Commit | Line | Data |
963a69a5 |
1 | package Class::Accessor::Grouped; |
2 | use strict; |
3 | use warnings; |
a0bce8bc |
4 | use Carp (); |
a0bce8bc |
5 | use Scalar::Util (); |
6d0e8ff2 |
6 | use Module::Runtime (); |
df845078 |
7 | |
8 | BEGIN { |
6d0e8ff2 |
9 | # use M::R to work around the 5.8 require bugs |
df845078 |
10 | if ($] < 5.009_005) { |
6d0e8ff2 |
11 | Module::Runtime::require_module('MRO::Compat'); |
df845078 |
12 | } |
13 | else { |
14 | require mro; |
15 | } |
16 | } |
331e820d |
17 | |
ad0ed975 |
18 | our $VERSION = '0.10006'; |
d93670a5 |
19 | $VERSION = eval $VERSION if $VERSION =~ /_/; # numify for warning-free dev releases |
963a69a5 |
20 | |
80ebe3b6 |
21 | # when changing minimum version don't forget to adjust Makefile.PL as well |
85ccab9a |
22 | our $__minimum_xsa_version; |
80ebe3b6 |
23 | BEGIN { $__minimum_xsa_version = '1.13' } |
9f562456 |
24 | |
8019c4d8 |
25 | our $USE_XS; |
26 | # the unless defined is here so that we can override the value |
27 | # before require/use, *regardless* of the state of $ENV{CAG_USE_XS} |
28 | $USE_XS = $ENV{CAG_USE_XS} |
ba8c183b |
29 | unless defined $USE_XS; |
af169484 |
30 | |
6d0e8ff2 |
31 | BEGIN { |
32 | package __CAG_ENV__; |
33 | |
34 | die "Huh?! No minimum C::XSA version?!\n" |
35 | unless $__minimum_xsa_version; |
36 | |
37 | local $@; |
38 | require constant; |
39 | |
40 | # individual (one const at a time) imports so we are 5.6.2 compatible |
41 | # if we can - why not ;) |
42 | constant->import( NO_SUBNAME => eval { |
43 | Module::Runtime::require_module('Sub::Name') |
44 | } ? 0 : "$@" ); |
45 | |
46 | constant->import( NO_CXSA => ( !NO_SUBNAME() and eval { |
47 | Module::Runtime::use_module('Class::XSAccessor' => $__minimum_xsa_version) |
48 | } ) ? 0 : "$@" ); |
49 | |
50 | constant->import( BROKEN_GOTO => ($] < '5.008009') ? 1 : 0 ); |
51 | |
52 | constant->import( UNSTABLE_DOLLARAT => ($] < '5.013002') ? 1 : 0 ); |
53 | |
54 | constant->import( TRACK_UNDEFER_FAIL => ( |
55 | $INC{'Test/Builder.pm'} || $INC{'Test/Builder2.pm'} |
56 | and |
57 | $0 =~ m|^ x?t / .+ \.t $|x |
58 | ) ? 1 : 0 ); |
59 | } |
60 | |
8079caeb |
61 | # Yes this method is undocumented |
85ccab9a |
62 | # Yes it should be a private coderef like all the rest at the end of this file |
8079caeb |
63 | # No we can't do that (yet) because the DBIC-CDBI compat layer overrides it |
64 | # %$*@!?&!&#*$!!! |
65 | sub _mk_group_accessors { |
ba8c183b |
66 | my($self, $maker, $group, @fields) = @_; |
48dfec72 |
67 | my $class = length (ref ($self) ) ? ref ($self) : $self; |
eece2562 |
68 | |
ba8c183b |
69 | no strict 'refs'; |
70 | no warnings 'redefine'; |
eece2562 |
71 | |
ba8c183b |
72 | # So we don't have to do lots of lookups inside the loop. |
73 | $maker = $self->can($maker) unless ref $maker; |
eece2562 |
74 | |
ba8c183b |
75 | for (@fields) { |
eece2562 |
76 | |
ba8c183b |
77 | my ($name, $field) = (ref $_) ? (@$_) : ($_, $_); |
eece2562 |
78 | |
33fe2299 |
79 | for (qw/DESTROY AUTOLOAD CLONE/) { |
80 | Carp::carp("Having a data accessor named '$name' in '$class' is unwise.") |
81 | if $name eq $_; |
82 | } |
83 | |
ba8c183b |
84 | my $alias = "_${name}_accessor"; |
eece2562 |
85 | |
48dfec72 |
86 | for ($name, $alias) { |
eece2562 |
87 | |
ba8c183b |
88 | # the maker may elect to not return anything, meaning it already |
89 | # installed the coderef for us (e.g. lack of Sub::Name) |
48dfec72 |
90 | my $cref = $self->$maker($group, $field, $_) |
ba8c183b |
91 | or next; |
eece2562 |
92 | |
48dfec72 |
93 | my $fq_meth = "${class}::$_"; |
eece2562 |
94 | |
ba8c183b |
95 | *$fq_meth = Sub::Name::subname($fq_meth, $cref); |
96 | #unless defined &{$class."\:\:$field"} |
eece2562 |
97 | } |
ba8c183b |
98 | } |
eece2562 |
