1 | "use strict";
|
2 |
|
3 | Object.defineProperty(exports, "__esModule", {
|
4 | value: true
|
5 | });
|
6 | exports.CancellationError = exports.CancellationToken = void 0;
|
7 |
|
8 | function _events() {
|
9 | const data = require("events");
|
10 |
|
11 | _events = function () {
|
12 | return data;
|
13 | };
|
14 |
|
15 | return data;
|
16 | }
|
17 |
|
18 | class CancellationToken extends _events().EventEmitter {
|
19 |
|
20 | constructor(parent) {
|
21 | super();
|
22 | this.parentCancelHandler = null;
|
23 | this._parent = null;
|
24 | this._cancelled = false;
|
25 |
|
26 | if (parent != null) {
|
27 | this.parent = parent;
|
28 | }
|
29 | }
|
30 |
|
31 | get cancelled() {
|
32 | return this._cancelled || this._parent != null && this._parent.cancelled;
|
33 | }
|
34 |
|
35 | set parent(value) {
|
36 | this.removeParentCancelHandler();
|
37 | this._parent = value;
|
38 |
|
39 | this.parentCancelHandler = () => this.cancel();
|
40 |
|
41 | this._parent.onCancel(this.parentCancelHandler);
|
42 | }
|
43 |
|
44 | cancel() {
|
45 | this._cancelled = true;
|
46 | this.emit("cancel");
|
47 | }
|
48 |
|
49 | onCancel(handler) {
|
50 | if (this.cancelled) {
|
51 | handler();
|
52 | } else {
|
53 | this.once("cancel", handler);
|
54 | }
|
55 | }
|
56 |
|
57 | createPromise(callback) {
|
58 | if (this.cancelled) {
|
59 | return Promise.reject(new CancellationError());
|
60 | }
|
61 |
|
62 | const finallyHandler = () => {
|
63 | if (cancelHandler != null) {
|
64 | try {
|
65 | this.removeListener("cancel", cancelHandler);
|
66 | cancelHandler = null;
|
67 | } catch (ignore) {
|
68 | }
|
69 | }
|
70 | };
|
71 |
|
72 | let cancelHandler = null;
|
73 | return new Promise((resolve, reject) => {
|
74 | let addedCancelHandler = null;
|
75 |
|
76 | cancelHandler = () => {
|
77 | try {
|
78 | if (addedCancelHandler != null) {
|
79 | addedCancelHandler();
|
80 | addedCancelHandler = null;
|
81 | }
|
82 | } finally {
|
83 | reject(new CancellationError());
|
84 | }
|
85 | };
|
86 |
|
87 | if (this.cancelled) {
|
88 | cancelHandler();
|
89 | return;
|
90 | }
|
91 |
|
92 | this.onCancel(cancelHandler);
|
93 | callback(resolve, reject, callback => {
|
94 | addedCancelHandler = callback;
|
95 | });
|
96 | }).then(it => {
|
97 | finallyHandler();
|
98 | return it;
|
99 | }).catch(e => {
|
100 | finallyHandler();
|
101 | throw e;
|
102 | });
|
103 | }
|
104 |
|
105 | removeParentCancelHandler() {
|
106 | const parent = this._parent;
|
107 |
|
108 | if (parent != null && this.parentCancelHandler != null) {
|
109 | parent.removeListener("cancel", this.parentCancelHandler);
|
110 | this.parentCancelHandler = null;
|
111 | }
|
112 | }
|
113 |
|
114 | dispose() {
|
115 | try {
|
116 | this.removeParentCancelHandler();
|
117 | } finally {
|
118 | this.removeAllListeners();
|
119 | this._parent = null;
|
120 | }
|
121 | }
|
122 |
|
123 | }
|
124 |
|
125 | exports.CancellationToken = CancellationToken;
|
126 |
|
127 | class CancellationError extends Error {
|
128 | constructor() {
|
129 | super("Cancelled");
|
130 | }
|
131 |
|
132 | } exports.CancellationError = CancellationError;
|
133 |
|
134 |
|
\ | No newline at end of file |