What's the difference between fixed rate and fixed delay in Spring Scheduled annotation?

Question

I am implementing scheduled tasks using Spring, and I see there are two types of config options for time that schedule work again from the last call. What is the difference between these two types?

 @Scheduled(fixedDelay = 5000)  public void doJobDelay() {      // do anything  }   @Scheduled(fixedRate = 5000)  public void doJobRate() {      // do anything  } 

Answer 1

• fixedRate : makes Spring run the task on periodic intervals even if the last invocation may still be running.
• fixedDelay : specifically controls the next execution time when the last execution finishes.

In code:

@Scheduled(fixedDelay=5000) public void updateEmployeeInventory(){     System.out.println("employee inventory will be updated once only the last updated finished ");     /**      * add your scheduled job logic here      */ }   @Scheduled(fixedRate=5000) public void updateEmployeeInventory(){     System.out.println("employee inventory will be updated every 5 seconds from prior updated has stared, regardless it is finished or not");     /**      * add your scheduled job logic here      */ }