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

Example: https://github.com/manfredsteyer/monorepo_domains.git

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1. @ManfredSteyer Sustainable Architectures with Angular, Monorepos and DDD ManfredSteyer Manfred Steyer SOFTWAREarchitekt.at
2. @ManfredSteyer What do we need for a good architecture ? Experience
3. @ManfredSteyer Domain Driven Design
4. @ManfredSteyer How can create sustainable frontend architectures with ideas from DDD?
5. @ManfredSteyer How can create sustainable frontend architectures with ideas from DDD?
6. @ManfredSteyer Contents 1) Strategic DDD in a Nutshell 2) Angular Monorepos 3) Monorepos & DDD 4) DDD & Micro Frontends
7. @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
8. @ManfredSteyer 1) DDD in a nutshell
9. @ManfredSteyer Domain Driven Design Strategic Design Tactical Design Decomposing a System Design Patterns & Practices
10. @ManfredSteyer Domain Driven Design Strategic Design Tactical Design Decomposing a System Design Patterns & Practices
11. @ManfredSteyer This is what Strategic DDD prevents
12. @ManfredSteyer Example e-Procurement System
13. @ManfredSteyer Catalog Approval Specification Ordering Example Sub-Domains
14. @ManfredSteyer 2) Monorepos
15. @ManfredSteyer Workspace
16. @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
17. @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, …
18. @ManfredSteyer Moving back and forth Npm Registry
19. @ManfredSteyer Tooling & Generator https://nrwl.io/nx
20. @ManfredSteyer Visualize Module Structure
21. @ManfredSteyer Nx Monorepos and Strategic Design
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. @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. @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. @ManfredSteyer Application Domain Infrastructure Isolate your domain! Domain Domain Infrastructure e. g. data access Application Use case specific facades, state management Entities, biz logic
26. @ManfredSteyer Alternatives to layering • e. g. Hexagonal Architecture, Clean Architecture • Anyway: We need to restrict access b/w libraries
27. @ManfredSteyer DEMO
28. @ManfredSteyer Finegrained Libraries • Unit of recompilation • Unit of retesting • Access restrictions • Prevent Cycles • Information Hiding • Future replacement for NgModules?
29. @ManfredSteyer Bonus: Facades and State Management
30. @ManfredSteyer Facade (Application Service) @Injectable({ providedIn: 'root' }) export class ProductFacade { […] }
31. @ManfredSteyer Facade (Application Service) @Injectable({ providedIn: 'root' }) export class ProductFacade { public products: Product[] = []; […] } State!
32. @ManfredSteyer Facade (Application Service) @Injectable({ providedIn: 'root' }) export class ProductFacade { public products: Product[] = []; constructor(private productService: ProductService) { } […] }
33. @ManfredSteyer Facade (Application Service) @Injectable({ providedIn: 'root' }) export class ProductsFacade { public products: Product[] = []; constructor(private productService: ProductService) { } search(category: string): void { […] } }
34. @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 :-(
35. @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
36. @ManfredSteyer App Home Catalog Search RatingFacade ProductFacade SearchFacade Facades Have State
37. @ManfredSteyer App Home Catalog Search RatingFacade ProductFacade SearchFacade Facades Have State
38. @ManfredSteyer App Home Catalog Search RatingFacade ProductFacade SearchFacade Facades Have State Store (z. B. Redux/ NGRX) Observable Action
39. @ManfredSteyer 4) DDD and Micro Frontends? Short outlook
40. @ManfredSteyer Catalog Ordering Shared Feature Feature Feature Feature Feature … … … … … … … … … @ManfredSteyer e-Procurement App Deployment Monolith
41. @ManfredSteyer Catalog Ordering Shared Feature Feature Feature Feature Feature … … … … … … … … … @ManfredSteyer Catalog App Ordering App Option 1: One App per Domain
42. @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
43. @ManfredSteyer Summary Slicing into sub-domains Slicing into layers Relaxed layering Finegrained libraries Enforce restrictions Fits to micro frontends
44. @ManfredSteyer
45. @ManfredSteyer Contact and Downloads [mail] manfred.steyer@SOFTWAREarchitekt.at [web] SOFTWAREarchitekt.at [twitter] ManfredSteyer d Slides & Examples Public: Frankfurt, Munich, Vienna In-House: everywhere http://softwarearchitekt.at/workshops