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

Please see my answer in another question. I think this is the best way to solve it. How to stop a scheduled task that was started using @Scheduled annotation?

Define a custom annotation like below.

@Documented
@Retention (RUNTIME)
@Target(ElementType.TYPE)
public @interface ScheduledSwitch {
    // do nothing
}

Define a class implements org.springframework.scheduling.annotation.ScheduledAnnotationBeanPostProcessor.

public class ScheduledAnnotationBeanPostProcessorCustom 
    extends ScheduledAnnotationBeanPostProcessor {

    @Value(value = "${prevent.scheduled.tasks:false}")
    private boolean preventScheduledTasks;

    private Map beans = new HashMap<>();

    private final ReentrantLock lock = new ReentrantLock(true);

    @Override
    public Object postProcessAfterInitialization(Object bean, String beanName) {
        ScheduledSwitch switch = AopProxyUtils.ultimateTargetClass(bean)
            .getAnnotation(ScheduledSwitch.class);
        if (null != switch) {
            beans.put(bean, beanName);
            if (preventScheduledTasks) {
                return bean;
            }
        }
        return super.postProcessAfterInitialization(bean, beanName);
    }

    public void stop() {
        lock.lock();
        try {
            for (Map.Entry entry : beans.entrySet()) {
                postProcessBeforeDestruction(entry.getKey(), entry.getValue());
            }
        } finally {
            lock.unlock();
        }
    }

    public void start() {
        lock.lock();
        try {
            for (Map.Entry entry : beans.entrySet()) {
                if (!requiresDestruction(entry.getKey())) {
                    super.postProcessAfterInitialization(
                        entry.getKey(), entry.getValue());
                }
            }
        } finally {
            lock.unlock();
        }
    }

}

Replace ScheduledAnnotationBeanPostProcessor bean by the custom bean in configuration.

@Configuration
public class ScheduledConfig {

    @Bean(name = TaskManagementConfigUtils.SCHEDULED_ANNOTATION_PROCESSOR_BEAN_NAME)
    @Role(BeanDefinition.ROLE_INFRASTRUCTURE)
    public ScheduledAnnotationBeanPostProcessor scheduledAnnotationBeanPostProcessor() {
        return new ScheduledAnnotationBeanPostProcessorCustom();
    }

}

Add @ScheduledSwitch annotation to the beans that you want to prevent or stop @Scheduled tasks.