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哪些推荐的 Perl 模块可以序列化 Moose 对象？

发布于 2024-09-28 19:21:51 字数 456 浏览 7 评论 0原文

我通常将 Storable 与 nstore 一起使用，但现在我有一个模块有 CODE ，显然 Storable 不喜欢这样。

我发现 YAML （和 YAML::XS ），我无法真正开始工作）。我还尝试了一些 MooseX::Storage ，但没有取得太大成功。

还有其他选择吗？你会推荐什么？

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时光与爱终年不遇 2024-10-05 19:21:51

设置 $Data 后，您可以使用 Data::Dumper 转储 coderef ::Dumper::Deparse 为真值，但这仅用于调试目的，不适用于序列化。

我建议您回过头来看看为什么 MooseX::Storage 不适合您，因为作者非常努力地为 Moose 对象序列化提供一个充分抽象且强大的解决方案。

更新：看起来您在序列化 _offset_sub 属性时遇到了问题，如这个问题。由于该属性有一个构建器，并且它的构造相当简单（它只是查看另一个属性的当前值），因此您根本不需要序列化它——当您反序列化对象并想要再次使用它时，第一次调用 $this->offset 时将调用构建器。因此，您应该能够将其标记为“不序列化”：

use MooseX::Storage;

has '_offset_sub' => (
    is       => 'ro',
    isa      => 'CodeRef',
    traits   => [ 'DoNotSerialize' ],
    lazy     => 1,
    builder  => '_build_offset_sub',
    init_arg => undef,
);

最后，这有点正交，但您可以折叠 offset 并
使用原生属性“Code”特征将 _offset_sub 属性组合在一起：

has offset => (
    is          => 'bare',
    isa         => 'CodeRef',
    traits      => [ qw(Code DoNotSerialize) ],
    lazy        => 1,
    builder     => '_build_offset',
    init_arg    => undef,
    handles     => {
        offset  => 'execute_method',
    },
);

sub _build_offset {
    my ($self) = @_;

    # same as previous _build_offset_sub...
}

You can dump a coderef with Data::Dumper after setting $Data::Dumper::Deparse to a true value, but this is only intended for debugging purposes, not for serialization.

I would suggest you go back to looking at why MooseX::Storage isn't working out for you, as the authors tried really hard to present a well-abstracted and robust solution for Moose object serialization.

Update: it looks like you are running into issues serializing the _offset_sub attribute, as described in this question. Since that attribute has a builder, and its construction is fairly trivial (it just looks at the current value of another attribute), you shouldn't need to serialize it at all -- when you deserialize your object and want to use it again, the builder will be invoked the first time you call $this->offset. Consequently, you should just be able to mark it as "do not serialize":

use MooseX::Storage;

has '_offset_sub' => (
    is       => 'ro',
    isa      => 'CodeRef',
    traits   => [ 'DoNotSerialize' ],
    lazy     => 1,
    builder  => '_build_offset_sub',
    init_arg => undef,
);

Lastly, this is somewhat orthogonal, but you can fold the offset and
_offset_sub attributes together by using the native attribute 'Code' trait:

has offset => (
    is          => 'bare',
    isa         => 'CodeRef',
    traits      => [ qw(Code DoNotSerialize) ],
    lazy        => 1,
    builder     => '_build_offset',
    init_arg    => undef,
    handles     => {
        offset  => 'execute_method',
    },
);

sub _build_offset {
    my ($self) = @_;

    # same as previous _build_offset_sub...
}

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