How do you implement RabbitMQ RPC in a Spring Boot application?

Table of Contents

• Introduction
• Setting Up RabbitMQ for RPC
  • 1. Define Request and Reply Queues
    • Example Configuration:
• Implementing the RPC Server
  • 2. Create a Consumer for Handling Requests
    • Example Server Code:
• Implementing the RPC Client
  • 3. Use RabbitTemplate for Sending Requests and Receiving Responses
    • Example Client Code:
    • Example Usage:
• Practical Example: Currency Conversion Service
  • Scenario
    • Configuration:
    • Server:
    • Client:
• Conclusion

Introduction

RabbitMQ supports Remote Procedure Calls (RPC) for synchronous communication between services. RPC enables a client to send a request to a server and wait for a response, making it ideal for scenarios requiring direct communication with a response. In Spring Boot, RabbitMQ's RPC mechanism can be implemented using RabbitTemplate and @RabbitListener.

Setting Up RabbitMQ for RPC

1. Define Request and Reply Queues

Create separate queues for sending requests and receiving responses.

Example Configuration:

Implementing the RPC Server

2. Create a Consumer for Handling Requests

Use @RabbitListener to process incoming messages from the request queue and send responses to the reply queue.

Example Server Code:

Implementing the RPC Client

3. Use RabbitTemplate for Sending Requests and Receiving Responses

The RabbitTemplate.convertSendAndReceive method handles sending requests and waiting for responses.

Example Client Code:

Example Usage:

Practical Example: Currency Conversion Service

Scenario

A client sends a currency conversion request to the server. The server processes the request and returns the converted amount.

Configuration:

Server:

Client:

Expected Output:

Conclusion

Implementing RabbitMQ RPC in Spring Boot enables synchronous request-response communication, making it suitable for scenarios like currency conversion or real-time processing tasks. By configuring queues, using RabbitTemplate for the client, and @RabbitListener for the server, you can efficiently build RPC mechanisms. This approach enhances communication reliability and simplicity in distributed systems.