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refactor: drop publish, publishReplay, and ConnectableObservable #1638

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refactor: drop publish, publishReplay, and ConnectableObservable #1638

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5187d63
refactor: drop `publish`, `publishReplay`, and `ConnectableObservable`
edbzn Nov 6, 2023
967046a
refactor: drop deprecated `tap` overload
edbzn Nov 6, 2023
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5 changes: 1 addition & 4 deletions apps/demos/src/app/features/experiments/state/composition/parent.component.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -26,10 +26,7 @@ export class RxStateParentCompositionComponent implements OnDestroy {
shareReplay(1)
);

constructor(private source: SourceService) {
// this.hotComposition1$ = this.composition1$.pipe(publishReplay(1)) as ConnectableObservable<any>
// this.subscription = this.hotComposition1$.connect();
}
constructor(private source: SourceService) {}

ngOnDestroy(): void {
this.subscription.unsubscribe();
Expand Down
12 changes: 0 additions & 12 deletions ...emos/src/app/features/experiments/state/subscription-less-interaction/parent.component.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -42,18 +42,6 @@ export class RxStateParentSubscriptionLessComponent implements OnDestroy {
});
}

/*
(this.state$ as any).connect();
this.stateSources$.next(this.source1$.pipe(tap(console.log)));

state$ = this.stateSources$.pipe(
map(o => isObservable(o) ? o : of(o)),
mergeAll(),
scan((state: ComponentState, slices: Partial<ComponentState>) => ({...state, ...slices}), {}),
publishReplay(1)
);
*/

ngOnDestroy(): void {
this.subscription.unsubscribe();
}
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47 changes: 29 additions & 18 deletions apps/demos/src/app/rx-angular-pocs/cdk/render-aware/render-aware.ts
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Original file line number Diff line number Diff line change
@@ -1,13 +1,25 @@
import { ChangeDetectorRef } from '@angular/core';
import { RxCustomStrategyCredentials, RxStrategyCredentials, strategyHandling } from '@rx-angular/cdk/render-strategies';
import { ConnectableObservable, EMPTY, isObservable, Observable, of, ReplaySubject, Subject } from 'rxjs';
import {
RxCustomStrategyCredentials,
RxStrategyCredentials,
strategyHandling,
} from '@rx-angular/cdk/render-strategies';
import {
Connectable,
connectable,
EMPTY,
isObservable,
Observable,
of,
ReplaySubject,
Subject,
} from 'rxjs';
import {
catchError,
distinctUntilChanged,
map,
merge as mergeWith,
mergeWith,
mergeAll,
publishReplay,
switchAll,
} from 'rxjs/operators';

Expand Down Expand Up @@ -39,34 +51,33 @@ export function createRenderAware<U>(cfg: {
getCdRef: (k: RxNotification<U>) => ChangeDetectorRef;
getContext: (k?: RxNotification<U>) => any;
}): RenderAware<U | undefined | null> {

const strategyName$ = new ReplaySubject<Observable<string>>(1);
const strategyHandling$ = strategyHandling(
cfg.defaultStrategyName,
cfg.strategies
);
const templateTriggerSubject = new Subject<Observable<RxNotification<U>>>();
const templateTrigger$ = templateTriggerSubject.pipe(
mergeAll()
);
const templateTrigger$ = templateTriggerSubject.pipe(mergeAll());

const observablesFromTemplate$ = new ReplaySubject<Observable<U>>(1);
const renderingEffect$ =
const renderingEffect$ = connectable(
observablesFromTemplate$.pipe(
map(o => isObservable(o) ? o : of(o)),
map((o) => (isObservable(o) ? o : of(o))),
distinctUntilChanged(),
switchAll(),
distinctUntilChanged(),
rxMaterialize(),
mergeWith(templateTrigger$ || EMPTY),
/*observeTemplateByNotificationKind(cfg.templateObserver),
applyStrategy(strategy$, cfg.getContext, cfg.getCdRef),*/
catchError(e => {
catchError((e) => {
console.error(e);
return EMPTY;
}),
publishReplay()
);
})
),
{
connector: () => new ReplaySubject(),
resetOnDisconnect: false,
}
);

