Question

我有一个Moose类，我想用Apache :: Session :: File存储。

但是，默认情况下，Apache :: Session :: File不会存储它，而是收到错误消息：

 (in cleanup) Can't store CODE items at blib\lib\Storable.pm (autosplit into blib\lib\auto\Storable\_freeze.al)...

通过设置

可以避免此问题

$Storable::Deparse = 1;
$Storable::Eval = 1;

以便允许序列化CODE引用。

下面列出了Moose类中的违规方法，该方法从mysql数据库中检索列：

sub _build_cell_generic {
    my ($self,$col) = @_;
    my $sth = $self->call_dbh('prepare','select '.$col.' from '.$self->TABLE.' where CI = ? and LAC = ? and IMPORTDATE = ?');
    $sth->execute($self->CI,$self->LAC,$self->IMPORTDATE);
    my $val = $sth->fetchrow_array;
    $sth->finish;
    return defined $val ? $val : undef;
}

所以推测dbh对象（isa DBIx :: Connector）包含CODE引用。

为了允许这个Moose类的序列化比设置$ Storable :: Deparse和$ Storable :: Eval有更好的选择吗？

以下测试脚本会产生错误：

#!/usr/bin/perl -w

use Apache::Session::File;
use Test::More;
use strict;
use warnings;

require_ok( 'GSM::TestCell' );
require_ok( 'GSM::SQLConnection');

my $db = new_ok('GSM::SQLConnection');
my $cell4 = new_ok( 'GSM::TestCell' => [{LAC => 406, CI => 24491, DB => $db }] );

my %session;
tie %session, 'Apache::Session::File', undef, {Directory =>"./", LockDirectory   => "./" };
print "BCCH is ",$cell4->BCCH,"\n";
$session{$cell4->ID} = $cell4;
done_testing();
__END__

SQL连接类定义为：

package GSM::SQLConnection;
#use DBI;
use Moose;
use DBIx::Connector;

has dbixc => (is => 'ro', isa => 'DBIx::Connector', lazy_build => 1, handles => [ qw(dbh) ]); 

sub _build_dbixc {
    my $self = shift;
    my $dsn = 'DBI:mysql:testDB;host=127.0.0.1;port=3306';
    return DBIx::Connector->new($dsn,'user','pwd');
}

sub call_dbh {
    my $self = shift;
    my $method = shift;
    my @args = @_;
    $self->dbixc->run(fixup => sub { $_->$method(@args) });
}
no Moose;
__PACKAGE__->meta->make_immutable;
1;

TestCell类定义为：

package GSM::TestCell;
use MooseX::NaturalKey;
use strict;
use warnings;

has [qw(LAC CI)] => (is => 'ro', required => 1);
has [qw(ID BCCH IMPORTDATE)] => (is => 'rw', lazy_build => 1);
has 'DB' => (is => 'rw', isa => 'GSM::SQLConnection', required => 1, );
has 'TABLE' => (is => 'rw', default => 'Cell');

primary key =>('LAC','CI');

sub _build_ID {
    my $self = shift;
    return join(',',$self->LAC,$self->CI);
}

sub _build_IMPORTDATE {return '2010-06-21'}

sub _build_BCCH {(shift)->_build_cell_generic('BCCHFrequency');}

sub _build_cell_generic {
    my ($self,$col) = @_;
    my $sth = $self->DB->call_dbh('prepare','select '.$col.' from '.$self->TABLE.' where CI = ? and LAC = ? and IMPORTDATE = ?');
    $sth->execute($self->CI,$self->LAC,$self->IMPORTDATE);
    my $val = $sth->fetchrow_array;
    $sth->finish;
    return defined $val ? $val : undef;
}

no Moose;
__PACKAGE__->meta->make_immutable;
1;

Answer 1

我真的怀疑你真的需要序列化代码引用;你包含的例子没有。您不希望序列化DBIx :: Connector对象，因为它们仅特定于当前运行时实例。

DBIx :: Connector对象中可能包含一个小代码，因为在子代中包装对dbh的访问通常会捕获连接消失的情况（参见'fixup'的讨论）{{ 3}}

Moose对象的序列化由documentation处理，可以轻松扩展。您可以在其中自定义序列化程序以满足您的需求 - 即选择要序列化的属性和要忽略的属性。

Answer 2

Apache :: Session :: File使用的Storable类的文档使用$ Storable :: Deparse和$ Storable :: Eval，但是还继续提出了一个序列化CODE引用和反序列化的方法。一个'安全'的隔间。本页的示例部分给出了一个示例：

http://perldoc.perl.org/Storable.html#CODE-REFERENCES

使用Apache :: Session和CODE引用存储Moose对象的替代方法

2 个答案: