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1
22 package com.geinuke.util.collection;
23
24
25 import java.util.*;
26
27
28 public class SimpleCache extends Hashtable implements Runnable  {
29 protected Hashtable timers=null;
30 protected ArrayList parents=null;
31 protected String name=null;
32 public SimpleCache(String name){
33 super();
34 this.name=name;
35 this.timers=new Hashtable();
36 parents=new ArrayList();
37 Thread t=new Thread (this);
38 t.start();
39 }
40 public void addParent(SimpleCache sc){
41 this.parents.add(sc);
42 }
43
44 public void run(){
45 while(true){
46
47 try{
48 Thread.sleep(100000);
49 Enumeration e=super.keys();
50 Object kk=null;
51 Long t=null;
52 while(e.hasMoreElements()){
53 kk=e.nextElement();
54 t=(Long )this.timers.get(kk);
55 if(t.longValue()< (System.currentTimeMillis() / 1000 ) ){
56 this.remove(kk);
57 }
58 }
59 }catch(Exception e){}
60 }
61 }
62
63 public synchronized void clear(){
64 SimpleCache sc=null;
65 System.out.println("SimpleCache.clear(), clearing "+name);
66 for(int i=0;i<this.parents.size();i++){
67 sc=(SimpleCache)this.parents.get(i);
68 sc.clear();
69 }
70 super.clear();
71 this.timers.clear();
72 }
73
74 public synchronized void put(Object key,Object value,long durata){
75 Long lo=new Long (durata);
76 this.put(key,value);
77 long start=System.currentTimeMillis()/1000;
78 long secs=0;
79 secs=start+ durata;
80 this.timers.put(key,new Long (secs));
81
82 }
83
84 public synchronized Object remove(Object k){
85 this.timers.remove(k);
86 return super.remove(k);
87 }
88
89 }
90 |
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