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---
layout: pattern
title: Aggregator Microservices
folder: aggregator-microservices
permalink: /patterns/aggregator-microservices/
categories: Architectural
tags:
- Java
- Spring
---
## Intent
The user makes a single call to the Aggregator, and the aggregator then calls each relevant microservice and collects
the data, apply business logic to it, and further publish is as a REST Endpoint.
More variations of the aggregator are:
- Proxy Microservice Design Pattern: A different microservice is called upon the business need.
- Chained Microservice Design Pattern: In this case each microservice is dependent/ chained to a series
of other microservices.
## Class diagram
![alt text](./etc/aggregator-microservice.png "Aggregator Microservice")
## Applicability
Use the Aggregator Microservices pattern when you need a unified API for various microservices, regardless the client device.
## Credits
* [Microservice Design Patterns](http://blog.arungupta.me/microservice-design-patterns/)