В свете аргумента «названные функции отображаются в стеках» аргументы, современные механизмы JavaScript на самом деле вполне способны представлять анонимные функции.
На момент написания этой статьи V8, SpiderMonkey, Chakra и Nitro всегда обратитесь к названным функциям по их именам. Они почти всегда ссылаются на анонимную функцию по ее идентификатору, если она есть.
SpiderMonkey может определить имя анонимной функции, возвращенной из другой функции. Остальное не может.
Если вы действительно хотите, чтобы ваш итератор и успешные обратные вызовы отображались в трассировке, вы могли бы назвать их тоже ...
[].forEach(function iterator() {});
Но
'use strict';
var a = function () {
throw new Error();
},
b = function b() {
throw new Error();
},
c = function d() {
throw new Error();
},
e = {
f: a,
g: b,
h: c,
i: function () {
throw new Error();
},
j: function j() {
throw new Error();
},
k: function l() {
throw new Error();
}
},
m = (function () {
return function () {
throw new Error();
};
}()),
n = (function () {
return function n() {
throw new Error();
};
}()),
o = (function () {
return function p() {
throw new Error();
};
}());
console.log([a, b, c].concat(Object.keys(e).reduce(function (values, key) {
return values.concat(e[key]);
}, [])).concat([m, n, o]).reduce(function (logs, func) {
try {
func();
} catch (error) {
return logs.concat('func.name: ' + func.name + '\n' +
'Trace:\n' +
error.stack);
// Need to manually log the error object in Nitro.
}
}, []).join('\n\n'));
func.name:
Trace:
Error
at a (http://localhost:8000/test.js:4:11)
at http://localhost:8000/test.js:47:9
at Array.reduce (native)
at http://localhost:8000/test.js:44:27
func.name: b
Trace:
Error
at b (http://localhost:8000/test.js:7:15)
at http://localhost:8000/test.js:47:9
at Array.reduce (native)
at http://localhost:8000/test.js:44:27
func.name: d
Trace:
Error
at d (http://localhost:8000/test.js:10:15)
at http://localhost:8000/test.js:47:9
at Array.reduce (native)
at http://localhost:8000/test.js:44:27
func.name:
Trace:
Error
at a (http://localhost:8000/test.js:4:11)
at http://localhost:8000/test.js:47:9
at Array.reduce (native)
at http://localhost:8000/test.js:44:27
func.name: b
Trace:
Error
at b (http://localhost:8000/test.js:7:15)
at http://localhost:8000/test.js:47:9
at Array.reduce (native)
at http://localhost:8000/test.js:44:27
func.name: d
Trace:
Error
at d (http://localhost:8000/test.js:10:15)
at http://localhost:8000/test.js:47:9
at Array.reduce (native)
at http://localhost:8000/test.js:44:27
func.name:
Trace:
Error
at e.i (http://localhost:8000/test.js:17:19)
at http://localhost:8000/test.js:47:9
at Array.reduce (native)
at http://localhost:8000/test.js:44:27
func.name: j
Trace:
Error
at j (http://localhost:8000/test.js:20:19)
at http://localhost:8000/test.js:47:9
at Array.reduce (native)
at http://localhost:8000/test.js:44:27
func.name: l
Trace:
Error
at l (http://localhost:8000/test.js:23:19)
at http://localhost:8000/test.js:47:9
at Array.reduce (native)
at http://localhost:8000/test.js:44:27
func.name:
Trace:
Error
at http://localhost:8000/test.js:28:19
at http://localhost:8000/test.js:47:9
at Array.reduce (native)
at http://localhost:8000/test.js:44:27
func.name: n
Trace:
Error
at n (http://localhost:8000/test.js:33:19)
at http://localhost:8000/test.js:47:9
at Array.reduce (native)
at http://localhost:8000/test.js:44:27
func.name: p
Trace:
Error
at p (http://localhost:8000/test.js:38:19)
at http://localhost:8000/test.js:47:9
at Array.reduce (native)
