Comments and Replies
Studies in this cluster, in series order. Each one keeps its own URL.
Low-level design
OOP and SOLID class design for machine-coding LLD: interfaces, invariants, in-memory state, and concurrency you can implement and test.
Comments and Replies
3 studies- 1.Comments and Replies LLD - Spec, Design Steps & ConceptsTwo-level in-memory comments/replies LLD: spec, structure choices, independent IDs, order, snapshots, concepts.
- 2.Comments and Replies - In-Memory Solution, Ordering & TestsFull CommentService Python+TS sketch with tests for order, validation, isolation, independent IDs, concurrency, snapshots.
- 3.Comments and Replies - Concurrent IDs, Snapshots & Post IsolationConcurrent ID allocation, defensive snapshots, post isolation, lock granularity decision chart, follow-ups.