99 | }; |
100 | |
85ccab9a |
101 | # coderef is setup at the end for clarity |
102 | my $gen_accessor; |
eece2562 |
103 | |
963a69a5 |
104 | =head1 NAME |
105 | |
1ad8d8c6 |
106 | Class::Accessor::Grouped - Lets you build groups of accessors |
963a69a5 |
107 | |
108 | =head1 SYNOPSIS |
109 | |
3b118c10 |
110 | use base 'Class::Accessor::Grouped'; |
111 | |
112 | # make basic accessors for objects |
113 | __PACKAGE__->mk_group_accessors(simple => qw(id name email)); |
114 | |
115 | # make accessor that works for objects and classes |
116 | __PACKAGE__->mk_group_accessors(inherited => 'awesome_level'); |
117 | |
963a69a5 |
118 | =head1 DESCRIPTION |
119 | |
120 | This class lets you build groups of accessors that will call different |
121 | getters and setters. |
122 | |
123 | =head1 METHODS |
124 | |
125 | =head2 mk_group_accessors |
126 | |
8e0a387b |
127 | __PACKAGE__->mk_group_accessors(simple => 'hair_length', [ hair_color => 'hc' ]); |
18922520 |
128 | |
963a69a5 |
129 | =over 4 |
130 | |
131 | =item Arguments: $group, @fieldspec |
132 | |
133 | Returns: none |
134 | |
135 | =back |
136 | |
137 | Creates a set of accessors in a given group. |
138 | |
139 | $group is the name of the accessor group for the generated accessors; they |
140 | will call get_$group($field) on get and set_$group($field, $value) on set. |
141 | |
22fa6720 |
142 | If you want to mimic Class::Accessor's mk_accessors $group has to be 'simple' |
143 | to tell Class::Accessor::Grouped to use its own get_simple and set_simple |
144 | methods. |
145 | |
963a69a5 |
146 | @fieldspec is a list of field/accessor names; if a fieldspec is a scalar |
147 | this is used as both field and accessor name, if a listref it is expected to |
148 | be of the form [ $accessor, $field ]. |
149 | |
150 | =cut |
151 | |
152 | sub mk_group_accessors { |
ba8c183b |
153 | my ($self, $group, @fields) = @_; |
963a69a5 |
154 | |
ba8c183b |
155 | $self->_mk_group_accessors('make_group_accessor', $group, @fields); |
156 | return; |
963a69a5 |
157 | } |
158 | |
963a69a5 |
159 | =head2 mk_group_ro_accessors |
160 | |
8e0a387b |
161 | __PACKAGE__->mk_group_ro_accessors(simple => 'birthdate', [ social_security_number => 'ssn' ]); |
18922520 |
162 | |
963a69a5 |
163 | =over 4 |
164 | |
165 | =item Arguments: $group, @fieldspec |
166 | |
167 | Returns: none |
168 | |
169 | =back |
170 | |
171 | Creates a set of read only accessors in a given group. Identical to |
a557f8ad |
172 | L</mk_group_accessors> but accessors will throw an error if passed a value |
963a69a5 |
173 | rather than setting the value. |
174 | |
175 | =cut |
176 | |
177 | sub mk_group_ro_accessors { |
ba8c183b |
178 | my($self, $group, @fields) = @_; |
963a69a5 |
179 | |
ba8c183b |
180 | $self->_mk_group_accessors('make_group_ro_accessor', $group, @fields); |
fa4699e4 |
181 | return; |
963a69a5 |
182 | } |
183 | |
184 | =head2 mk_group_wo_accessors |
185 | |
8e0a387b |
186 | __PACKAGE__->mk_group_wo_accessors(simple => 'lie', [ subject => 'subj' ]); |
18922520 |
187 | |
963a69a5 |
188 | =over 4 |
189 | |
190 | =item Arguments: $group, @fieldspec |
191 | |
192 | Returns: none |
193 | |
194 | =back |
195 | |
196 | Creates a set of write only accessors in a given group. Identical to |
a557f8ad |
197 | L</mk_group_accessors> but accessors will throw an error if not passed a |
963a69a5 |
198 | value rather than getting the value. |
199 | |
200 | =cut |
201 | |
202 | sub mk_group_wo_accessors { |
ba8c183b |
203 | my($self, $group, @fields) = @_; |
963a69a5 |
204 | |
ba8c183b |
205 | $self->_mk_group_accessors('make_group_wo_accessor', $group, @fields); |
fa4699e4 |
206 | return; |
963a69a5 |
207 | } |
208 | |
963a69a5 |
209 | =head2 get_simple |
210 | |
211 | =over 4 |
