Commit | Line | Data |
963a69a5 |
1 | package Class::Accessor::Grouped; |
2 | use strict; |
3 | use warnings; |
a0bce8bc |
4 | use Carp (); |
a0bce8bc |
5 | use Scalar::Util (); |
df845078 |
6 | |
7 | BEGIN { |
8 | if ($] < 5.009_005) { |
9 | require MRO::Compat; |
10 | } |
11 | else { |
12 | require mro; |
13 | } |
14 | } |
331e820d |
15 | |
ee3f0e62 |
16 | our $VERSION = '0.10002'; |
d93670a5 |
17 | $VERSION = eval $VERSION if $VERSION =~ /_/; # numify for warning-free dev releases |
963a69a5 |
18 | |
85ccab9a |
19 | # when changing minimum version don't forget to adjust L</PERFORMANCE> and |
20 | # the Makefile.PL as well |
21 | our $__minimum_xsa_version; |
22 | BEGIN { |
b36cd259 |
23 | $__minimum_xsa_version = '1.11'; |
85ccab9a |
24 | } |
9f562456 |
25 | |
8019c4d8 |
26 | our $USE_XS; |
27 | # the unless defined is here so that we can override the value |
28 | # before require/use, *regardless* of the state of $ENV{CAG_USE_XS} |
29 | $USE_XS = $ENV{CAG_USE_XS} |
30 | unless defined $USE_XS; |
af169484 |
31 | |
8079caeb |
32 | # Yes this method is undocumented |
85ccab9a |
33 | # Yes it should be a private coderef like all the rest at the end of this file |
8079caeb |
34 | # No we can't do that (yet) because the DBIC-CDBI compat layer overrides it |
35 | # %$*@!?&!&#*$!!! |
36 | sub _mk_group_accessors { |
eece2562 |
37 | my($self, $maker, $group, @fields) = @_; |
38 | my $class = Scalar::Util::blessed $self || $self; |
39 | |
40 | no strict 'refs'; |
41 | no warnings 'redefine'; |
42 | |
43 | # So we don't have to do lots of lookups inside the loop. |
85ccab9a |
44 | $maker = $self->can($maker) unless ref $maker; |
eece2562 |
45 | |
46 | foreach (@fields) { |
47 | if( $_ eq 'DESTROY' ) { |
48 | Carp::carp("Having a data accessor named DESTROY in ". |
49 | "'$class' is unwise."); |
50 | } |
51 | |
52 | my ($name, $field) = (ref $_) |
53 | ? (@$_) |
54 | : ($_, $_) |
55 | ; |
56 | |
57 | my $alias = "_${name}_accessor"; |
58 | |
59 | for my $meth ($name, $alias) { |
60 | |
61 | # the maker may elect to not return anything, meaning it already |
85ccab9a |
62 | # installed the coderef for us (e.g. lack of Sub::Name) |
eece2562 |
63 | my $cref = $self->$maker($group, $field, $meth) |
64 | or next; |
65 | |
85ccab9a |
66 | my $fq_meth = "${class}::${meth}"; |
eece2562 |
67 | |
68 | *$fq_meth = Sub::Name::subname($fq_meth, $cref); |
69 | #unless defined &{$class."\:\:$field"} |
70 | } |
71 | } |
72 | }; |
73 | |
85ccab9a |
74 | # coderef is setup at the end for clarity |
75 | my $gen_accessor; |
eece2562 |
76 | |
963a69a5 |
77 | =head1 NAME |
78 | |
1ad8d8c6 |
79 | Class::Accessor::Grouped - Lets you build groups of accessors |
963a69a5 |
80 | |
81 | =head1 SYNOPSIS |
82 | |
83 | =head1 DESCRIPTION |
84 | |
85 | This class lets you build groups of accessors that will call different |
86 | getters and setters. |
87 | |
88 | =head1 METHODS |
89 | |
90 | =head2 mk_group_accessors |
91 | |
92 | =over 4 |
93 | |
94 | =item Arguments: $group, @fieldspec |
95 | |
96 | Returns: none |
97 | |
98 | =back |
99 | |
100 | Creates a set of accessors in a given group. |
101 | |
102 | $group is the name of the accessor group for the generated accessors; they |
103 | will call get_$group($field) on get and set_$group($field, $value) on set. |
104 | |
