com.clustercontrol.maintenance.factory.HinemosPropertyInfoCache.java Source code

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Here is the source code for com.clustercontrol.maintenance.factory.HinemosPropertyInfoCache.java

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/*
    
Copyright (C) 2007 NTT DATA Corporation
    
This program is free software; you can redistribute it and/or
Modify it under the terms of the GNU General Public License
as published by the Free Software Foundation, version 2.
    
This program is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied
warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE.  See the GNU General Public License for more details.
    
 */

package com.clustercontrol.maintenance.factory;

import java.io.Serializable;
import java.util.HashMap;
import java.util.List;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.clustercontrol.commons.util.AbstractCacheManager;
import com.clustercontrol.commons.util.CacheManagerFactory;
import com.clustercontrol.commons.util.ICacheManager;
import com.clustercontrol.commons.util.ILock;
import com.clustercontrol.commons.util.ILockManager;
import com.clustercontrol.commons.util.JpaTransactionManager;
import com.clustercontrol.commons.util.LockManagerFactory;
import com.clustercontrol.maintenance.model.HinemosPropertyInfo;
import com.clustercontrol.maintenance.util.QueryUtil;
import com.clustercontrol.util.HinemosTime;

/**
 * 
 * ???
 * 
 * @since 5.0.0
 * @version 5.0.0
 * 
 */
public class HinemosPropertyInfoCache {
    private static Log log = LogFactory.getLog(HinemosPropertyInfoCache.class);

    private static final ILock _lock;

    static {
        ILockManager lockManager = LockManagerFactory.instance().create();
        _lock = lockManager.create(HinemosPropertyInfoCache.class.getName());

        try {
            _lock.writeLock();

            HashMap<String, HinemosPropertyInfo> cache = getCache();
            if (cache == null) { // not null when clustered
                refresh();
            }
        } finally {
            _lock.writeUnlock();
        }
    }

    @SuppressWarnings("unchecked")
    private static HashMap<String, HinemosPropertyInfo> getCache() {
        ICacheManager cm = CacheManagerFactory.instance().create();
        Serializable cache = cm.get(AbstractCacheManager.KEY_COMMON_PROPERTY);
        if (log.isDebugEnabled())
            log.debug("get cache " + AbstractCacheManager.KEY_COMMON_PROPERTY + " : " + cache);
        return cache == null ? null : (HashMap<String, HinemosPropertyInfo>) cache;
    }

    private static void storeCache(HashMap<String, HinemosPropertyInfo> newCache) {
        ICacheManager cm = CacheManagerFactory.instance().create();
        if (log.isDebugEnabled())
            log.debug("store cache " + AbstractCacheManager.KEY_COMMON_PROPERTY + " : " + newCache);
        cm.store(AbstractCacheManager.KEY_COMMON_PROPERTY, newCache);
    }

    private HinemosPropertyInfoCache() {
    }

    /**
     * ?
     * 
     * @param key ?
     * @return 
     */
    public static HinemosPropertyInfo getProperty(String key) {
        // ?????????????????????????
        // (?????????????????????????)
        HashMap<String, HinemosPropertyInfo> cache = getCache();
        return cache == null ? null : cache.get(key);
    }

    /**
     * 
     */
    public static synchronized void refresh() {
        try {
            _lock.writeLock();

            long startTime = HinemosTime.currentTimeMillis();

            new JpaTransactionManager().getEntityManager().clear();
            HashMap<String, HinemosPropertyInfo> cache = createHinemosPropertyInfoMap();
            storeCache(cache);

            log.info(String.format("refresh: %dms size=%d", HinemosTime.currentTimeMillis() - startTime,
                    cache.size()));
        } finally {
            _lock.writeUnlock();
        }
    }

    private static HashMap<String, HinemosPropertyInfo> createHinemosPropertyInfoMap() {
        HashMap<String, HinemosPropertyInfo> infoMap = new HashMap<String, HinemosPropertyInfo>();
        List<HinemosPropertyInfo> entities = QueryUtil.getAllHinemosProperty_None();
        for (HinemosPropertyInfo entity : entities) {
            infoMap.put(entity.getKey(), entity);
        }
        return infoMap;
    }
}