212 | |
213 | =item Arguments: $field |
214 | |
215 | Returns: $value |
216 | |
217 | =back |
218 | |
219 | Simple getter for hash-based objects which returns the value for the field |
220 | name passed as an argument. |
221 | |
222 | =cut |
223 | |
224 | sub get_simple { |
cf8d4321 |
225 | $_[0]->{$_[1]}; |
963a69a5 |
226 | } |
227 | |
228 | =head2 set_simple |
229 | |
230 | =over 4 |
231 | |
232 | =item Arguments: $field, $new_value |
233 | |
234 | Returns: $new_value |
235 | |
236 | =back |
237 | |
238 | Simple setter for hash-based objects which sets and then returns the value |
239 | for the field name passed as an argument. |
240 | |
241 | =cut |
242 | |
243 | sub set_simple { |
cf8d4321 |
244 | $_[0]->{$_[1]} = $_[2]; |
963a69a5 |
245 | } |
246 | |
e6f2a0fd |
247 | |
248 | =head2 get_inherited |
249 | |
250 | =over 4 |
251 | |
252 | =item Arguments: $field |
253 | |
254 | Returns: $value |
255 | |
256 | =back |
257 | |
331e820d |
258 | Simple getter for Classes and hash-based objects which returns the value for |
259 | the field name passed as an argument. This behaves much like |
260 | L<Class::Data::Accessor> where the field can be set in a base class, |
261 | inherited and changed in subclasses, and inherited and changed for object |
262 | instances. |
e6f2a0fd |
263 | |
264 | =cut |
265 | |
266 | sub get_inherited { |
48dfec72 |
267 | if ( length (ref ($_[0]) ) ) { |
ba8c183b |
268 | if (Scalar::Util::reftype $_[0] eq 'HASH') { |
269 | return $_[0]->{$_[1]} if exists $_[0]->{$_[1]}; |
48dfec72 |
270 | # everything in @_ is aliased, an assignment won't work |
271 | splice @_, 0, 1, ref($_[0]); |
62cf9924 |
272 | } |
273 | else { |
ba8c183b |
274 | Carp::croak('Cannot get inherited value on an object instance that is not hash-based'); |
62cf9924 |
275 | } |
ba8c183b |
276 | } |
e6f2a0fd |
277 | |
48dfec72 |
278 | # if we got this far there is nothing in the instance |
279 | # OR this is a class call |
280 | # in any case $_[0] contains the class name (see splice above) |
ba8c183b |
281 | no strict 'refs'; |
282 | no warnings 'uninitialized'; |
62cf9924 |
283 | |
ba8c183b |
284 | my $cag_slot = '::__cag_'. $_[1]; |
48dfec72 |
285 | return ${$_[0].$cag_slot} if defined(${$_[0].$cag_slot}); |
e6f2a0fd |
286 | |
a3a81175 |
287 | do { return ${$_.$cag_slot} if defined(${$_.$cag_slot}) } |
288 | for $_[0]->get_super_paths; |
c46050d3 |
289 | |
ba8c183b |
290 | return undef; |
e6f2a0fd |
291 | } |
292 | |
293 | =head2 set_inherited |
294 | |
295 | =over 4 |
296 | |
297 | =item Arguments: $field, $new_value |
298 | |
299 | Returns: $new_value |
300 | |
301 | =back |
302 | |
331e820d |
303 | Simple setter for Classes and hash-based objects which sets and then returns |
304 | the value for the field name passed as an argument. When called on a hash-based |
305 | object it will set the appropriate hash key value. When called on a class, it |
306 | will set a class level variable. |
e6f2a0fd |
307 | |
331e820d |
308 | B<Note:>: This method will die if you try to set an object variable on a non |
309 | hash-based object. |
e6f2a0fd |
310 | |
311 | =cut |
312 | |
313 | sub set_inherited { |
48dfec72 |
314 | if (length (ref ($_[0]) ) ) { |
ba8c183b |
315 | if (Scalar::Util::reftype $_[0] eq 'HASH') { |
316 | return $_[0]->{$_[1]} = $_[2]; |
e6f2a0fd |
317 | } else { |
ba8c183b |
318 | Carp::croak('Cannot set inherited value on an object instance that is not hash-based'); |
e6f2a0fd |
319 | }; |
cf8d4321 |
320 | } |
ba8c183b |
321 | |
cf8d4321 |
322 | no strict 'refs'; |
323 | ${$_[0].'::__cag_'.$_[1]} = $_[2]; |
e6f2a0fd |
324 | } |
325 | |
331e820d |
326 | =head2 get_component_class |
327 | |
328 | =over 4 |
329 | |
330 | =item Arguments: $field |
331 | |
332 | Returns: $value |
