package lhm.hcy.guge.frameset.cache;
import java.util.*;
/**
* <p>Title: </p>
*
* <p>Description: 管理缓存</p>
* Deep blue 2008-11-28 think
* 可扩展的功能:当chche到内存溢出时必须清除掉最早期的一些缓存对象,这就要求对每个缓存对象保存创建时间
* <p>Copyright: Copyright (c) 2008</p>
*
* <p>Company: </p>
*
* @author Deepblue 2008-11-11
* @version 1.0
*/
public class CacheManager {
private static HashMap cacheMap = new HashMap();
//单实例构造方法
private CacheManager() {
super();
}
//获取布尔值的缓存
public static boolean getSimpleFlag(String key){
try{
return (Boolean) cacheMap.get(key);
}catch(NullPointerException e){
return false;
}
}
public static long getServerStartdt(String key){
try {
return (Long)cacheMap.get(key);
} catch (Exception ex) {
return 0;
}
}
//设置布尔值的缓存
public synchronized static boolean setSimpleFlag(String key,boolean flag){
if (flag && getSimpleFlag(key)) {//假如为真不允许被覆盖
return false;
}else{
cacheMap.put(key, flag);
return true;
}
}
public synchronized static boolean setSimpleFlag(String key,long serverbegrundt){
if (cacheMap.get(key) == null) {
cacheMap.put(key,serverbegrundt);
return true;
}else{
return false;
}
}
//得到缓存。同步静态方法
private synchronized static Cache getCache(String key) {