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Scheduling a job with Spring programmatically (with fixedRate set dynamically)- Stack Overflow

Java PingBook 1 months ago (10-23) 17 0

Question

Currently I have this :

@Scheduled(fixedRate=5000)
public void getSchedule(){
System.out.println(“in scheduled job”);
}

I could change this to use a reference to a property

@Scheduled(fixedRate=${myRate})
public void getSchedule(){
System.out.println(“in scheduled job”);
}

However I need to use a value obtained programmatically so the schedule can be changed without redeploying the app. What is the best way? I realize using annotations may not be possible…

Answer

Using a Trigger you can calculate the next execution time on the fly.

Something like this should do the trick (adapted from the Javadoc for @EnableScheduling):

@Configuration
@EnableScheduling
public class MyAppConfig implements SchedulingConfigurer {

@Autowired
Environment env;

@Bean
public MyBean myBean() {
return new MyBean();
}

@Bean(destroyMethod = “shutdown”)
public Executor taskExecutor() {
return Executors.newScheduledThreadPool(100);
}

@Override
public void configureTasks(ScheduledTaskRegistrar taskRegistrar) {
taskRegistrar.setScheduler(taskExecutor());
taskRegistrar.addTriggerTask(
new Runnable() {
@Override public void run() {
myBean().getSchedule();
}
},
new Trigger() {
@Override public Date nextExecutionTime(TriggerContext triggerContext) {
Calendar nextExecutionTime = new GregorianCalendar();
Date lastActualExecutionTime = triggerContext.lastActualExecutionTime();
nextExecutionTime.setTime(lastActualExecutionTime != null ? lastActualExecutionTime : new Date());
nextExecutionTime.add(Calendar.MILLISECOND, env.getProperty(“myRate”, Integer.class)); //you can get the value from wherever you want
return nextExecutionTime.getTime();
}
}
);
}
}




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