[cdi-dev] [JBoss JIRA] (CDI-631) Improve AnnotationLiteral for empty annotations

Martin Kouba (JIRA) issues at jboss.org
Tue Oct 25 09:23:02 EDT 2016

    [ https://issues.jboss.org/browse/CDI-631?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13311518#comment-13311518 ] 

Martin Kouba commented on CDI-631:

For the record - {{AnnotationLiteral#hashCode()}} is already optimized for annotations with no members (see also https://github.com/cdi-spec/cdi/blob/master/api/src/main/java/javax/enterprise/util/AnnotationLiteral.java#L66), the same applies to {{#equals()}}.  {{#toString()}} is not cached and I don't think it should be (by the way it's not even cached in the referenced OWB's {{EmptyAnnotationLiteral}}).

Also I don't think we should cache hashCode and toString for annotations with members - it could work in most cases but it's not 100%.

> Improve AnnotationLiteral for empty annotations
> -----------------------------------------------
>                 Key: CDI-631
>                 URL: https://issues.jboss.org/browse/CDI-631
>             Project: CDI Specification Issues
>          Issue Type: Feature Request
>            Reporter: Mark Struberg
>             Fix For: 2.0 (discussion)
> Annotation hashCode() and equals() operations are fairly expensive as they always invoke getDeclaredMethods() even if there are no such. And getDeclaredMethods involves the SecurityManager + wrapper classes + Exception handling + + + 
> That's horrible expensive.
> In OWB I improved this by introducing an own base class for dynamic annotations which do not have any members:
> https://github.com/apache/openwebbeans/blob/trunk/webbeans-impl/src/main/java/org/apache/webbeans/annotation/EmptyAnnotationLiteral.java
> The method returns a hardcoded String for toString(), returns hardcoded 0 as hashCode and the equals() method invokes the equals on the annotation type.
> We might support this improvements directly in the AnnotationLiteral class or introduce a similar 2nd class especially for empty annotations?

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