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From "Robert Scholte (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MPLUGIN-350) Split @Parameter into @Input and @Output
Date Thu, 02 May 2019 16:57:00 GMT

    [ https://issues.apache.org/jira/browse/MPLUGIN-350?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16831762#comment-16831762
] 

Robert Scholte commented on MPLUGIN-350:
----------------------------------------

for example: maven-compiler-plugins outputDirectory (target/classes) is the input of maven-jar-plugin.
By being explicit about the input and output we can do smart things at Maven level. In this
case it means that maven-jar-plugin must always be executed after maven-compiler-plugin.
Only if all inputs of a plugin have been processed as output of other plugins, this plugin
can be executed.

> Split @Parameter into @Input and @Output
> ----------------------------------------
>
>                 Key: MPLUGIN-350
>                 URL: https://issues.apache.org/jira/browse/MPLUGIN-350
>             Project: Maven Plugin Tools
>          Issue Type: New Feature
>            Reporter: Robert Scholte
>            Priority: Major
>
> By knowing if parameters are input or output parameters, it is possible to improve our
builds. It will be possible to create DAGs and chain the execution blocks much smarter.
> The Maven Extension created by Gradle heavily relies on this kind of information.
> It is probably easier to use new annotations instead of adding a (required) status-field
to @Parameter
> Looking at the {{plugin.xml}} it looks quite easy to solve this and stay backwards compatible:
the file looks now like:
> {code:xml}
>   <parameters>
>     <parameter>
>       ...
>     </parameter>
>   </parameters>
> {code}
> With plexus-magic the following should still work:
> {code:xml}
>   <parameters>
>     <input>
>       ...
>     </input>
>     <output>
>       ...
>     </output>
>   </parameters>
> {code}



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