有没有办法在Dancer和Starman中使用包/全局变量?

时间:2013-11-17 19:49:40

标签: perl dancer starman

在使用Starman运行时,我无法找到在Dancer应用程序中使用包变量(或任何类型)的方法。我想它与Starman的preforking有某种关系,但这应该是一个特征,而不是一个bug。

以下是Dancer app的示例:

package nafig;
use Dancer;

my $a = 0;
$b = 0;
$nafig::c = 0;

any '/' => sub {
    warn join " ", $a++, $b++, $nafig::c++;
};

start;

然后我连续3次调用该应用。首先,我用plack引用服务器运行它,一切都按预期工作:

$ plackup app.pl
HTTP::Server::PSGI: Accepting connections at http://0:5000/
0 0 0 at ... blah-blah-blah
1 1 1 at ... blah-blah-blah
2 2 2 at ... blah-blah-blah

但是当我和Starman做同样的事情时,我会得到以下结果。

$ plackup -s Starman app.pl
2013/11/17-23:33:35 Starman::Server (type Net::Server::PreFork) starting! pid(527)
Resolved [*]:5000 to [::]:5000, IPv6
Not including resolved host [0.0.0.0] IPv4 because it will be handled by [::] IPv6
Binding to TCP port 5000 on host :: with IPv6
Setting gid to "1000 1000 20 24 25 29 30 44 46 108 109 115 121 1000"
Starman: Accepting connections at http://*:5000/
0 0 0 at ... blah-blah-blah
0 0 0 at ... blah-blah-blah
0 0 0 at ... blah-blah-blah

但是,在快速刷新页面时,有时会按预期增加值。我想,在这些情况下,Starman仍然处于同一个分支中。

我很惊讶这个问题以前从未在stackoverflow上被问过。持久性变量对我来说似乎很有用,人们如何在没有它们的情况下跳舞?

提前感谢您的帮助。

1 个答案:

答案 0 :(得分:5)

您需要一个像Cache::Memcached这样的模块,它允许您通过分叉线程存储状态。

类似的东西(未经测试)

use strict;
use warnings;

package nafig; #this should start with a capital letter
use Dancer;
use Cache::Memcached;

my $cache =  new Cache::Memcached {
    'servers' => ['127.0.0.1:11211'],
    'compress_threshold' => 10_000,
};

$cache->set("var1", 0);

any '/' => sub {

    my $value = $cache->get("var1");

    warn join " ", $value++;

    $cache->set("var1", $value);
};

start;

从这里改编http://perl.postbit.com/how-to-use-memcached-with-perl.html