Config::Model::Backend::PlainFile

NAME

Config::Model::Backend::PlainFile - Read and write config as plain file

VERSION

version 2.152

SYNOPSIS

 use Config::Model;
 my $model = Config::Model->new;
 my $inst = $model->create_config_class(
    name => "WithPlainFile",
    element => [ 
        [qw/source new/] => { qw/type leaf value_type uniline/ },
    ],
    rw_config  => {
      backend => 'plain_file',
      config_dir => '/tmp',
    },
 );
 
 my $inst = $model->instance(root_class_name => 'WithPlainFile' );
 my $root = $inst->config_root ;
 $root->load('source=foo new=yes' );
 $inst->write_back ;

Now "/tmp" directory contains 2 files: "source" and "new" with "foo" and "yes" inside.

DESCRIPTION

This module is used directly by Config::Model to read or write the content of a configuration tree written in several files. Each element of the node is written in a plain file.

Element type and file mapping

Element values are written in one or several files depending on their type.

leaf

The leaf value is written in one file. This file can have several lines if the leaf type is "string"

list

The list content is written in one file. Each line of the file is a value of the list.

hash

Not supported

File mapping

By default, the configuration file is named after the element name (like in synopsis above). The "file" parameter can also be used to specify a file name that take into account the path in the tree using "&index()" and "&element()" functions from Config::Model::Role::ComputeFunction. For instance, with the following model:

    class_name => "Foo",
    element => [
        string_a => { type => 'leaf', value_type => 'string'}
        string_b => { type => 'leaf', value_type => 'string'}
    ],
    rw_config => {
        backend => 'PlainFile',
        config_dir => 'foo',
        file => '&element(-).&element',
        file_mode => 0644,  # optional
    }

If the configuration is loaded with "example string_a=something string_b=else", this backend writes ""something"" in file "example.string_a" and "else" in file "example.string_b". "file_mode" parameter can be used to set the mode of the written file. "file_mode" value can be in any form supported by "chmod" in Path::Tiny.

Methods

read_leaf

Parameters: "(obj, elt, check, file, args)" Called by read method to read the file of a leaf element. "args" contains the arguments passed to read method.

read_hash (obj,elt,check,file,args);

Like read_leaf for hash elements.

read_list

Parameters: "(obj, elt, check, file, args)" Like read_leaf for list elements.

write

"write" writes a file for each element of the calling class. Works only for leaf and list elements. Other element type are skipped. Always return 1 (unless it died before).

AUTHOR

Dominique Dumont, (ddumont at cpan dot org)

SEE ALSO

Config::Model, Config::Model::BackendMgr, Config::Model::Backend::Any,

AUTHOR

Dominique Dumont

COPYRIGHT AND LICENSE

This software is Copyright (c) 2005-2022 by Dominique Dumont. This is free software, licensed under:

  The GNU Lesser General Public License, Version 2.1, February 1999