根据某种条件定时删除Map中的key

根据某种条件定时删除Map中的key,主要用于一些定时删除key的操作
应该是在模仿httpsession的环境中应用比较多

package pack;

import java.util.HashMap;
import java.util.Map;
/**
*
* @author Administrator
*
*/
public abstract class ExecuteTimeTask extends Thread {

private long time=60*100;//定时时间
private Map map=null;
/**
* condition is true, execute the clean operation
* @param key
* @param value
* @return
*/
public abstract boolean condition(Object key,Object value);

/* (non-Javadoc)
* @see java.lang.Thread#run()
*/
public void run() {
for(;;){
//
try {
synchronized (this) {
this.wait(time);
}
} catch (InterruptedException e) {
e.printStackTrace();
}

if(map==null||map.size()<1){
continue;
}

for(java.util.Iterator it=map.entrySet().iterator();it.hasNext();){
Map.Entry entry=(Map.Entry)it.next();
if(condition(entry.getKey(),entry.getValue())){
it.remove();
};

}

}
}

/**
* @param args
*/
public static void main(String[] args) {
ExecuteTimeTask t=new ExecuteTimeTask(){

public boolean condition(Object key, Object value) {
return key.toString().equals(value.toString())?true:false;
//return true;
}

};
Map m=new HashMap();
m.put("a", "2");
//m.put("2", "2");
t.setMap(m);
t.setTime(1000);

t.start();
long l=0;
for(;;){

try {
synchronized (Thread.currentThread()) {
Thread.currentThread().wait(2000);
}
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.err.println("before--"+m+"---"+java.lang.Runtime.getRuntime().totalMemory());
m.put(l+"", l+"");
l++;
System.err.println("after"+m+"---nanotime--"+System.nanoTime()+"-----"+System.currentTimeMillis());
}

}

/**
* @return the map
*/
public Map getMap() {
return map;
}

/**
* @param map the map to set
*/
public void setMap(Map map) {
this.map = map;
}

/**
* @return the time
*/
public long getTime() {
return time;
}

/**
* @param time the time to set
*/
public void setTime(long time) {
this.time = time;
}

}