src/vs/base/common/observableInternal/utils/utilsCancellation.ts
101 LOC · 60 covered · 41 uncovered · 15 ranges · 6771 concepts · 6 introducers · 3467 tests
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/*---------------------------------------------------------------------------------------------
devToolsLogger.ts ×24
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
*--------------------------------------------------------------------------------------------*/
import { IReader, IObservable } from '../base.js';
import { DebugOwner, DebugNameData } from '../debugName.js';
import { CancellationError, CancellationToken, CancellationTokenSource } from '../commonFacade/cancellation.js';
import { strictEquals } from '../commonFacade/deps.js';
import { autorun } from '../reactions/autorun.js';
import { Derived } from '../observables/derivedImpl.js';
import { DebugLocation } from '../debugLocation.js';
/**
* Resolves the promise when the observables state matches the predicate.
*/
export function waitForState<T>(observable: IObservable<T | null | undefined>): Promise<T>;
export function waitForState<T, TState extends T>(observable: IObservable<T>, predicate: (state: T) => state is TState, isError?: (state: T) => boolean | unknown | undefined, cancellationToken?: CancellationToken): Promise<TState>;
export function waitForState<T>(observable: IObservable<T>, predicate: (state: T) => boolean, isError?: (state: T) => boolean | unknown | undefined, cancellationToken?: CancellationToken): Promise<T>;
export function waitForState<T>(observable: IObservable<T>, predicate?: (state: T) => boolean, isError?: (state: T) => boolean | unknown | undefined, cancellationToken?: CancellationToken): Promise<T> {
predicate = state => state !== null && state !== undefined;
}
let isImmediateRun = true;
let shouldDispose = false;
const stateObs = observable.map(state => {
/** @description waitForState.state */
return {
isFinished: predicate(state),
error: isError ? isError(state) : false,
state
};
});
const d = autorun(reader => {
/** @description waitForState */
const { isFinished, error, state } = stateObs.read(reader);
if (isFinished || error) {
if (isImmediateRun) {
shouldDispose = true;
}
}
});
if (cancellationToken) {
const dc = cancellationToken.onCancellationRequested(() => {
d.dispose();
dc.dispose();
reject(new CancellationError());
});
if (cancellationToken.isCancellationRequested) {
d.dispose();
dc.dispose();
reject(new CancellationError());
return;
}
}
if (shouldDispose) {
}
}
export function derivedWithCancellationToken<T>(computeFn: (reader: IReader, cancellationToken: CancellationToken) => T): IObservable<T>;
export function derivedWithCancellationToken<T>(owner: object, computeFn: (reader: IReader, cancellationToken: CancellationToken) => T): IObservable<T>;
export function derivedWithCancellationToken<T>(computeFnOrOwner: ((reader: IReader, cancellationToken: CancellationToken) => T) | object, computeFnOrUndefined?: ((reader: IReader, cancellationToken: CancellationToken) => T)): IObservable<T> {
let computeFn: (reader: IReader, store: CancellationToken) => T;
let owner: DebugOwner;
if (computeFnOrUndefined === undefined) {
// eslint-disable-next-line local/code-no-any-casts
computeFn = computeFnOrOwner as any;
owner = undefined;
} else {
owner = computeFnOrOwner;
// eslint-disable-next-line local/code-no-any-casts
computeFn = computeFnOrUndefined as any;
}
let cancellationTokenSource: CancellationTokenSource | undefined = undefined;
return new Derived(
new DebugNameData(owner, undefined, computeFn),
r => {
if (cancellationTokenSource) {
cancellationTokenSource.dispose(true);
}
cancellationTokenSource = new CancellationTokenSource();
return computeFn(r, cancellationTokenSource.token);
}, undefined,
() => cancellationTokenSource?.dispose(),
strictEquals,
DebugLocation.ofCaller()
);
}