How to conditionally enable or disable scheduled jobs in Spring?

Question

I am defining scheduled jobs with cron style patterns in Spring, using the @Scheduled annotation.

The cron pattern is stored in a config properties file

Answer 1

If you are looking to toggle @EnableScheduling from a property you can do this in Spring Boot by moving the @EnableScheduling annotation to a configuration class and use @ConditionalOnProperty as follows:

@Configuration
@EnableScheduling
@ConditionalOnProperty(prefix = "com.example.scheduling", name="enabled", havingValue="true", matchIfMissing = true)
public class SchedulingConfiguration {

}

This will disable scheduling for the application. This may be useful in a situation where you want to be able to run the application once or scheduled depending on how it's being started.

From wilkinsona's comment on here: https://github.com/spring-projects/spring-boot/issues/12682

Answer 2

Your question states to condition the actual creation of the bean. You can do this easily with this parameter by using @Profile if you are using at least Spring 3.1.

See the documentation here: http://static.springsource.org/spring/docs/3.1.x/javadoc-api/org/springframework/context/annotation/Profile.html

Answer 3

I know my answer is a hack, but giving a valid cron expression that never executes may fix the issue (in the environment specific configuration), Quartz: Cron expression that will never execute

Answer 4

You can group schedule methods by conditions into number of services and init them like this:

@Service
@ConditionalOnProperty("yourConditionPropery")
public class SchedulingService {

@Scheduled
public void task1() {...}

@Scheduled
public void task2() {...}

}

Answer 5

@Component
public class ImagesPurgeJob implements Job {

    private Logger logger = Logger.getLogger(this.getClass());

    @Value("${jobs.mediafiles.imagesPurgeJob.enable}")
    private boolean imagesPurgeJobEnable;

    @Override
    @Transactional(readOnly=true)
    @Scheduled(cron = "${jobs.mediafiles.imagesPurgeJob.schedule}")
    public void execute() {

         //Do something
        //can use DAO or other autowired beans here
        if(imagesPurgeJobEnable){

            Do your conditional job here...

        }
    }
}