Leo's Music Shop API in Java (Spring Boot)

This is another very cool API for Leo's Music Shop.

For now this API only sells drum kits.

Motivation

I wanted to learn how Segment SDK in Java behaves in a Spring Boot application.

This is used to validate Segment application onboarding using Java/Spring Boot archetype. I believe it can be used for Groovy and Kotlin as well.

Architecture

Integration with Segment

This app uses Segment Analytics Java library to track events. The following events are tracked:

New Customer Registered
Guest Order Placed
Order Placed (for registered customers)

Running

You can run this app in your favorite IDE or generate a JAR and run it through the command line.

Prerequisites

For any mode, it's necessary to have a JDK installed. This project was written using the JDK 17, but it is code compatible with the JDK 11.

Three settings are required to be set:

jwt.secret (or JWT_SECRET environment variable): secret used to generate JWT tokens;
spring.profiles.active (or SPRING_PROFILES_ACTIVE environment variable): the active spring profile. Used to defined which database to use (see Database below);
segment.write-key (or SEGMENT_WRITE_KEY environment variable): The write key from your Segment source.

They are set by default in src/main/resources/application.properties. You can either modify the file, adding your configuration values, or set the corresponding environment variables.

Database selection

If you prefer to run the project with an in-memory database, this project has two options:

SQLite
H2 (the default)

If you prefer something more permanent, MySQL is supported. Just make sure to have a MySQL instance running. If needed, change the credentials at src/main/resources/persistence-mysql.properties.

To select which database to use, you can either:

Modify src/main/resources/application.properties file (spring.profiles.active property)
Start the application with a VM option: -Dspring.profiles.active=<database>.
Add an environment variable called SPRING_PROFILES_ACTIVE, whose possible values are below.

spring.profiles.active supports three different values:

sqlite
h2
mysql

If you want to use another database, this project uses JDBC and can be customized for any database that supports JDBC. Feel free to fork it and add the desired support.

Segment Setup

This app also requires the write key from your Segment source set. In src/main/resources/application.properties, change the value of segment.write-key to the corresponding write key registered in your source.

You can also set an environment variable called SEGMENT_WRITE_KEY with the value of your Segment source.

Running through the command line

This project can be run at the project root, with the command:

./gradlew bootRun

To run through your IDE, follow the corresponding instructions for the Spring Boot in Gradle archetype.

Building

To build the project, use:

./gradlew build

To run the built JAR, use:

java -jar leos-music-shop-api-version-SNAPSHOT.jar

Documentation

There's a Swagger interface configured at http://localhost:8080/swagger-ui.html

seg-leonelsanches/leos-music-shop-api-java