Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Re-Architecting Applications (Without a Rewrite!)
Search
Daniel Lew
February 10, 2018
Programming
8
2.7k
Re-Architecting Applications (Without a Rewrite!)
Talk given at DevFestMN 2018 & MinneBar 13.
Recording here:
https://youtu.be/dKm7MKoxVIg
Daniel Lew
February 10, 2018
Tweet
Share
More Decks by Daniel Lew
See All by Daniel Lew
Finding Meaningful, Mission-Driven Work
dlew
0
69
Things Maybe You Don't Know as a Newer Developer
dlew
1
92
Maintaining Software Correctness
dlew
4
870
Grokking Coroutines (MinneBar)
dlew
5
550
ClimateChangeTech.pdf
dlew
0
99
What Tech Can Do About Climate Change
dlew
0
530
Grokking Coroutines
dlew
5
1.1k
Automated Tests Aren't Enough
dlew
0
460
The Importance of Developer Communities
dlew
0
88
Other Decks in Programming
See All in Programming
Synchronizationを支える技術
s_shimotori
1
150
Snowflake x dbtで作るセキュアでアジャイルなデータ基盤
tsoshiro
2
430
ECS Service Connectのこれまでのアップデートと今後のRoadmapを見てみる
tkikuc
2
210
Outline View in SwiftUI
1024jp
1
170
Kubernetes for Data Engineers: Building Scalable, Reliable Data Pipelines
sucitw
1
200
Realtime API 入門
riofujimon
0
110
CSC305 Lecture 13
javiergs
PRO
0
130
アジャイルを支えるテストアーキテクチャ設計/Test Architecting for Agile
goyoki
7
2.8k
CSC509 Lecture 09
javiergs
PRO
0
110
デプロイを任されたので、教わった通りにデプロイしたら障害になった件 ~俺のやらかしを越えてゆけ~
techouse
52
32k
CPython 인터프리터 구조 파헤치기 - PyCon Korea 24
kennethanceyer
0
250
Googleのテストサイズを活用したテスト環境の構築
toms74209200
0
270
Featured
See All Featured
Documentation Writing (for coders)
carmenintech
65
4.4k
No one is an island. Learnings from fostering a developers community.
thoeni
19
3k
"I'm Feeling Lucky" - Building Great Search Experiences for Today's Users (#IAC19)
danielanewman
226
22k
Save Time (by Creating Custom Rails Generators)
garrettdimon
PRO
27
800
What's in a price? How to price your products and services
michaelherold
243
12k
Agile that works and the tools we love
rasmusluckow
327
21k
Code Reviewing Like a Champion
maltzj
519
39k
The Power of CSS Pseudo Elements
geoffreycrofte
72
5.3k
KATA
mclloyd
29
13k
RailsConf 2023
tenderlove
29
880
個人開発の失敗を避けるイケてる考え方 / tips for indie hackers
panda_program
92
16k
Bash Introduction
62gerente
608
210k
Transcript
Re-architecting Applications (Without a Rewrite!) @danlew42
architecture: the structure and design of a system or product
None
None
None
None
None
“Model-View- Controller is the best thing since sliced bread.” ~Evil
Dan Lew
“OMG, I’m switching to MVC ASAP!” ~You Stability Some New
Architecture
Danger • Pure architectures require fresh code • Rewrites always
take longer than expected • Old code == battle tested • Expectations may not match reality
Goals • Introduce new architectures to existing codebase • Push
releases while re-architecting codebase
None
</Housing Metaphors>
Goal #1: Introduce new architectures to existing codebase
Re-Architecting Safely • Prevent overly ambitious rewrites • Prevent regrettable
architecture choices • Steps • Explore • Experiment • Expand • Embrace
Explore • What is the problem? • Define goals •
Define constraints • What are the solutions? • Brainstorm • Research
Experiment • Pick a project • Minimize work • Small
project • Simplified implementations • Minimize damage • Self-contained project • Unimportant project
Expand • Run more experiments • Pick projects wisely •
Use architecture in new ways • Pick hardest problems • Stretch architecture to limits
Embrace • Write all new code with new architecture •
Deprecate old architecture • Delete old code (optional)
Disclaimer Not an exact science
Goal #2: Push releases while re-architecting codebase
Can’t simultaneously use old and new architecture Can’t keep releasing
Old New Old + New
Parallel Development
Decouple Code BAD GOOD
Feature Flags
Shims
Shims
Offline Mode A parallel development success story
Online Only Offline Enabled
Decoupling Services Before After
Feature Flags
Shims Before After
Offline Mode • Project length: 1.5 years • Never stopped
releasing • Minimal UI changes • Gradual experimentation via flags • Switched over without anyone noticing • https://tech.trello.com/sync-architecture/
Failures With real life examples!
Explore Failures • Architecting with no purpose • Navi •
Choosing new and shiny without understanding • RxJava
Experiment Failures • Making the experiment too large • JavaScript:
The Good Parts • Not recognizing a failed experiment • Operations
Expand Failures • Choosing only easy problems • Identifiers •
Not recognizing a failed corner case • RxLifecycle
Embrace Failures • Continuing to expend effort on old architecture
• Fresh boards
Pet Peeve Telling everyone about an architecture before proving it
out!
Current Architecture Thoughts
Omni Models • Single model • Deserialized from JSON •
Written to ORM • Used by UI • Problems • Which fields are present? • How do we avoid mutability issues?
Domain-specific models • ApiModel • Only used when talking to
server • DbModel • Mutable, flexible • UiModel • Immutable, guarantees values • ApiModel <-> DbModel <-> UiModel
Unidirectional Architecture
Thanks for listening! @danlew42