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package com.holmos.cache.size;

import java.util.HashMap;
import java.util.LinkedList;

/**
 * 缓存的数据字典，里面存储两个字典：
 * 
 * 
  • 缓存中包含对象的类型所占用内存大小，类似C++中的sizeof计算
    • 
 * 
  • 缓存中的对象使用情况，保存对象和被引用次数的key-value对
    • 
 * 
 * @author 吴银龙([email protected])
 * */
public class DataDictionary {
	
	private static volatile DataDictionary dataDictionary;
	
	public static DataDictionary getInstance(){
		synchronized(DataDictionary.class){
			if(null==dataDictionary)
				dataDictionary=new DataDictionary();
			return dataDictionary;
		}
	}
	
	/**缓存中包含对象的类型所占用内存大小的字典*/
	private HashMap, Integer> typeSizeDic;
	/**缓存中的对象使用情况字典*/
	private HashMap objectUseDic;
	
	/**缓存中的创建顺序表*/
	private LinkedList eleCreatedOrderDic;
	
	private DataDictionary(){
		typeSizeDic=new HashMap, Integer>();
		objectUseDic=new HashMap();
		eleCreatedOrderDic=new LinkedList();
	}
	
	
	public HashMap, Integer> getTypeSizeDic() {
		return typeSizeDic;
	}
	
	public HashMap getObjectUseDic() {
		return objectUseDic;
	}
	
	public Integer getTypeSize(Class type){
		Integer size=typeSizeDic.get(type);
		if(null == size)
			return 0;
		return size;
	}
	public Integer getUserNum(Object key){
		Integer num= objectUseDic.get(key);
		if(null == num)
			return 0;
		return num;
	}
	public void putTypeSize(Class type,int size){
		typeSizeDic.put(type, size);
	}
	public void addObjectUse(Object value){
		if(objectUseDic.get(value)==null)
			objectUseDic.put(value, 1);
		else
			objectUseDic.put(value, objectUseDic.get(value)+1);
	}
	
	public void createNewEle(Object element){
		eleCreatedOrderDic.add(element);
	}
	public void removeEleBet(int start,int end){
		for(int i=start;i    
    
    
    
    
    
            
    
    
    
            
    

    
    
    
    




    
    
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