Config::Model::Instance - Instance of configuration tree
version 2.060
use Config::Model; use Log::Log4perl qw(:easy); use File::Path ; Log::Log4perl->easy_init($WARN); # setup a dummy popcon conf file my $wr_dir = '/tmp/etc/'; my $conf_file = "$wr_dir/popularity-contest.conf" ; unless (-d $wr_dir) { mkpath($wr_dir, { mode => 0755 }) || die "can't mkpath $wr_dir: $!"; } open(my $conf,"> $conf_file" ) || die "can't open $conf_file: $!"; $conf->print( qq!MY_HOSTID="aaaaaaaaaaaaaaaaaaaa"\n!, qq!PARTICIPATE="yes"\n!, qq!USEHTTP="yes" # always http\n!, qq!DAY="6"\n!); $conf->close ; my $model = Config::Model->new; # PopCon model is provided. Create a new Config::Model::Instance object my $inst = $model->instance (root_class_name => 'PopCon', root_dir => '/tmp', ); my $root = $inst -> config_root ; print $root->describe;
This module provides an object that holds a configuration tree.
An instance object is created by calling instance method on an existing model:
my $inst = $model->instance (root_class_name => 'SomeRootClass', instance_name => 'test1');
The directory (or directories) holding configuration files is specified within the configuration model. For test purpose you can change the "root" directory with root_dir parameter:
root_dir
Pseudo root directory where to read and write configuration files
Specify which backend to use. See "write_back ( ... )" for details
When set, configuration files will not be read when creating configuration tree.
'yes', 'skip' or 'no'
Call back this function whenever notify_change is called. Called with arguments: name => <root node element name>, index => <index_value>
notify_change
name => <root node element name>, index => <index_value>
Returns a list of tree items that currently have an error.
Returns a list of error messages from the tree content.
Note that the root directory specified within the configuration model will be overridden by root_dir parameter.
If you need to load configuration data that are not correct, you can use force_load => 1. Then, wrong data will be discarded (equivalent to check = 'no'> ).
force_load => 1
check =
Returns the instance name.
Returns the root object of the configuration tree.
Returns how to check read files.
Destroy current configuration tree (with data) and returns a new tree with data (and annotations) loaded from disk.
Returns the model (Config::Model object) of the configuration tree.
Returns the object loading and saving annotations. See Config::Model::Annotation for details.
All values stored in preset mode are shown to the user as default values. This feature is useful to enter configuration data entered by an automatic process (like hardware scan)
Stop preset mode
Get preset mode
Clear all preset values stored.
All values stored in layered mode are shown to the user as default values. This feature is useful to enter configuration data entered by an automatic process (like hardware scan)
Stop layered mode
Get layered mode
Clear all layered values stored.
Returns 'normal' or 'preset' or 'layered'. Does not take into account initial_load.
Stop initial_load mode. Instance is built with initial_load as 1. Read backend will clear this value once the first read is done.
Get initial_load mode
The data method provide a way to store some arbitrary data in the instance object.
Load configuration tree with configuration data. See Config::Model::Loader for more details
Returns an object dedicated to search an element in the configuration model (respecting privilege level).
This method returns a Config::Model::Searcher object. See Config::Model::Searcher for details on how to handle a search.
Deprecated. Call "iterator" instead.
This method returns a Config::Model::Iterator object. See Config::Model::Iterator for details.
Arguments are explained in Config::Model::Iterator constructor arguments.
Usually, a program based on config model must first create the configuration model, then load all configuration data.
This feature enables you to declare with the model a way to load configuration data (and to write it back). See Config::Model::BackendMgr for details.
Get the preferred backend method for this instance (as passed to the constructor).
Returns root directory where configuration data is read from or written to.
Register a node path that will be called back with write_back method.
write_back
Notify that some data has changed in the tree.
Try to run all subroutines registered with register_write_back to write the configuration information until one succeeds (returns true). (See Config::Model::BackendMgr for details).
register_write_back
You can specify here a pseudo root directory or another config directory to write configuration data back with root and config_dir parameters. This will override the model specifications.
root
config_dir
You can force to use a backend by specifying backend => xxx. For instance, backend => 'augeas' or backend => 'custom'.
backend => xxx
backend => 'augeas'
backend => 'custom'
You can force to use all backend to write the files by specifying backend => 'all'.
backend => 'all'
write_back will croak if no write call-back are known.
Scan the tree and apply fixes that are attached to warning specifications. See warn_if_match or warn_unless_match in "" in Config::Model::Value.
warn_if_match
warn_unless_match
Returns 1 (or more) if the instance contains data that needs to be saved.
In list context, returns a array ref of strings describing the changes. In scalar context, returns a big string. Useful to print.
Print all changes on STDOUT and return the list of changes.
Returns the number of warning found in the elements of this configuration instance.
Dominique Dumont, (ddumont at cpan dot org)
Config::Model, Config::Model::Node, Config::Model::Loader, Config::Model::Searcher, Config::Model::Value,
Dominique Dumont
This software is Copyright (c) 2014 by Dominique Dumont.
This is free software, licensed under:
The GNU Lesser General Public License, Version 2.1, February 1999
To install Config::Model, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Config::Model
CPAN shell
perl -MCPAN -e shell install Config::Model
For more information on module installation, please visit the detailed CPAN module installation guide.