333 | |
334 | =back |
335 | |
336 | Gets the value of the specified component class. |
337 | |
ba8c183b |
338 | __PACKAGE__->mk_group_accessors('component_class' => 'result_class'); |
97d76fb4 |
339 | |
ba8c183b |
340 | $self->result_class->method(); |
97d76fb4 |
341 | |
ba8c183b |
342 | ## same as |
343 | $self->get_component_class('result_class')->method(); |
331e820d |
344 | |
345 | =cut |
346 | |
347 | sub get_component_class { |
cf8d4321 |
348 | $_[0]->get_inherited($_[1]); |
331e820d |
349 | }; |
350 | |
351 | =head2 set_component_class |
352 | |
353 | =over 4 |
354 | |
355 | =item Arguments: $field, $class |
356 | |
357 | Returns: $new_value |
358 | |
359 | =back |
360 | |
361 | Inherited accessor that automatically loads the specified class before setting |
362 | it. This method will die if the specified class could not be loaded. |
363 | |
ba8c183b |
364 | __PACKAGE__->mk_group_accessors('component_class' => 'result_class'); |
365 | __PACKAGE__->result_class('MyClass'); |
97d76fb4 |
366 | |
ba8c183b |
367 | $self->result_class->method(); |
331e820d |
368 | |
369 | =cut |
370 | |
371 | sub set_component_class { |
6d0e8ff2 |
372 | if (defined $_[2] and length $_[2]) { |
373 | # disable warnings, and prevent $_ being eaten away by a behind-the-scenes |
374 | # module loading |
375 | local ($^W, $_); |
376 | |
377 | if (__CAG_ENV__::UNSTABLE_DOLLARAT) { |
378 | my $err; |
379 | { |
380 | local $@; |
381 | eval { Module::Runtime::use_package_optimistically($_[2]) } |
382 | or $err = $@; |
383 | } |
384 | Carp::croak("Could not load $_[1] '$_[2]': $err") if defined $err; |
ba8c183b |
385 | |
6d0e8ff2 |
386 | } |
387 | else { |
388 | eval { Module::Runtime::use_package_optimistically($_[2]) } |
389 | or Carp::croak("Could not load $_[1] '$_[2]': $@"); |
390 | } |
ba8c183b |
391 | }; |
331e820d |
392 | |
cf8d4321 |
393 | $_[0]->set_inherited($_[1], $_[2]); |
331e820d |
394 | }; |
395 | |
8e0a387b |
396 | =head1 INTERNAL METHODS |
397 | |
398 | These methods are documented for clarity, but are never meant to be called |
399 | directly, and are not really meant for overriding either. |
400 | |
a49c32d9 |
401 | =head2 get_super_paths |
402 | |
8e0a387b |
403 | Returns a list of 'parent' or 'super' class names that the current class |
404 | inherited from. This is what drives the traversal done by L</get_inherited>. |
a49c32d9 |
405 | |
406 | =cut |
407 | |
408 | sub get_super_paths { |
cc8ab1f2 |
409 | # get_linear_isa returns the class itself as the 1st element |
410 | # use @_ as a pre-allocated scratch array |
411 | (undef, @_) = @{mro::get_linear_isa( length( ref($_[0]) ) ? ref($_[0]) : $_[0] )}; |
412 | @_; |
a49c32d9 |
413 | }; |
414 | |
8e0a387b |
415 | =head2 make_group_accessor |
416 | |
417 | __PACKAGE__->make_group_accessor('simple', 'hair_length', 'hair_length'); |
418 | __PACKAGE__->make_group_accessor('simple', 'hc', 'hair_color'); |
419 | |
420 | =over 4 |
421 | |
422 | =item Arguments: $group, $field, $accessor |
423 | |
424 | Returns: \&accessor_coderef ? |
425 | |
426 | =back |
427 | |
428 | Called by mk_group_accessors for each entry in @fieldspec. Either returns |
429 | a coderef which will be installed at C<&__PACKAGE__::$accessor>, or returns |
430 | C<undef> if it elects to install the coderef on its own. |
431 | |
432 | =cut |
433 | |
434 | sub make_group_accessor { $gen_accessor->('rw', @_) } |
435 | |
436 | =head2 make_group_ro_accessor |
437 | |
438 | __PACKAGE__->make_group_ro_accessor('simple', 'birthdate', 'birthdate'); |
439 | __PACKAGE__->make_group_ro_accessor('simple', 'ssn', 'social_security_number'); |
440 | |
441 | =over 4 |
442 | |
443 | =item Arguments: $group, $field, $accessor |
444 | |
445 | Returns: \&accessor_coderef ? |
