1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
|
package MooseX::Storage::Deferred;
use Moose::Role;
our $VERSION = '0.31';
our $AUTHORITY = 'cpan:STEVAN';
with 'MooseX::Storage::Basic';
sub __get_method {
my ( $self, $basename, $value, $method_name ) = @_;
my $role = MooseX::Storage->_expand_role($basename => $value)->meta;
my $method = $role->get_method($method_name)->body;
}
sub thaw {
my ( $class, $packed, $type, @args ) = @_;
(exists $type->{format})
|| confess "You must specify a format type to thaw from";
my $code = $class->__get_method(Format => $type->{format} => 'thaw');
$class->$code($packed, @args);
}
sub freeze {
my ( $self, $type, @args ) = @_;
(exists $type->{format})
|| confess "You must specify a format type to freeze into";
my $code = $self->__get_method(Format => $type->{format} => 'freeze');
$self->$code(@args);
}
sub load {
my ( $class, $filename, $type, @args ) = @_;
(exists $type->{io})
|| confess "You must specify an I/O type to load with";
my $code = $class->__get_method(IO => $type->{io} => 'load');
$class->$code($filename, $type, @args);
}
sub store {
my ( $self, $filename, $type, @args ) = @_;
(exists $type->{io})
|| confess "You must specify an I/O type to store with";
my $code = $self->__get_method(IO => $type->{io} => 'store');
$self->$code($filename, $type, @args);
}
no Moose::Role;
1;
__END__
=pod
=head1 NAME
MooseX::Storage::Deferred - A role for undecisive programmers
=head1 SYNOPSIS
package Point;
use Moose;
use MooseX::Storage;
our $VERSION = '0.01';
with 'MooseX::Storage::Deferred';
has 'x' => (is => 'rw', isa => 'Int');
has 'y' => (is => 'rw', isa => 'Int');
1;
my $p = Point->new(x => 10, y => 10);
## methods to freeze/thaw into
## a specified serialization format
## (in this case JSON)
# pack the class into a JSON string
$p->freeze({ format => 'JSON' }); # { "__CLASS__" : "Point", "x" : 10, "y" : 10 }
# pack the class into a JSON string using parameterized JSONpm role
$p->freeze({ format => [ JSONpm => { json_opts => { pretty => 1 } } ] });
# unpack the JSON string into a class
my $p2 = Point->thaw(
'{ "__CLASS__" : "Point", "x" : 10, "y" : 10 }',
{ format => 'JSON' }
);
=head1 DESCRIPTION
This role is designed for those times when you need to
serialize into many different formats or I/O options.
It basically allows you to choose the format and IO
options only when you actually use them (see the
SYNOPSIS for more info)
=head1 SUPPORTED FORMATS
=over 4
=item I<JSON>
=item I<JSONpm>
=item I<YAML>
=item I<Storable>
=back
=head1 SUPPORTED I/O
=over 4
=item I<File>
=item I<AtomicFile>
=back
B<NOTE:> The B<StorableFile> I/O option is not supported,
this is because it does not mix well with options who also
have a C<thaw> and C<freeze> methods like this. It is possible
to probably work around this issue, but I don't currently
have the need for it. If you need this supported, talk to me
and I will see what I can do.
=head1 METHODS
=over 4
=item B<freeze ($type_desc)>
=item B<thaw ($data, $type_desc)>
=item B<load ($filename, $type_desc)>
=item B<store ($filename, $type_desc)>
=back
=head2 Introspection
=over 4
=item B<meta>
=back
=head1 BUGS
All complex software has bugs lurking in it, and this module is no
exception. If you find a bug please either email me, or add the bug
to cpan-RT.
=head1 AUTHOR
Stevan Little E<lt>stevan.little@iinteractive.comE<gt>
=head1 COPYRIGHT AND LICENSE
Copyright 2007-2008 by Infinity Interactive, Inc.
L<http://www.iinteractive.com>
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.
=cut
|
