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implab » implabjs-core
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Clone from http://hg.code.sf.net/p/implabjs/core

working on core/Cancellation
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r17:b8fc13e5c702 propose cancellat...
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@@ -1,33 +1,67
1 import { ICancellation } from "./interfaces";
1 import { ICancellation } from "./interfaces";
2 import { argumentNotNull } from "./safe";
2
3
3 export class Cancellation implements ICancellation {
4 export class Cancellation implements ICancellation {
5 private _reason: any;
6 private _cbs: Array<(e) => void>;
7
8 constructor(action: (cancel: (e) => void) => void) {
9 argumentNotNull(action, "action");
10
11 action(this._cancel.bind(this));
12 }
13
4 isSupported(): boolean {
14 isSupported(): boolean {
5 return false;
15 return true;
6 }
16 }
7 throwIfRequested(): void {
17 throwIfRequested(): void {
18 if (this._reason)
19 throw this._reason;
8 }
20 }
9
21
10 isRequested(): boolean {
22 isRequested(): boolean {
11 return false;
23 return !!this._reason;
12 }
24 }
13
25
14 register(_cb: (e:any) => void): void {
26 register(cb: (e: any) => void): void {
27 argumentNotNull(cb, "cb");
15
28
29 if (this._reason) {
30 cb(this._reason);
31 } else {
32 if (!this._cbs)
33 this._cbs = [cb];
34 else
35 this._cbs.push(cb);
36 }
16 }
37 }
17
38
18 static readonly none : Cancellation = {
39 private _cancel(reason) {
40 if (this._reason)
41 return;
42
43 this._reason = (reason = reason || new Error("Operation cancelled"));
44
45
46 if (this._cbs) {
47 this._cbs.forEach(cb => cb(reason));
48 this._cbs = null;
49 }
50 }
51
52 static readonly none: ICancellation = {
19 isSupported(): boolean {
53 isSupported(): boolean {
20 return false;
54 return false;
21 },
55 },
22
56
23 throwIfRequested(): void {
57 throwIfRequested(): void {
24 },
58 },
25
59
26 isRequested(): boolean {
60 isRequested(): boolean {
27 return false;
61 return false;
28 },
62 },
29
63
30 register(_cb: (e:any) => void): void {
64 register(_cb: (e: any) => void): void {
31 }
65 }
32 };
66 };
33 } No newline at end of file
67 }
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