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1 | |
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2 | package MooseX::Storage; |
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3 | use Moose qw(confess); |
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4 | |
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5 | use MooseX::Storage::Meta::Attribute::DoNotSerialize; |
6 | |
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7 | our $VERSION = '0.18'; |
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8 | our $AUTHORITY = 'cpan:STEVAN'; |
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9 | |
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10 | sub import { |
11 | my $pkg = caller(); |
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12 | |
13 | return if $pkg eq 'main'; |
14 | |
15 | ($pkg->can('meta')) |
16 | || confess "This package can only be used in Moose based classes"; |
17 | |
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18 | $pkg->meta->add_method('Storage' => __PACKAGE__->meta->find_method_by_name('_injected_storage_role_generator')); |
19 | } |
20 | |
21 | sub _injected_storage_role_generator { |
22 | my %params = @_; |
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23 | |
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24 | if (exists $params{'base'}) { |
25 | $params{'base'} = ('Base::' . $params{'base'}); |
26 | } |
27 | else { |
28 | $params{'base'} = 'Basic'; |
29 | } |
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30 | |
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31 | my @roles = ( |
32 | ('MooseX::Storage::' . $params{'base'}), |
33 | ); |
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34 | |
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35 | # NOTE: |
36 | # you don't have to have a format |
37 | # role, this just means you dont |
38 | # get anything other than pack/unpack |
39 | push @roles => 'MooseX::Storage::Format::' . $params{'format'} |
40 | if exists $params{'format'}; |
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41 | |
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42 | # NOTE: |
43 | # many IO roles don't make sense unless |
44 | # you have also have a format role chosen |
45 | # too, the exception being StorableFile |
46 | if (exists $params{'io'}) { |
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47 | # NOTE: |
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48 | # we dont need this code anymore, cause |
49 | # the role composition will catch it for |
50 | # us. This allows the StorableFile to work |
51 | #(exists $params{'format'}) |
52 | # || confess "You must specify a format role in order to use an IO role"; |
53 | push @roles => 'MooseX::Storage::IO::' . $params{'io'}; |
54 | } |
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55 | |
56 | # Note: |
57 | # These traits alter the behaviour of the engine, the user can |
58 | # specify these per role-usage |
59 | for my $trait ( @{ $params{'traits'} ||= [] } ) { |
60 | push @roles, 'MooseX::Storage::Traits::'.$trait; |
61 | } |
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62 | |
63 | for my $role ( @roles ) { |
64 | Class::MOP::load_class($role) or die "Could not load role ($role)"; |
65 | } |
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66 | |
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67 | return @roles; |
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68 | } |
69 | |
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70 | 1; |
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71 | |
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72 | __END__ |
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73 | |
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74 | =pod |
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75 | |
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76 | =head1 NAME |
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77 | |
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78 | MooseX::Storage - A serialization framework for Moose classes |
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79 | |
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80 | =head1 SYNOPSIS |
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81 | |
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82 | package Point; |
83 | use Moose; |
84 | use MooseX::Storage; |
85 | |
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86 | our $VERSION = '0.01'; |
87 | |
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88 | with Storage('format' => 'JSON', 'io' => 'File'); |
89 | |
90 | has 'x' => (is => 'rw', isa => 'Int'); |
91 | has 'y' => (is => 'rw', isa => 'Int'); |
92 | |
93 | 1; |
94 | |
95 | my $p = Point->new(x => 10, y => 10); |
96 | |
97 | ## methods to pack/unpack an |
98 | ## object in perl data structures |
99 | |
100 | # pack the class into a hash |
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101 | $p->pack(); # { __CLASS__ => 'Point-0.01', x => 10, y => 10 } |
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102 | |
103 | # unpack the hash into a class |
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104 | my $p2 = Point->unpack({ __CLASS__ => 'Point-0.01', x => 10, y => 10 }); |
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105 | |
106 | ## methods to freeze/thaw into |
107 | ## a specified serialization format |
108 | ## (in this case JSON) |
109 | |
110 | # pack the class into a JSON string |
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111 | $p->freeze(); # { "__CLASS__" : "Point-0.01", "x" : 10, "y" : 10 } |
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112 | |
113 | # unpack the JSON string into a class |
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114 | my $p2 = Point->thaw('{ "__CLASS__" : "Point-0.01", "x" : 10, "y" : 10 }'); |
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115 | |
116 | ## methods to load/store a class |
117 | ## on the file system |
118 | |
119 | $p->store('my_point.json'); |
120 | |
121 | my $p2 = Point->load('my_point.json'); |
122 | |
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123 | =head1 DESCRIPTION |
124 | |
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125 | MooseX::Storage is a serialization framework for Moose, it provides |
126 | a very flexible and highly pluggable way to serialize Moose classes |
127 | to a number of different formats and styles. |
128 | |
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129 | =head2 Important Note |
130 | |
131 | This is still an early release of this module, so use with caution. |
132 | It's outward facing serialization API should be considered stable, |
133 | but I still reserve the right to make tweaks if I need too. Anything |
134 | beyond the basic pack/unpack, freeze/thaw and load/store should not |
135 | be relied on. |
136 | |