return {
strategy$: strategyHandling$.strategy$,
Expand All @@ -80,8 +91,8 @@ export function createRenderAware<U>(cfg: {
templateTriggerSubject.next(trigger$);
},
subscribe: () => {
return (renderingEffect$ as ConnectableObservable<any>).connect();
return (renderingEffect$ as Connectable<any>).connect();
},
rendered$: renderingEffect$ as any
rendered$: renderingEffect$ as any,
};
}
59 changes: 32 additions & 27 deletions apps/demos/src/app/rx-angular-pocs/cdk/utils/rxjs/observable/stateful-observable.ts
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Original file line number Diff line number Diff line change
@@ -1,10 +1,12 @@
import {
BehaviorSubject,
ConnectableObservable,
connectable,
Connectable,
EMPTY,
merge,
Observable,
queueScheduler,
ReplaySubject,
Subject,
Subscribable,
Subscription,
Expand All @@ -14,8 +16,6 @@ import {
distinctUntilChanged,
mergeAll,
observeOn,
publish,
publishReplay,
scan,
tap,
withLatestFrom,
Expand All @@ -41,28 +41,35 @@ export function createAccumulationObservable<T extends object>(
stateSlices = new Subject<Partial<T>>(),
accumulatorObservable = new BehaviorSubject(defaultAccumulator)
): Accumulator<T> {
const signal$ = merge(
stateObservables.pipe(
distinctUntilChanged(),
mergeAll(),
observeOn(queueScheduler)
const signal$ = connectable(
merge(
stateObservables.pipe(
distinctUntilChanged(),
mergeAll(),
observeOn(queueScheduler)
),
stateSlices.pipe(observeOn(queueScheduler))
).pipe(
withLatestFrom(accumulatorObservable.pipe(observeOn(queueScheduler))),
scan(
(state, [slice, stateAccumulator]) => stateAccumulator(state, slice),
{} as T
),
tap({
next: (newState) => (compositionObservable.state = newState),
error: (error) => console.error(error),
}),
catchError((e) => EMPTY)
),
stateSlices.pipe(observeOn(queueScheduler))
).pipe(
withLatestFrom(accumulatorObservable.pipe(observeOn(queueScheduler))),
scan(
(state, [slice, stateAccumulator]) => stateAccumulator(state, slice),
{} as T
),
tap(
(newState) => (compositionObservable.state = newState),
(error) => console.error(error)
),
// @Notice We catch the error here as it get lost in between `publish` and `publishReplay`. We return empty to
catchError((e) => EMPTY),
publish()
{
connector: () => new Subject<T>(),
resetOnDisconnect: false,
}
);
const state$: Observable<T> = signal$.pipe(publishReplay(1));
const state$: Observable<T> = connectable(signal$, {
connector: () => new ReplaySubject<T>(1),
resetOnDisconnect: false,
});
const compositionObservable: Accumulator<T> = {
state: {} as T,
signal$,
Expand Down Expand Up @@ -92,10 +99,8 @@ export function createAccumulationObservable<T extends object>(
}

function subscribe(): Subscription {
const sub = (compositionObservable.signal$ as ConnectableObservable<T>).connect();
sub.add(
(compositionObservable.state$ as ConnectableObservable<T>).connect()
);
const sub = (compositionObservable.signal$ as Connectable<T>).connect();
sub.add((compositionObservable.state$ as Connectable<T>).connect());
sub.add(() => {
accumulatorObservable.complete();
stateObservables.complete();
Expand Down
2 changes: 1 addition & 1 deletion libs/state/effects/src/lib/effects.service.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -74,7 +74,7 @@ export class RxEffects implements OnDestroy, OnDestroy$ {
private static nextId = 0;
readonly _hooks$ = new Subject<DestroyProp>();
private readonly observables$ = new Subject<Observable<unknown>>();
// we have to use publish here to make it hot (composition happens without subscriber)
// we have to use share here to make it hot (composition happens without subscriber)
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is this comment even true?