446 | |
447 | =back |
448 | |
449 | Called by mk_group_ro_accessors for each entry in @fieldspec. Either returns |
450 | a coderef which will be installed at C<&__PACKAGE__::$accessor>, or returns |
451 | C<undef> if it elects to install the coderef on its own. |
452 | |
453 | =cut |
454 | |
455 | sub make_group_ro_accessor { $gen_accessor->('ro', @_) } |
456 | |
457 | =head2 make_group_wo_accessor |
458 | |
459 | __PACKAGE__->make_group_wo_accessor('simple', 'lie', 'lie'); |
460 | __PACKAGE__->make_group_wo_accessor('simple', 'subj', 'subject'); |
461 | |
462 | =over 4 |
463 | |
464 | =item Arguments: $group, $field, $accessor |
465 | |
466 | Returns: \&accessor_coderef ? |
467 | |
468 | =back |
469 | |
470 | Called by mk_group_wo_accessors for each entry in @fieldspec. Either returns |
471 | a coderef which will be installed at C<&__PACKAGE__::$accessor>, or returns |
472 | C<undef> if it elects to install the coderef on its own. |
473 | |
474 | =cut |
475 | |
476 | sub make_group_wo_accessor { $gen_accessor->('wo', @_) } |
477 | |
478 | |
9d7d52da |
479 | =head1 PERFORMANCE |
15cf8e32 |
480 | |
8019c4d8 |
481 | To provide total flexibility L<Class::Accessor::Grouped> calls methods |
482 | internally while performing get/set actions, which makes it noticeably |
483 | slower than similar modules. To compensate, this module will automatically |
484 | use the insanely fast L<Class::XSAccessor> to generate the C<simple>-group |
b36cd259 |
485 | accessors if this module is available on your system. |
8019c4d8 |
486 | |
487 | =head2 Benchmark |
488 | |
489 | This is the result of a set/get/set loop benchmark on perl 5.12.1 with |
490 | thread support, showcasing most popular accessor builders: L<Moose>, L<Mouse>, |
af71d687 |
491 | L<Moo>, L<CAF|Class::Accessor::Fast>, L<CAF_XS|Class::Accessor::Fast::XS>, |
492 | L<XSA|Class::XSAccessor>, and L<CAF_XSA|Class::XSAccessor::Compat>: |
493 | |
494 | Rate CAG moOse CAF moUse moo HANDMADE CAF_XS moUse_XS moo_XS CAF_XSA XSA CAG_XS |
495 | CAG 169/s -- -21% -24% -32% -32% -34% -59% -63% -67% -67% -67% -67% |
496 | moOse 215/s 27% -- -3% -13% -13% -15% -48% -53% -58% -58% -58% -58% |
497 | CAF 222/s 31% 3% -- -10% -10% -13% -46% -52% -57% -57% -57% -57% |
498 | moUse 248/s 46% 15% 11% -- -0% -3% -40% -46% -52% -52% -52% -52% |
499 | moo 248/s 46% 15% 11% 0% -- -3% -40% -46% -52% -52% -52% -52% |
500 | HANDMADE 255/s 50% 18% 14% 3% 3% -- -38% -45% -50% -51% -51% -51% |
501 | CAF_XS 411/s 143% 91% 85% 66% 66% 61% -- -11% -20% -20% -21% -21% |
502 | moUse_XS 461/s 172% 114% 107% 86% 86% 81% 12% -- -10% -11% -11% -11% |
503 | moo_XS 514/s 204% 139% 131% 107% 107% 102% 25% 12% -- -0% -1% -1% |
504 | CAF_XSA 516/s 205% 140% 132% 108% 108% 103% 26% 12% 0% -- -0% -0% |
505 | XSA 519/s 206% 141% 133% 109% 109% 104% 26% 13% 1% 0% -- -0% |
506 | CAG_XS 519/s 206% 141% 133% 109% 109% 104% 26% 13% 1% 0% 0% -- |
8019c4d8 |
507 | |
508 | Benchmark program is available in the root of the |
509 | L<repository|http://search.cpan.org/dist/Class-Accessor-Grouped/>: |
510 | |
511 | =head2 Notes on Class::XSAccessor |
512 | |
bd83e674 |
513 | You can force (or disable) the use of L<Class::XSAccessor> before creating a |
514 | particular C<simple> accessor by either manipulating the global variable |
515 | C<$Class::Accessor::Grouped::USE_XS> to true or false (preferably with |
516 | L<localization|perlfunc/local>, or you can do so before runtime via the |
517 | C<CAG_USE_XS> environment variable. |
518 | |
519 | Since L<Class::XSAccessor> has no knowledge of L</get_simple> and |
520 | L</set_simple> this module does its best to detect if you are overriding |
521 | one of these methods and will fall back to using the perl version of the |
