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Microservicessystem_design~12 mins

Anti-corruption layer in Microservices - Architecture Diagram

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System Overview - Anti-corruption layer

An Anti-corruption Layer (ACL) is a design pattern used in microservices to protect a service from changes or complexity in another service's model. It acts as a translator or adapter, ensuring that the internal system remains clean and consistent while interacting with external or legacy systems.

Key requirements include isolating the internal domain model, translating data formats, and preventing direct dependency on external service models.

Architecture Diagram
User
  |
  v
Load Balancer
  |
  v
API Gateway
  |
  v
Internal Service <---> Anti-Corruption Layer <---> External Service
                             |
                             v
                        External Database
Components
User
client
Initiates requests to the system
Load Balancer
load_balancer
Distributes incoming requests evenly to API Gateway instances
API Gateway
api_gateway
Handles client requests, routing them to internal services
Internal Service
service
Core business logic service with its own clean domain model
Anti-Corruption Layer
adapter_service
Translates and adapts data and commands between internal service and external service
External Service
external_service
Legacy or third-party service with a different domain model
External Database
database
Data storage used by the external service
Request Flow - 12 Hops
User → Load Balancer
Load Balancer → API Gateway
API Gateway → Internal Service
Internal Service → Anti-Corruption Layer
Anti-Corruption Layer → External Service
External Service → External Database
External Database → External Service
External Service → Anti-Corruption Layer
Anti-Corruption Layer → Internal Service
Internal Service → API Gateway
API Gateway → Load Balancer
Load Balancer → User
Failure Scenario
Component Fails:Anti-Corruption Layer
Impact:Internal service cannot communicate with external service, causing failures or stale data for features relying on external data.
Mitigation:Implement fallback mechanisms such as cached data or default responses; monitor ACL health and use circuit breakers to prevent cascading failures.
Architecture Quiz - 3 Questions
Test your understanding
What is the main purpose of the Anti-Corruption Layer in this architecture?
ATo balance load between API Gateway instances
BTo translate and adapt data between internal and external services
CTo store user session data
DTo directly expose the external database to users
Design Principle
The Anti-Corruption Layer pattern helps maintain a clean and stable internal domain model by isolating it from external systems with different models. This reduces complexity and dependency risks, enabling easier maintenance and evolution of the internal service.