GraphQl implementation using webflux

The spring-boot-starter-graphql is a starter dependency for Spring Boot applications that allows them to integrate with GraphQL APIs. It provides a set of tools and libraries that enable developers to easily build GraphQL-based applications and expose them through a GraphQL endpoint. The starter includes support for GraphQL queries, mutations, subscriptions, and schema definitions, as well as integration with Spring Boot's autoconfiguration and dependency injection features.

Format code

$ ./mvnw spotless:apply

Run tests

$ ./mvnw clean verify

Run locally

$ docker-compose -f docker/docker-compose.yml up -d
$ ./mvnw spring-boot:run -Dspring-boot.run.profiles=local

Using Testcontainers at Development Time

You can run TestApplication.java from your IDE directly. You can also run the application using Maven as follows:

./mvnw spring-boot:test-run

Useful Links

• Swagger UI: http://localhost:8080/swagger-ui.html

• Actuator Endpoint: http://localhost:8080/actuator

• GraphIQL: http://localhost:8080/graphiql

About Graph QL

It contains 3 concepts

• Queries - Read data from the Server

• Mutations - Update data on the Server

• Subscriptions - Read data over a period of time(Stock market updates, inflight recorder)

How to fetch data using URL

• There are two types of annotations that can be used expose API

  • @SchemaMapping(typeName = "Query", field = "customers") , Here typeName should be matching the schema declared in schema.graphqls and filed should match the definition

  • @QueryMapping , Short hand for @SchemaMapping where field if not specified will be obtained from methodname and it should be declared in schema.graphqls

Sample data

 {
    customers {
    id
    name
    orders {
        id
     }
   }
  }

or

{
    customers {
     id
    }
}

Fetching data based on name

{
    customersByName(name: "kolli") {
        id
        name
    }
}