Task Description

We need to be able to manage Janusgraph schema with incremental versioned updates. This should be done with help of JanusGraphManagement which provide Java API to manage schema. We already have a org.carlspring.strongbox.janusgraph.graph.schema.StrongboxSchema class that creates initial schema and within this task we should make it work using step-by-step change-sets. The change-sets will be stored as a constant list of StrongboxSchema class.

Tasks

The following tasks will need to be carried out:

• Implement an interface which will represent single change-set, it should have the apply(JanusGraphManagement jgm) method and following attributes:
  • name (some meanable change-set name)
  • version (Semantic Versioning format)
• Add DatabaseSchema vertex type which will represent current schema
• Add ChangeSet vertex type which will represent applied change-sets
• Add DatabaseSchema#ChangeSet edge type which will represent one-to-many relation between DatabaseSchema and ChangeSet (it should also have the applyDate property)
• Implement the logic which will create DatabaseSchema vertex if it not exists
• Implement the logic which will apply change-sets delta from current DatabaseSchema version.
• implement StrongboxSchema.dropSchema method for test purpose which will be executed on Spring Application context shutdown.

Task Relationships

This task:

• Is a sub-task of: Create a proof-of-concept using Janusgraph and Cassandra #1573

Useful Links

• Schema and Data Modeling

Help

• Our chat
• Points of contact:
  • @carlspring
  • @fuss86
  • @sbespalov
  • @steve-todorov