@spartacus/core
Version:
Spartacus - the core framework
85 lines • 14.1 kB
JavaScript
import { Injectable } from '@angular/core';
import { BehaviorSubject, EMPTY, iif, isObservable, merge, of, Subscription, using, } from 'rxjs';
import { catchError, distinctUntilChanged, pluck, share, switchMapTo, takeUntil, tap, } from 'rxjs/operators';
import * as i0 from "@angular/core";
import * as i1 from "../../event/event.service";
export class QueryService {
constructor(eventService) {
this.eventService = eventService;
this.subscriptions = new Subscription();
}
create(loaderFactory, options) {
var _a, _b, _c, _d, _e, _f;
const initialState = {
data: undefined,
error: false,
loading: true,
};
const state$ = new BehaviorSubject(initialState);
// if the query will be unsubscribed from while the data is being loaded, we will end up with the loading flag set to true
// we want to retry this load on next subscription
const onSubscribeLoad$ = iif(() => state$.value.loading, of(undefined));
const loadTrigger$ = this.getTriggersStream([
onSubscribeLoad$,
...((_a = options === null || options === void 0 ? void 0 : options.reloadOn) !== null && _a !== void 0 ? _a : []),
...((_b = options === null || options === void 0 ? void 0 : options.resetOn) !== null && _b !== void 0 ? _b : []),
]);
const resetTrigger$ = this.getTriggersStream((_c = options === null || options === void 0 ? void 0 : options.resetOn) !== null && _c !== void 0 ? _c : []);
const reloadTrigger$ = this.getTriggersStream((_d = options === null || options === void 0 ? void 0 : options.reloadOn) !== null && _d !== void 0 ? _d : []);
const load$ = loadTrigger$.pipe(tap(() => {
if (!state$.value.loading) {
state$.next(Object.assign(Object.assign({}, state$.value), { loading: true }));
}
}), switchMapTo(loaderFactory().pipe(takeUntil(resetTrigger$))), tap((data) => {
state$.next({ loading: false, error: false, data });
}), catchError((error, retryStream$) => {
state$.next({ loading: false, error, data: undefined });
return retryStream$;
}), share());
// reload logic
if ((_e = options === null || options === void 0 ? void 0 : options.reloadOn) === null || _e === void 0 ? void 0 : _e.length) {
this.subscriptions.add(reloadTrigger$.subscribe(() => {
if (!state$.value.loading) {
state$.next(Object.assign(Object.assign({}, state$.value), { loading: true }));
}
}));
}
// reset logic
if ((_f = options === null || options === void 0 ? void 0 : options.resetOn) === null || _f === void 0 ? void 0 : _f.length) {
this.subscriptions.add(resetTrigger$.subscribe(() => {
if (state$.value.data !== undefined ||
state$.value.error !== false ||
state$.value.loading !== false) {
state$.next(initialState);
}
}));
}
const query$ = using(() => load$.subscribe(), () => state$);
const data$ = query$.pipe(pluck('data'), distinctUntilChanged());
return { get: () => data$, getState: () => query$ };
}
getTriggersStream(triggers) {
if (!triggers.length) {
return EMPTY;
}
const observables = triggers.map((trigger) => {
if (isObservable(trigger)) {
return trigger;
}
return this.eventService.get(trigger);
});
return merge(...observables);
}
ngOnDestroy() {
this.subscriptions.unsubscribe();
}
}
QueryService.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "12.0.5", ngImport: i0, type: QueryService, deps: [{ token: i1.EventService }], target: i0.ɵɵFactoryTarget.Injectable });
QueryService.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "12.0.5", ngImport: i0, type: QueryService, providedIn: 'root' });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "12.0.5", ngImport: i0, type: QueryService, decorators: [{
type: Injectable,
args: [{
providedIn: 'root',
}]
}], ctorParameters: function () { return [{ type: i1.EventService }]; } });
