CODEWITHSUNDEEP
spring-bootscheduled-tasksspring-bean
sabu
sabu

Reputation: 2057

Make bean only if @EnableScheduling is present

I am working on scheduling library. I am using @EnableScheduling to enable and run schedulers in Spring boot. There are many beans/components that I need in my scheduler. But I want to create the beans only if @EnableScheduling is present in the application. How can I achieve that?

Upvotes: 0

Views: 438

Answers (1)

Dimitri Mestdagh
Dimitri Mestdagh

Reputation: 44665

If you take a look at what @EnableScheduling does, you'll see that it imports the SchedulingConfiguration configuration. Within this configuration class, a single bean is defined, called ScheduledAnnotationBeanPostProcessor.

This means that if you use conditionals to check for the existence of the ScheduledAnnotationBeanPostProcessor bean, you can define beans that are only created when @EnableScheduling is present.

For this purpose, we can use the @ConditionalOnBean annotation. For example:

@Bean
@ConditionalOnBean(ScheduledAnnotationBeanPostProcessor.class)
public CommandLineRunner appRunner() {
    return args -> logger.info("Scheduling is enabled!");
}

Upvotes: 2

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