SpringFramework Meta Annotation

• Spring Framework 4 버전부터 메타 어노테이션에서 alias 기능 생김

• DataSource와 TransactionManager가 여러개일 때 각 트랜잭션 매니저마다 별도의 @Transactional을 만들어주고 싶을 때

@Target({ElementType.TYPE, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Transactional("myDbTransactionManager")
public @interface MyDbTransactional {
 
    @AliasFor(annotation = Transactional.class)
    Propagation propagation() default Propagation.REQUIRED;
 
    @AliasFor(annotation = Transactional.class)
    Isolation isolation() default Isolation.DEFAULT;
 
    @AliasFor(annotation = Transactional.class)
    int timeout() default -1;
 
    @AliasFor(annotation = Transactional.class)
    boolean readOnly() default false;
...
}

• Spring Annotation Programming Model
• Spring MVC- What are meta-annotations? How to create a custom annotation with meta-annotations?
• @AliasFor annotation Examples