522 | accessor in order to maintain consistency. However be aware that if you |
523 | enable use of C<Class::XSAccessor> (automatically or explicitly), create |
524 | an object, invoke a simple accessor on that object, and B<then> manipulate |
525 | the symbol table to install a C<get/set_simple> override - you get to keep |
526 | all the pieces. |
527 | |
963a69a5 |
528 | =head1 AUTHORS |
529 | |
530 | Matt S. Trout <mst@shadowcatsystems.co.uk> |
ba6f7b1b |
531 | |
97972dcb |
532 | Christopher H. Laco <claco@chrislaco.com> |
963a69a5 |
533 | |
8ef9b3ff |
534 | =head1 CONTRIBUTORS |
dfb86526 |
535 | |
ba6f7b1b |
536 | Caelum: Rafael Kitover <rkitover@cpan.org> |
537 | |
3b118c10 |
538 | frew: Arthur Axel "fREW" Schmidt <frioux@gmail.com> |
539 | |
8ef9b3ff |
540 | groditi: Guillermo Roditi <groditi@cpan.org> |
ba6f7b1b |
541 | |
6a4c729f |
542 | Jason Plum <jason.plum@bmmsi.com> |
dfb86526 |
543 | |
ba6f7b1b |
544 | ribasushi: Peter Rabbitson <ribasushi@cpan.org> |
545 | |
546 | |
4fe25633 |
547 | =head1 COPYRIGHT & LICENSE |
963a69a5 |
548 | |
af169484 |
549 | Copyright (c) 2006-2010 Matt S. Trout <mst@shadowcatsystems.co.uk> |
963a69a5 |
550 | |
4fe25633 |
551 | This program is free software; you can redistribute it and/or modify |
552 | it under the same terms as perl itself. |
963a69a5 |
553 | |
4fe25633 |
554 | =cut |
85ccab9a |
555 | |
556 | ######################################################################## |
557 | ######################################################################## |
558 | ######################################################################## |
559 | # |
560 | # Here be many angry dragons |
561 | # (all code is in private coderefs since everything inherits CAG) |
562 | # |
563 | ######################################################################## |
564 | ######################################################################## |
565 | |
85ccab9a |
566 | # Autodetect unless flag supplied |
85ccab9a |
567 | my $xsa_autodetected; |
568 | if (! defined $USE_XS) { |
3f6054c4 |
569 | $USE_XS = __CAG_ENV__::NO_CXSA ? 0 : 1; |
85ccab9a |
570 | $xsa_autodetected++; |
571 | } |
572 | |
573 | my $maker_templates = { |
574 | rw => { |
575 | xs_call => 'accessors', |
576 | pp_code => sub { |
98694bf0 |
577 | my $set = "set_$_[0]"; |
578 | my $get = "get_$_[0]"; |
579 | my $field = $_[1]; |
85ccab9a |
580 | $field =~ s/'/\\'/g; |
581 | |
582 | " |
af71d687 |
583 | \@_ != 1 |
85ccab9a |
584 | ? shift->$set('$field', \@_) |
585 | : shift->$get('$field') |
586 | " |
587 | }, |
588 | }, |
589 | ro => { |
590 | xs_call => 'getters', |
591 | pp_code => sub { |
98694bf0 |
592 | my $get = "get_$_[0]"; |
593 | my $field = $_[1]; |
85ccab9a |
594 | $field =~ s/'/\\'/g; |
595 | |
596 | " |
597 | \@_ == 1 |
598 | ? shift->$get('$field') |
599 | : do { |
600 | my \$caller = caller; |
48dfec72 |
601 | my \$class = length( ref(\$_[0]) ) ? ref(\$_[0]) : \$_[0]; |
98694bf0 |
602 | Carp::croak(\"'\$caller' cannot alter the value of '$field' \". |
603 | \"(read-only attributes of class '\$class')\"); |
85ccab9a |
604 | } |
605 | " |
606 | }, |
607 | }, |
608 | wo => { |
609 | xs_call => 'setters', |
610 | pp_code => sub { |
98694bf0 |
611 | my $set = "set_$_[0]"; |
612 | my $field = $_[1]; |
85ccab9a |
613 | $field =~ s/'/\\'/g; |
614 | |
615 | " |
af71d687 |
616 | \@_ != 1 |
85ccab9a |
617 | ? shift->$set('$field', \@_) |
618 | : do { |
619 | my \$caller = caller; |
48dfec72 |
620 | my \$class = length ( ref(\$_[0]) ) ? ref(\$_[0]) : \$_[0]; |
98694bf0 |
621 | Carp::croak(\"'\$caller' cannot access the value of '$field' \". |
622 | \"(write-only attributes of class '\$class')\"); |
85ccab9a |
623 | } |
624 | " |
625 | }, |
626 | }, |
627 | }; |
628 | |
629 | |