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{ Injectable, OnDestroy, Type } from '@angular/core';\nimport {\n  BehaviorSubject,\n  EMPTY,\n  iif,\n  isObservable,\n  merge,\n  Observable,\n  of,\n  Subscription,\n  using,\n} from 'rxjs';\nimport {\n  catchError,\n  distinctUntilChanged,\n  pluck,\n  share,\n  switchMapTo,\n  takeUntil,\n  tap,\n} from 'rxjs/operators';\nimport { EventService } from '../../event/event.service';\nimport { CxEvent } from '../../event/cx-event';\n\nexport type QueryNotifier = Observable<unknown> | Type<CxEvent>;\n\nexport interface QueryState<T> {\n  loading: boolean;\n  error: false | Error;\n  data: T | undefined;\n}\n\nexport interface Query<T, P extends unknown[] = []> {\n  get(...params: P): Observable<T | undefined>;\n  getState(...params: P): Observable<QueryState<T>>;\n}\n\n@Injectable({\n  providedIn: 'root',\n})\nexport class QueryService implements OnDestroy {\n  protected subscriptions = new Subscription();\n\n  constructor(protected eventService: EventService) {}\n\n  create<T>(\n    loaderFactory: () => Observable<T>,\n    options?: {\n      reloadOn?: QueryNotifier[];\n      resetOn?: QueryNotifier[];\n    }\n  ): Query<T> {\n    const initialState: QueryState<T> = {\n      data: undefined,\n      error: false,\n      loading: true,\n    };\n\n    const state$ = new BehaviorSubject<QueryState<T>>(initialState);\n\n    // if the query will be unsubscribed from while the data is being loaded, we will end up with the loading flag set to true\n    // we want to retry this load on next subscription\n    const onSubscribeLoad$ = iif(() => state$.value.loading, of(undefined));\n\n    const loadTrigger$ = this.getTriggersStream([\n      onSubscribeLoad$, // we need to evaluate onSubscribeLoad$ before other triggers in order to avoid other triggers changing state$ value\n      ...(options?.reloadOn ?? []),\n      ...(options?.resetOn ?? []),\n    ]);\n\n    const resetTrigger$ = this.getTriggersStream(options?.resetOn ?? []);\n    const reloadTrigger$ = this.getTriggersStream(options?.reloadOn ?? []);\n\n    const load$ = loadTrigger$.pipe(\n      tap(() => {\n        if (!state$.value.loading) {\n          state$.next({ ...state$.value, loading: true });\n        }\n      }),\n      switchMapTo(loaderFactory().pipe(takeUntil(resetTrigger$))),\n      tap((data) => {\n        state$.next({ loading: false, error: false, data });\n      }),\n      catchError((error, retryStream$) => {\n        state$.next({ loading: false, error, data: undefined });\n        return retryStream$;\n      }),\n      share()\n    );\n\n    // reload logic\n    if (options?.reloadOn?.length) {\n      this.subscriptions.add(\n        reloadTrigger$.subscribe(() => {\n          if (!state$.value.loading) {\n            state$.next({ ...state$.value, loading: true });\n          }\n        })\n      );\n    }\n\n    // reset logic\n    if (options?.resetOn?.length) {\n      this.subscriptions.add(\n        resetTrigger$.subscribe(() => {\n          if (\n            state$.value.data !== undefined ||\n            state$.value.error !== false ||\n            state$.value.loading !== false\n          ) {\n            state$.next(initialState);\n          }\n        })\n      );\n    }\n\n    const query$ = using(\n      () => load$.subscribe(),\n      () => state$\n    );\n\n    const data$ = query$.pipe(pluck('data'), distinctUntilChanged());\n\n    return { get: () => data$, getState: () => query$ };\n  }\n\n  protected getTriggersStream(triggers: QueryNotifier[]): Observable<unknown> {\n    if (!triggers.length) {\n      return EMPTY;\n    }\n    const observables = triggers.map((trigger) => {\n      if (isObservable(trigger)) {\n        return trigger;\n      }\n      return this.eventService.get(trigger);\n    });\n    return merge(...observables);\n  }\n\n  ngOnDestroy(): void {\n    this.subscriptions.unsubscribe();\n  }\n}\n"]}