GraphQL With Spring WebFlux

Spring Reactive Course Series – Part 6

What you’ll learn
Learn GraphQL From Scratch & Become Super Confident With GraphQL
Expose your Microservice APIs via GraphQL for the clients to consume in a more efficient way
How to write Integration Tests for your APIs
A lots of hands on!!

Requirements
Knowledge on Spring WebFlux
Comfortable with Indian Accent

Description
This is the 6th course in the Reactive Course Series. Spring WebFlux is a reactive non-blocking web stack which scales better & provides better performance compared to traditional Spring Web MVC!
In this course, we learn GraphQL From Scratch with Spring WebFlux to build Reactive Microservices.

By the end of this course you would be comfortable with

GraphQL Query

How GraphQL works behind the scenes

Exposing APIs & Passing Arguments

Sequential vs Parallel execution of the APIs

Type System – various GraphQL types and how to create your own types

Scalars / Objects

Interface / Union – For better API design

Schema Design – How to create types for your application and expose your APIs

N + 1 Problem and Possible solutions

How To Structure GraphQL Queries

Various GraphQL Clients – How to call your GraphQL APIs

Field Alias to change the response labels

Fragments for better reuse in the GraphQL Query Document

Operation Names for better debugging

Directives @Include / @Skip / @Deprecated for conditionally executing the APIs

Advanced Concepts

Custom Data Fetcher – How to create your own data resolver for fetching the data more efficiently.

Data Fetching Selection Set – How to access various fields from the request

Operation Caching – to speed up the GraphQL engine execution by caching the parsed document.

CRUD Applications With GraphQL

Integration with Database to create a CRUD application and learn how GraphQL Mutation works.

Subscription

Let’s learn how GraphQL Subscription works for a long running stream of responses using WebFlux WebSocket.

How to emit events for the clients to consume.

Input Validation / Error Handling

How we could do input validation and communicate the error messages to the client. There are few techniques like GraphQL Error object, Using Union types etc. We will be exploring all the options.

How we could intercept the incoming requests, access HTTP headers and pass them to the GraphQL controller / APIs and take appropriate actions.

Integration Tests

How to write integration tests for your GraphQL API and do the assertion using JSON Path. This covers Query / Mutation and Subscription type APIs.

Who this course is for
Any Java / Spring Developer

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