108 lines
3.1 KiB
JavaScript
108 lines
3.1 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.CancellationError = exports.CancellationToken = void 0;
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const events_1 = require("events");
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class CancellationToken extends events_1.EventEmitter {
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get cancelled() {
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return this._cancelled || (this._parent != null && this._parent.cancelled);
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}
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set parent(value) {
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this.removeParentCancelHandler();
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this._parent = value;
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this.parentCancelHandler = () => this.cancel();
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this._parent.onCancel(this.parentCancelHandler);
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}
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// babel cannot compile ... correctly for super calls
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constructor(parent) {
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super();
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this.parentCancelHandler = null;
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this._parent = null;
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this._cancelled = false;
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if (parent != null) {
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this.parent = parent;
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}
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}
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cancel() {
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this._cancelled = true;
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this.emit("cancel");
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}
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onCancel(handler) {
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if (this.cancelled) {
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handler();
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}
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else {
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this.once("cancel", handler);
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}
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}
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createPromise(callback) {
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if (this.cancelled) {
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return Promise.reject(new CancellationError());
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}
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const finallyHandler = () => {
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if (cancelHandler != null) {
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try {
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this.removeListener("cancel", cancelHandler);
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cancelHandler = null;
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}
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catch (ignore) {
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// ignore
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}
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}
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};
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let cancelHandler = null;
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return new Promise((resolve, reject) => {
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let addedCancelHandler = null;
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cancelHandler = () => {
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try {
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if (addedCancelHandler != null) {
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addedCancelHandler();
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addedCancelHandler = null;
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}
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}
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finally {
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reject(new CancellationError());
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}
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};
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if (this.cancelled) {
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cancelHandler();
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return;
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}
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this.onCancel(cancelHandler);
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callback(resolve, reject, (callback) => {
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addedCancelHandler = callback;
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});
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})
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.then(it => {
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finallyHandler();
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return it;
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})
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.catch((e) => {
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finallyHandler();
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throw e;
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});
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}
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removeParentCancelHandler() {
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const parent = this._parent;
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if (parent != null && this.parentCancelHandler != null) {
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parent.removeListener("cancel", this.parentCancelHandler);
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this.parentCancelHandler = null;
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}
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}
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dispose() {
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try {
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this.removeParentCancelHandler();
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}
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finally {
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this.removeAllListeners();
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this._parent = null;
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}
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}
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}
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exports.CancellationToken = CancellationToken;
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class CancellationError extends Error {
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constructor() {
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super("cancelled");
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}
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}
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exports.CancellationError = CancellationError;
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//# sourceMappingURL=CancellationToken.js.map
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