wlyy2.0/edu-article/JkEduWeb/.svn/pristine/61/61271c8c87bbcae81fefcef9199d01b7542c5968.svn-base

/**
 * 
 */
package com.yihu.util.mapRedis;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import net.sf.json.JSONObject;


/**
 * 使用Map实现redis的功能
 * @author lch
 *
 */
public class MapForRedisUtils implements Runnable,IRedisUtils {
	private static MapForRedisUtils mapForRedisUtils=null;
	private static Map<String,String> map=new ConcurrentHashMap<String,String>();
	private static Map<String,Long> expireMap=new ConcurrentHashMap<String,Long>();
	
	/**
	 * 存储值
	 * @param key 健
	 * @param val 值
	 * @param minute  过期时间(分钟)
	 */
	public  void setValue(String key,String val,int minute){
		map.put(key,val);
		expireMap.put(key,System.currentTimeMillis()+minute*60L*1000);
	}
	
	/**
	 * 获取值
	 * @param key 健
	 */
	public  String getValue(String key){
		try{
			return map.get(key);
		}catch(Exception e){
			e.printStackTrace();
			return null;
		}
	}	

	
	/**
	 * 获取过期时间（相对于1970-1-1的毫秒数)
	 * @param key 健
	 */
	public  long getExpireTime(String key){
		try{
			return expireMap.get(key);
		}catch(Exception e){
			e.printStackTrace();
			return 0;
		}
	}

	/**
	 * 设置过期时间（毫秒数)
	 * @param key 健
	 * @param expireMills 多少毫秒
	 */
	public  long setExpireTime(String key,int minute){
		try{
			return expireMap.put(key,System.currentTimeMillis()+minute*60L*1000);
		}catch(Exception e){
			e.printStackTrace();
			return 0;
		}
	}
	
	@Override
	public void run() {
		while(true){
			try{
				
				//移除过期的数据
				List<String> needRemoveKey=new ArrayList<String>();
				for (Map.Entry<String, Long> entry : MapForRedisUtils.expireMap.entrySet()) {
					if(entry.getValue()!=null&&entry.getValue()<=System.currentTimeMillis()){
						needRemoveKey.add(entry.getKey());
					}
				}
				for(String key:needRemoveKey){
					map.remove(key);
					expireMap.remove(key);
				}
				
				try {
					Thread.sleep(10000);
				} catch (Exception e1) {
					e1.printStackTrace();
				}
			}catch(Exception e){
				try {
					Thread.sleep(1000);
				} catch (Exception e1) {
					e1.printStackTrace();
				}
			}
		}
	}
	
	
	public synchronized IRedisUtils init(){
		if(mapForRedisUtils==null){
			
			mapForRedisUtils=new MapForRedisUtils();
			Thread t1=new Thread(mapForRedisUtils); 
			t1.start();
			
		}
		return mapForRedisUtils;
	}
	
	public static void main(String[] args) throws InterruptedException {
		IRedisUtils mapForRedisUtils=new MapForRedisUtils();
		mapForRedisUtils.init();//全局只要允许一次就好
		mapForRedisUtils.setValue("test", "1111111", 1);
		System.out.println(mapForRedisUtils.getValue("test"));
		Thread.sleep(2*60*1000);
		System.out.println("2 min after,val="+mapForRedisUtils.getValue("test"));
	}
}