at http://localhost:8000/test.js:44:27 test.js:42
func.name:
Trace:
a@http://localhost:8000/test.js:4:5
@http://localhost:8000/test.js:47:9
@http://localhost:8000/test.js:54:1
func.name: b
Trace:
b@http://localhost:8000/test.js:7:9
@http://localhost:8000/test.js:47:9
@http://localhost:8000/test.js:54:1
func.name: d
Trace:
d@http://localhost:8000/test.js:10:9
@http://localhost:8000/test.js:47:9
@http://localhost:8000/test.js:54:1
func.name:
Trace:
a@http://localhost:8000/test.js:4:5
@http://localhost:8000/test.js:47:9
@http://localhost:8000/test.js:54:1
func.name: b
Trace:
b@http://localhost:8000/test.js:7:9
@http://localhost:8000/test.js:47:9
@http://localhost:8000/test.js:54:1
func.name: d
Trace:
d@http://localhost:8000/test.js:10:9
@http://localhost:8000/test.js:47:9
@http://localhost:8000/test.js:54:1
func.name:
Trace:
e.i@http://localhost:8000/test.js:17:13
@http://localhost:8000/test.js:47:9
@http://localhost:8000/test.js:54:1
func.name: j
Trace:
j@http://localhost:8000/test.js:20:13
@http://localhost:8000/test.js:47:9
@http://localhost:8000/test.js:54:1
func.name: l
Trace:
l@http://localhost:8000/test.js:23:13
@http://localhost:8000/test.js:47:9
@http://localhost:8000/test.js:54:1
func.name:
Trace:
m<@http://localhost:8000/test.js:28:13
@http://localhost:8000/test.js:47:9
@http://localhost:8000/test.js:54:1
func.name: n
Trace:
n@http://localhost:8000/test.js:33:13
@http://localhost:8000/test.js:47:9
@http://localhost:8000/test.js:54:1
func.name: p
Trace:
p@http://localhost:8000/test.js:38:13
@http://localhost:8000/test.js:47:9
@http://localhost:8000/test.js:54:1
func.name: undefined
Trace:
Error
at a (http://localhost:8000/test.js:4:5)
at Anonymous function (http://localhost:8000/test.js:47:9)
at Global code (http://localhost:8000/test.js:42:1)
func.name: undefined
Trace:
Error
at b (http://localhost:8000/test.js:7:9)
at Anonymous function (http://localhost:8000/test.js:47:9)
at Global code (http://localhost:8000/test.js:42:1)
func.name: undefined
Trace:
Error
at d (http://localhost:8000/test.js:10:9)
at Anonymous function (http://localhost:8000/test.js:47:9)
at Global code (http://localhost:8000/test.js:42:1)
func.name: undefined
Trace:
Error
at a (http://localhost:8000/test.js:4:5)
at Anonymous function (http://localhost:8000/test.js:47:9)
at Global code (http://localhost:8000/test.js:42:1)
func.name: undefined
Trace:
Error
at b (http://localhost:8000/test.js:7:9)
at Anonymous function (http://localhost:8000/test.js:47:9)
at Global code (http://localhost:8000/test.js:42:1)
func.name: undefined
Trace:
Error
at d (http://localhost:8000/test.js:10:9)
at Anonymous function (http://localhost:8000/test.js:47:9)
at Global code (http://localhost:8000/test.js:42:1)
func.name: undefined
Trace:
Error
at e.i (http://localhost:8000/test.js:17:13)
at Anonymous function (http://localhost:8000/test.js:47:9)
at Global code (http://localhost:8000/test.js:42:1)
func.name: undefined
Trace:
Error
at j (http://localhost:8000/test.js:20:13)
at Anonymous function (http://localhost:8000/test.js:47:9)
at Global code (http://localhost:8000/test.js:42:1)
func.name: undefined
Trace:
Error
at l (http://localhost:8000/test.js:23:13)
at Anonymous function (http://localhost:8000/test.js:47:9)
at Global code (http://localhost:8000/test.js:42:1)
func.name: undefined
Trace:
Error
at Anonymous function (http://localhost:8000/test.js:28:13)
at Anonymous function (http://localhost:8000/test.js:47:9)
at Global code (http://localhost:8000/test.js:42:1)
func.name: undefined
Trace:
Error