630 | my ($accessor_maker_cache, $no_xsa_warned_classes); |
631 | |
632 | # can't use pkg_gen to track this stuff, as it doesn't |
633 | # detect superclass mucking |
634 | my $original_simple_getter = __PACKAGE__->can ('get_simple'); |
635 | my $original_simple_setter = __PACKAGE__->can ('set_simple'); |
636 | |
637 | # Note!!! Unusual signature |
638 | $gen_accessor = sub { |
639 | my ($type, $class, $group, $field, $methname) = @_; |
48dfec72 |
640 | $class = ref $class if length ref $class; |
85ccab9a |
641 | |
642 | # When installing an XSA simple accessor, we need to make sure we are not |
643 | # short-circuiting a (compile or runtime) get_simple/set_simple override. |
644 | # What we do here is install a lazy first-access check, which will decide |
645 | # the ultimate coderef being placed in the accessor slot |
f7cf6867 |
646 | # |
647 | # Also note that the *original* class will always retain this shim, as |
648 | # different branches inheriting from it may have different overrides. |
649 | # Thus the final method (properly labeled and all) is installed in the |
650 | # calling-package's namespace |
85ccab9a |
651 | if ($USE_XS and $group eq 'simple') { |
3f6054c4 |
652 | die sprintf( "Class::XSAccessor requested but not available:\n%s\n", __CAG_ENV__::NO_CXSA ) |
653 | if __CAG_ENV__::NO_CXSA; |
f7cf6867 |
654 | |
de167379 |
655 | my ($expected_cref, $cached_implementation); |
656 | my $ret = $expected_cref = sub { |
48dfec72 |
657 | my $current_class = length (ref ($_[0] ) ) ? ref ($_[0]) : $_[0]; |
f7cf6867 |
658 | |
de167379 |
659 | # $cached_implementation will be set only if the shim got |
660 | # 'around'ed, in which case it is handy to avoid re-running |
661 | # this block over and over again |
662 | my $resolved_implementation = $cached_implementation->{$current_class} || do { |
663 | if ( |
ad0ed975 |
664 | ($current_class->can('get_simple')||0) == $original_simple_getter |
de167379 |
665 | && |
ad0ed975 |
666 | ($current_class->can('set_simple')||0) == $original_simple_setter |
de167379 |
667 | ) { |
668 | # nothing has changed, might as well use the XS crefs |
669 | # |
670 | # note that by the time this code executes, we already have |
671 | # *objects* (since XSA works on 'simple' only by definition). |
672 | # If someone is mucking with the symbol table *after* there |
673 | # are some objects already - look! many, shiny pieces! :) |
674 | # |
675 | # The weird breeder thingy is because XSA does not have an |
676 | # interface returning *just* a coderef, without installing it |
677 | # anywhere :( |
678 | Class::XSAccessor->import( |
679 | replace => 1, |
680 | class => '__CAG__XSA__BREEDER__', |
681 | $maker_templates->{$type}{xs_call} => { |
682 | $methname => $field, |
683 | }, |
684 | ); |
685 | __CAG__XSA__BREEDER__->can($methname); |
686 | } |
687 | else { |
688 | if (! $xsa_autodetected and ! $no_xsa_warned_classes->{$current_class}++) { |
689 | # not using Carp since the line where this happens doesn't mean much |
690 | warn 'Explicitly requested use of Class::XSAccessor disabled for objects of class ' |
691 | . "'$current_class' inheriting from '$class' due to an overriden get_simple and/or " |
692 | . "set_simple\n"; |
693 | } |
694 | |
695 | do { |
696 | # that's faster than local |
697 | $USE_XS = 0; |
698 | my $c = $gen_accessor->($type, $class, 'simple', $field, $methname); |
699 | $USE_XS = 1; |
700 | $c; |
701 | }; |
702 | } |
703 | }; |
704 | |
705 | # if after this shim was created someone wrapped it with an 'around', |
706 | # we can not blindly reinstall the method slot - we will destroy the |
707 | # wrapper. Silently chain execution further... |
ad0ed975 |
708 | if ( !$expected_cref or $expected_cref != ($current_class->can($methname)||0) ) { |
