防止重复提交

/**
 * 
 */
package XXX;

import java.util.*;
/**
 * @author Kevin Kitanski
 * 防止报文重复提交
 * @Description:TODO
 */
public class RepeatedMSGChecker {

	
	TreeMap<Date,String> mtm_cache=new TreeMap<Date,String>();
	long ml_second=20;
	int mnCacheLen=10;
	public RepeatedMSGChecker()
	{
		
	}
	public void regA(String psStr)
	{
		
	}
	static Map<String,RepeatedMSGChecker> tmAllMap=new HashMap<String,RepeatedMSGChecker>();
	public static boolean checkSubmit(String psCategory, String pMsg) 
	{
		RepeatedMSGChecker moInstance=null;
		if (tmAllMap.containsKey(psCategory)==false)
		{
			moInstance=new RepeatedMSGChecker();
			TreeMap<Date,String> tm_dt=new TreeMap<Date,String>();
			tmAllMap.put(psCategory, moInstance);
			moInstance.bCheckRepeated(pMsg);
			return false;
		}
		moInstance=tmAllMap.get(psCategory);
		return moInstance.bCheckRepeated(pMsg);
	}
	
	public boolean bCheckRepeated(String pmsg)
	{
		//https://programming.vip/docs/6-ways-to-prevent-repeated-data-submission-super-simple.html
		boolean rbReturn=false;
		synchronized (this) 
		{
			Date ahora=new Date();			
			cleanCache(ahora);
			if (mtm_cache.containsValue(pmsg)) 
				rbReturn=true;
			mtm_cache.put(ahora,pmsg);
		}
		return rbReturn;
	}
	public void cleanCache(Date pDate)
	{
		Set<Date> vs_date=new HashSet<Date>();
		for (Date vAddKey:this.mtm_cache.keySet())
			if (((pDate.getTime()-vAddKey.getTime())/1000)>ml_second)
				vs_date.add(vAddKey);
		for (Date wdate:vs_date)
			mtm_cache.remove(wdate);		
	}
	
}