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Sustainable SPA with DDD The beginning of a won...
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Manfred Steyer
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December 09, 2019
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Manfred Steyer
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Transcript
@ManfredSteyer Sustainable SPA with DDD The beginning of a wonderful
friendship? angular-architects.io
What do we need for a good architecture? Experience
@ManfredSteyer Sharing Experience for Architectures BEST PRACTICES PATTERNS METHODOLOGY
@ManfredSteyer Domain Driven Design
@ManfredSteyer How to create sustainable frontend architecture with ideas from
DDD? ?
@ManfredSteyer How to create sustainable frontend architecture with ideas from
DDD? ?
@ManfredSteyer Contents 1) DDD in a Nutshell 2) Angular Monorepos
3) Monorepos & DDD 4) DDD & Micro Frontends
@ManfredSteyer About me… • Manfred Steyer ANGULARarchitects.io • Angular Trainings
and Consultancy • Google Developer Expert (GDE) • Trusted Collaborator in the Angular Team Page ▪ 8 Manfred Steyer Public: Frankfurt, Munich, Vienna In-House: everywhere http://softwarearchitekt.at/workshops
@ManfredSteyer 1) DDD in a nutshell
@ManfredSteyer Domain Driven Design Strategic Design Tactical Design Decomposing a
System Design Patterns & Practices
@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 2) Monorepos
@ManfredSteyer Workspace
@ManfredSteyer Advantages No version conflicts No burden with distributing libs
@ManfredSteyer Moving back and forth Npm Registry
@ManfredSteyer https://nrwl.io/nx
@ManfredSteyer Visualize Module Structure
@ManfredSteyer 3) 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 Smart Comp. Dumb Comp.
@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 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 e. g.
data access 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 DEMO
@ManfredSteyer BLOG ANGULARarchitects.io
@ManfredSteyer Finegrained Libraries • Unit of recompilation • Unit of
retesting • Access restrictions • Information Hiding
@ManfredSteyer Facades and State Management
@ManfredSteyer Facade (Application Service) @Injectable({ providedIn: 'root' }) export class
ProductFacade { […] }
@ManfredSteyer Facade (Application Service) @Injectable({ providedIn: 'root' }) export class
ProductFacade { public products: Product[] = []; […] } State!
@ManfredSteyer Facade (Application Service) @Injectable({ providedIn: 'root' }) export class
ProductFacade { public products: Product[] = []; constructor(private productService: ProductService) { } […] }
@ManfredSteyer Facade (Application Service) @Injectable({ providedIn: 'root' }) export class
ProductFacade { public products: Product[] = []; constructor(private productService: ProductService) { } search(category: string): void { […] } }
@ManfredSteyer Facade (Application Service) @Injectable({ providedIn: 'root' }) export class
ProductFacade { public products: Product[] = []; constructor(private productService: ProductService) { } search(category: string): void { […] } } Angular has to pull :-(
@ManfredSteyer Facade (Application Service) @Injectable({ providedIn: 'root' }) export class
ProductFacade { public products: Observable<Product[]>; constructor(private productService: ProductService) { } search(category: string): void { […] } } Also key for messaging
@ManfredSteyer App Home Catalog Search RatingFacade ProductFacade SearchFacade Facades Have
State
@ManfredSteyer App Home Catalog Search RatingFacade ProductFacade SearchFacade Facades Have
State
@ManfredSteyer App Home Catalog Search RatingFacade ProductFacade SearchFacade Facades Have
State Store (z. B. Redux/ NGRX) Observable Action
@ManfredSteyer 4) Micro Frontends
@ManfredSteyer Catalog Ordering Shared Feature Feature Feature Feature Feature …
… … … … … … … … @ManfredSteyer e-Procurement App Deployment Monolith
@ManfredSteyer Catalog Ordering Shared Feature Feature Feature Feature Feature …
… … … … … … … … @ManfredSteyer Catalog App Ordering App Option 1: One App per Domain
@ManfredSteyer Catalog Ordering Shared Feature Feature Feature Feature Feature …
… … … … … … … … @ManfredSteyer Catalog App Ordering App Option 2: One Monorepo per Domain Publish shared libs seperately via npm Different Versions
@ManfredSteyer
@ManfredSteyer
@ManfredSteyer ✓ Simple Loosing State Load a new
Application
@ManfredSteyer µService Providing a (SPA based) Shell µApp µApp µApp
Shell ▪ iframes ▪ Bootstrapping several SPAs ▪ + Lazy Loading
@ManfredSteyer Loading MicroApps <script src="micro-app.bundle.js"></script> <micro-app></micro-app>
@ManfredSteyer DEMO
@ManfredSteyer BLOG ANGULARarchitects.io
Summary • Slicing into sub-domains • Slicing into layers •
Finegrained libraries • Enforce restrictions • Fits to micro frontends
@ManfredSteyer
@ManfredSteyer Contact and Downloads [web] ANGULARarchitects.io [twitter] ManfredSteyer d Slides
& Examples Public: Frankfurt, Munich, Vienna In-House: everywhere http://softwarearchitekt.at/workshops