About Tickets

Business goal

Ticketing system is a cutting-edge concert tickets selling platform with a revolutionary pricing algorithm and super friendly for Concert Promoters to sell their concerts with a remarkable profit.

Full documentation here: Tickets doc.pdf

Purpose

The system is built as a training example for Testing Microservices.

Architecture

The overall System consists of many microservices. This repository holds a subset of them, essential for Promoter to create concerts. High level architecture is below.

Importing to IDE

How to import

You should import the Tickets/build.gradle as a root project to your IDE.

Project Structure

Important paths in project are:

Tickets
└── infra/kafka/docker-compose.yml              // Use to start Apache Kafka in docker on your machine
└── libs/SharedLib                              // Java library embedded in services
└── services                                    // Microservices in Tickets system
│   └── Pricing
│   └── Promoter
|       └── api-stubs/run-contract-stubs.sh     // runs Promoter API Stubs based on Contract Tests to test promoter-ui
│   └── promoter-ui
└── SystemTests/TicketingTests                    // separate project holding E2E System Tests for Ticketing

Setup Contract tests

Contract tests require additional setup on your machine to run. make sure you follow contract tests configuration.

Verify after import

Execute tests to check if the system is working on your machine and tests are green: Tickets test --all or ./gradlew test

Speed up test execution

Gradle has a bug, and it may execute tests slowly. Use IntelliJ Idea for build and test execution.

Go to: Settings -> Build, Execution Deployment -> Build Tools -> Gradle and set Build and Run using and Run tests using to value: IntelliJ Idea (not Gradle)

How to run the system

Repository contains gradle and IntelliJ run configurations. IntelliJ configurations should be automatically imported once Tickets project is imported.

Some run configurations are using Multirun plugin to start all microservices in the system. Consider installing it.

To see the system working, start services:

Service	IntelliJ Idea task	Manual command
Kafka	kafka run	run docker-compose.yml using docker compose up under infra/kafka/
Promoter GUI	promoter-ui run	ng serve from promoter-ui/ (starts on port 4200)
Promoter	Promoter run	./gradlew bootRun from Promoter/
Pricing	Pricing run	./gradlew bootRun from Pricing/

Prerequisites

Backend

Installed:

• gradle
• JDK 21+
• IDE (recommended: IntelliJ Idea)
• git
• docker
• docker compose
• Operating System: Ubuntu, Mac, Windows. Note: docker on Windows can be unpredictable.

Web interface

Installed:

• node.js sudo apt install nodejs
• Angular npm install -g @angular/cli
• Protractor npm install -g protractor
• Chrome Browser

Before start, install node dependencies by running npm install from services/promoter-ui

Tests

Pricing, Promoter and SharedLib

• All internal tests are under src/test/java
• contract tests location is documented here

Execute gradle tasks by ./gradlew <task-name>

• test: runs all in-service tests
• contractTest: runs Spring Cloud Contract tests defined in /src/contractTests/resources/contracts

promoter-ui

Protractor tests are located under src/e2e/test

• protractor conf.js executes isolated GUI tests on promoter-ui. Note: execute from services/promoter-ui/src/e2e

TicketingTests

The project holds System Tests only, all under src/test with gradle task:

• test: runs tests against the Tickets System

Contract tests

Two tools for contract testing are implemented: Spring Cloud Contract and PACT. Contract testing requires additional infrastructure. To make contract tests green, follow instructions below.

Spring Cloud Contract

Spring Cloud Contracts [SCC] uses local maven repository to publish contracts defined in sources. If producer contracts are missing in local repository, the consumer tests may fail because of AetherStubDownloader cannot download stubs.

Publishing

Publish contracts execute ./gradlew publishToMavenLocal in Promoter and Pricing or run IntelliJ configs named Promoter/Pricing contract publish.

Promoter API Stubs

To start Promoter Stub (optional), based on Contract tests, see README

Locations

• Contracts are under src/contractTest/resources
• Generated contract tests are in build/generated-test-sources/contractTest

Pact

Tests named pactVerificationTestTemplate are PACT contract tests, and they will be failing on your machine as they require secret token to PACT Broker. Secret will be provided to you later. You can ignore these failures for now.

Publishing

There are Consumer, Provider and Pact Broker contracts verified using Pact Flow. Contract tests are fired like any other Framework Tests. There are additional steps for publishing pact verification results:

• consumer: ./gradlew pactPublish (update pact consumerVersion if needed in build.gradle)
• provider: published automatically after verification, by setting pact.verifier.publishResults to true in setupTestTarget

Locations

• provider tests have suffix pact*Test
• consumer tests are annotated with @PactTestFor

Set credentials in env vars

Pact Broker is secured. Credentials are stored as environment variables. To set them execute:

Linux

export VAR_NAME="<value>"     # add this line to /etc/profile to make it persistent
source ~/.bashrc              # reload new vars into current session
printenv VAR_NAME             # check if variable is set

Windows

$env:VAR_NAME="<value>"
$env:VAR_NAME                 # check if variable is set

Branching and Rebasing

Complete solution is on the main branch.

Development

All feature development is made in branches as follows:

1. start new branch from main
2. When finished, Issue PR to main, squashing commits.
3. Remember to rebase assignment branches on main to reflect new features (see Rebasing)

Branches with assignments

Training assignments:

• use branches corresponding to the tasks and their steps
• are prefixed with x- in the branch name

Rebasing

Branches with assignments must be rebased on main to reflect new features added to main in assignments branches. Use rebaser.sh to rebase:

1. Navigate to Tickets/.github directory (on Windows use Git Bash)
2. Run ./rebaser.sh to rebase and push all branches starting with x- on main

Open API Docs

Auto generated Open API Docs are available under:

• json: http://localhost:{port}/v3/api-docs
• yaml: http://localhost:{port}/v3/api-docs.yaml