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137 | =head2 Levels of Serialization |
138 | |
139 | There are 3 levels to the serialization, each of which builds upon |
140 | the other and each of which can be customized to the specific needs |
141 | of your class. |
142 | |
143 | =over 4 |
144 | |
145 | =item B<base> |
146 | |
147 | The first (base) level is C<pack> and C<unpack>. In this level the |
148 | class is serialized into a Perl HASH reference, it is tagged with the |
149 | class name and each instance attribute is stored. Very simple. |
150 | |
151 | This level is not optional, it is the bare minumum that |
152 | MooseX::Storage provides and all other levels build on top of this. |
153 | |
154 | =item B<format> |
155 | |
156 | The second (format) level is C<freeze> and C<thaw>. In this level the |
157 | output of C<pack> is sent to C<freeze> or the output of C<thaw> is sent |
158 | to C<unpack>. This levels primary role is to convert to and from the |
159 | specific serialization format and Perl land. |
160 | |
161 | This level is optional, if you don't want/need it, you don't have to |
162 | have it. You can just use C<pack>/C<unpack> instead. |
163 | |
164 | =item B<io> |
165 | |
166 | The third (io) level is C<load> and C<store>. In this level we are reading |
167 | and writing data to file/network/database/etc. |
168 | |
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169 | This level is also optional, in most cases it does require a C<format> role |
170 | to also be used, the expection being the C<StorableFile> role. |
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171 | |
172 | =back |
173 | |
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174 | =head2 Behaviour modifiers |
175 | |
176 | The serialization behaviour can be changed by supplying C<traits>. |
177 | This can be done as follows: |
178 | |
179 | use MooseX::Storage; |
180 | with Storage( traits => [Trait1, Trait2,...] ); |
181 | |
182 | The following traits are currently bundled with C<MooseX::Storage>: |
183 | |
184 | =over 4 |
185 | |
186 | =item OnlyWhenBuilt |
187 | |
188 | Only attributes that have been built (ie, where the predicate returns |
189 | 'true') will be serialized. This avoids any potentially expensive computations. |
190 | |
191 | See L<MooseX::Storage::Traits::OnlyWhenBuilt> for details. |
192 | |
193 | =back |
194 | |
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195 | =head2 How we serialize |
196 | |
197 | There are always limits to any serialization framework, there are just |
198 | some things which are really difficult to serialize properly and some |
199 | things which cannot be serialized at all. |
200 | |
201 | =head2 What can be serialized? |
202 | |
203 | Currently only numbers, string, ARRAY refs, HASH refs and other |
204 | MooseX::Storage enabled objects are supported. |
205 | |
206 | With Array and Hash references the first level down is inspected and |
207 | any objects found are serialized/deserialized for you. We do not do |
208 | this recusively by default, however this feature may become an |
209 | option eventually. |
210 | |
211 | The specific serialize/deserialize routine is determined by the |
212 | Moose type constraint a specific attribute has. In most cases subtypes |
213 | of the supported types are handled correctly, and there is a facility |
214 | for adding handlers for custom types as well. This will get documented |
215 | eventually, but it is currently still in development. |
216 | |
217 | =head2 What can not be serialized? |
218 | |
219 | We do not support CODE references yet, but this support might be added |
220 | in using B::Deparse or some other deep magic. |
221 | |
222 | Scalar refs are not supported, mostly because there is no way to know |
223 | if the value being referenced will be there when the object is inflated. |
224 | I highly doubt will be ever support this in a general sense, but it |
225 | would be possible to add this yourself for a small specific case. |
226 | |
227 | Circular references are specifically disallowed, however if you break |
228 | the cycles yourself then re-assemble them later you can get around this. |
229 | The reason we disallow circular refs is because they are not always supported |
230 | in all formats we use, and they tend to be very tricky to do for all |
231 | possible cases. It is almost always something you want to have tight control |
232 | over anyway. |
233 | |
234 | =head1 CAVEAT |
235 | |
236 | This is B<not> a persistence framework, changes to your object after |
237 | you load or store it will not be reflected in the stored class. |
238 | |
239 | =head1 EXPORTS |
240 | |
241 | =over 4 |
242 | |
243 | =item B<Storage (%options)> |
244 | |
245 | This module will export the C<Storage> method will can be used to |
246 | load a specific set of MooseX::Storage roles to implement a specific |
247 | combination of features. It is meant to make things easier, but it |
248 | is by no means the only way. You can still compose your roles by |
249 | hand if you like. |
250 | |
251 | =back |
252 | |
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253 | =head1 METHODS |
254 | |
255 | =over 4 |
256 | |
257 | =item B<import> |
258 | |
259 | =back |
260 | |
261 | =head2 Introspection |
262 | |
263 | =over 4 |
264 | |
265 | =item B<meta> |
266 | |
267 | =back |
268 | |
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269 | =head1 TODO |
270 | |
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271 | This module needs docs and probably a Cookbook of some kind as well. |
272 | This is an early release, so that is my excuse for now :) |
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273 | |
274 | For the time being, please read the tests and feel free to email me |
275 | if you have any questions. This module can also be discussed on IRC |
276 | in the #moose channel on irc.perl.org. |
277 | |
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278 | =head1 BUGS |
279 | |
280 | All complex software has bugs lurking in it, and this module is no |
281 | exception. If you find a bug please either email me, or add the bug |
282 | to cpan-RT. |
283 | |
284 | =head1 AUTHOR |
285 | |
286 | Chris Prather E<lt>chris.prather@iinteractive.comE<gt> |
287 | |
288 | Stevan Little E<lt>stevan.little@iinteractive.comE<gt> |
289 | |
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290 | Yuval Kogman E<lt>yuval.kogman@iinteractive.comE<gt> |
291 | |
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292 | =head1 COPYRIGHT AND LICENSE |
293 | |
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294 | Copyright 2007-2008 by Infinity Interactive, Inc. |
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295 | |
296 | L<http://www.iinteractive.com> |
297 | |
298 | This library is free software; you can redistribute it and/or modify |
299 | it under the same terms as Perl itself. |
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300 | |
301 | =cut |