ECABS SERVICE

Assignee: Nikolaos Christidis (nick.christidis@yahoo.com)

Infrastructure

• RabbitMQ
• PostgreSQL

In order to start the infrastructure, execute: docker-compose up, you can see more info at: docker-compose.yml file

Modules

• booking-common-infra contains common infrastructure code, such as: DTOs, Errors, RabbitMQ queues and exchanges, etc.

• booking-consumer contains the service code in order to consume messages from rabbit mq and store this info to the database (postgresql).

• booking-domain contains the domain entities and repositories, that other modules use.

• booking-producer contains the service code in order to expose rest endpoints, that provide validation on input and produce messages to rabbitmq.

• data-injector contains code in order to produce traffic to the whole application-platform, such as create booking scenario, edit booking scenario, delete booking scenario.

• e2e-tests uses the code from module: data-injector in order to test the functionality of the whole application-platform

Run E2E Tests (needs infrastructure to be up)

1. You need to have run infrastructure (rabbitmq and postgresql), producer and consumer services also.
2. cd data-injector/ and execute there: mvn clean install
3. cd e2e-tests/
4. mvn clean test

Building prerequisites for producer and consumer service

1. cd booking-domain/
2. mvn clean install
3. cd booking-common-infra
4. mvn clean install

Build and run booking-consumer (needs infrastructure to be up)

1. cd booking-consumer/
2. mvn clean install
3. java -jar target/booking-consumer-1.0.0.jar

Important Note

For consumption from RabbitMQ and saving to PostgreSQL I have applied Best-Effort 1PC(Phase Commit) more info: https://www.infoworld.com/article/2077963/distributed-transactions-in-spring--with-and-without-xa.html and consumption operations are idempotent @IdempotentOperation

Build and run booking-producer (needs infrastructure to be up)

1. cd booking-producer/
2. mvn clean install
3. java -jar target/booking-producer-1.0.0.jar

Important Note

In order to create queues and exchanges automatically (via spring bootstrapping) you should start first this service (booking-producer)

Assignment's Diagram

Data Injector MicroBenchmark

Error Handling with Wait Queue and Parking Lot Queue

TODO: re-fire messages from parking-lot-queue via a rest endpoint.