Distributed Systems Demo Project

An example for a Distributed Systems project. It contains

• OrderUI: a JavaFX frontend
• OrderAPI: a REST-Service implemented with Sprint Boot
• two worker services: CookService and WasherService
• a messaging queue (RabbitMQ)
• and a database (PostgreSQL) prepared in a docker-compose.yml file

Scenario

Docker-Services

• queue
  • URL: localhost:5672
  • Web: localhost:15672
• orders_db
  • JDBC: localhost:5432

Requirements

• Docker

Start

docker-compose up

Documentations

RabbitMQ Tutorial

• see RabbitMQ

RabbitMQ Management

• see Hands-On RabbitMQ Management-Plugin

docker exec -it <containerid> bash

• Show existing queues:

rabbitmqctl list_queues

RabbitMQ Install Management-Plugin:

apt install wget, python3
rabbitmq-plugins enable rabbitmq_management
wget http://localhost:15672/cli/rabbitmqadmin
mv rabbitmqadmin /usr/local/bin
chmod a+x /usr/local/bin/rabbitmqadmin

• Get contents of a Queue:

rabbitmqadmin get queue=example

• Create Queues:

rabbitmqadmin declare queue name=re_spaces

See also Stackoverflow