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/** * 缓存池 * @author xiaoquan * @create 2015年3月13日 上午10:32:13 * @see */ public class CachePool { private static CachePool instance; //缓存池唯一实例 private static Map<String,Object> cacheItems; //缓存Map private CachePool(){ cacheItems = new HashMap<String,Object>(); } /** * 得到唯一实例 * @return */ public synchronized static CachePool getInstance(){ if (instance == null ){ instance = new CachePool(); } return instance; } /** * 清除所有Item缓存 */ public synchronized void clearAllItems(){ cacheItems.clear(); } /** * 获取缓存实体 * @param name * @return */ public synchronized Object getCacheItem(String name){ if (!cacheItems.containsKey(name)){ return null ; } CacheItem cacheItem = (CacheItem) cacheItems.get(name); if (cacheItem.isExpired()){ return null ; } return cacheItem.getEntity(); } /** * 存放缓存信息 * @param name * @param obj * @param expires */ public synchronized void putCacheItem(String name,Object obj, long expires){ if (!cacheItems.containsKey(name)){ cacheItems.put(name, new CacheItem(obj, expires)); } CacheItem cacheItem = (CacheItem) cacheItems.get(name); cacheItem.setCreateTime( new Date()); cacheItem.setEntity(obj); cacheItem.setExpireTime(expires); } public synchronized void putCacheItem(String name,Object obj){ putCacheItem(name,obj,- 1 ); } /** * 移除缓存数据 * @param name */ public synchronized void removeCacheItem(String name){ if (!cacheItems.containsKey(name)){ return ; } cacheItems.remove(name); } /** * 获取缓存数据的数量 * @return */ public int getSize(){ return cacheItems.size(); } } public class CacheItem {
private Date createTime = new Date(); //创建缓存的时间 private long expireTime = 1 ; //缓存期满的时间 private Object entity; //缓存的实体 public CacheItem(Object obj, long expires){ this .entity = obj; this .expireTime = expires; } public boolean isExpired(){ return (expireTime != - 1 && new Date().getTime()-createTime.getTime() > expireTime); } /** * 省略getter、setter方法 */ } |
原文: http://www.cnblogs.com/quanenmin/p/4335278.html
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原文地址:http://www.cnblogs.com/liangbo-/p/5169979.html