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LLDsystem_design~12 mins

State management (idle, moving up, moving down) in LLD - Architecture Diagram

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System Overview - State management (idle, moving up, moving down)

This system manages the states of an object that can be idle, moving up, or moving down. It tracks state changes and ensures smooth transitions between these states to reflect the object's current activity accurately.

Architecture Diagram
  +---------+       +-------------+       +-------------+
  |  Input  | ----> | State       | ----> | Output      |
  | Handler |       | Manager     |       | Generator   |
  +---------+       +-------------+       +-------------+
                         |  ^
                         |  |
                   +-----+  +-----+
                   | State Store |
                   +-------------+
Components
Input Handler
service
Receives external commands or signals that trigger state changes.
State Manager
service
Processes inputs and updates the current state based on rules.
State Store
database
Stores the current state and history of state transitions.
Output Generator
service
Generates outputs or actions based on the current state.
Request Flow - 5 Hops
Input Handler → State Manager
State Manager → State Store
State Store → State Manager
State Manager → Output Generator
Output Generator → User or System
Failure Scenario
Component Fails:State Store
Impact:State updates cannot be saved, causing loss of current state and inconsistent behavior.
Mitigation:Use replication and backups for the state store to ensure availability and data durability.
Architecture Quiz - 3 Questions
Test your understanding
Which component is responsible for deciding the new state based on input?
AState Store
BState Manager
CInput Handler
DOutput Generator
Design Principle
This design separates concerns by isolating input processing, state management, state storage, and output generation. It ensures clear state transitions and reliable state persistence, which is essential for consistent behavior in systems managing dynamic states.