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If the Snake and Ladder game is extended to support multiple concurrent games running in parallel, which design consideration is most critical to avoid shared state bugs?

hard🎤 Interviewer Follow-up Q15 of Q15
OOP & Design Patterns - Design Snake and Ladder Game - LLD End-to-End
If the Snake and Ladder game is extended to support multiple concurrent games running in parallel, which design consideration is most critical to avoid shared state bugs?
AEnsuring each game instance has its own independent GameController and Player objects
BCentralizing player positions in a global data structure accessible by all games
CSharing the Dice instance across games to reduce resource usage
DUsing a singleton pattern for the Board class to ensure consistency across games
Step-by-Step Solution

  1. Step 1: Singleton Board pattern

    Incorrect: Singleton would cause shared state across games, leading to conflicts.

  2. Step 2: Independent GameController and Player per game

    Correct: Isolates state per game, preventing interference.

  3. Step 3: Sharing Dice instance

    Incorrect: Shared Dice can cause race conditions or inconsistent rolls.

  4. Step 4: Global player positions

    Incorrect: Global state breaks isolation and causes bugs.

  5. Final Answer:

    Option A -> Option A

  6. Quick Check:

    Isolating state per game instance is key for concurrency safety.
Quick Trick: Isolate state per game instance to avoid concurrency bugs [OK]
Common Mistakes:
MISTAKES
  • Using singleton for shared components without considering concurrency
  • Sharing mutable objects like Dice across threads
  • Centralizing state globally ignoring isolation
Trap Explanation:
PITFALL
  • Candidates often choose singletons or shared objects to save resources, ignoring concurrency issues.
Interviewer Note:
CONTEXT
  • Tests advanced understanding of state isolation and concurrency in OOP design.
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