Karl Heinz Marbaise created MNG-6056:
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Summary: Implement Feature Toggle Module to handle Feature Toggles
Key: MNG-6056
URL: https://issues.apache.org/jira/browse/MNG-6056
Project: Maven
Issue Type: Task
Affects Versions: 3.4.0
Reporter: Karl Heinz Marbaise
Assignee: Karl Heinz Marbaise
Priority: Minor
Fix For: 3.4.0
Implement a feature toggle module to handle feature toggles in Maven. The best
from my point of view at the moment is having a relationship to the JIRA which
defines all kinds of bugs, issues and of course features.
Create a separate module: {{maven-feature}} to have no other dependency which
means it can be integrated into any other module of maven.
Add appropriate command line option like {{--activate-features}} to activate
one or more features in one go. This prevents us from changing the command line
every time we add or remove a feature toggle.
So a command line option could look like this:
{code}
mvn --activate-features MNG2345,MNG1299 clean package
{code}
This will activate the features {{MNG2345}} and {{MNG1299}}. If you try to
activate a feature toggle which does not exist we should simply print out a
warning and just continue. This will simplify also future changes which means
if 3.4.0 introduces a feature toggle {{MNG-XXXX}} but in Maven 3.5.0 this
feature toggle does not exists anymore or made default calling the command line
that way will only produce a warning nothing more.
It should be compile time save which means if the feature toggle will be
removed the compiler should show where this features has been used or
questioned if it is activated. This will simplify the removal of the dependent
code.
Simplify adding of new feature toggles.
Currently the best seemed to be an enumeration which contains this information.
It should also be possible to list all available feature toggles via command
line option like {{--list-features}} which should print out the existing
feature toggles plus an appropriate description for the user (in particular
intended for maven devs).
It should also be simple to query for a feature toggle like:
{code:java}
@Requirement
private SelectedFeatures featureToggle;
...
if (featureToggle.isFeatureActive(Feature.MNG10000)) {
// The feature is implemented here or a different selection is done.
}}
{code}
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