Explain fixedDelay and fixedRate properties in Spring @Scheduled Annotation.

We can run scheduled tasks using Spring @Scheduled annotation however the properties fixedDelay and fixedRate determines the nature of execution.

The fixedDelay execute the annotated method with a fixed period in milliseconds between the end of the last invocation and the start of the next.

The fixedRate property execute the annotated method with a fixed period in milliseconds between invocations.

@Component
public class ScheduledService {

    int i=0;
    @Scheduled(fixedDelay = 2000) //in ms
    public void myFixedDelayScheduledMethod() {
        i++;
        System.out.println ("Running scheduled Task, iteration :"+ i  + " Thread name: "+ Thread.currentThread().getName()) ;
    }


    @Scheduled(fixedRate = 4000) //in ms
    public void myFixedRateScheduledMethod() {
        System.out.println ("Running fixedRate Task, Thread name: "+Thread.currentThread().getName());
    }
}

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