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.