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LLDsystem_design~12 mins

Why behavioral patterns define object interaction in LLD - Architecture Impact

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System Overview - Why behavioral patterns define object interaction

Behavioral patterns help objects in a system work together smoothly. They define how objects communicate and collaborate to complete tasks, making the system easier to understand and change.

Architecture Diagram
User
  |
  v
Client Object
  |
  v
Behavioral Pattern (Mediator)
  /      |       \
 /       |        \
Service A  Service B  Service C
  |          |          |
  v          v          v
Database   Cache     Logger
Components
User
actor
Initiates requests to the system
Client Object
object
Sends requests and receives responses
Behavioral Pattern (Mediator)
behavioral_pattern
Coordinates communication between services to reduce direct dependencies
Service A
service
Handles specific business logic part A
Service B
service
Handles specific business logic part B
Service C
service
Handles specific business logic part C
Database
database
Stores persistent data
Cache
cache
Stores frequently accessed data for quick retrieval
Logger
service
Records system events and errors
Request Flow - 10 Hops
User → Client Object
Client Object → Behavioral Pattern (Mediator)
Behavioral Pattern (Mediator) → Service A
Service A → Cache
Cache → Service A
Service A → Database
Database → Service A
Service A → Behavioral Pattern (Mediator)
Behavioral Pattern (Mediator) → Client Object
Client Object → User
Failure Scenario
Component Fails:Behavioral Pattern (Mediator)
Impact:Communication between services breaks, causing request failures and no coordination
Mitigation:Implement fallback direct communication or redundant mediator instances for high availability
Architecture Quiz - 3 Questions
Test your understanding
What role does the Behavioral Pattern (Mediator) play in this system?
AIt coordinates communication between services
BIt directly stores user data
CIt caches frequently used data
DIt handles user authentication
Design Principle
Behavioral patterns like the Mediator define clear communication paths between objects. This reduces direct dependencies, making the system easier to maintain and extend by controlling how objects interact.