Add support for @Scheduled as a meta-annotation [SPR-6669]

[spring-projects-issues]

Mark Fisher opened SPR-6669 and commented

Rather than requiring the @Scheduled annotation directly on a method, we should also support it as a meta-annotation. This would not only avoid a direct dependency on the Spring annotation class, but more importantly, it would enable the use of custom scheduling annotations with encapsulated trigger information to be applied via simplified annotations.

For example, the following annotation...

@Scheduled(cron = "0 0 * * * ?")
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface Hourly {}

...could be applied to a method:

public class ReportGenerator {

    @Hourly
    public void generateReport() {
      ...
    }
}

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Affects: 3.0 GA

Referenced from: commits 1284086