Modern State Management in Angular: 3+n Flavors of the Signal Store @ijs London 2024

Transcript

1. @ManfredSteyer ManfredSteyer Modern State Management in Angular 3+n Flavors of the Signal Store
2. @ManfredSteyer Signal as Producer 4711 Consumer read set notify 4712
3. @ManfredSteyer Signal Eventually Zone-less!
4. @ManfredSteyer flights = signal<Flight[]>([]); const flights = await this.flightService.findAsPromise(from, to); this.flights.set(flights); <div *ngFor="let f of flights()"> <flight-card [item]="f" /> </div>
5. @ManfredSteyer from = signal('Paris'); to = signal('London'); flightRoute = computed(() => this.from() + ' to ' + this.to()); constructor() { effect(() => { console.log('from', this.from()); console.log('to', this.to()); }); }
6. @ManfredSteyer
7. @ManfredSteyer
8. @ManfredSteyer
9. @ManfredSteyer
10. @ManfredSteyer
11. @ManfredSteyer Component Store "Intention" Signals sync/ async computed(…) computed(…)
12. @ManfredSteyer
13. @ManfredSteyer
14. @ManfredSteyer
15. @ManfredSteyer Manfred Steyer
16. @ManfredSteyer
17. @ManfredSteyer @Injectable({ providedIn: 'root' }) export class FlightBookingFacade { private state = signalState({ from: 'Paris', to: 'London', flights: [] as Flight[], basket: {} as Record<number, boolean>, }); readonly flights = this.state.flights; readonly from = this.state.from; […] }
18. @ManfredSteyer @Injectable({ providedIn: 'root' }) export class FlightBookingFacade { […] readonly selected = computed( () => this.flights().filter((f) => this.basket()[f.id]) ); […] }
19. @ManfredSteyer @Injectable({ providedIn: 'root' }) export class FlightBookingFacade { […] updateCriteria(from: string, to: string): void { patchState(this.state, { from, to }) } […] }
20. @ManfredSteyer @Injectable({ providedIn: 'root' }) export class FlightBookingFacade { […] updateCriteria(from: string, to: string): void { patchState(this.state, (state) => ({ from: state.to, to: state.from })); } […] }
21. @ManfredSteyer
22. @ManfredSteyer export const FlightBookingStore = signalStore( { providedIn: 'root' }, […] );
23. @ManfredSteyer export const FlightBookingStore = signalStore( { providedIn: 'root' }, withState({ from: 'Paris', to: 'London', […] }), […] );
24. @ManfredSteyer export const FlightBookingStore = signalStore( { providedIn: 'root' }, withState({ from: 'Paris', to: 'London', […] }), withComputed(([…]) => ({ […] })), withMethods(([…]) => ({ })), withHooks({ […] }) );
25. @ManfredSteyer
26. @ManfredSteyer
27. @ManfredSteyer export const FlightBookingStore = signalStore( […] withMethods((state) => { […] return { connectCriteria: rxMethod<Criteria>((c$) => c$.pipe([…])) }; }), […] );
28. @ManfredSteyer export const FlightBookingStore = signalStore( […] withMethods((state) => { […] return { connectCriteria: rxMethod<Criteria>((c$) => c$.pipe([…])) }; }), […] );
29. @ManfredSteyer export const FlightBookingStore = signalStore( […] withMethods((state) => { […] return { connectCriteria: rxMethod<Criteria>((c$) => c$.pipe( filter(c => c.from.length >= 3 && c.to.length >= 3), debounceTime(300), switchMap((c) => flightService.find(c.from, c.to)), tap(flights => patchState(state, { flights })) )) }; }), […] );
30. @ManfredSteyer export const FlightBookingStore = signalStore( […] withMethods((state) => { […] return { connectCriteria: rxMethod<Criteria>((c$) => c$.pipe( filter(c => c.from.length >= 3 && c.to.length >= 3), debounceTime(300), switchMap((c) => flightService.find(c.from, c.to)), tap(flights => patchState(state, { flights })) )) }; }), […] );
31. @ManfredSteyer export const FlightBookingStore = signalStore( […] withHooks({ onInit({ connectCriteria, criteria }) { connectCriteria(criteria); }, }), ); takes: Signal<T>, Observable<T>, T
32. @ManfredSteyer
33. @ManfredSteyer const BookingStore = signalStore( withEntities<FlightState>() );
34. @ManfredSteyer
35. @ManfredSteyer
36. @ManfredSteyer Michael Egger-Zikes Rainer Hahnekamp Manfred Steyer
37. @ManfredSteyer Free eBook (6th Edition) ANGULARarchitects.io/book 20 Chapters 4 new Signal Store Chapters
38. @ManfredSteyer Signals: Future of CD Take Care of Data Flow Stores are the Missing Link Signal Store Lightweight Highly Extensible
39. @ManfredSteyer
40. @ManfredSteyer d Slides & Examples Remote Company Workshops and Consulting http://angulararchitects.io