一个简单的缓存管理

package cn.cche.cache;import java.io.Serializable;import cn.cche.util.Utils;import cn.cche.util.Const;/** * @author chexingyou * @date   2013-5-23 */public class CacheValue implements Serializable {private static final long serialVersionUID = 1L;private Object obj;private long time;private long priod;public CacheValue(){}public CacheValue(Object obj, long time) {this.obj = obj;this.time = time;this.priod = Const.CachePriod.normal;}public CacheValue(Object obj, long time,long priod) {this.obj = obj;this.time = time;this.priod = priod;}public Object getObj() {return obj;}public void setObj(Object obj) {this.obj = obj;}public long getTime() {return time;}public void setTime(long time) {this.time = time;}public long getPriod() {return priod;}public void setPriod(long priod) {this.priod = priod;}public String toString(){return Utils.toString(this);}}

package cn.cche.cache;import java.io.Serializable;import java.util.HashMap;import java.util.Iterator;import java.util.Map;import java.util.Timer;import java.util.TimerTask;import net.sourceforge.sizeof.SizeOf;/** * @author chexingyou * @date 2013-5-23 */public class CacheMgr {private static Map<Serializable, Map<Serializable, CacheValue>> cache = new HashMap<Serializable, Map<Serializable, CacheValue>>();private CacheMgr() {}static {Timer timer = new Timer();TimerTask task = new TimerTask() {public void run() {System.out.println("定时器工作中...");Iterator<Serializable> it = cache.keySet().iterator();while (it.hasNext()) {Serializable regionkey = it.next();Map<Serializable, CacheValue> regionCache = cache.get(regionkey);Iterator<Serializable> regionit = regionCache.keySet().iterator();while (regionit.hasNext()) {Serializable key = regionit.next();CacheValue value = regionCache.get(key);if ((System.currentTimeMillis() - value.getTime()) / 1000 > value.getPriod()) {// evict(regionkey,key);System.out.println("清除缓存: " + regionkey + "/" + key);regionit.remove();}}}}};timer.schedule(task, 0, 5000);}public static Object get(Serializable region, Serializable key) {// sizeOf();Map<Serializable, CacheValue> regionCache = cache.get(region);CacheValue value = null;if (region != null && key != null) {regionCache = cache.get(region);if (regionCache == null)return null;value = regionCache.get(key);if (value != null) {if ((System.currentTimeMillis() - value.getTime()) / 1000 > value.getPriod()) {evict(region, key);value = null;} else {System.out.println("获取缓存: " + region + "/" + key);}}}return value == null ? null : value.getObj();}public static void put(Serializable region, Serializable key, CacheValue value) {if (key != null && value != null) {Map<Serializable, CacheValue> map = new HashMap<Serializable, CacheValue>();map.put(key, value);Map<Serializable, CacheValue> regionCache = cache.get(region);if (regionCache == null) {cache.put(region, map);} else {regionCache.putAll(map);}System.out.println("更新缓存: " + region + "/" + key);}}public static void evict(Object region, Object key) {if (region != null && key != null) {Map<Serializable, CacheValue> regionCache = cache.get(region);if (regionCache != null)cache.get(region).remove(key);System.out.println("清除缓存: " + region + "/" + key);}}public static void sizeOf() {String size = SizeOf.humanReadable(SizeOf.deepSizeOf(cache));System.out.println("缓存大小:" + size);}}