at n (http://localhost:8000/test.js:33:13)
at Anonymous function (http://localhost:8000/test.js:47:9)
at Global code (http://localhost:8000/test.js:42:1)
func.name: undefined
Trace:
Error
at p (http://localhost:8000/test.js:38:13)
at Anonymous function (http://localhost:8000/test.js:47:9)
at Global code (http://localhost:8000/test.js:42:1)
func.name:
Trace:
a@http://localhost:8000/test.js:4:22
http://localhost:8000/test.js:47:13
reduce@[native code]
global code@http://localhost:8000/test.js:44:33
func.name: b
Trace:
b@http://localhost:8000/test.js:7:26
http://localhost:8000/test.js:47:13
reduce@[native code]
global code@http://localhost:8000/test.js:44:33
func.name: d
Trace:
d@http://localhost:8000/test.js:10:26
http://localhost:8000/test.js:47:13
reduce@[native code]
global code@http://localhost:8000/test.js:44:33
func.name:
Trace:
a@http://localhost:8000/test.js:4:22
http://localhost:8000/test.js:47:13
reduce@[native code]
global code@http://localhost:8000/test.js:44:33
func.name: b
Trace:
b@http://localhost:8000/test.js:7:26
http://localhost:8000/test.js:47:13
reduce@[native code]
global code@http://localhost:8000/test.js:44:33
func.name: d
Trace:
d@http://localhost:8000/test.js:10:26
http://localhost:8000/test.js:47:13
reduce@[native code]
global code@http://localhost:8000/test.js:44:33
func.name:
Trace:
i@http://localhost:8000/test.js:17:30
http://localhost:8000/test.js:47:13
reduce@[native code]
global code@http://localhost:8000/test.js:44:33
func.name: j
Trace:
j@http://localhost:8000/test.js:20:30
http://localhost:8000/test.js:47:13
reduce@[native code]
global code@http://localhost:8000/test.js:44:33
func.name: l
Trace:
l@http://localhost:8000/test.js:23:30
http://localhost:8000/test.js:47:13
reduce@[native code]
global code@http://localhost:8000/test.js:44:33
func.name:
Trace:
http://localhost:8000/test.js:28:30
http://localhost:8000/test.js:47:13
reduce@[native code]
global code@http://localhost:8000/test.js:44:33
func.name: n
Trace:
n@http://localhost:8000/test.js:33:30
http://localhost:8000/test.js:47:13
reduce@[native code]
global code@http://localhost:8000/test.js:44:33
func.name: p
Trace:
p@http://localhost:8000/test.js:38:30
http://localhost:8000/test.js:47:13
reduce@[native code]
global code@http://localhost:8000/test.js:44:33
Я думаю, что вы переживаете, это сочетание двух проблем. Первый из них заключается в том, что количество одновременных WebRequest
соединений ограничено 2 по умолчанию. Вы можете изменить это, создав класс, полученный из WebClient
, и переопределив метод GetWebRequest
следующим образом:
public class ExtendedWebClient : WebClient
{
/// <summary>
/// Gets or sets the maximum number of concurrent connections (default is 2).
/// </summary>
public int ConnectionLimit { get; set; }
/// <summary>
/// Creates a new instance of ExtendedWebClient.
/// </summary>
public ExtendedWebClient()
{
this.ConnectionLimit = 2;
}
/// <summary>
/// Creates the request for this client and sets connection defaults.
/// </summary>
protected override WebRequest GetWebRequest(Uri address)
{
var request = base.GetWebRequest(address) as HttpWebRequest;
if (request != null)
{
request.ServicePoint.ConnectionLimit = this.ConnectionLimit;
}
return request;
}
}
Вторая проблема, которую я вижу, заключается в том, что вы не закрываете / не располагаете Stream
, когда вы вызываете OpenRead
, так что оказалось бы, что эти два запроса не будут завершены до тех пор, пока сборщик мусора не решит использовать и не использовать эти потоки для вас.