package pay.infrastructure.helper;import org.apache.commons.collections.MapIterator;import org.apache.commons.collections.map.LRUMap;import java.util.ArrayList;/** * Created by wangxiaoming on 2016/3/14. */public class InMemoryCache<TK, TV> {    protected class CrunchifyCacheObject {        public long lastAccessed;        public TV value;        protected CrunchifyCacheObject(TV value) {            lastAccessed = System.currentTimeMillis();            this.value = http://www.mamicode.com/value;"unchecked")    public TV get(TK key) {        synchronized (crunchifyCacheMap) {            CrunchifyCacheObject c = (CrunchifyCacheObject) crunchifyCacheMap.get(key);            if (c == null) {                return null;            } else {                c.lastAccessed = System.currentTimeMillis();                return c.value;            }        }    }    public void remove(TK key) {        synchronized (crunchifyCacheMap) {            crunchifyCacheMap.remove(key);        }    }    public int size() {        synchronized (crunchifyCacheMap) {            return crunchifyCacheMap.size();        }    }    @SuppressWarnings("unchecked")    public void cleanup() {        long now = System.currentTimeMillis();        ArrayList<TK> deleteKey = null;        synchronized (crunchifyCacheMap) {            MapIterator itr = crunchifyCacheMap.mapIterator();            deleteKey = new ArrayList<>((crunchifyCacheMap.size() / 2) + 1);            while (itr.hasNext()) {                TK key = (TK) itr.next();                CrunchifyCacheObject c = (CrunchifyCacheObject) itr.getValue();                if (c != null && (now > (timeToLive + c.lastAccessed))) {                    deleteKey.add(key);                }            }        }        for (TK key : deleteKey) {            synchronized (crunchifyCacheMap) {                crunchifyCacheMap.remove(key);            }            Thread.yield();        }    }}