See Also:
  • setTimeToIdleSeconds(long)
/**
	 * Set the time to idle.
	 * @see #setTimeToIdleSeconds(long)
	 */
	public void setTimeToIdle(int timeToIdle) {
		setTimeToIdleSeconds(timeToIdle);
	}

	
Set the disk spool buffer size (in MB).

See Also:
  • setDiskSpoolBufferSizeMB(int)
/**
	 * Set the disk spool buffer size (in MB).
	 * @see #setDiskSpoolBufferSizeMB(int)
	 */
	public void setDiskSpoolBufferSize(int diskSpoolBufferSize) {
		setDiskSpoolBufferSizeMB(diskSpoolBufferSize);
	}

	
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:
/**
	 * Set whether to use a blocking cache that lets read attempts block
	 * until the requested element is created.
	 * <p>If you intend to build a self-populating blocking cache,
	 * consider specifying a {@link #setCacheEntryFactory CacheEntryFactory}.
	 * @see net.sf.ehcache.constructs.blocking.BlockingCache
	 * @see #setCacheEntryFactory
	 */
	public void setBlocking(boolean blocking) {
		this.blocking = blocking;
	}

	
Set an EhCache CacheEntryFactory to use for a self-populating cache. If such a factory is specified, the cache will be decorated with EhCache's SelfPopulatingCache. 
The specified factory can be of type UpdatingCacheEntryFactory, which will lead to the use of an UpdatingSelfPopulatingCache. 
Note: Any such self-populating cache is automatically a blocking cache.

See Also:
/**
	 * Set an EhCache {@link 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
	 * {@link net.sf.ehcache.constructs.blocking.SelfPopulatingCache}.
	 * <p>The specified factory can be of type
	 * {@link net.sf.ehcache.constructs.blocking.UpdatingCacheEntryFactory},
	 * which will lead to the use of an
	 * {@link net.sf.ehcache.constructs.blocking.UpdatingSelfPopulatingCache}.
	 * <p>Note: Any such self-populating cache is automatically a blocking cache.
	 * @see net.sf.ehcache.constructs.blocking.SelfPopulatingCache
	 * @see net.sf.ehcache.constructs.blocking.UpdatingSelfPopulatingCache
	 * @see net.sf.ehcache.constructs.blocking.UpdatingCacheEntryFactory
	 */
	public void setCacheEntryFactory(CacheEntryFactory cacheEntryFactory) {
		this.cacheEntryFactory = cacheEntryFactory;
	}

	
Set an EhCache BootstrapCacheLoader for this cache, if any. 
/**
	 * Set an EhCache {@link net.sf.ehcache.bootstrap.BootstrapCacheLoader}
	 * for this cache, if any.
	 */
	public void setBootstrapCacheLoader(BootstrapCacheLoader bootstrapCacheLoader) {
		this.bootstrapCacheLoader = bootstrapCacheLoader;
	}

	
Specify EhCache cache event listeners to registered with this cache. 
/**
	 * Specify EhCache {@link net.sf.ehcache.event.CacheEventListener cache event listeners}
	 * to registered with this cache.
	 */
	public void setCacheEventListeners(Set<CacheEventListener> cacheEventListeners) {
		this.cacheEventListeners = cacheEventListeners;
	}

	
Set whether this cache should be marked as disabled.

See Also:
  • setDisabled.setDisabled
/**
	 * Set whether this cache should be marked as disabled.
	 * @see net.sf.ehcache.Cache#setDisabled
	 */
	public void setDisabled(boolean disabled) {
		this.disabled = disabled;
	}

	@Override
	public void setBeanName(String name) {
		this.beanName = name;
	}


	@Override
	public void afterPropertiesSet() throws CacheException {
		// If no cache name given, use bean name as cache name.
		String cacheName = getName();
		if (cacheName == null) {
			cacheName = this.beanName;
			if (cacheName != null) {
				setName(cacheName);
			}
		}

