ecommerce

creating an ecommerce app as part of learning springboot and angular

learning intent

Modify original intent for front-end react. To learn microservices- deploy on docker

application checklist (backend)

App users(basic) to be able to:

• CRU user
• CRUD item
• CRU purchaseLog(sentOut, delivered, reviews)
• CRUD cart

App users(superuser)

• CRUD user
• CRUD item
• CRUD purchaseLog
• CRUD cart

to implement

• JWT for session management (non logged in users to be able to use non user features)
• account password change in app
• drawing of data for benefit of buyers'/sellers'
• payment page after cart checkout page, for user to choose payment choice
• payment release only after buyer confirms delivery or after a 2 weeks timeframe from when user confirm delivery

features implemented

• frontend validation, show that current quantity in cart is too much. insufficient quantity
• frontend validation, show that cart cost is more than user balance

progress

• Run a single container in docker
• Running multiple containers using docker-compose.yml (setting conditions for individual container run depending on status of another container)
• Communication between different containers using exchange and postForObject, postForEntity etc
• Communication with front end (CORS error)
• Setting up session creation, validation and invalidation
• Error handling, throwing and handling errors
• Session authentication and validation with Jwt, springboot security (authorisation required, jwt token stored in Session Cookie)
• Axon saga implementation for checkout- no changes to database if any issue is encountered during checkout in any of the modules
• Meet requirements set (in progress)

Steps

https://www.baeldung.com/dockerizing-spring-boot-application

• 'localhost' on application.properties to be replaced with 'host.docker.internal'
• To run mvn clean compile -DskipTests (running with test will lead to compilation failure due to the changes in datasource url.
• Amendments to Dockerfile: FROM openjdk:17-jdk-slim MAINTAINER clivan COPY target/ecommerce-0.0.1-SNAPSHOT.jar docker-ecommerce-0.0.1-SNAPSHOT.jar ENTRYPOINT ["java","-jar","/docker-ecommerce-0.0.1-SNAPSHOT.jar"]
• Docker file to be saved in 1 level below target.

learning opportunities by chance (not mentioned in progress)

• configured windows, ubuntu and zsh

sidetracks

logging in microservices- using elasticsearch, kibana and logstash

• on hold

Axon Saga- microservices

• created core-api to be an independent jar containing common events and commands used by modules, required for commands and events to be recognised across modules
• skipped configurations in pom.xml for core-api, required for packages to be able to be read and used by modules
• 'rollback-only' issue resulting in saga ending immediately the moment an exception is thrown in the constructor of another aggregate, i wrapped the sending of command in the saga file, to manage the exception thrown so that the saga does not end
• commands sent in the catch block to the modules affected to reverse changes
• conversion to specific java objects solely so that the object can be stored in commands to be sent between different microservices modules (marked with A in front on object name)