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Manual Reference Pages  -  DANCER::MODULELOADER (3)

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NAME

Dancer::ModuleLoader - dynamic module loading helpers for Dancer core components

CONTENTS

VERSION

version 1.3138

SYNOPSIS

Taken directly from Dancer::Template::TemplateToolkit (which is core):



    die "Template is needed by Dancer::Template::TemplateToolkit"
      unless Dancer::ModuleLoader->load(Template);

    # we now have Template loaded



DESCRIPTION

Sometimes in Dancer core we need to use modules, but we don’t want to declare them all in advance in compile-time. These could be because the specific modules provide extra features which depend on code that isn’t (and shouldn’t) be in core, or perhaps because we only want these components loaded in lazy style, saving loading time a bit. For example, why load Template (which isn’t required by Dancer) when you don’t use Dancer::Template::TemplateToolkit?

To do such things takes a bit of code for localizing $@ and evaling. That code has been refactored into this module to help Dancer core developers.

<B>Please only use this for Dancer core modulesB>. If you’re writing an external Dancer module (Dancer::Template::Tiny, Dancer::Session::Cookie, etc.), please simply "use ModuleYouNeed" in your code and don’t use this module.

METHODS/SUBROUTINES

    load

Runs something like "use ModuleYouNeed" at runtime.



    use Dancer::ModuleLoader;
    ...
    Dancer::ModuleLoader->load(Something)
        or die "Couldnt load Something\n";

    # load version 5.0 or more
    Dancer::ModuleLoader->load(Something, 5.0)
        or die "Couldnt load Something\n";

    # load version 5.0 or more
    my ($res, $error) = Dancer::ModuleLoader->load(Something, 5.0);
    $res or die "Couldnt load Something : $error\n";



Takes in arguments the module name, and optionally the minimum version number required.

In scalar context, returns 1 if successful, 0 if not. In list context, returns 1 if successful, (0, "error message") if not.

If you need to give argument to the loading module, please use the method load_with_params

    require

Runs a "require ModuleYouNeed".



    use Dancer::ModuleLoader;
    ...
    Dancer::ModuleLoader->require(Something)
        or die "Couldnt require Something\n";
    my ($res, $error) = Dancer::ModuleLoader->require(Something);
    $res or die "Couldnt require Something : $error\n";



If you are unsure what you need (require or load), learn the differences between require and use.

Takes in arguments the module name.

In scalar context, returns 1 if successful, 0 if not. In list context, returns 1 if successful, (0, "error message") if not.

    load_with_params

Runs a "use ModuleYouNeed qw(param1 param2 ...)".



    use Dancer::ModuleLoader;
    ...
    Dancer::ModuleLoader->load_with_params(Something, qw(param1 param2) )
        or die "Couldnt load Something with param1 and param2\n";

    my ($res, $error) = Dancer::ModuleLoader->load_with_params(Something, @params);
    $res or die "Couldnt load Something with @params: $error\n";



Takes in arguments the module name, and optionally parameters to pass to the import internal method.

In scalar context, returns 1 if successful, 0 if not. In list context, returns 1 if successful, (0, "error message") if not.

    use_lib

Runs a "use lib qw(path1 path2)" at run time instead of compile time.



    use Dancer::ModuleLoader;
    ...
    Dancer::ModuleLoader->use_lib(path1, @other_paths)
        or die "Couldnt perform use lib\n";

    my ($res, $error) = Dancer::ModuleLoader->use_lib(path1, @other_paths);
    $res or die "Couldnt perform use lib : $error\n";



Takes in arguments a list of path to be prepended to @INC, in a similar way than use lib. However, this is performed at run time, so the list of paths can be generated and dynamic.

In scalar context, returns 1 if successful, 0 if not. In list context, returns 1 if successful, (0, "error message") if not.

    class_from_setting

Given a setting in Dancer::Config, composes the class it should be.

This is the function that translates:



    # in config.yaml
    template: "template_toolkit"



To the class:



    Dancer::Template::TemplateToolkit



Example:



    use Dancer::ModuleLoader;
    my $class = Dancer::ModuleLoader->class_from_setting(
        Dancer::Template => template_toolkit,
    );

    # $class == Dancer::Template::TemplateToolkit

    $class = Dancer::ModuleLoader->class_from_setting(
        Dancer::Template => tiny,
    );

    # class == Dancer::Template::Tiny



SEE ALSO

Module::Load, Module::New::Loader

AUTHOR

Dancer Core Developers

COPYRIGHT AND LICENSE

This software is copyright (c) 2010 by Alexis Sukrieh.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

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perl v5.20.3 DANCER::MODULELOADER (3) 2015-06-12

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