		// If no CacheManager given, fetch the default.
		if (this.cacheManager == null) {
			if (logger.isDebugEnabled()) {
				logger.debug("Using default EhCache CacheManager for cache region '" + cacheName + "'");
			}
			this.cacheManager = CacheManager.getInstance();
		}

		synchronized (this.cacheManager) {
			// Fetch cache region: If none with the given name exists, create one on the fly.
			Ehcache rawCache;
			boolean cacheExists = this.cacheManager.cacheExists(cacheName);

			if (cacheExists) {
				if (logger.isDebugEnabled()) {
					logger.debug("Using existing EhCache cache region '" + cacheName + "'");
				}
				rawCache = this.cacheManager.getEhcache(cacheName);
			}
			else {
				if (logger.isDebugEnabled()) {
					logger.debug("Creating new EhCache cache region '" + cacheName + "'");
				}
				rawCache = createCache();
				rawCache.setBootstrapCacheLoader(this.bootstrapCacheLoader);
			}

			if (this.cacheEventListeners != null) {
				for (CacheEventListener listener : this.cacheEventListeners) {
					rawCache.getCacheEventNotificationService().registerListener(listener);
				}
			}

			// Needs to happen after listener registration but before setStatisticsEnabled
			if (!cacheExists) {
				this.cacheManager.addCache(rawCache);
			}

			if (this.disabled) {
				rawCache.setDisabled(true);
			}

			Ehcache decoratedCache = decorateCache(rawCache);
			if (decoratedCache != rawCache) {
				this.cacheManager.replaceCacheWithDecoratedCache(rawCache, decoratedCache);
			}
			this.cache = decoratedCache;
		}
	}

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

/**
	 * Create a raw Cache object based on the configuration of this FactoryBean.
	 */
	protected Cache createCache() {
		return new Cache(this);
	}

	
Decorate the given Cache, if necessary.

Params:
  • cache – the raw Cache object, based on the configuration of this FactoryBean
Returns:the (potentially decorated) cache object to be registered with the CacheManager
/**
	 * Decorate the given Cache, if necessary.
	 * @param cache the raw Cache object, based on the configuration of this FactoryBean
	 * @return the (potentially decorated) cache object to be registered with the CacheManager
	 */
	protected Ehcache decorateCache(Ehcache cache) {
		if (this.cacheEntryFactory != null) {
			if (this.cacheEntryFactory instanceof UpdatingCacheEntryFactory) {
				return new UpdatingSelfPopulatingCache(cache, (UpdatingCacheEntryFactory) this.cacheEntryFactory);
			}
			else {
				return new SelfPopulatingCache(cache, this.cacheEntryFactory);
			}
		}
		if (this.blocking) {
			return new BlockingCache(cache);
		}
		return cache;
	}


	@Override
	@Nullable
	public Ehcache getObject() {
		return this.cache;
	}

	
Predict the particular Ehcache implementation that will be returned from getObject() based on logic in createCache() and decorateCache(Ehcache) as orchestrated by afterPropertiesSet(). 
/**
	 * Predict the particular {@code Ehcache} implementation that will be returned from
	 * {@link #getObject()} based on logic in {@link #createCache()} and
	 * {@link #decorateCache(Ehcache)} as orchestrated by {@link #afterPropertiesSet()}.
	 */
	@Override
	public Class<? extends Ehcache> getObjectType() {
		if (this.cache != null) {
			return this.cache.getClass();
		}
		if (this.cacheEntryFactory != null) {
			if (this.cacheEntryFactory instanceof UpdatingCacheEntryFactory) {
				return UpdatingSelfPopulatingCache.class;
			}
			else {
				return SelfPopulatingCache.class;
			}
		}
		if (this.blocking) {
			return BlockingCache.class;
		}
		return Cache.class;
	}

	@Override
	public boolean isSingleton() {
		return true;
	}

}