Schedule a task with Cron which allows dynamic update

Question

I use sprint boot 1.3, spring 4.2

In this class

@Service
public class PaymentServiceImpl implements PaymentService {
    ....
    @Transactional
    @Ove         


        

Answer 1

Just if someone still having this issue a better solution getting value from database whenever you want without many changes would be run cron every minute and get mod between current minute versus a configurated value delta from database, if this mod is equals to 0 means it has to run like if it is a mathematical multiple, so if you want it to run every 5 minutes for example delta should be 5.

A sample:

@Scheduled(cron = "0 */1 * * * *") //fire every minute
public void perform() {

    //running
    Integer delta = 5;//get this value from databse
    Integer minutes = getField(Calendar.MINUTE)//calendar for java 7;
    Boolean toRun = true;//you can also get this one from database to make it active or disabled
  
    toRun = toRun && (minutes % delta == 0);
    if (toRun && (!isRunning)) {
       isRunning = true;
       try {
         //do your logic here
       } catch (Exception e) { }
        isRunning = false;
    }
}

public Integer getField(int field) {

    Calendar now = Calendar.getInstance();

    if(field == Calendar.MONTH) {
        return now.get(field)+ 1; // Note: zero based!
    }else {
        return now.get(field);
    }
}

Hope this help :D