Sustainable SPA with DDD The beginning of a wonderful friendship? @dddsummit in Berlin

Transcript

1. 1.

   @ManfredSteyer Sustainable SPA with DDD The beginning of a wonderful

   friendship? angular-architects.io
2. 2.

   What do we need for a good architecture? Experience

3. 3.

   @ManfredSteyer Sharing Experience for Architectures BEST PRACTICES PATTERNS METHODOLOGY

4. 4.

   @ManfredSteyer Domain Driven Design

5. 5.

   @ManfredSteyer How to create sustainable frontend architecture with ideas from

   DDD? ?
6. 6.

   @ManfredSteyer How to create sustainable frontend architecture with ideas from

   DDD? ?
7. 7.

   @ManfredSteyer Contents 1) DDD in a Nutshell 2) Angular Monorepos

   3) Monorepos & DDD 4) DDD & Micro Frontends
8. 8.

   @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
9. 9.

   @ManfredSteyer 1) DDD in a nutshell

10. 10.

    @ManfredSteyer Domain Driven Design Strategic Design Tactical Design Decomposing a

    System Design Patterns & Practices
11. 11.

    @ManfredSteyer Domain Driven Design Strategic Design Tactical Design Decomposing a

    System Design Patterns & Practices
12. 12.

    @ManfredSteyer This is what Strategic DDD prevents

13. 13.

    @ManfredSteyer Example e-Procurement System

14. 14.

    @ManfredSteyer Catalog Approval Specification Ordering Example Sub-Domains

15. 15.

    @ManfredSteyer 2) Monorepos

16. 16.

    @ManfredSteyer Workspace

17. 17.

    @ManfredSteyer Advantages No version conflicts No burden with distributing libs

18. 18.

    @ManfredSteyer Moving back and forth Npm Registry

19. 19.

    @ManfredSteyer https://nrwl.io/nx

20. 20.

    @ManfredSteyer Visualize Module Structure

21. 21.

    @ManfredSteyer 3) Nx Monorepos and Strategic Design

22. 22.

    @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.
23. 23.

    @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
24. 24.

    @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
25. 25.

    @ManfredSteyer Application Domain Infrastructure Isolate your domain! Domain e. g.

    data access Use case specific facades, state management Entities, biz logic
26. 26.

    @ManfredSteyer Alternatives to layering • e. g. Hexagonal Architecture, Clean

    Architecture • Anyway: We need to restrict access b/w libraries
27. 27.

    @ManfredSteyer DEMO

28. 28.

    @ManfredSteyer BLOG ANGULARarchitects.io

29. 29.

    @ManfredSteyer Finegrained Libraries • Unit of recompilation • Unit of

    retesting • Access restrictions • Information Hiding
30. 30.

    @ManfredSteyer Facades and State Management

31. 31.

    @ManfredSteyer Facade (Application Service) @Injectable({ providedIn: 'root' }) export class

    ProductFacade { […] }
32. 32.

    @ManfredSteyer Facade (Application Service) @Injectable({ providedIn: 'root' }) export class

    ProductFacade { public products: Product[] = []; […] } State!
33. 33.

    @ManfredSteyer Facade (Application Service) @Injectable({ providedIn: 'root' }) export class

    ProductFacade { public products: Product[] = []; constructor(private productService: ProductService) { } […] }
34. 34.

    @ManfredSteyer Facade (Application Service) @Injectable({ providedIn: 'root' }) export class

    ProductFacade { public products: Product[] = []; constructor(private productService: ProductService) { } search(category: string): void { […] } }
35. 35.

    @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 :-(
36. 36.

    @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
37. 37.

    @ManfredSteyer App Home Catalog Search RatingFacade ProductFacade SearchFacade Facades Have

    State
38. 38.

    @ManfredSteyer App Home Catalog Search RatingFacade ProductFacade SearchFacade Facades Have

    State
39. 39.

    @ManfredSteyer App Home Catalog Search RatingFacade ProductFacade SearchFacade Facades Have

    State Store (z. B. Redux/ NGRX) Observable Action
40. 40.

    @ManfredSteyer 4) Micro Frontends

41. 41.

    @ManfredSteyer Catalog Ordering Shared Feature Feature Feature Feature Feature …

    … … … … … … … … @ManfredSteyer e-Procurement App Deployment Monolith
42. 42.

    @ManfredSteyer Catalog Ordering Shared Feature Feature Feature Feature Feature …

    … … … … … … … … @ManfredSteyer Catalog App Ordering App Option 1: One App per Domain
43. 43.

    @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
44. 44.

    @ManfredSteyer

45. 45.

    @ManfredSteyer

46. 46.

    @ManfredSteyer ✓ Simple  Loosing State  Load a new

    Application
47. 47.

    @ManfredSteyer µService Providing a (SPA based) Shell µApp µApp µApp

    Shell ▪ iframes ▪ Bootstrapping several SPAs ▪ + Lazy Loading
48. 48.

    @ManfredSteyer Loading MicroApps <script src="micro-app.bundle.js"></script> <micro-app></micro-app>

49. 49.

    @ManfredSteyer DEMO

50. 50.

    @ManfredSteyer BLOG ANGULARarchitects.io

51. 51.

    Summary • Slicing into sub-domains • Slicing into layers •

    Finegrained libraries • Enforce restrictions • Fits to micro frontends
52. 52.

    @ManfredSteyer

53. 53.

    @ManfredSteyer Contact and Downloads [web] ANGULARarchitects.io [twitter] ManfredSteyer d Slides

    & Examples Public: Frankfurt, Munich, Vienna In-House: everywhere http://softwarearchitekt.at/workshops