写了一个Java的简单缓存模型

来源：互联网发布：网络固定电话软件编辑：程序博客网时间：2024/06/05 20:07

缓存操作接口

/** * 缓存操作接口 *  * @author xiudong * * @param <T> */public interface Cache<T> {/** * 刷新缓存数据 *  * @param key 缓存key * @param target 新数据 */void refresh(String key, T target);/** * 获取缓存 *  * @param key 缓存key * @return 缓存数据 */T getCache(String key);/** * 判断缓存是否过期 *  * @param key 缓存key * @return 如果缓存过期返回true， 否则返回false */Boolean isExpired(String key);/** * 设置缓存过期时间 *  * @param key 缓存key * @param millsec 缓存过期时间，单位：毫秒 */void setExpired(Long millsec);/** * 是否存在缓存对象 *  * @param key 缓存key * @return 存在返回true，不存在返回false */Boolean exist(String key);}

import java.util.Date;/** * 缓存实体 *  * @author xiudong * * @param <T> */public class LastCache<T> {/** * 上次缓存的数据 */private T data;/** * 最后刷新时间 */private long refreshtime;public LastCache(T data) {this(data, new Date().getTime());}public LastCache(T data, long refreshtime) {this.data = data;this.refreshtime = refreshtime;}public T getData() {return data;}public void setData(T data) {this.data = data;}public long getRefreshtime() {return refreshtime;}public void setRefreshtime(long refreshtime) {this.refreshtime = refreshtime;}}

import java.util.Date;import java.util.Map;import java.util.concurrent.ConcurrentHashMap;/** * 简单的缓存模型 *  * @author xiudong * * @param <T> */public class SimpleCached<T> implements Cache<T> {/** * 缓存数据索引 */private Map<String, LastCache<T>> cache = new ConcurrentHashMap<String, LastCache<T>>();/** * 缓存超时时间，单位：毫秒 */private Long expired = 0L;public SimpleCached() {this(5 * 1000 * 60L);}public SimpleCached(Long expired) {this.expired = expired;}@Overridepublic void refresh(String key, T target) {if (cache.containsKey(key)) {cache.remove(key);}cache.put(key, new LastCache<T>(target));}@Overridepublic T getCache(String key) {if (!this.exist(key)) {return null;}return cache.get(key).getData();}@Overridepublic Boolean isExpired(String key) {if (!this.exist(key)) {return null;}long currtime = new Date().getTime();long lasttime = cache.get(key).getRefreshtime();return (currtime - lasttime) > expired;}@Overridepublic void setExpired(Long millsec) {this.expired = millsec;}@Overridepublic Boolean exist(String key) {return cache.containsKey(key);}}

0 0