This sample application demonstrates a simple ticket service built with Lagom. It contains two services: a user service, for managing users, and an event service, for managing events and ticket reservations.

Event service consumes data fetched from user service.

Both services persist its data to a relational database using Lagom's persistence API and demonstrate how to persist state using Lagom.

This sample requires Kafka and Postgres as external services. They are pre-configured in docker-compose.yml file. Meaning that before running the service, you first need to start the services using the following command:

docker-compose up -d

Postgres instances will be available on ports 5433 for user service and 5434 for event service and Kafka on port 9092.

After setting up all the requirements, to run the application in dev mode, execute the following command:

sbt runAll

After setting up all the requirements, to run tests, execute the following command:

sbt test

The user service offers three REST endpoints:

• Create a new user:

curl -v -H "Content-Type: application/json" -d '{"name": "Jon Kilroy"}' -X POST http://localhost:9000/user | jq .

• Get a user:

curl -v http://localhost:9000/user/4db6ed98-a68f-4a54-9d6e-8aecf57a7684 | jq .

• Add number of reserved tickets (cnt can be less than 0):

curl -v -H "Content-Type: application/json" -d '{"cnt": 4}' -X PATCH http://localhost:9000/user/4db6ed98-a68f-4a54-9d6e-8aecf57a7684 | jq .

The event service offers three REST endpoints:

• Create a new event:

curl -v -H "Content-Type: application/json" -d '{"name": "Olympics 2021", "availableTickets": 30}' -X POST http://localhost:9000/event | jq .

• Get an event:

curl -v http://localhost:9000/event/6e94190b-8d7c-40b2-ac61-9169d46130b4 | jq .

• Create a reservation for given event and user:

curl -v -H "Content-Type: application/json" \
  -d '{"userId": "80bf5592-c2bf-40af-ba90-f624f0fb1d2e", "ticketsCnt": 4, "reservationTime": "2020-12-03T10:15:30+01:00[Europe/Warsaw]"}' \
  -X POST \
  http://localhost:9000/event/6e94190b-8d7c-40b2-ac61-9169d46130b4/reservation | jq .