uk.gov.ofwat.fountain.aspect.cache.dao.generic.FindByCodeAspect.java Source code

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Here is the source code for uk.gov.ofwat.fountain.aspect.cache.dao.generic.FindByCodeAspect.java

Source

/*
 *  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.generic;

import java.util.Collections;
import java.util.Map;

import org.apache.commons.collections.map.LRUMap;
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.dao.EntityDao;
import uk.gov.ofwat.fountain.domain.Coded;

/**
 * log time taken to execute a method.
 * 
 */
@Aspect("perthis(uk.gov.ofwat.fountain.aspect.cache.dao.DaoCache.findByCodePC() ||"
        + "uk.gov.ofwat.fountain.aspect.cache.dao.DaoCache.deleteCodedPC() ||"
        + "uk.gov.ofwat.fountain.aspect.cache.dao.DaoCache.updateCodedPC())")
@Order(210)
public class FindByCodeAspect extends DaoCache {

    private Map<String, Object> cacheByCode;

    public Map<String, Object> getCache() {
        return cacheByCode;
    }

    public void setCache(Map cache) {
        cacheByCode = cache;
    }

    @SuppressWarnings({ "unchecked" })
    @Around("uk.gov.ofwat.fountain.aspect.cache.dao.DaoCache.findByCodePC()")
    public Object cacheOnFindByCode(ProceedingJoinPoint pjp) throws Throwable {
        if (!isEnabled()) {
            return pjp.proceed();
        }
        if (null == getCache()) {
            initialiseCache(pjp.getTarget().getClass());
        }

        if (null == cacheByCode) {
            cacheByCode = Collections.synchronizedMap(new LRUMap(getCacheSize()));
        }
        Object[] args = pjp.getArgs();
        String key = (String) args[0];

        Object retVal = null;
        if (cacheByCode.containsKey(key)) {
            retVal = cacheByCode.get(key);
        } else {
            retVal = pjp.proceed();
            if (null != retVal) {
                // don't store nulls.
                cacheByCode.put(key, (Object) retVal);
                incrementCache(pjp);
            }
        }

        return retVal;
    }

    @Around("uk.gov.ofwat.fountain.aspect.cache.dao.DaoCache.deleteCodedPC()")
    public void removeFromCacheOnDelete(ProceedingJoinPoint pjp) throws Throwable {

        if (!isEnabled()) {
            pjp.proceed();
            return;
        }
        Object[] args = pjp.getArgs();
        if (null != cacheByCode) {
            Integer key = (Integer) args[0];
            Coded coded = (Coded) ((EntityDao) pjp.getThis()).findById(key);
            String code = coded.getCode();
            pjp.proceed(args);
            cacheByCode.remove(code);
        } else {
            pjp.proceed(args);
        }
    }

    @Around("uk.gov.ofwat.fountain.aspect.cache.dao.DaoCache.updateCodedPC()")
    public void removeFromCacheOnUpdate(ProceedingJoinPoint pjp) throws Throwable {

        if (!isEnabled()) {
            pjp.proceed();
            return;
        }
        Object[] args = pjp.getArgs();
        if (null != cacheByCode) {
            Coded coded = (Coded) args[0];
            String code = coded.getCode();
            pjp.proceed(args);
            cacheByCode.remove(code);
        } else {
            pjp.proceed(args);
        }
    }
}