In a system managing states idle, moving_up, and moving_down, how can you combine state management with event logging to track all state changes efficiently?
hard📝 Trade-off Q9 of Q15
LLD - Design — Elevator System
In a system managing states idle, moving_up, and moving_down, how can you combine state management with event logging to track all state changes efficiently?
ALog only errors and ignore normal state changes
BImplement a state change handler that logs every transition before updating state
CLog state changes after updating state without handler
DUse separate logging system unrelated to state changes
Step-by-Step Solution
Solution:
Step 1: Understand importance of logging state changes
Logging every transition helps debugging and monitoring system behavior.
Step 2: Best practice for logging
Using a handler that logs before state update ensures accurate capture of old and new states.
Final Answer:
Implement a state change handler that logs every transition before updating state -> Option B
Quick Check:
Log transitions via handler before state update [OK]
Quick Trick:Log state changes before updating state for accuracy [OK]
Common Mistakes:
MISTAKES
Logging only errors
Logging after state update losing old state
Ignoring logging integration
Master "Design — Elevator System" in LLD
9 interactive learning modes - each teaches the same concept differently
