[cdi-dev] [JBoss JIRA] (CDI-490) Clarify what happens when an interceptor/decorator is enabled using both @Priority and beans.xml

[Martin Kouba (JIRA)]

    [ https://issues.jboss.org/browse/CDI-490?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13306436#comment-13306436 ] 

Martin Kouba commented on CDI-490:
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[~meetoblivion] Yes, that's a good idea. My original point was that an app may behave differently depending on the target CDI runtime, i.e. an interceptor with {{@Priority}} might be also used in CDI 1.0 (the priority would be just ignored). But it's probably a very rare use case.

> Clarify what happens when an interceptor/decorator is enabled using both @Priority and beans.xml
> ------------------------------------------------------------------------------------------------
>
>                 Key: CDI-490
>                 URL: https://issues.jboss.org/browse/CDI-490
>             Project: CDI Specification Issues
>          Issue Type: Clarification
>          Components: Decorators, Interceptors
>    Affects Versions: 1.2.Final
>            Reporter: Jozef Hartinger
>            Assignee: John Ament
>              Labels: F2F2016
>             Fix For: 2.0 .Final
>
>
> Suppose an InterceptorA has @Priority and is also listed in the beans.xml file of a particular BDA. Such interceptor is for sure enabled because:
> {quote}An interceptor is said to be enabled if it is enabled in at least one bean archive or is listed in the final
> list of interceptors for the application, as defined in Section 11.5.2, “AfterTypeDiscovery event”.{quote}
> it matches both parts of the statement.
> As for ordering, the following statement defines invocation order:
> {quote}Interceptors enabled using @Priority are called before interceptors enabled using beans.xml.{quote}
> Since InterceptorA is enabled by both @Priority and beans.xml, the following applies:
> "Interceptors enabled using @Priority" = \{ InterceptorA \}
> "interceptors enabled using beans.xml" = \{ InterceptorA \}
> We can perform substitution in the statement and we get:
> *\{ InterceptorA \} are called before \{ InterceptorA \}*
> which does not seem right.
> The specification should explicitly address this scenario. There are several options (some of them are better, some are worse):
> 1) Invoke the interceptor twice - each time in the corresponding order given by priority and position in beans.xml
> 2) Invoke the interceptor once in the @Priority part of the invocation chain (@Priority has precedence)
> 3) Invoke the interceptor once in the beans.xml part of the invocation chain (beans.xml has precedence)
> 4) Forbid an interceptor to be enabled by both @Priority and beans.xml



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