uk.gov.ofwat.fountain.aspect.cache.dao.specific.itemPropertiesDao.FindByItemAndModelAspect.java Source code

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Here is the source code for uk.gov.ofwat.fountain.aspect.cache.dao.specific.itemPropertiesDao.FindByItemAndModelAspect.java

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/*
 *  Copyright (C) 2009 Water Services Regulation Authority (Ofwat)
 *
 *  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; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  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.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
package uk.gov.ofwat.fountain.aspect.cache.dao.specific.itemPropertiesDao;

import java.util.Map;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.core.annotation.Order;

import uk.gov.ofwat.fountain.aspect.cache.dao.DaoCache;
import uk.gov.ofwat.fountain.aspect.cache.dao.UpdateListener;
import uk.gov.ofwat.fountain.dao.ItemDao;

@Aspect
@Order(241)
public class FindByItemAndModelAspect extends DaoCache implements UpdateListener {
    private Map<String, Object> cacheByItemAndModel;

    @SuppressWarnings("unchecked")
    @Override
    public Map getCache() {
        return cacheByItemAndModel;
    }

    @Override
    @SuppressWarnings("unchecked")
    public void setCache(Map cache) {
        cacheByItemAndModel = cache;
    }

    public void updateOccurred() {
        initialiseCache();
    }

    /**
     * Because we want to invalidate on changes to item
     * @param itemDao
     */
    public void setItemDao(ItemDao itemDao) {
        itemDao.addItemUpdateListener(this);
    }

    @Around("execution(* uk.gov.ofwat.fountain.dao.ItemPropertiesDao+.findByItemAndModel(int, int))")
    public Object cacheOnFindByItemAndModel(ProceedingJoinPoint pjp) throws Throwable {
        if (!isEnabled()) {
            return pjp.proceed();
        }
        if (null == getCache()) {
            initialiseCache(pjp.getTarget().getClass());
        }

        Object[] args = pjp.getArgs();
        String key = (Integer) args[0] + "-" + (Integer) args[1];

        Object retVal = null;
        if (cacheByItemAndModel.containsKey(key)) {
            retVal = cacheByItemAndModel.get(key);
        } else {
            retVal = pjp.proceed();
            if (null != retVal) {
                // don't store nulls. Items may be added to the model later. 
                cacheByItemAndModel.put(key, (Object) retVal);
                incrementCache(pjp);
            }
        }
        return retVal;
    }
}