====== SpringFramework Meta Annotation ======
  * [[:springframework|Spring Framework]] 4 버전부터 메타 어노테이션에서 alias 기능 생김

===== 예: @Transactional override =====
  * DataSource와 TransactionManager가 여러개일 때 각 트랜잭션 매니저마다 별도의 ''@Transactional''을 만들어주고 싶을 때

<code java>
@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;
...
}
</code>

===== 참조 =====
  * [[https://github.com/spring-projects/spring-framework/wiki/spring-annotation-programming-model|Spring Annotation Programming Model]]
  * [[https://www.logicbig.com/tutorials/spring-framework/spring-web-mvc/meta-annotation.html|Spring MVC- What are meta-annotations? How to create a custom annotation with meta-annotations?]]
  * [[https://www.logicbig.com/tutorials/spring-framework/spring-core/alias-for-annotation.html|@AliasFor annotation Examples]]