Table of Contents

1. Summary
2. Prerequisites and Installation
3. Tech Stack
4. How To Run And Test Application
5. How To Run And Test Application with Dockerfile (OPTIONAL)
6. How To Run And Test Application with docker-compose.yml (OPTIONAL)
7. Redis Commands
8. Google Play Integrity API
9. References

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Summary

live-data-service is providing CRUD operations to process live events

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Prerequisites

• Java 21+ needs to be installed export JAVA_HOME=$(/usr/libexec/java_home -v 21)
• Maven needs to be installed
• Docker needs to be installed
• Install any Java IDE (Eclipse, STS, Intellij etc..) and ensure you are able to launch
• Clone or checkout the project from version control system (git) and follow below steps

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Tech_Stack

• Java 21

• Spring Boot 3

• H2 Database (Default values are provided below)

  • Default H2 Database Url: http://localhost:8080/h2-console
  • username: sa
  • password: sa
  • url: jdbc:h2:mem:MB_TEST;DB_CLOSE_DELAY=-1

• Swagger: http://localhost:8080/swagger-ui/index.html

• Flyway for database migration

• Centralize exception handling by ControllerAdvice

• Mapstruct to map different type of objects to each other

• Micrometer dependencies were added to track the logs easily

• Testcontainers dependencies were added for integration tests

• docker-compose.yml contains Grafana, Prometheus and Zipkin to track metrics, Kafka for event-driven architecture, Redis for caching, Elasticsearch for search and analytics engine

  • Actuator: http://localhost:8080/actuator
  • Kafka UI: http://localhost:9091/
  • Grafana
    • Login Credentials
      • Url: http://localhost:3000/
      • Email or username: admin
      • Password: admin
    • Add Prometheus Datasource
      • Url: http://host.docker.internal:9090
    • Add Dashboards
      • https://grafana.com/grafana/dashboards/4701-jvm-micrometer/
      • https://grafana.com/grafana/dashboards/5373-micrometer-spring-throughput/
  • Prometheus
    • Actuator: http://localhost:8080/actuator/prometheus
    • Prometheus: http://localhost:9090/graph
  • Zipkin UI: http://localhost:9411
  • Elasticsearch: http://localhost:9200/
  • Kibana: http://localhost:5601/

• Test via Postman (OPTIONAL):

  1. Import Postman Collection
  2. Right-click the imported Postman Collection and click Run Collection section.
  3. On the right panel choose Functional or Performance section, edit Run configuration and click run to test the application.

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How_To_Run_And_Test_Application

• Please follow the following steps, if you want to build and run Spring Boot Application

*** Run the application by following these steps.

1 - cd live-data-service
2 - docker-compose up -d
3 - mvn clean install or mvn clean package 
4 - mvn spring-boot:run

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How_To_Run_And_Test_Dockerfile

• Please follow the following steps, if you want to build and run Dockerfile

1 - cd live-data-service
2 - docker-compose up -d
3 - mvn clean install or mvn clean package --------THIS IS MUST---------
4 - docker build -t mb/live-data-service .
5 - docker run -p 8080:8080 mb/live-data-service

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How_To_Run_And_Test_Docker_Compose

• Please follow the following steps, if you want to build and run docker-compose.yml
• Remove live-data-service service comment in services section in docker-compose.yml
• Docker -> Preferences -> Resources -> File sharing -> click add button and select prometheus folder under the /src/main/resources or just add /etc/prometheus path -> Apply & Restart
  • 

1 - cd live-data-service
2 - mvn clean install or mvn clean package --------THIS IS MUST---------
3 - docker build -t mb/live-data-service .
4 - docker-compose up -d

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Redis

• The following command returns all matched data by 'keyPattern:*' pattern

  • redis-cli --scan --pattern 'keyPattern:*'

• The following command deletes all matched data by 'keyPattern:*' pattern

  • redis-cli KEYS 'keyPattern:*' | xargs redis-cli DEL

• The following command finds TYPE in redis with KEY

  • TYPE key -> TYPE xxx:hashedIdOrSomethingElse

• The following commands search by TYPE

  • for "string" TYPE: get key
  • for "hash" TYPE: hgetall key
  • for "list" TYPE: lrange key 0 -1
  • for "set" TYPE: smembers key
  • for "zset" TYPE: zrange key 0 -1 withScores

• RedisInsight: http://localhost:8001/

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Google_Play_Integrity_API

• Setup Firebase or Just follow the following steps to Initialize the SDK, Create and Download Firebase Credentials JSON File
  • After JSON file is downloaded, copy the content of downloaded file and replace play-integrity-credentials.json content with that copied text
  • Replace application-name value in application.yml file with project_id variable that is in play-integrity-credentials.json
  • HELPFUL LINK BUT IT SHOULD NOT BE NEEDED

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References

• Metrics Made Easy Via Spring Actuator, Docker, Prometheus, and Grafana
• https://prometheus.io/docs/prometheus/latest/installation/#volumes-bind-mount
• Spring Boot Rest Controller Unit Test with @WebMvcTest
• Redis Commands
• Running RedisInsight using Docker Compose
• Google Play Integrity API
• A Guide to Querydsl with JPA