23년 3월 18일 FCC Meet up

FCC (Free Code Camp) 의 "How to structure your backend" Meet up

제목 : How to structure your backend

일시 : 2023-03-18 14:00

주제 : 백엔드

발표자 : Lee Sungwoo

Questions

• Waht is a backend server, how it works?
• What stacks are available?
• How can I organize the code?
• Common patterns?

What is "Backend"

client-web server-app(backend)-DB

Needs

• Computer Networks
• DB
• Patterns

How does it work?

Computer Network Basics

• Rules and procedures of communication between devices
• Hour glass model

What happens behind the seen?

• Scheme
• Domain Name
• Port
• Path to the file
• Parameter
• Anchor

ref. Mozila What is a URL

HTTP

• DNS Server
  • DB for URLS as Keys, IPs for Values
• Status
  • Mozila HTTP Status

TCP

• Connection oriented
• Reliable
• Guarantees order
• Checke error

IP

• Deliver data to the device you intend
• No guarantee

Internet Core Protocols: The Definitive Guide

Stacks

• node / .NET / C# / JAVA / PHP
• MERN !

How can I organize my code ?

• Layers
• Feature slices
• Microservices

ref. slices-vs-layers

common DDD concepts

• Entity
  • Consistant Identity
  • To save, need repository pattern / DAO
• Value Object
  • identitfied by only it's attruvutes
• Aggregate
  • Cluster of entities and value within some boundary
  • Root ( Access point )
• Repository ( Abstraction and Domain Layer)
  • Collection
  • Only list of Aggregate root

Domain Driven Design by Eric Evans

Hands on

swlee052/backend-101

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TCP Evolving ?
HTTP 3.0 ?

Questions

• Difference between Aggregate and Repository
  • Aggregate is cluster of entities and value objects within some bounday and have one access point(Root Aggregate)
  • Repository is Object that holds collection of root aggregates and methods to handle them.
• In ORM, do they give some Magic method for comparision of @valueObject ?
  • 질문하지는 못했는데 아닌듯. 직접 짜야하는 것 같다.
    ref. using-value-objects-with-jpa

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느낀 점

• 강의를 들을 땐 강연자의 말하기에 집중해야지 PPT 에 집중하면 화자가 전달하려는 내용을 놓치기 쉽다. 특히 모국어가 아니라면.
• 영어를 쓸 때 집중력이 떨어지는 걸 느꼈다. 모국어가 아니라서 그런 것 같다. 내가 질문한 내용에 대한 이야기를 하는 중에도 정신 바짝 안차리면 그냥 흘려듣기가 되버렸다.
• OSI / TCP/IP 모델과 각종 프로토콜에 대한 이해도가 높아졌다. 아래의 그림처럼 HTTP는 TCP 위에 동작하고 TCP 는 IP 위에 동작하는 것이다.