package com.jeecms.cms.service;
import net.sf.ehcache.Ehcache;
import net.sf.ehcache.Element;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Service;
import com.jeecms.cms.entity.main.ContentCount;
import com.jeecms.cms.manager.main.ContentCountMng;
/**
* 内容计数器缓存实现
*
* @author liufang
*
*/
@Service
public class ContentCountCacheImpl implements ContentCountCache, DisposableBean {
private Logger log = LoggerFactory.getLogger(ContentCountCacheImpl.class);
/**
* @see ContentCountCache#viewAndGet(Integer)
*/
public int[] viewAndGet(Integer id) {
ContentCount count = contentCountMng.findById(id);
if (count == null) {
return null;
}
Element e = cache.get(id);
Integer views;
if (e != null) {
views = (Integer) e.getValue() + 1;
} else {
views = 1;
}
cache.put(new Element(id, views));
refreshToDB();
return new int[] { views + count.getViews(), count.getComments(),
count.getDownloads(), count.getUps(), count.getDowns() };
}
private void refreshToDB() {
long time = System.currentTimeMillis();
if (time > refreshTime + interval) {
refreshTime = time;
int count = contentCountMng.freshCacheToDB(cache);
// 清除缓存
cache.removeAll();
log.info("refresh cache views to DB: {}", count);
}
}
/**
* 销毁BEAN时，缓存入库。
*/
public void destroy() throws Exception {
int count = contentCountMng.freshCacheToDB(cache);
log.info("Bean destroy.refresh cache views to DB: {}", count);
}
// 间隔时间
private int interval = 10 * 60 * 1000; // 10分钟
// 最后刷新时间
private long refreshTime = System.currentTimeMillis();
private ContentCountMng contentCountMng;
private Ehcache cache;
/**
* 刷新间隔时间
*
* @param interval
* 单位分钟
*/
public void setInterval(int interval) {
this.interval = interval * 60 * 1000;
}
@Autowired
public void setContentCountMng(ContentCountMng contentCountMng) {
this.contentCountMng = contentCountMng;
}
@Autowired
public void setCache(@Qualifier("contentCount") Ehcache cache) {
this.cache = cache;
}
}