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
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
|
/**
* Any copyright is dedicated to the Public Domain.
* http://creativecommons.org/publicdomain/zero/1.0/
*/
const Cc = Components.classes;
const Ci = Components.interfaces;
const Cu = Components.utils;
Cu.import("resource://gre/modules/Services.jsm");
Cu.import("resource://gre/modules/XPCOMUtils.jsm");
var gWorkerAndCallback = {
_worker: null,
_callback: null,
_ensureStarted: function() {
if (!this._worker) {
throw new Error("Not yet started!");
}
},
start: function() {
if (!this._worker) {
var worker = new Worker("chrome://worker/content/worker.js");
worker.onerror = function(event) {
Cu.reportError(event.message);
event.preventDefault();
};
this._worker = worker;
}
},
stop: function() {
if (this._worker) {
try {
this.terminate();
}
catch(e) {
Cu.reportError(e);
}
this._worker = null;
}
},
set callback(val) {
this._ensureStarted();
if (val) {
var callback = val.QueryInterface(Ci.nsIWorkerTestCallback);
if (this.callback != callback) {
this._worker.onmessage = function(event) {
callback.onmessage(event.data);
};
this._worker.onerror = function(event) {
callback.onerror(event.message);
event.preventDefault();
};
this._callback = callback;
}
}
else {
this._worker.onmessage = null;
this._worker.onerror = null;
this._callback = null;
}
},
get callback() {
return this._callback;
},
postMessage: function(data) {
this._ensureStarted();
this._worker.postMessage(data);
},
terminate: function() {
this._ensureStarted();
this._worker.terminate();
this.callback = null;
}
};
function WorkerTest() {
}
WorkerTest.prototype = {
observe: function(subject, topic, data) {
switch(topic) {
case "profile-after-change":
gWorkerAndCallback.start();
Services.obs.addObserver(this, "profile-before-change", false);
break;
case "profile-before-change":
gWorkerAndCallback.stop();
break;
default:
Cu.reportError("Unknown topic: " + topic);
}
},
set callback(val) {
gWorkerAndCallback.callback = val;
},
get callback() {
return gWorkerAndCallback.callback;
},
postMessage: function(message) {
gWorkerAndCallback.postMessage(message);
},
terminate: function() {
gWorkerAndCallback.terminate();
},
QueryInterface: XPCOMUtils.generateQI([Ci.nsIObserver, Ci.nsIWorkerTest]),
classID: Components.ID("{3b52b935-551f-4606-ba4c-decc18b67bfd}")
};
this.NSGetFactory = XPCOMUtils.generateNSGetFactory([WorkerTest]);
|
