**## Microservices Challenge

This is how we faced the challenge of creating an application that allows the sending of a message through an Angular-based front-end app, providing an email and a phone number. The message is published to a RabbitMQ exchange that fuels the email queue, SMS queue and a message queue with the goal of how to build such application using Spring Boot, AWS Java SDK, Gmail and explore how the AMPQ protocol fits these requirements.

Table of contents

• Table of contents
• Overview
• Screenshot
• Links
• Built with
• How I did it
• Continued development
  • Useful resources
• Author
• Acknowledgments

Overview

This notification app has been coded using Spring Boot, Spring JPA, Spring AWS SDK, Spring RabbitMQ, MapStruct, Jackson, Lombok, OpenAPI, H2 DB.

• src
  • main
  • java
    • com/xxx/challenge/notification
      • config
      • controller
      • dto
      • entity
        • enums
      • mapper
      • payload
      • repository
      • services
        • exceptions
  • resources
    • db.migration
  • test

Requirements

- rabbitMQ container running at 127.0.0.1:5672
- H2 database classpath:data/notification
- profile active: dev
- service socket: 127.0.0.1:8095

Screenshot

Links

• Live Site URL: [http://127.0.0.1:8095/swagger-ui/index.html]

Built with

How I did it

package com.challenge.notification.entity.enums;

public enum MessageStatus {

    DELIVERED_SMS(1),
    DELIVERED_EMAIL(2),
    READY_TO_DELIVER(3),
    WAITING_EXCHANGE(4);

    private final int codeStatus;

    private MessageStatus(int codeStatus) {
        this.codeStatus = codeStatus;
    }

    public int getCodeStatus() {
        return codeStatus;
    }

    public static MessageStatus valueOf(int codeStatus) {
        for (MessageStatus value : MessageStatus.values()) {
            if (value.getCodeStatus() == codeStatus) {
                return value;
            }
        }

        throw new IllegalArgumentException("Invalid MessageStatus code");
    }
}

Continued development

• Unit Tests
• Provide a Json to FrontEnd including
  • delivery status of each message to frontend
  • count of messages consumed by subscriber
• Subscriber Authentication
  • Spring JWT-OAuth2
• Messages Pagination

Useful resources

• [https://spring.io] Awesome Java framework!.
• [https://start.spring.io/] Handy startup tool.
• [https://mvnrepository.com] Tools that help tackle the beast

Author

• Website - [https://ferreiras.dev.br] Acknowledgments