Spring scheduler - refresh

Schedulers are ways by which schedule a job to run at a predefined interval. 

Steps to implement scheduler

1. Include @EnableScheduling in the Main configuration file. 

@SpringBootApplication

@EnableScheduling

public class BasicsApplication 

1. Annotate with @Scheduled, specifying the criteria fixedRate. 

@Scheduled(fixedRate=5000)

public void displayScheduledTime() {

    System.out.println("The time is: " + dateFormat.format(new Date()));

    log.info("The time now is {} ", dateFormat.format(new Date()));

}

What else can you do using Spring schedulers. 

@Scheduled(fixedRate = 5000) 

• Runs the job every 5 seconds by comparing with the start. 

@Scheduled(fixedDelay = 5000)

• Runs the job by verifying with the delay instead of the start time. 

@Scheduled(initialDelay=10000, fixedRate = 500)

• Waits for 10 seconds and then executes the method every 500 ms. 

@Scheduled(cron="*/5 * * * * MON-FRI")

• Runs a scheduled cron job. 

@Async is a annotation which is used to indicate a method that it should be executed asynchronously.