90 lines
2.5 KiB
TypeScript
90 lines
2.5 KiB
TypeScript
/*
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Copyright 2020 Bruno Windels <bruno@windels.cloud>
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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export interface IDisposable {
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dispose(): void;
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}
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type Disposable = IDisposable | (() => void);
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function disposeValue(value: Disposable): void {
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if (typeof value === "function") {
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value();
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} else {
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value.dispose();
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}
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}
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function isDisposable(value: Disposable): boolean {
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return value && (typeof value === "function" || typeof value.dispose === "function");
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}
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export class Disposables {
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private _disposables: Disposable[] | null = [];
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track(disposable: Disposable): Disposable {
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if (!isDisposable(disposable)) {
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throw new Error("Not a disposable");
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}
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if (this.isDisposed) {
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console.warn("Disposables already disposed, disposing new value");
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disposeValue(disposable);
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return disposable;
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}
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this._disposables!.push(disposable);
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return disposable;
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}
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untrack(disposable: Disposable): null {
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if (this.isDisposed) {
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console.warn("Disposables already disposed, cannot untrack");
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return null;
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}
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const idx = this._disposables!.indexOf(disposable);
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if (idx >= 0) {
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this._disposables!.splice(idx, 1);
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}
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return null;
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}
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dispose(): void {
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if (this._disposables) {
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for (const d of this._disposables) {
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disposeValue(d);
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}
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this._disposables = null;
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}
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}
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get isDisposed(): boolean {
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return this._disposables === null;
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}
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disposeTracked(value: Disposable): null {
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if (value === undefined || value === null || this.isDisposed) {
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return null;
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}
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const idx = this._disposables!.indexOf(value);
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if (idx !== -1) {
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const [foundValue] = this._disposables!.splice(idx, 1);
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disposeValue(foundValue);
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} else {
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console.warn("disposable not found, did it leak?", value);
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}
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return null;
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}
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}
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