1. Demand Driven Applications
with
Vinci Rufus
@areai51
GraphQL

2. 3 Eras of Web based Applications
Monolithic
Server Side
Applications
De-Coupled
Headless
Applications
REST
Demand Driven
Applications
Demand Driven

3. C O P Y R I G H T S A P I E N T R A Z O R F I S H | C O N F I D E N T I A L 3
What’s the problem with REST

4. C O P Y R I G H T S A P I E N T R A Z O R F I S H | C O N F I D E N T I A L 4
Over Fetching & Under Fetching
The Power of Positive Thinking
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Author - John Doe
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5. C O P Y R I G H T S A P I E N T R A Z O R F I S H | C O N F I D E N T I A L 5
Agree on JSON Contracts
Frontend Developer Backend Developer

6. API Documentation

7. C O P Y R I G H T S A P I E N T R A Z O R F I S H | C O N F I D E N T I A L 7
API Rigidity and Bloat

8. C O P Y R I G H T S A P I E N T R A Z O R F I S H | C O N F I D E N T I A L 8
API versioning
API - V1 API – V2 API – V3

9. Demand Driven Architecture

10. David Nolen
Kovas Boguta
WTH is Demand Driven Architecture?
• Driven from the client side app. Clients demand their data
needs.
• Server knows how to parse this demand structure
recursively, fetching all data that is needed.
• Query up. Render down,

11. FALCOR GraphQL
By
Netflix
2011
By
Facebook
2012

12. GraphQL is a query language for your API, and a
server-side runtime for executing queries by using
a type system you define for your data.

13. "The biggest mistake we made as a company was
betting too much on HTML5 instead of native... We
burnt two years.”
Tech Crunch- Disrupt (2012)

14. Evolution
2012
Internal
Development at
Facebook
2015
Open sourced
2016
Deemed
Production
Ready

15. Popular brands using Graphql

16. GraphQL Specifications
facebook.github.io/graphql

17. Server Implementations
No Language Server Libraries
1 JavaScript GraphQL.js, express-graphql, Apollo Server
2 Ruby Graphql-ruby
3 Python Graphene
4 Scala Sangria
5 Java Graphql-java
6 Clojure Graphql-clj
7 Go Lang Graphql-gp , graphql-relay-go
8 PHP Graphql-php , graphql-relay-php
9 C# / .Net Graphql-dotnet, graphql-net
10 Elixir Absinthe, graphql-elixir

18. GraphQL is NOT
! a Graph database
! a client side state management library
! Limited to React, Relay or Web
! Limited to JavaScript & Node
Not related to Facebook’s Social Graph

19. GraphQL Clients
Relay
lokka
React | Angular | iOS | Android | VanillaJS

20. REST
GraphQL
src: http://slides.com/gerardsans/ngeurope-ng2-loves-graphql#/3/5
REST
GraphQL

21. GraphQL Topology
GraphQL
PIM OMS Inventory RDBMS
Microservices
Gql Query
Gql Query

22. Authentication & Authorization
HTTP
Authentication
GraphQL
Business Logic
Authorization
REST
Data Layer
src: https://www.youtube.com/watch?v=6GyubnT38EQ

23. GraphQL Query
• Single Endpoint.
• No more crazy parsing logic for JSON data
• No Need for Versioning

24. 3 Types of Operations
•Query
Query data by passing an empty object of fields you want data for.
•Mutations
Cary out write operations on the dataset.
•Subscriptions
Real-time (read-only) updates of data.

25. GraphiQL

26. demo:
bit.ly/git-stars
code:
bit.ly/git-stars-code

27. Upcoming Features

28. @defer

29. Live Queries

30. • Vinci Rufus
• @areai51