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no, it's not... https://stackblitz.com/edit/rxjs-nwerqp?file=index.ts

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probably it is meant in a different way

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Why it is not true? share will multicast the stream (hot), so the computation is only made once even if there are multiple subscribers. Here is an example.

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composition happens without subscriber is not true for share, only for connectable after calling the connect method :)

private readonly effects$ = this.observables$.pipe(mergeAll(), share());
private readonly subscription = this.effects$.subscribe();
onDestroy$: Observable<boolean> = this._hooks$.pipe(toHook('destroy'));
Expand Down
61 changes: 32 additions & 29 deletions libs/state/selections/src/lib/accumulation-observable.ts
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Original file line number Diff line number Diff line change
@@ -1,10 +1,12 @@
import {
BehaviorSubject,
ConnectableObservable,
Connectable,
connectable,
EMPTY,
merge,
Observable,
queueScheduler,
ReplaySubject,
Subject,
Subscription,
} from 'rxjs';
Expand All @@ -13,8 +15,6 @@ import {
distinctUntilChanged,
mergeAll,
observeOn,
publish,
publishReplay,
scan,
tap,
withLatestFrom,
Expand All @@ -30,28 +30,35 @@ export function createAccumulationObservable<T extends object>(
stateSlices = new Subject<Partial<T>>(),
accumulatorObservable = new BehaviorSubject(defaultAccumulator)
): Accumulator<T> {
const signal$ = merge(
stateObservables.pipe(
distinctUntilChanged(),
mergeAll(),
observeOn(queueScheduler)
const signal$ = connectable(
merge(
stateObservables.pipe(
distinctUntilChanged(),
mergeAll(),
observeOn(queueScheduler)
),
stateSlices.pipe(observeOn(queueScheduler))
).pipe(
withLatestFrom(accumulatorObservable.pipe(observeOn(queueScheduler))),
scan(
(state, [slice, stateAccumulator]) => stateAccumulator(state, slice),
{} as T
),
tap({
next: (newState) => (compositionObservable.state = newState),
error: (error) => console.error(error),
}),
catchError((e) => EMPTY)
),
stateSlices.pipe(observeOn(queueScheduler))
).pipe(
withLatestFrom(accumulatorObservable.pipe(observeOn(queueScheduler))),
scan(
(state, [slice, stateAccumulator]) => stateAccumulator(state, slice),
{} as T
),
tap(
(newState) => (compositionObservable.state = newState),
(error) => console.error(error)
),
// @Notice We catch the error here as it get lost in between `publish` and `publishReplay`. We return empty to
catchError((e) => EMPTY),
publish()
{
connector: () => new Subject<T>(),
resetOnDisconnect: false,
}
);
const state$: Observable<T> = signal$.pipe(publishReplay(1));
const state$: Observable<T> = connectable(signal$, {
connector: () => new ReplaySubject<T>(1),
resetOnDisconnect: false,
});
const compositionObservable: Accumulator<T> = {
state: {} as T,
signal$,
Expand Down Expand Up @@ -81,12 +88,8 @@ export function createAccumulationObservable<T extends object>(
}

function subscribe(): Subscription {
const sub = (
compositionObservable.signal$ as ConnectableObservable<T>
).connect();
sub.add(
(compositionObservable.state$ as ConnectableObservable<T>).connect()
);
const sub = (compositionObservable.signal$ as Connectable<T>).connect();
sub.add((compositionObservable.state$ as Connectable<T>).connect());
sub.add(() => {
accumulatorObservable.complete();
stateObservables.complete();
Expand Down
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