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From "Carsten Ziegeler (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SLING-8058) Make configuration of slingfeature-maven-plugin consistent
Date Mon, 29 Oct 2018 08:11:00 GMT
Carsten Ziegeler created SLING-8058:
---------------------------------------

             Summary: Make configuration of slingfeature-maven-plugin consistent
                 Key: SLING-8058
                 URL: https://issues.apache.org/jira/browse/SLING-8058
             Project: Sling
          Issue Type: Improvement
          Components: Maven Plugins and Archetypes
            Reporter: Carsten Ziegeler
             Fix For: slingfeature-maven-plugin 1.0.0


The slingfeature-maven-plugin as 2 goals: aggregate-features and repository that both have
slightly different ways of selecting included features. Then it's also possibly to select
via includes at the top level configuration of the feature.

The top-level includes specifies the initial set of feature files used, the other goals can
then refine this subset.

We should make these consistent.

They should have the same way to:
1. include/exclude feature files from the total set
2. refer to a feature file in a maven repository
3. refer to an aggregated feature done in the same pom, e.g. by just referring to its classifier,
e.g. <aggregateClassifier>

The code that handles this should probably be shared in the ProjectHelper and it might make
sense to create a new shared parent base class, e.g. AbstractIncludingFeatureMojo extends
AbstractFeatureMojo to hold the fields or something like this.

The way it works is:
* The plugin is configured with a directory (features parameter), includes and excludes for
that directory (featuresIncludes, featuresExcludes parameters) - all of these are defined
in the AbstractFeatureMojo
* There is a similar set for testing features in the AbstractFeatureMojo
* The DependencyLifecycleParticipant for the plugin triggers the Preprocessor which uses all
of the above information to create the set of available features for this project, let's call
it the global set of features 
* The global set of features is the set of features every mojo should use. The mojo gets them
through the ProjectHelper
* The above mechanism should stay as is and as the Preprocessor is the only one reading the
above mentioned parameters, they are private and not to be used by any mojo directly
* The aggregate and the repository mojo (and potentially more mojos in the future) use the
above created global set of features and *further* filter it using includes and excludes.
These are additional includes/excludes that only work on this global set, therefore they should
not be part of the AbstractFeatureMojo
* All these mojos (aggregate and repository) should use the same configuration and work similar
with selecting features
* It makes sense to create a new abstract class to unify this selection, this abstract class
would inherit from AbstractFeatureMojo, add the additional includes/excludes handling and
be used by the mojos like the aggregate and the repository mojo

I suggest we use the following general configuration format.
For includes, excludes of files from the current projects
{noformat}
  <featureFiles>
       <include>base.json</include>
       <include>something/*.json</include>
       <exclude>something/badfile.json</exclude>
  </featureFiles>
{noformat}
For features from external projects
{noformat}
  <featureArtifact>
        </groupId></artifactId>etc.
  </featureArtifact>
{noformat}
For aggregates from the same project
{noformat}
  <aggregateFeature>CLASSIFIER_NAME</aggregateFeature>
{noformat}

The configuration for the aggregate mojo is then:
{noformat}
<aggregate>
  <featureFiles/>*
  <featureArtifact>*
  <aggregateFeature>*
</aggregate>
{noformat}

The configuration for the repository mojo becomes similarly:
{noformat}
<repository>
  <featureFiles/>*
  <featureArtifact>*
  <aggregateFeature>*
  <artifact>*
</repository>
{noformat}
Note that the repository mojo gets an additional configuration for artifacts to be added to
the repository, these are not features
I suggest we use the following general configuration format.
For includes, excludes of files from the current projects
{noformat}
  <featureFiles>
       <include>base.json</include>
       <include>something/*.json</include>
       <exclude>something/badfile.json</exclude>
  </featureFiles>
{noformat}
For features from external projects
{noformat}
  <featureArtifact>
        </groupId></artifactId>etc.
  </featureArtifact>
{noformat}
For aggregates from the same project
{noformat}
  <aggregateFeature>CLASSIFIER_NAME</aggregateFeature>
{noformat}

The configuration for the aggregate mojo is then:
{noformat}
<aggregate>
  <featureFiles/>*
  <featureArtifact>*
  <aggregateFeature>*
</aggregate>
{noformat}

The configuration for the repository mojo becomes similarly:
{noformat}
<repository>
  <featureFiles/>*
  <featureArtifact>*
  <aggregateFeature>*
  <artifact>*
</repository>
{noformat}
Note that the repository mojo gets an additional configuration for artifacts to be added to
the repository, these are not features



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