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RabbitMQ Amusement Park Ticketing System

This repository contains my implementation of an asynchronous messaging system for an amusement park ticketing application, using RabbitMQ. This project is part of an assignment I completed for the Cloud Software and Systems course offered by the Department of Computer Science at Aalto University. It focuses on building distributed systems with asynchronous messaging principles.

Project Overview

The application simulates an amusement park ticketing system, comprising of three main components:

  • Ticket Machine (TicketEventProducer): Simulates customers tapping their phone to issue ticket events.
  • Ticket Worker (TicketWorker): Processes ticket events by verifying customer details and ride prices, and then notifying the customers.
  • Customer App (CustomerEventConsumer): Receives notifications about ticket processing for individual customers.

Message Flow Diagram

flowchart TD
    A(Ticket Machine) -->|Direct Exchange| B[Worker Queue]
    B --> |Invalid|Z[Dead Letter Exchange]
    B --> |Valid| C{ }
    C --> Y[Worker 1]
    C --> X[Worker 2]
    X --> D[Topic Exchange]
    Y --> D[Topic Exchange]
    D --> E(Customer App)
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System Architecture

sequenceDiagram
    participant TM as Ticket Machine
    participant TW as Ticket Worker
    participant CA as Customer App
    participant RMQ as RabbitMQ Broker

    TM->>RMQ: TicketEvent
    RMQ->>TW: Forward TicketEvent
    TW->>TW: Process Event
    TW->>RMQ: CustomerEvent
    RMQ->>CA: Forward CustomerEvent to relevant Customer
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