EDIT

/**

* Copyright (C) 2017 EDIT

* European Distributed Institute of Taxonomy

* http://www.e-taxonomy.eu

*

* The contents of this file are subject to the Mozilla Public License Version 1.1

* See LICENSE.TXT at the top of this package for the full license terms.

*/

package eu.etaxonomy.cdm.api.config;

import org.apache.log4j.Logger;

import org.springframework.beans.factory.DisposableBean;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Configuration;

import eu.etaxonomy.cdm.api.cache.CdmCacher;

import net.sf.ehcache.CacheManager;

import net.sf.ehcache.config.CacheConfiguration;

import net.sf.ehcache.config.CacheConfiguration.CacheEventListenerFactoryConfiguration;

import net.sf.ehcache.config.DiskStoreConfiguration;

import net.sf.ehcache.store.MemoryStoreEvictionPolicy;

/**

 *

 * @author a.kohlbecker

 * @since Feb 1, 2017

 *

 */

@Configuration

// @EnableCaching // for future use

public class EhCacheConfiguration implements DisposableBean {

    public static final Logger logger = Logger.getLogger(EhCacheConfiguration.class);

    @Autowired(required = false)

    public DiskStoreConfiguration diskStoreConfiguration = null;

    /**

     * The DiskStoreConfiguration can either be autowired or set explicite

     * @param diskStoreConfiguration the diskStoreConfiguration to set

     */

    public void setDiskStoreConfiguration(DiskStoreConfiguration diskStoreConfiguration) {

        this.diskStoreConfiguration = diskStoreConfiguration;

    }

    private CacheManager cacheManager = null;

    @Bean

    public CacheManager cacheManager(){

        net.sf.ehcache.config.Configuration conf = new net.sf.ehcache.config.Configuration();

        if(diskStoreConfiguration != null){

            logger.debug("creating CacheManager with disk store");

            conf.addDiskStore(diskStoreConfiguration);

        }

        conf.addDefaultCache(getDefaultCacheConfiguration());

        // creates a singleton

        cacheManager = CacheManager.create(conf);

        logger.debug("CacheManager created");

        return cacheManager;

    }

    /**

     * Returns the default cache configuration for the cache

     * named {@link CdmCacher#DEFAULT_CACHE_NAME "cdmDefaultCache"}

     *

     * @return

     */

    protected CacheConfiguration getDefaultCacheConfiguration() {

        CacheEventListenerFactoryConfiguration factory;

        // For a better understanding on how to size caches, refer to

        // http://ehcache.org/documentation/configuration/cache-size

        CacheConfiguration cc = new CacheConfiguration(CdmCacher.DEFAULT_CACHE_NAME, 500)

                .memoryStoreEvictionPolicy(MemoryStoreEvictionPolicy.LFU)

                .maxEntriesLocalHeap(10) // avoid ehache consuming too much heap

                .eternal(false)

                // default ttl and tti set to 2 hours

                .timeToLiveSeconds(60*60*2)

                .timeToIdleSeconds(60*60*2)

                .statistics(true);

        return cc;

    }

    @Override

    public void destroy() {

        if (cacheManager != null) {

            logger.info("Shutting down EhCache CacheManager");

            this.cacheManager.shutdown();

        }

    }

}