import java.util.Timer;
import java.util.TimerTask;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.Transaction;
public class Simple7 {
static int EXPIRED_SENCONDS = 60; //60 seconds expire, use thread to clear expired data
public static void main(String[] args) {
isServerRunning ();
Jedis client = getConnection();
client.set("user:zhangsan", "1"); //user表
client.hset("time:user", "user:zhangsan", expiredDate()); // time table - expiration time of record key
// Periodically delete expired data (user table)
Timer timer = new Timer ();
long delay = 1000;
long period = 30 * 1000;
TimerTask task = new ClearExpiredKeys(client);
timer.schedule(task, delay, period);
}
//redis transaction
private static void transaction(Jedis client){
Transaction tr = client.multi();
tr.hset("user:www", "query", "1");
tr.exec();
}
//ping
private static void isServerRunning(){
String host = "127.0.0.1";
Jedis jedis = new Jedis(host, 6379);
System.out.println("Connection to server sucessfully");
System.out.println("Server is running: "+jedis.ping());
}
static Jedis getConnection(){
String host = "127.0.0.1";
Jedis client = new Jedis(host, 6379);
return client;
}
static String expiredDate(){
Date d = new Date();
d.setSeconds (d.getSeconds () + EXPIRED_SENCONDS);
SimpleDateFormat f = new SimpleDateFormat("HHmmss");
return f.format(d);
}
}
class ClearExpiredKeys extends TimerTask{
private Jedis client;
public ClearExpiredKeys(Jedis client){
this.client = client;
}
@Override
public void run() {
Set<String> fields = client.hkeys("time:user");
Iterator<String> it = fields.iterator();
String field = null;
String expiredDate = null;
Date now = new Date();
SimpleDateFormat f = new SimpleDateFormat("HHmmss");
int inow = new Integer(f.format(now));
while(it.hasNext()){
field = it.next();
expiredDate = client.hget("time:user", field);
if(new Integer(expiredDate) < inow){
//client.del("user:zhangsan");
client.del(field);
client.hdel("time:user", field);
System.out.println("-- delete key" + field);
}
}
//client.close();
}
}