de167379 |
709 | |
710 | # there is no point in re-determining it on every subsequent call, |
711 | # just store for future reference |
712 | $cached_implementation->{$current_class} ||= $resolved_implementation; |
713 | |
714 | # older perls segfault if the cref behind the goto throws |
715 | # http://rt.perl.org/rt3/Public/Bug/Display.html?id=35878 |
3f6054c4 |
716 | return $resolved_implementation->(@_) if __CAG_ENV__::BROKEN_GOTO; |
de167379 |
717 | |
718 | goto $resolved_implementation; |
719 | } |
720 | |
3f6054c4 |
721 | if (__CAG_ENV__::TRACK_UNDEFER_FAIL) { |
2d392af1 |
722 | my $deferred_calls_seen = do { |
723 | no strict 'refs'; |
724 | \%{"${current_class}::__cag_deferred_xs_shim_invocations"} |
725 | }; |
e6f2993f |
726 | my @cframe = caller(0); |
2d392af1 |
727 | if (my $already_seen = $deferred_calls_seen->{$cframe[3]}) { |
e6f2993f |
728 | Carp::carp ( |
729 | "Deferred version of method $cframe[3] invoked more than once (originally " |
2d392af1 |
730 | . "invoked at $already_seen). This is a strong indication your code has " |
731 | . 'cached the original ->can derived method coderef, and is using it instead ' |
732 | . 'of the proper method re-lookup, causing performance regressions' |
e6f2993f |
733 | ); |
734 | } |
735 | else { |
2d392af1 |
736 | $deferred_calls_seen->{$cframe[3]} = "$cframe[1] line $cframe[2]"; |
e6f2993f |
737 | } |
738 | } |
739 | |
de167379 |
740 | # install the resolved implementation into the code slot so we do not |
741 | # come here anymore (hopefully) |
742 | # since XSAccessor was available - so is Sub::Name |
743 | { |
e6f2993f |
744 | no strict 'refs'; |
745 | no warnings 'redefine'; |
85ccab9a |
746 | |
f7cf6867 |
747 | my $fq_name = "${current_class}::${methname}"; |
de167379 |
748 | *$fq_name = Sub::Name::subname($fq_name, $resolved_implementation); |
749 | |
750 | # need to update what the shim expects too *in case* its |
751 | # ->can was cached for some moronic reason |
752 | $expected_cref = $resolved_implementation; |
753 | Scalar::Util::weaken($expected_cref); |
f7cf6867 |
754 | } |
85ccab9a |
755 | |
f7cf6867 |
756 | # older perls segfault if the cref behind the goto throws |
757 | # http://rt.perl.org/rt3/Public/Bug/Display.html?id=35878 |
3f6054c4 |
758 | return $resolved_implementation->(@_) if __CAG_ENV__::BROKEN_GOTO; |
85ccab9a |
759 | |
de167379 |
760 | goto $resolved_implementation; |
f7cf6867 |
761 | }; |
de167379 |
762 | |
763 | Scalar::Util::weaken($expected_cref); # to break the self-reference |
764 | $ret; |
85ccab9a |
765 | } |
766 | |
767 | # no Sub::Name - just install the coderefs directly (compiling every time) |
3f6054c4 |
768 | elsif (__CAG_ENV__::NO_SUBNAME) { |
eda06cc6 |
769 | my $src = $accessor_maker_cache->{source}{$type}{$group}{$field} ||= |
770 | $maker_templates->{$type}{pp_code}->($group, $field); |
771 | |
fdb75175 |
772 | no warnings 'redefine'; |
3f6054c4 |
773 | local $@ if __CAG_ENV__::UNSTABLE_DOLLARAT; |
bd975094 |
774 | eval "sub ${class}::${methname} { $src }"; |
eda06cc6 |
775 | |
e6f2993f |
776 | undef; # so that no further attempt will be made to install anything |
85ccab9a |
777 | } |
778 | |
779 | # a coderef generator with a variable pad (returns a fresh cref on every invocation) |
85ccab9a |
780 | else { |
e6f2993f |
781 | ($accessor_maker_cache->{pp}{$type}{$group}{$field} ||= do { |
eda06cc6 |
782 | my $src = $accessor_maker_cache->{source}{$type}{$group}{$field} ||= |
783 | $maker_templates->{$type}{pp_code}->($group, $field); |
784 | |
3f6054c4 |
785 | local $@ if __CAG_ENV__::UNSTABLE_DOLLARAT; |
eda06cc6 |
786 | eval "sub { my \$dummy; sub { \$dummy if 0; $src } }" or die $@; |
85ccab9a |
787 | })->() |
788 | } |
789 | }; |
790 | |
791 | 1; |