blob: 3bbeb389b617b8f52f068b55eede694fe095ec92 (
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
46
47
48
49
50
51
52
53
54
55
56
57
58
59
|
// Parts of this module were taken from narwhal:
//
// http://narwhaljs.org
var observers = [];
var unloaders = [];
var when = exports.when = function when(observer) {
if (observers.indexOf(observer) != -1)
return;
observers.unshift(observer);
};
var send = exports.send = function send(reason, onError) {
onError = onError || console.exception;
observers.forEach(function (observer) {
try {
observer(reason);
} catch (e) {
onError(e);
}
});
};
var ensure = exports.ensure = function ensure(obj, destructorName) {
if (!destructorName)
destructorName = "unload";
if (!(destructorName in obj))
throw new Error("object has no '" + destructorName + "' property");
let called = false;
let originalDestructor = obj[destructorName];
function unloadWrapper(reason) {
if (!called) {
called = true;
let index = unloaders.indexOf(unloadWrapper);
if (index == -1)
throw new Error("internal error: unloader not found");
unloaders.splice(index, 1);
originalDestructor.call(obj, reason);
originalDestructor = null;
destructorName = null;
obj = null;
}
};
unloaders.push(unloadWrapper);
obj[destructorName] = unloadWrapper;
};
when(
function(reason) {
unloaders.slice().forEach(
function(unloadWrapper) {
unloadWrapper(reason);
});
});
|
