[TINKERPOP-2261] Adding transactions to Tinkergraph for better testability

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Won't Do
• Affects Version/s: 3.3.7, 3.4.2
• Component/s: tinkergraph
• Assignee: Unassigned
• Reporter: Divij Vaidya
• Created: 10/Jul/19 20:25
• Updated: 07/Aug/19 15:28
• Resolved: 07/Aug/19 15:28

Description

Tinkergraph should act as a datastore which supports transactions. This would help define tx semantics for Gremlin and add test suites that fail when those semantics are violated. 

As an example, https://issues.apache.org/jira/projects/TINKERPOP/issues/TINKERPOP-2257 bug would have been caught by the test suite if the tinkergraph was mimicking transaction support.

Hence, this task breaks down into:
1. Mimic transaction support in TinkerGraph
2. Add tests that validate the transaction semantics (e.g. accessing the iterator after the transaction is closed will cause an error)