[jira] [Resolved] (ISIS-1213) Provide support for @Mixin domain objects, as a specialized type of contributor (though not a domain service)

["Dan Haywood (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ISIS-1213?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dan Haywood resolved ISIS-1213.
-------------------------------
    Resolution: Fixed

> Provide support for @Mixin domain objects, as a specialized type of contributor (though not a domain service)
> -------------------------------------------------------------------------------------------------------------
>
>                 Key: ISIS-1213
>                 URL: https://issues.apache.org/jira/browse/ISIS-1213
>             Project: Isis
>          Issue Type: New Feature
>          Components: Core
>    Affects Versions: 1.9.0
>            Reporter: Dan Haywood
>            Assignee: Dan Haywood
>            Priority: Minor
>             Fix For: 1.10.0
>
>
> For example, rather than a contributed action:
> {code:java}
> @DomainService(
>         nature = NatureOfService.VIEW_CONTRIBUTIONS_ONLY
> )
> public class CommunicationChannel_updateNotes {
>     @Action(
>             semantics = SemanticsOf.IDEMPOTENT
>     )
>     public <T extends CommunicationChannel<T>> CommunicationChannel<T> updateNotes(
>             CommunicationChannel<T> communicationChannel,
>             @Parameter(optionality = Optionality.OPTIONAL)
>             @ParameterLayout(named = "Notes", multiLine = 10)
>             final String Notes) {
>         communicationChannel.setNotes(Notes);
>         return communicationChannel;
>     }
>     public <T extends CommunicationChannel<T>> String default1UpdateNotes(
>             CommunicationChannel<T> communicationChannel
>             ) {
>         return communicationChannel.getNotes();
>     }
> }
> {code}
> which requires passing in the contributee to every method, and ensuring that all methods are named correctly, we can instead say:
> {code:java}
> @DomainObject(
>         nature = Nature.MIXIN
> )
> public class CommunicationChannel_updateNotes {
>     private final CommunicationChannel communicationChannel;
>     public CommunicationChannel_updateNotes(CommunicationChannel communicationChannel) {
>         this.communicationChannel = communicationChannel;
>     }
>    @Action(
>             domainEvent = UpdateNotesEvent.class,
>             semantics = SemanticsOf.IDEMPOTENT
>     )
>     public <T extends CommunicationChannel<T>> CommunicationChannel<T> __(
>             @Parameter(optionality = Optionality.OPTIONAL)
>             @ParameterLayout(named = "Notes", multiLine = 10)
>             final String Notes) {
>         communicationChannel.setNotes(Notes);
>         return communicationChannel;
>     }
>     public <T extends CommunicationChannel<T>> String default0__() {
>         return communicationChannel.getNotes();
>     }
> }
> {code}
> where the name of the action is "_" meaning instead infer the action name from the name of the mixin class, and where the mixin has a constructor of the object being mixed in.



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