In-memory implementation of the SessionStore behaviour.

This adapter stores all session data in memory using a GenServer with ETS tables for efficient concurrent reads. It is designed primarily for testing and development environments.

Design

• Uses ETS tables for concurrent read access
• GenServer handles writes to ensure consistency
• Events are stored in an append-only log with preserved order
• All writes are idempotent (same ID updates, doesn't duplicate)
• Thread-safe for concurrent access

Data Structures

• Sessions: ETS table keyed by session_id
• Runs: ETS table keyed by run_id with session_id index
• Events: Append-only list stored in GenServer state (maintains order)
  • Also indexed in ETS by event_id for deduplication

Usage

{:ok, store} = InMemorySessionStore.start_link([])

# Use via SessionStore port
SessionStore.save_session(store, session)
{:ok, session} = SessionStore.get_session(store, session_id)

Options

• :name - Optional name for the GenServer (default: none)