22fa6720 |
105 | If you want to mimic Class::Accessor's mk_accessors $group has to be 'simple' |
106 | to tell Class::Accessor::Grouped to use its own get_simple and set_simple |
107 | methods. |
108 | |
963a69a5 |
109 | @fieldspec is a list of field/accessor names; if a fieldspec is a scalar |
110 | this is used as both field and accessor name, if a listref it is expected to |
111 | be of the form [ $accessor, $field ]. |
112 | |
113 | =cut |
114 | |
115 | sub mk_group_accessors { |
85ccab9a |
116 | my ($self, $group, @fields) = @_; |
963a69a5 |
117 | |
85ccab9a |
118 | $self->_mk_group_accessors('make_group_accessor', $group, @fields); |
119 | return; |
963a69a5 |
120 | } |
121 | |
963a69a5 |
122 | =head2 mk_group_ro_accessors |
123 | |
124 | =over 4 |
125 | |
126 | =item Arguments: $group, @fieldspec |
127 | |
128 | Returns: none |
129 | |
130 | =back |
131 | |
132 | Creates a set of read only accessors in a given group. Identical to |
a557f8ad |
133 | L</mk_group_accessors> but accessors will throw an error if passed a value |
963a69a5 |
134 | rather than setting the value. |
135 | |
136 | =cut |
137 | |
138 | sub mk_group_ro_accessors { |
139 | my($self, $group, @fields) = @_; |
140 | |
8079caeb |
141 | $self->_mk_group_accessors('make_group_ro_accessor', $group, @fields); |
963a69a5 |
142 | } |
143 | |
144 | =head2 mk_group_wo_accessors |
145 | |
146 | =over 4 |
147 | |
148 | =item Arguments: $group, @fieldspec |
149 | |
150 | Returns: none |
151 | |
152 | =back |
153 | |
154 | Creates a set of write only accessors in a given group. Identical to |
a557f8ad |
155 | L</mk_group_accessors> but accessors will throw an error if not passed a |
963a69a5 |
156 | value rather than getting the value. |
157 | |
158 | =cut |
159 | |
160 | sub mk_group_wo_accessors { |
161 | my($self, $group, @fields) = @_; |
162 | |
8079caeb |
163 | $self->_mk_group_accessors('make_group_wo_accessor', $group, @fields); |
963a69a5 |
164 | } |
165 | |
166 | =head2 make_group_accessor |
167 | |
168 | =over 4 |
169 | |
8019c4d8 |
170 | =item Arguments: $group, $field, $method |
963a69a5 |
171 | |
8019c4d8 |
172 | Returns: \&accessor_coderef ? |
963a69a5 |
173 | |
174 | =back |
175 | |
8019c4d8 |
176 | Called by mk_group_accessors for each entry in @fieldspec. Either returns |
177 | a coderef which will be installed at C<&__PACKAGE__::$method>, or returns |
178 | C<undef> if it elects to install the coderef on its own. |
963a69a5 |
179 | |
180 | =cut |
181 | |
85ccab9a |
182 | sub make_group_accessor { $gen_accessor->('rw', @_) } |
963a69a5 |
183 | |
184 | =head2 make_group_ro_accessor |
185 | |
186 | =over 4 |
187 | |
8019c4d8 |
188 | =item Arguments: $group, $field, $method |
963a69a5 |
189 | |
8019c4d8 |
190 | Returns: \&accessor_coderef ? |
963a69a5 |
191 | |
192 | =back |
193 | |
8019c4d8 |
194 | Called by mk_group_ro_accessors for each entry in @fieldspec. Either returns |
195 | a coderef which will be installed at C<&__PACKAGE__::$method>, or returns |
196 | C<undef> if it elects to install the coderef on its own. |
963a69a5 |
197 | |
198 | =cut |
199 | |
85ccab9a |
200 | sub make_group_ro_accessor { $gen_accessor->('ro', @_) } |
963a69a5 |
201 | |
202 | =head2 make_group_wo_accessor |
203 | |
204 | =over 4 |
205 | |
8019c4d8 |
206 | =item Arguments: $group, $field, $method |
