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Aggregator Design Pattern in Microservices — A Complete Guide
In a microservices architecture, individual services handle specific business functionalities. However, modern applications often require data from multiple services to be aggregated into a single response. The Aggregator Design Pattern provides a structured approach to achieving this, ensuring efficiency, performance, and better client experience.
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This guide covers:
- What is the Aggregator Pattern?
- How it relates to API Gateway
- Benefits and challenges
- Implementation strategies
- A real-world e-commerce example (with database integration)
- Step-by-step implementation using Spring Boot
1️⃣ What is the Aggregator Design Pattern?
✅ Definition
The Aggregator Pattern is a microservices design pattern where a service collects responses from multiple independent microservices and merges them into a unified response for the client.
📌 Key Concept:
- A client makes a single request.
- The Aggregator Service fetches required data from multiple microservices.
- It processes and merges responses.
- The client receives a combined response instead of calling each service separately.
2️⃣ Aggregator Design Pattern vs API Gateway
✅ Key Differences
✅ When to Use Which?
- Use Aggregator Pattern when the client needs data from multiple microservices in a single response.
- Use API Gateway when managing authentication, security, and routing requests.
- Both can be used together — an API Gateway can route traffic to an Aggregator Service, which then retrieves and merges…
