This project helps you build Java Spring applications aimed at consuming elastic data APIS using GraphQL queries and mutations served using Spring RestTemplate. This application leverages American Express Nodes library while creating request for GraphQL. The request is then wrapped inside a Java String and will be passed over to server using Spring RestTemplate.
This is the client side in the seris of GraphQL Client-Server architecture aimed at enabling GraphQL with Java and SpringBoot applications.
GraphQL Java SpringBoot American Express Nodes
The GraphQL server which is responsible for producing the GraphQL APIs is covered in https://github.com/sdbawa/elastic-data-service-server
You’ll build a simple web application with Spring Boot and add some useful services to it.
GraphQL is query language for APIs. To read more please got to: https://graphql.org/
Here you create an Application class with the components:
com/sbawa/client/api/elastic/Application.java
com/sbawa/client/api/elastic/model/MutationPersonName
This class build a request object to operate on mutation and leverages the Nodes library. The mutations needs to be maped as one-to-one with request objects.
Likewise, we have another mutation mapped with following class
com/sbawa/client/api/elastic/model/MutationPersonNameAge
com/sbawa/client/api/elastic/model/QueryPersonById
This class build a request object to operate on query and leverages the Nodes library. Likewise mutations, querries also needs to be maped as one-to-one with request objects.
com/sbawa/client/api/elastic/client/GraphQLClient
Here you will build GraphQLRequestEntity from the Query or Mutation and then wrap it in a String before making call to GraphQL endpoint using RestTeamplate.
The return is always a Map<String, Object>, and this also creates the respective domain object before returning to caller.
It leverages Nodes library to create GraphQLRequestEntity for each request object.
If you are using Maven, execute:
java -jar target/graphql-java-client-0.1.0.jar
$ curl localhost:8081 The server runs at port 8081 This port can be configured from server.port in application.properties
Invoke the endpoint (https://localhost:8081/query) and you should see response. This endpoint triggers the end to flow between client and server. Make sure your GraphQL server application is running.