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* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
*--------------------------------------------------------------------------------------------*/
import { once } from './Functional';
import { Iterator } from '@mappingo/iterator/main/iterator/Iterable';
/**
* Enables logging of potentially leaked disposables.
*
* A disposable is considered leaked if it is not disposed or not registered as the child of
* another disposable. This tracking is very simple an only works for classes that either
* extend Disposable or use a DisposableStore. This means there are a lot of false positives.
*/
const TRACK_DISPOSABLES = false;
let disposableTracker: IDisposableTracker | null = null;
export interface IDisposableTracker {
trackDisposable(x: IDisposable): void;
markTracked(x: IDisposable): void;
}
export function setDisposableTracker(tracker: IDisposableTracker | null): void {
disposableTracker = tracker;
}
Iif (TRACK_DISPOSABLES) {
const __is_disposable_tracked__ = '__is_disposable_tracked__';
disposableTracker = new class implements IDisposableTracker {
trackDisposable(x: IDisposable): void {
const stack = new Error('Potentially leaked disposable').stack!;
setTimeout(() => {
if (!(x as any)[__is_disposable_tracked__]) {
console.log(stack);
}
}, 3000);
}
markTracked(x: IDisposable): void {
if (x && x !== Disposable.None) {
try {
(x as any)[__is_disposable_tracked__] = true;
} catch {
// noop
}
}
}
};
}
function markTracked<T extends IDisposable>(x: T): void {
Eif (!disposableTracker) {
return;
}
disposableTracker.markTracked(x);
}
export function trackDisposable<T extends IDisposable>(x: T): T {
Eif (!disposableTracker) {
return x;
}
disposableTracker.trackDisposable(x);
return x;
}
export class MultiDisposeError extends Error {
constructor(
public readonly errors: any[]
) {
super(`Encountered errors while disposing of store. Errors: [${errors.join(', ')}]`);
}
}
export interface IDisposable {
dispose(): void;
}
export function isDisposable<E extends object>(thing: E): thing is E & IDisposable {
return typeof (<IDisposable>thing).dispose === 'function' && (<IDisposable>thing).dispose.length === 0;
}
export function dispose<T extends IDisposable>(disposable: T): T;
export function dispose<T extends IDisposable>(disposable: T | undefined): T | undefined;
export function dispose<T extends IDisposable, A extends IterableIterator<T> = IterableIterator<T>>(disposables: IterableIterator<T>): A;
export function dispose<T extends IDisposable>(disposables: Array<T>): Array<T>;
export function dispose<T extends IDisposable>(disposables: ReadonlyArray<T>): ReadonlyArray<T>;
export function dispose<T extends IDisposable>(arg: T | IterableIterator<T> | undefined): any {
if (Iterator.is(arg)) {
let errors: any[] = [];
for (const d of arg) {
Eif (d) {
markTracked(d);
try {
d.dispose();
} catch (e) {
errors.push(e);
}
}
}
if (errors.length === 1) {
throw errors[0];
} else if (errors.length > 1) {
throw new MultiDisposeError(errors);
}
return Array.isArray(arg) ? [] : arg;
} else Eif (arg) {
markTracked(arg);
arg.dispose();
return arg;
}
}
export function combinedDisposable(...disposables: IDisposable[]): IDisposable {
disposables.forEach(markTracked);
return toDisposable(() => dispose(disposables));
}
export function toDisposable(fn: () => void): IDisposable {
const self = trackDisposable({
dispose: () => {
markTracked(self);
fn();
}
});
return self;
}
export class DisposableStore implements IDisposable {
static DISABLE_DISPOSED_WARNING = false;
private _toDispose = new Set<IDisposable>();
private _isDisposed = false;
/**
* Dispose of all registered disposables and mark this object as disposed.
*
* Any future disposables added to this object will be disposed of on `add`.
*/
public dispose(): void {
Iif (this._isDisposed) {
return;
}
markTracked(this);
this._isDisposed = true;
this.clear();
}
/**
* Dispose of all registered disposables but do not mark this object as disposed.
*/
public clear(): void {
try {
dispose(this._toDispose.values());
} finally {
this._toDispose.clear();
}
}
public add<T extends IDisposable>(t: T): T {
Iif (!t) {
return t;
}
Iif ((t as unknown as DisposableStore) === this) {
throw new Error('Cannot register a disposable on itself!');
}
markTracked(t);
Iif (this._isDisposed) {
if (!DisposableStore.DISABLE_DISPOSED_WARNING) {
console.warn(new Error('Trying to add a disposable to a DisposableStore that has already been disposed of. The added object will be leaked!').stack);
}
} else {
this._toDispose.add(t);
}
return t;
}
}
export abstract class Disposable implements IDisposable {
static readonly None = Object.freeze<IDisposable>({ dispose() { } });
private readonly _store = new DisposableStore();
constructor() {
trackDisposable(this);
}
public dispose(): void {
markTracked(this);
this._store.dispose();
}
protected _register<T extends IDisposable>(t: T): T {
if ((t as unknown as Disposable) === this) {
throw new Error('Cannot register a disposable on itself!');
}
return this._store.add(t);
}
}
/**
* Manages the lifecycle of a disposable value that may be changed.
*
* This ensures that when the disposable value is changed, the previously held disposable is disposed of. You can
* also register a `MutableDisposable` on a `Disposable` to ensure it is automatically cleaned up.
*/
export class MutableDisposable<T extends IDisposable> implements IDisposable {
private _value?: T;
private _isDisposed = false;
constructor() {
trackDisposable(this);
}
get value(): T | undefined {
return this._isDisposed ? undefined : this._value;
}
set value(value: T | undefined) {
if (this._isDisposed || value === this._value) {
return;
}
this._value?.dispose();
if (value) {
markTracked(value);
}
this._value = value;
}
clear() {
this.value = undefined;
}
dispose(): void {
this._isDisposed = true;
markTracked(this);
this._value?.dispose();
this._value = undefined;
}
}
export interface IReference<T> extends IDisposable {
readonly object: T;
}
export abstract class ReferenceCollection<T> {
private readonly references: Map<string, { readonly object: T; counter: number; }> = new Map();
acquire(key: string, ...args: any[]): IReference<T> {
let reference = this.references.get(key);
if (!reference) {
reference = { counter: 0, object: this.createReferencedObject(key, ...args) };
this.references.set(key, reference);
}
const { object } = reference;
const dispose = once(() => {
if (--reference!.counter === 0) {
this.destroyReferencedObject(key, reference!.object);
this.references.delete(key);
}
});
reference.counter++;
return { object, dispose };
}
protected abstract createReferencedObject(key: string, ...args: any[]): T;
protected abstract destroyReferencedObject(key: string, object: T): void;
}
export class ImmortalReference<T> implements IReference<T> {
constructor(public object: T) { }
dispose(): void { /* noop */ }
}
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