1Config::Model::BackendTUrsaecrkOCrodnetrr(i3b)uted PerlCDooncfuimge:n:tMaotdieoln::BackendTrackOrder(3)
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NAME

6       Config::Model::BackendTrackOrder - Track read order of elements from
7       configuration
8

VERSION

10       version 2.140
11

SYNOPSIS

13        # inside a backend
14        use Config::Model::BackendTrackOrder;
15
16        has tracker => (
17           is => 'ro',
18           isa => 'Config::Model::BackendTrackOrder',
19           lazy_build => 1,
20        );
21
22        sub _build_tracker {
23           my $self = shift;
24           return Config::Model::BackendTrackOrder->new(
25               backend_obj => $self,
26               node => $self->node,
27           ) ;
28        }
29
30        # register elements to record user order
31        $self->tracker->register_element('foo');
32        $self->tracker->register_element('bar');
33
34        # later, when writing data back
35        foreach my $elt ( $self->tracker->get_ordered_element_names ) {
36             # write data
37        }
38

DESCRIPTION

40       This module is used by backends to record the order of the
41       configuration elements found in user file. Later these elements can be
42       written back in the file using the same order.
43
44       Data are written in canonical order if "canonical" method of the
45       "Config::Model::Instance" in instance returns true.
46

CONSTRUCTOR

48       THe constructor accepts the following parameters:
49
50       backend_obj
51           The backend object holding this tracker (required).
52
53       node
54           The node holding the backend above
55

METHODS

57   register_element
58       Register the element and keep track of the registration order during
59       initial load
60
61       Element registered after initial load (i.e . user modification) are
62       registered using canonical order.
63
64   get_ordered_element_names
65       Returns a list of elements respecting user's order.
66
67       Returns the canonical list if Instance canonical attribute is 1.
68

AUTHOR

70       Dominique Dumont
71

73       This software is Copyright (c) 2005-2020 by Dominique Dumont.
74
75       This is free software, licensed under:
76
77         The GNU Lesser General Public License, Version 2.1, February 1999
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81perl v5.32.0                      2020-08-02Config::Model::BackendTrackOrder(3)
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