963a69a5 |
207 | |
8019c4d8 |
208 | Returns: \&accessor_coderef ? |
963a69a5 |
209 | |
210 | =back |
211 | |
8019c4d8 |
212 | Called by mk_group_wo_accessors for each entry in @fieldspec. Either returns |
213 | a coderef which will be installed at C<&__PACKAGE__::$method>, or returns |
214 | C<undef> if it elects to install the coderef on its own. |
963a69a5 |
215 | |
216 | =cut |
217 | |
85ccab9a |
218 | sub make_group_wo_accessor { $gen_accessor->('wo', @_) } |
963a69a5 |
219 | |
220 | =head2 get_simple |
221 | |
222 | =over 4 |
223 | |
224 | =item Arguments: $field |
225 | |
226 | Returns: $value |
227 | |
228 | =back |
229 | |
230 | Simple getter for hash-based objects which returns the value for the field |
231 | name passed as an argument. |
232 | |
233 | =cut |
234 | |
235 | sub get_simple { |
85ccab9a |
236 | return $_[0]->{$_[1]}; |
963a69a5 |
237 | } |
238 | |
239 | =head2 set_simple |
240 | |
241 | =over 4 |
242 | |
243 | =item Arguments: $field, $new_value |
244 | |
245 | Returns: $new_value |
246 | |
247 | =back |
248 | |
249 | Simple setter for hash-based objects which sets and then returns the value |
250 | for the field name passed as an argument. |
251 | |
252 | =cut |
253 | |
254 | sub set_simple { |
85ccab9a |
255 | return $_[0]->{$_[1]} = $_[2]; |
963a69a5 |
256 | } |
257 | |
e6f2a0fd |
258 | |
259 | =head2 get_inherited |
260 | |
261 | =over 4 |
262 | |
263 | =item Arguments: $field |
264 | |
265 | Returns: $value |
266 | |
267 | =back |
268 | |
331e820d |
269 | Simple getter for Classes and hash-based objects which returns the value for |
270 | the field name passed as an argument. This behaves much like |
271 | L<Class::Data::Accessor> where the field can be set in a base class, |
272 | inherited and changed in subclasses, and inherited and changed for object |
273 | instances. |
e6f2a0fd |
274 | |
275 | =cut |
276 | |
277 | sub get_inherited { |
a49c32d9 |
278 | my $class; |
e6f2a0fd |
279 | |
eece2562 |
280 | if ( defined( $class = Scalar::Util::blessed $_[0] ) ) { |
62cf9924 |
281 | if (Scalar::Util::reftype $_[0] eq 'HASH') { |
282 | return $_[0]->{$_[1]} if exists $_[0]->{$_[1]}; |
283 | } |
284 | else { |
285 | Carp::croak('Cannot get inherited value on an object instance that is not hash-based'); |
286 | } |
287 | } |
288 | else { |
a0bce8bc |
289 | $class = $_[0]; |
62cf9924 |
290 | } |
e6f2a0fd |
291 | |
292 | no strict 'refs'; |
eece2562 |
293 | no warnings 'uninitialized'; |
62cf9924 |
294 | |
295 | my $cag_slot = '::__cag_'. $_[1]; |
296 | return ${$class.$cag_slot} if defined(${$class.$cag_slot}); |
e6f2a0fd |
297 | |
4f8ce9da |
298 | # we need to be smarter about recalculation, as @ISA (thus supers) can very well change in-flight |
62cf9924 |
299 | my $cur_gen = mro::get_pkg_gen ($class); |
300 | if ( $cur_gen != ${$class.'::__cag_pkg_gen__'} ) { |
301 | @{$class.'::__cag_supers__'} = $_[0]->get_super_paths; |
302 | ${$class.'::__cag_pkg_gen__'} = $cur_gen; |
303 | } |
a49c32d9 |
304 | |
62cf9924 |
305 | for (@{$class.'::__cag_supers__'}) { |
306 | return ${$_.$cag_slot} if defined(${$_.$cag_slot}); |
e6f2a0fd |
307 | }; |
c46050d3 |
308 | |
9c3d5179 |
309 | return undef; |
e6f2a0fd |
310 | } |
311 | |
312 | =head2 set_inherited |
313 | |
314 | =over 4 |
315 | |
316 | =item Arguments: $field, $new_value |
