This document discusses using an API gateway (BFF) to aggregate API services and solve issues with communication between microservices. It provides definitions of software engineering and quality attributes. It then asks if there is a way to solve the "mess" of communication between services using concepts like the CAP theorem. Finally, it discusses how to implement an API gateway in .NET Core using Ocelot to compose microservices and provide a single entry point.

1. Aggregating API Services with an
API Gateway (BFF)

2. José Roberto Araújo

3. Open for subscriptions
.NET Software Architect: Domain and Services
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www.sympla.com.br/emerging-code

4. “
Software Engineering
“The systematic application of scientific and technological
knowledge, methods and experience to the design,
implementation, testing and documentation of software” –
The Bureau of Labor Statistics – IEEE
“The application of a systematic, disciplined, quantifiable
approach to the development, operation and maintenance of
software” – IEEE Standard Glossary of Software
Engineering Terminology
“An engineering discipline that is concerned with all aspects of
software production” – Ian Sommerville
https://en.wikipedia.org/wiki/Software_engineering

5. Quality Attributes
ISO 25000

6. CAP Theorem

7. Chaos on communications
between services

8. CHAOS in Composite UI and
service communication

9. So... Is there one way which allows
me to solve this mess?

10. First of all, let's understand some
important concepts and the
differences between them !!!

14. Microservice Compositor
http://microservicepatterns.org/design_patterns/microservice_compositor

15. Can we do that using
.NET Core?

16. YES! We can and We do!
Let’s see how!?

18. Api Gateway (BFF)
Microservice Compositor

19. https://github.com/jr-araujo/ApiGatewayWithOcelot

20. Thank You
You’re able to find me in social media channles below:
@jrobertofaraujo
joserobertoaraujo
in/joserobertoaraujo
Jr-araujo
José Roberto Araújo

21. References
• https://en.wikipedia.org/wiki/API_management
• http://microservicepatterns.org/overview
• https://ocelot.readthedocs.io/en/latest
• https://emergingcode.com.br
• http://iso25000.com/index.php/en
• https://medium.com/@jrobertoaraujo