[SLING-8631] Introduce state for extensions

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: Feature Model 1.1.0, Feature Model IO 1.1.0
• Component/s: Feature Model
• Assignee: Carsten Ziegeler
• Reporter: Carsten Ziegeler
• Created: 15/Aug/19 05:03
• Updated: 13/Feb/20 08:53
• Resolved: 15/Aug/19 08:06

Description

Currently an extension is either required or optional. However, the extensions of the feature model also allow to keep transient state like a cache of calculations. For example, the result of scanning a feature could be attached to a feature model to avoid rescanning of downstream users.
Therefore we should probably add a method to get the state of an extension with the values TRANSIENT,OPTIONAL,REQUIRED