How to run methods in certain time windows

I have a microservice that will receive a message, something like this:

["00:12", "12:20", "15:40"]

Are there any out-of-the-box solutions to allow methods to run at a given time each day? Using cron from Spring does not involve changing the time at runtime. I need to use a more flexible option (change in runtime, multiple launch starts)

Thanks!

Spring has the @Scheduled annotation. There a several ways to configure it, one way is to configure it like unix cron job.

For example like this:

@Scheduled(cron = "0 15 10 15 * ?")
public void scheduleTaskUsingCronExpression() {
 
    long now = System.currentTimeMillis() / 1000;
    System.out.println(
      "schedule tasks using cron jobs - " + now);
}

The task here is scheduled to be executed at 10:15 AM on the 15th day of every month.

But there a also ways to configure the delay or rate dynamically at Runtime, for example like this (taken from baeldung.com):

@Configuration
@EnableScheduling
public class DynamicSchedulingConfig implements SchedulingConfigurer {

    @Autowired
    private TickService tickService;

    @Bean
    public Executor taskExecutor() {
        return Executors.newSingleThreadScheduledExecutor();
    }

    @Override
    public void configureTasks(ScheduledTaskRegistrar taskRegistrar) {
        taskRegistrar.setScheduler(taskExecutor());
        taskRegistrar.addTriggerTask(
          new Runnable() {
              @Override
              public void run() {
                  tickService.tick();
              }
          },
          new Trigger() {
              @Override
              public Date nextExecutionTime(TriggerContext context) {
                  Optional<Date> lastCompletionTime =
                    Optional.ofNullable(context.lastCompletionTime());
                  Instant nextExecutionTime =
                    lastCompletionTime.orElseGet(Date::new).toInstant()
                      .plusMillis(tickService.getDelay());
                  return Date.from(nextExecutionTime);
              }
          }
        );
    }

}

The line Instant nextExecutionTime = ... could be replaced with your own logic for setting the next execution time, like parsing the times from your array.

Take look at this baeldung tutorial about it: https://www.baeldung.com/spring-scheduled-tasks

Also take look here for the cron notation: https://www.netiq.com/documentation/cloud-manager-2-5/ncm-reference/data/bexyssf.html