com.eshore.khala.utils.CacheNode Maven / Gradle / Ivy
package com.eshore.khala.utils;
/**
* 缓存节点
* @author eric
*
* @param 键
* @param 值
*/
public class CacheNode {
/**
* 键
*/
K key;
/**
* 值
*/
V value;
CacheNode next;
CacheNode pre;
long lastAccess=System.currentTimeMillis();
long cacheTime=0;
public long getCacheTime() {
return cacheTime;
}
public void setCacheTime(long cacheTime) {
this.cacheTime = cacheTime;
}
private boolean removed=false;
/**
* 是否过期
* @return expire
*/
public boolean isExpire(){
if(cacheTime==0)return false;
return System.currentTimeMillis()-lastAccess>=cacheTime;
}
/**
* 更新最后访问时间
*
*/
public void updateTime(){
lastAccess=System.currentTimeMillis();
}
/**
*
* @param k 键
* @param t 值
*/
public CacheNode(K k,V t){
key =k;
value =t;
}
/**
*
* @param k 键值
* @param t 值
* @param time 缓存时长，单位为豪秒
*/
public CacheNode(K k,V t,long time){
key =k;
value =t;
cacheTime=time;
}
public CacheNode(){
}
/**
* 移除
*/
public void remove(){
//if(next!=null)
if(next!=null)
next.pre=pre;
if(pre!=null)
pre.next=next;
next = null;
pre = null;
}
/**
* 手插到 n 节点前面
* @param n node
*/
public void insertBefore(CacheNode n){
next =n;
pre =n.pre;
n.pre=this;
}
/**
* 连接到 n 节点之后
* @param n node
*/
public void appendTo(CacheNode n){
/*if(n.next!=null){
next=n.next;
n.next.pre=this;
}*/
n.next=this;
pre=n;
//if(n.next==null&&n.pre==null)throw new RuntimeException("========01========"+n);
//if(next==null&&pre==null)throw new RuntimeException("========02========"+n);
}
/**
* 获取 键值
* @return key
*/
public K getKey(){
return key;
}
/**
* 设置键值
* @param k key
*/
public void setKey(K k){
key=k;
}
/**
* 获取值
* @return value
*/
public V getValue(){
if(removed)return null;
if(cacheTime==0)return value;
if(System.currentTimeMillis()-lastAccess>cacheTime)return null;
return value;
}
/**
* 设置值
* @param t value
*/
public void setValue(V t){
value =t;
}
public String toString(){
return "key:"+key+"\t"+"value:"+value+" "+(pre==null?"-pre:null":"pre:"+pre.key)+(next==null?"-next:null":"next:"+next.key);
}
/**
* 是否已移除
* @return is removed
*/
public boolean isRemoved() {
return removed;
}
/**
*
* @param removed is remove
*/
public void setRemoved(boolean removed) {
this.removed = removed;
}
}