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I am creating my own custom shortcut annotation, as described in Spring Documentation:
@Target({ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Transactional(value = "Custom", readOnly = true)
public @interface CustomTransactional {
}
Is it possible, that with my custom annotation I could be also able to set any other attributes, which are available in @Transactional? I would like to able use my annotation, for example, like this:
@CustomTransactional(propagation = Propagation.REQUIRED)
public class MyClass {
}
996
Annotations, just like methods or fields, can be inherited between class hierarchies. If an annotation declaration is marked with @Inherited , then a class that extends another class with this annotation can inherit it.
Annotations on methods are not inherited by default, so we need to handle this explicitly.
Annotation is defined like a ordinary Java interface, but with an '@' preceding the interface keyword (i.e., @interface ). You can declare methods inside an annotation definition (just like declaring abstract method inside an interface). These methods are called elements instead.
We can also explicitly specify the attributes in a @Test annotation. Test attributes are the test specific, and they are specified at the right next to the @Test annotation.
No, that will not work, if you want additional attributes that will have to be set on your custom annotation itself this way:
@Target({ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Transactional(value = "Custom", readOnly = true, propagation = Propagation.REQUIRED)
public @interface CustomTransactional {
}
A solution (bad one :-) ) could be to define multiple annotations with the base set of cases that you see for your scenario:
@Target({ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Transactional(value = "Custom", readOnly = true, propagation = Propagation.REQUIRED)
public @interface CustomTransactionalWithRequired {
}
@Target({ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Transactional(value = "Custom", readOnly = true, propagation = Propagation.SUPPORTED)
public @interface CustomTransactionalWithSupported {
}
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