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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,82 @@ | ||
| // Copyright (c) Microsoft Corporation. | ||
| // Licensed under the MIT License. | ||
|
|
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| import { Event, CancellationToken, Disposable } from 'vscode'; | ||
|
|
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| export interface IWaitUntil { | ||
| token: CancellationToken; | ||
| waitUntil(thenable: Promise<unknown>): void; | ||
| } | ||
| export type IWaitUntilData<T> = Omit<Omit<T, 'waitUntil'>, 'token'>; | ||
|
|
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| // Based on AsyncEmitter in https://github.com/microsoft/vscode/blob/88e6face01795b161523824ba075444fad55466a/src/vs/base/common/event.ts#L1303 | ||
| export class AsyncEmitter<T extends IWaitUntil> { | ||
| private _listeners: Set<(e: T) => unknown> = new Set(); | ||
| private _asyncDeliveryQueue?: Array<[(ev: T) => void, IWaitUntilData<T>]>; | ||
| private _event: Event<T> | undefined; | ||
|
|
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| public get event(): Event<T> { | ||
| if (!this._event) { | ||
| this._event = (listener: (e: T) => unknown): Disposable => { | ||
| this._listeners.add(listener); | ||
| return { | ||
| dispose: () => this._listeners.delete(listener) | ||
| }; | ||
| }; | ||
| } | ||
| return this._event; | ||
| } | ||
|
|
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| async fireAsync(data: IWaitUntilData<T>, token: CancellationToken): Promise<void> { | ||
| if (!this._listeners) { | ||
| return; | ||
| } | ||
|
|
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| if (!this._asyncDeliveryQueue) { | ||
| this._asyncDeliveryQueue = []; | ||
| } | ||
|
|
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| for (const listener of this._listeners) { | ||
| this._asyncDeliveryQueue!.push([listener, data]); | ||
| } | ||
|
|
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| while (this._asyncDeliveryQueue.length > 0 && !token.isCancellationRequested) { | ||
| const [listener, data] = this._asyncDeliveryQueue.shift()!; | ||
| const thenables: Promise<unknown>[] = []; | ||
|
|
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| const event = <T>{ | ||
| ...data, | ||
| token, | ||
| waitUntil: (p: Promise<unknown>): void => { | ||
| if (Object.isFrozen(thenables)) { | ||
| throw new Error('waitUntil can NOT be called asynchronous'); | ||
| } | ||
| thenables.push(p); | ||
| } | ||
| }; | ||
|
|
||
| try { | ||
| listener(event); | ||
| } catch (e) { | ||
| console.error(e); | ||
| continue; | ||
| } | ||
|
|
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| // freeze thenables-collection to enforce sync-calls to | ||
| // wait until and then wait for all thenables to resolve | ||
| Object.freeze(thenables); | ||
|
|
||
| await Promise.allSettled(thenables).then((values) => { | ||
| for (const value of values) { | ||
| if (value.status === 'rejected') { | ||
| console.error(value.reason); | ||
| } | ||
| } | ||
| }); | ||
| } | ||
| } | ||
|
|
||
| dispose(): void { | ||
| this._listeners.clear(); | ||
| } | ||
| } |
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