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Ehcache is an open source, standards-based cache used to boost performance, offload the database and simplify scalability. Ehcache is robust, proven and full-featured and this has made it the most widely-used Java-based cache.
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/**
 *  Copyright Terracotta, Inc.
 *
 *  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 net.sf.ehcache.management;

import javax.management.NotCompliantMBeanException;
import net.sf.ehcache.CacheException;
import net.sf.ehcache.Ehcache;
import net.sf.ehcache.hibernate.management.impl.EhcacheHibernateMbeanNames;
import net.sf.ehcache.util.CacheTransactionHelper;

import javax.management.MalformedObjectNameException;
import javax.management.ObjectName;
import java.io.Serializable;

/**
 * A Cache implementation that supports JMX MBeans
 * @author Greg Luck
 * @version $Id: Cache.java 9255 2014-08-26 08:38:01Z sund $
 * @since 1.3
 */
public class Cache implements CacheMBean, Serializable {

    private static final long serialVersionUID = 3477287016924524437L;
    

    /**
     * An Ehcache backing instance
     */
    private transient Ehcache cache;
    private ObjectName objectName;


    /**
     * A constructor for JCache.
     *
     * JCache is an adaptor for an Ehcache, and therefore requires an Ehcace in its constructor.
     * 
     * The {@link net.sf.ehcache.config.ConfigurationFactory} and clients can create these.
     * 

     * A client can specify their own settings here and pass the {@link Ehcache} object
     * into {@link net.sf.ehcache.CacheManager#addCache} to specify parameters other than the defaults.
     * 
     * Only the CacheManager can initialise them.
     *
     * @param cache An ehcache
     * @throws net.sf.ehcache.CacheException
     */
    public Cache(Ehcache cache) throws CacheException {
        this.cache = cache;
        objectName = createObjectName(cache.getCacheManager().toString(), cache.getName());
    }

    /**
     * Creates an object name using the scheme "net.sf.ehcache:type=Cache,CacheManager=,name="
     */
    static ObjectName createObjectName(String cacheManagerName, String cacheName) {
        ObjectName objectName;
        try {
            objectName = new ObjectName("net.sf.ehcache:type=Cache,CacheManager=" + cacheManagerName + ",name="
                    + EhcacheHibernateMbeanNames.mbeanSafe(cacheName));
        } catch (MalformedObjectNameException e) {
            throw new CacheException(e);
        }
        return objectName;
    }

    /**
     * Removes all cached items.
    *
    * @throws IllegalStateException if the cache is not {@link net.sf.ehcache.Status#STATUS_ALIVE}
    */
    public void removeAll() throws IllegalStateException, CacheException {
        CacheTransactionHelper.beginTransactionIfNeeded(cache);
        try {
            cache.removeAll();
        } finally {
            CacheTransactionHelper.commitTransactionIfNeeded(cache);
        }
    }

    /**
     * Flushes all cache items from memory to the disk store, and from the DiskStore to disk.
     *
     * @throws IllegalStateException if the cache is not {@link net.sf.ehcache.Status#STATUS_ALIVE}
     */
    public void flush() throws IllegalStateException, CacheException {
        cache.flush();
    }

    /**
     * Gets the status attribute of the Cache.
     *
     * @return The status value as a String from the Status enum class
     */
    public String getStatus() {
        return cache.getStatus().toString();
    }

    /**
     * Gets the cache name.
     */
    public String getName() {
        return cache.getName();
    }

    /**
     * Is the cache configured with Terracotta clustering?
     */
    public boolean isTerracottaClustered() {
        return cache.getCacheConfiguration().isTerracottaClustered();
    }

    /**
     * May the cache contain elements which the SizeOf engine could not fully size?
     */
    public boolean hasAbortedSizeOf() {
        return cache.hasAbortedSizeOf();
    }

    /**
     * Gets the JMX read-only CacheConfiguration
     */
    public CacheConfiguration getCacheConfiguration() {
        return new CacheConfiguration(cache);
    }

    /**
     * Gets the JMX cache statistics
     */
    public CacheStatistics getStatistics() {
        return new CacheStatistics(cache);
    }

    /**
     * Gets the JMX store bean
     */
    Store getStore() throws NotCompliantMBeanException {
        return Store.getBean(cache);
    }

    /**
     * @return the object name for this MBean
     */
    ObjectName getObjectName() {
        return objectName;
    }
}