blob: ec3225f0fb702452bef7e15b3a3dd75f48a75175 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
|
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
const {classes: Cc, interfaces: Ci, utils: Cu, results: Cr} = Components;
this.EXPORTED_SYMBOLS = [
"EventEmitter"
];
// Simple event emitter abstraction for storage objects to use.
function EventEmitter () {
this._events = new Map();
}
EventEmitter.prototype = {
on(event, listener) {
if (this._events.has(event)) {
this._events.get(event).add(listener);
} else {
this._events.set(event, new Set([listener]));
}
},
off(event, listener) {
if (!this._events.has(event)) {
return;
}
this._events.get(event).delete(listener);
},
emit(event, ...args) {
if (!this._events.has(event)) {
return;
}
for (let listener of this._events.get(event).values()) {
try {
listener.apply(this, args);
} catch (e) {
Cu.reportError(e);
}
}
},
};
|
