Скачать или смотреть Building a GraphQL Application with Websocket Support in Spring Boot

Learn how to configure a Spring Boot application using GraphQL and Websockets for advanced real-time features. This guide walks you through the necessary steps and code implementation!
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Building a GraphQL Application with Websocket Support in Spring Boot

In recent years, Websockets have become an integral technology for creating real-time applications. When combined with GraphQL, they provide a powerful way to handle dynamic data in a performant way. In this guide, we focus on a common challenge developers face: implementing Queries and Mutations over Websockets in a Spring Boot application leveraging GraphQL.

The Problem

You're developing a GraphQL application using Spring Boot and have successfully implemented HTTP requests for Queries and Mutations. You also enjoy the real-time data capabilities through Subcriptions over Websockets. However, you find yourself needing to route Queries and Mutations over the same websocket connection. This becomes problematic since the typical setup with the graphql-spring-boot-starter primarily supports subscription handling over Websockets, which leaves you in a bind.

Your attempts to add another websocket endpoint via @ ServerEndpoint or a custom HandlerMapping have not yielded the expected results. So how can you solve this?

Understanding the Solution

Our solution involves creating a custom WebSocketController that serves as an entry point for your GraphQL websocket operations. Let’s break this down step-by-step.

Step 1: Create a WebSocketController

First, you need a RestController that will handle the incoming requests. It connects your websocket to the underlying GraphQL logic. Here's a simplified version of what that could look like:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Implement the WebSocketMessage Consumer

Next, we will implement the consumer interface GraphQLWebsocketMessageConsumer. This class will manage incoming messages and relay them to your GraphQL resolver logic.

[[See Video to Reveal this Text or Code Snippet]]

Important Areas to Note

WebSocketSession: This object allows you to send/receive messages over the websocket.

GraphQLInvoker: It executes the GraphQL Query or Mutation.

Publisher: It handles incoming messages and emits them as output.

Security Considerations

This solution does not currently implement any security mechanisms such as authentication or session handling. It’s crucial for real-world applications to ensure that proper security measures are implemented to protect your API and data.

Conclusion

By following the steps outlined above, you will be on your way to successfully routing GraphQL Queries and Mutations over a websocket in your Spring Boot application. Combining GraphQL with websocket technology opens up numerous possibilities for building real-time features that can enhance user experience.

Happy coding!