317 | |
318 | Returns: $new_value |
319 | |
320 | =back |
321 | |
331e820d |
322 | Simple setter for Classes and hash-based objects which sets and then returns |
323 | the value for the field name passed as an argument. When called on a hash-based |
324 | object it will set the appropriate hash key value. When called on a class, it |
325 | will set a class level variable. |
e6f2a0fd |
326 | |
331e820d |
327 | B<Note:>: This method will die if you try to set an object variable on a non |
328 | hash-based object. |
e6f2a0fd |
329 | |
330 | =cut |
331 | |
332 | sub set_inherited { |
eece2562 |
333 | if (defined Scalar::Util::blessed $_[0]) { |
a0bce8bc |
334 | if (Scalar::Util::reftype $_[0] eq 'HASH') { |
335 | return $_[0]->{$_[1]} = $_[2]; |
e6f2a0fd |
336 | } else { |
a0bce8bc |
337 | Carp::croak('Cannot set inherited value on an object instance that is not hash-based'); |
e6f2a0fd |
338 | }; |
339 | } else { |
340 | no strict 'refs'; |
341 | |
a0bce8bc |
342 | return ${$_[0].'::__cag_'.$_[1]} = $_[2]; |
e6f2a0fd |
343 | }; |
344 | } |
345 | |
331e820d |
346 | =head2 get_component_class |
347 | |
348 | =over 4 |
349 | |
350 | =item Arguments: $field |
351 | |
352 | Returns: $value |
353 | |
354 | =back |
355 | |
356 | Gets the value of the specified component class. |
357 | |
358 | __PACKAGE__->mk_group_accessors('component_class' => 'result_class'); |
97d76fb4 |
359 | |
331e820d |
360 | $self->result_class->method(); |
97d76fb4 |
361 | |
331e820d |
362 | ## same as |
363 | $self->get_component_class('result_class')->method(); |
364 | |
365 | =cut |
366 | |
367 | sub get_component_class { |
a0bce8bc |
368 | return $_[0]->get_inherited($_[1]); |
331e820d |
369 | }; |
370 | |
371 | =head2 set_component_class |
372 | |
373 | =over 4 |
374 | |
375 | =item Arguments: $field, $class |
376 | |
377 | Returns: $new_value |
378 | |
379 | =back |
380 | |
381 | Inherited accessor that automatically loads the specified class before setting |
382 | it. This method will die if the specified class could not be loaded. |
383 | |
384 | __PACKAGE__->mk_group_accessors('component_class' => 'result_class'); |
385 | __PACKAGE__->result_class('MyClass'); |
97d76fb4 |
386 | |
331e820d |
387 | $self->result_class->method(); |
388 | |
389 | =cut |
390 | |
391 | sub set_component_class { |
a0bce8bc |
392 | if ($_[2]) { |
bce7bdf8 |
393 | local $^W = 0; |
01249db5 |
394 | require Class::Inspector; |
a0bce8bc |
395 | if (Class::Inspector->installed($_[2]) && !Class::Inspector->loaded($_[2])) { |
85ccab9a |
396 | eval "require $_[2]"; |
331e820d |
397 | |
a0bce8bc |
398 | Carp::croak("Could not load $_[1] '$_[2]': ", $@) if $@; |
331e820d |
399 | }; |
400 | }; |
401 | |
a0bce8bc |
402 | return $_[0]->set_inherited($_[1], $_[2]); |
331e820d |
403 | }; |
404 | |
a49c32d9 |
405 | =head2 get_super_paths |
406 | |
407 | Returns a list of 'parent' or 'super' class names that the current class inherited from. |
408 | |
409 | =cut |
410 | |
411 | sub get_super_paths { |
62cf9924 |
412 | return @{mro::get_linear_isa( ref($_[0]) || $_[0] )}; |
a49c32d9 |
413 | }; |
414 | |
9d7d52da |
415 | =head1 PERFORMANCE |
15cf8e32 |
416 | |
8019c4d8 |
417 | To provide total flexibility L<Class::Accessor::Grouped> calls methods |
418 | internally while performing get/set actions, which makes it noticeably |
