Sustainable Architectures with Angular, Monorepos and DDD @iJS 2019 in Munich

@ManfredSteyer Sustainable Architectures with Angular, Monorepos and DDD Manfred Steyer
SOFTWAREarchitekt.at ManfredSteyer

@ManfredSteyer What do we need for a good architecture ?
Experience

@ManfredSteyer Sharing Experience for Architectures BEST PRACTICES PATTERNS METHODOLOGY

@ManfredSteyer Domain Driven Design

@ManfredSteyer How can create sustainable frontend architectures with ideas from
DDD?

@ManfredSteyer Contents 1) Strategic DDD 2) Angular Monorepos 3) Nx
Monorepos and DDD 4) DDD & Micro Frontends

@ManfredSteyer About me… • Manfred Steyer SOFTWAREarchitekt.at • Angular Trainings
and Consultancy • Google Developer Expert (GDE) • Trusted Collaborator in the Angular Team Page ▪ 9 Manfred Steyer Public: Frankfurt, Munich, Vienna In-House: everywhere http://softwarearchitekt.at/workshops

@ManfredSteyer DDD in a nutshell

@ManfredSteyer Domain Driven Design Strategic Design Tactical Design Decomposing a
System Design Patterns & Practices

@ManfredSteyer This is what Strategic DDD prevents

@ManfredSteyer Example e-Procurement System

@ManfredSteyer Catalog Approval Specification Ordering Example Sub-Domains

@ManfredSteyer Request Product Specify Order Approve Order Send Order Request
Budget Approve Budget Budget Hierarchy Manager Manager Employee Expert Manager Buying Agent Product

@ManfredSteyer Catalog Approval Bounded Context Ubiquitous Language

@ManfredSteyer Catalog Approval Specification Ordering Context Map

@ManfredSteyer Approval Specification Context Map Catalog Catalog Shared Kernel

@ManfredSteyer Catalog Approval API

@ManfredSteyer Catalog Approval Calc VAT Calc VAT Seperate Ways

@ManfredSteyer Lots of additional approaches for cross-domain communication …

@ManfredSteyer 2) Monorepos

@ManfredSteyer Workspace

@ManfredSteyer Creating a Workspace npm install -g @angular/cli ng new
workspace cd workspace ng generate app my-app ng generate lib my-lib ng serve --project my-app ng build --project my-app

@ManfredSteyer Advantages Everyone uses the latest versions No version conflicts
No burden with distributing libs Creating new libs: Adding folder Experience: Successfully used at Google, Facebook, …

@ManfredSteyer Moving back and forth Npm Registry

@ManfredSteyer Tooling & Generator https://nrwl.io/nx

@ManfredSteyer Visualize Module Structure

@ManfredSteyer Nx Monorepos and Strategic Design

@ManfredSteyer Catalog Ordering Shared Feature Feature Feature Feature Feature UI
UI UI UI UI UI UI UI UI Domain Domain Domain Domain Domain Domain Util Util Util Util Util Util Enterprise Monorepo Patterns, Nrwl 2018: https://tinyurl.com/y2jjxld7 @ManfredSteyer Shared Kernel (if really needed) & other libs

@ManfredSteyer Catalog Ordering Shared Feature API Feature Feature Feature Feature
UI UI UI UI UI UI UI UI UI Domain Domain Domain Domain Domain Domain Util Util Util Util Util Util @ManfredSteyer

@ManfredSteyer Application Domain Infrastructure Isolate your domain! Domain Domain Infrastructure
e. g. data access Application Use case specific facades, state management Entities, biz logic

@ManfredSteyer Alternatives to layering • e. g. Hexagonal Architecture, Clean
Architecture • Anyway: We need to restrict access b/w libraries

@ManfredSteyer Finegrained Libraries • Unit of recompilation • Unit of
retesting • Access restrictions • Prevent Cycles • Information Hiding • Future replacement for NgModules?

@ManfredSteyer DEMO

@ManfredSteyer DDD and Micro Frontends? Short outlook

@ManfredSteyer Catalog Ordering Shared Feature Feature Feature Feature Feature …
… … … … … … … … @ManfredSteyer e-Procurement App Deployment Monolith

… … … … … … … … @ManfredSteyer Catalog App Ordering App Option 1: One App per Domain

… … … … … … … … @ManfredSteyer Catalog App Ordering App Option 2: One Monorepo per Domain Publish shared libs seperately via npm

@ManfredSteyer Summary Slicing into sub-domains Slicing into layers Relaxed layering
Finegrained libraries Enforce restrictions Fits to micro frontends

@ManfredSteyer

@ManfredSteyer Contact and Downloads [mail] [email protected] [web] SOFTWAREarchitekt.at [twitter] ManfredSteyer
d Slides & Examples Public: Frankfurt, Munich, Vienna In-House: everywhere http://softwarearchitekt.at/workshops

Sustainable Architectures with Angular, Monorep...

Sustainable Architectures with Angular, Monorepos and DDD @iJS 2019 in Munich

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