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

We can disable the bean creation of the class having that scheduled methods using @Conditional annotation. This is very similar to @ConditionalOnProperty. This is used to conditionally spin up a bean on to the spring context. If we set the value to false, then the bean will not be spun up and loaded to spring. Below is the code.

application.properties:

com.boot.enable.scheduling=enable

Condition:

public class ConditionalBeans implements Condition {
    @Override
    public boolean matches(ConditionContext context, AnnotatedTypeMetadata metadata) {
        return "enabled".equalsIgnoreCase(context.getEnvironment().getProperty("com.boot.enable.scheduling"));
    }
}

My schedule class

@Service
@Conditional(ConditionalSchedules.class)
public class PrintPeriodicallyService {

    @Scheduled(fixedRate = 3000)
    public void runEvery3Seconds() {
        System.out.println("Current time : " + new Date().getTime());
    }
}

This approach has a lot of flexibility where the condition generation is totally under our control.