419 | slower than similar modules. To compensate, this module will automatically |
420 | use the insanely fast L<Class::XSAccessor> to generate the C<simple>-group |
b36cd259 |
421 | accessors if this module is available on your system. |
8019c4d8 |
422 | |
423 | =head2 Benchmark |
424 | |
425 | This is the result of a set/get/set loop benchmark on perl 5.12.1 with |
426 | thread support, showcasing most popular accessor builders: L<Moose>, L<Mouse>, |
af71d687 |
427 | L<Moo>, L<CAF|Class::Accessor::Fast>, L<CAF_XS|Class::Accessor::Fast::XS>, |
428 | L<XSA|Class::XSAccessor>, and L<CAF_XSA|Class::XSAccessor::Compat>: |
429 | |
430 | Rate CAG moOse CAF moUse moo HANDMADE CAF_XS moUse_XS moo_XS CAF_XSA XSA CAG_XS |
431 | CAG 169/s -- -21% -24% -32% -32% -34% -59% -63% -67% -67% -67% -67% |
432 | moOse 215/s 27% -- -3% -13% -13% -15% -48% -53% -58% -58% -58% -58% |
433 | CAF 222/s 31% 3% -- -10% -10% -13% -46% -52% -57% -57% -57% -57% |
434 | moUse 248/s 46% 15% 11% -- -0% -3% -40% -46% -52% -52% -52% -52% |
435 | moo 248/s 46% 15% 11% 0% -- -3% -40% -46% -52% -52% -52% -52% |
436 | HANDMADE 255/s 50% 18% 14% 3% 3% -- -38% -45% -50% -51% -51% -51% |
437 | CAF_XS 411/s 143% 91% 85% 66% 66% 61% -- -11% -20% -20% -21% -21% |
438 | moUse_XS 461/s 172% 114% 107% 86% 86% 81% 12% -- -10% -11% -11% -11% |
439 | moo_XS 514/s 204% 139% 131% 107% 107% 102% 25% 12% -- -0% -1% -1% |
440 | CAF_XSA 516/s 205% 140% 132% 108% 108% 103% 26% 12% 0% -- -0% -0% |
441 | XSA 519/s 206% 141% 133% 109% 109% 104% 26% 13% 1% 0% -- -0% |
442 | CAG_XS 519/s 206% 141% 133% 109% 109% 104% 26% 13% 1% 0% 0% -- |
8019c4d8 |
443 | |
444 | Benchmark program is available in the root of the |
445 | L<repository|http://search.cpan.org/dist/Class-Accessor-Grouped/>: |
446 | |
447 | =head2 Notes on Class::XSAccessor |
448 | |
bd83e674 |
449 | You can force (or disable) the use of L<Class::XSAccessor> before creating a |
450 | particular C<simple> accessor by either manipulating the global variable |
451 | C<$Class::Accessor::Grouped::USE_XS> to true or false (preferably with |
452 | L<localization|perlfunc/local>, or you can do so before runtime via the |
453 | C<CAG_USE_XS> environment variable. |
454 | |
455 | Since L<Class::XSAccessor> has no knowledge of L</get_simple> and |
456 | L</set_simple> this module does its best to detect if you are overriding |
457 | one of these methods and will fall back to using the perl version of the |
458 | accessor in order to maintain consistency. However be aware that if you |
459 | enable use of C<Class::XSAccessor> (automatically or explicitly), create |
460 | an object, invoke a simple accessor on that object, and B<then> manipulate |
461 | the symbol table to install a C<get/set_simple> override - you get to keep |
462 | all the pieces. |
463 | |
963a69a5 |
464 | =head1 AUTHORS |
465 | |
466 | Matt S. Trout <mst@shadowcatsystems.co.uk> |
ba6f7b1b |
467 | |
97972dcb |
468 | Christopher H. Laco <claco@chrislaco.com> |
963a69a5 |
469 | |
8ef9b3ff |
470 | =head1 CONTRIBUTORS |
dfb86526 |
471 | |
ba6f7b1b |
472 | Caelum: Rafael Kitover <rkitover@cpan.org> |
473 | |
8ef9b3ff |
474 | groditi: Guillermo Roditi <groditi@cpan.org> |
ba6f7b1b |
475 | |
6a4c729f |
476 | Jason Plum <jason.plum@bmmsi.com> |
dfb86526 |
477 | |
ba6f7b1b |
478 | ribasushi: Peter Rabbitson <ribasushi@cpan.org> |
479 | |
480 | |
4fe25633 |
481 | =head1 COPYRIGHT & LICENSE |
963a69a5 |
482 | |
af169484 |
483 | Copyright (c) 2006-2010 Matt S. Trout <mst@shadowcatsystems.co.uk> |
963a69a5 |
484 | |
4fe25633 |
485 | This program is free software; you can redistribute it and/or modify |
486 | it under the same terms as perl itself. |
963a69a5 |
487 | |
4fe25633 |
488 | =cut |
85ccab9a |
489 | |
490 | ######################################################################## |
491 | ######################################################################## |
492 | ######################################################################## |
493 | # |
494 | # Here be many angry dragons |
495 | # (all code is in private coderefs since everything inherits CAG) |
496 | # |
497 | ######################################################################## |
498 | ######################################################################## |
499 | |
500 | BEGIN { |
501 | |
502 | die "Huh?! No minimum C::XSA version?!\n" |
503 | unless $__minimum_xsa_version; |
504 | |
505 | local $@; |
506 | my $err; |
507 | |
fdb75175 |
508 | |
85ccab9a |
509 | $err = eval { require Sub::Name; 1; } ? undef : do { |
510 | delete $INC{'Sub/Name.pm'}; # because older perls suck |
511 | $@; |
512 | }; |
513 | *__CAG_NO_SUBNAME = $err |
514 | ? sub () { $err } |
515 | : sub () { 0 } |
516 | ; |
517 | |
518 | |
519 | $err = eval { |
520 | require Class::XSAccessor; |
521 | Class::XSAccessor->VERSION($__minimum_xsa_version); |
522 | require Sub::Name; |
523 | 1; |
524 | } ? undef : do { |
525 | delete $INC{'Sub/Name.pm'}; # because older perls suck |
526 | delete $INC{'Class/XSAccessor.pm'}; |
527 | $@; |
528 | }; |
529 | *__CAG_NO_CXSA = $err |
530 | ? sub () { $err } |
531 | : sub () { 0 } |
532 | ; |
533 | |
534 | |
535 | *__CAG_BROKEN_GOTO = ($] < '5.008009') |
536 | ? sub () { 1 } |
537 | : sub () { 0 } |
538 | ; |
539 | |
eda06cc6 |
540 | |
541 | *__CAG_UNSTABLE_DOLLARAT = ($] < '5.013002') |
542 | ? sub () { 1 } |
543 | : sub () { 0 } |
544 | ; |
e6f2993f |
545 | |
546 | |
547 | *__CAG_TRACK_UNDEFER_FAIL = ( |
548 | $INC{'Test/Builder.pm'} || $INC{'Test/Builder2.pm'} |
549 | and |
21498f4a |
550 | $0 =~ m|^ x?t / .+ \.t $|x |
e6f2993f |
551 | ) ? sub () { 1 } |
552 | : sub () { 0 } |
553 | ; |
f7cf6867 |
554 | } |
85ccab9a |
555 | |
556 | # Autodetect unless flag supplied |
85ccab9a |
557 | my $xsa_autodetected; |
558 | if (! defined $USE_XS) { |
b36cd259 |
559 | $USE_XS = __CAG_NO_CXSA ? 0 : 1; |
85ccab9a |
560 | $xsa_autodetected++; |
561 | } |
562 | |
563 | my $maker_templates = { |
564 | rw => { |
565 | xs_call => 'accessors', |
566 | pp_code => sub { |
98694bf0 |
567 | my $set = "set_$_[0]"; |
568 | my $get = "get_$_[0]"; |
569 | my $field = $_[1]; |
85ccab9a |
570 | $field =~ s/'/\\'/g; |
571 | |
572 | " |
af71d687 |
573 | \@_ != 1 |
85ccab9a |
574 | ? shift->$set('$field', \@_) |
575 | : shift->$get('$field') |
576 | " |
577 | }, |
578 | }, |
579 | ro => { |
580 | xs_call => 'getters', |
581 | pp_code => sub { |
98694bf0 |
582 | my $get = "get_$_[0]"; |
583 | my $field = $_[1]; |
85ccab9a |
584 | $field =~ s/'/\\'/g; |
585 | |
586 | " |
587 | \@_ == 1 |
588 | ? shift->$get('$field') |
589 | : do { |
590 | my \$caller = caller; |
98694bf0 |
591 | my \$class = ref \$_[0] || \$_[0]; |
592 | Carp::croak(\"'\$caller' cannot alter the value of '$field' \". |
593 | \"(read-only attributes of class '\$class')\"); |
85ccab9a |
594 | } |
595 | " |
596 | }, |
597 | }, |
598 | wo => { |
599 | xs_call => 'setters', |
600 | pp_code => sub { |
98694bf0 |
601 | my $set = "set_$_[0]"; |
602 | my $field = $_[1]; |
85ccab9a |
603 | $field =~ s/'/\\'/g; |
604 | |
605 | " |
af71d687 |
606 | \@_ != 1 |
85ccab9a |
607 | ? shift->$set('$field', \@_) |
608 | : do { |
609 | my \$caller = caller; |
98694bf0 |
610 | my \$class = ref \$_[0] || \$_[0]; |
611 | Carp::croak(\"'\$caller' cannot access the value of '$field' \". |
612 | \"(write-only attributes of class '\$class')\"); |
85ccab9a |
613 | } |
614 | " |
615 | }, |
616 | }, |
617 | }; |
618 | |
619 | |
620 | my ($accessor_maker_cache, $no_xsa_warned_classes); |
621 | |
622 | # can't use pkg_gen to track this stuff, as it doesn't |
623 | # detect superclass mucking |
624 | my $original_simple_getter = __PACKAGE__->can ('get_simple'); |
625 | my $original_simple_setter = __PACKAGE__->can ('set_simple'); |
626 | |
627 | # Note!!! Unusual signature |
628 | $gen_accessor = sub { |
629 | my ($type, $class, $group, $field, $methname) = @_; |
34051fe0 |
630 | if (my $c = Scalar::Util::blessed( $class )) { |
85ccab9a |
631 | $class = $c; |
632 | } |
633 | |
634 | # When installing an XSA simple accessor, we need to make sure we are not |
635 | # short-circuiting a (compile or runtime) get_simple/set_simple override. |
636 | # What we do here is install a lazy first-access check, which will decide |
637 | # the ultimate coderef being placed in the accessor slot |
f7cf6867 |
638 | # |
639 | # Also note that the *original* class will always retain this shim, as |
640 | # different branches inheriting from it may have different overrides. |
641 | # Thus the final method (properly labeled and all) is installed in the |
642 | # calling-package's namespace |
85ccab9a |
643 | if ($USE_XS and $group eq 'simple') { |
f7cf6867 |
644 | die sprintf( "Class::XSAccessor requested but not available:\n%s\n", __CAG_NO_CXSA ) |
645 | if __CAG_NO_CXSA; |
646 | |
de167379 |
647 | my ($expected_cref, $cached_implementation); |
648 | my $ret = $expected_cref = sub { |
f7cf6867 |
649 | my $current_class = Scalar::Util::blessed( $_[0] ) || $_[0]; |
650 | |
de167379 |
651 | # $cached_implementation will be set only if the shim got |
652 | # 'around'ed, in which case it is handy to avoid re-running |
653 | # this block over and over again |
654 | my $resolved_implementation = $cached_implementation->{$current_class} || do { |
655 | if ( |
656 | $current_class->can('get_simple') == $original_simple_getter |
657 | && |
658 | $current_class->can('set_simple') == $original_simple_setter |
659 | ) { |
660 | # nothing has changed, might as well use the XS crefs |
661 | # |
662 | # note that by the time this code executes, we already have |
663 | # *objects* (since XSA works on 'simple' only by definition). |
664 | # If someone is mucking with the symbol table *after* there |
665 | # are some objects already - look! many, shiny pieces! :) |
666 | # |
667 | # The weird breeder thingy is because XSA does not have an |
668 | # interface returning *just* a coderef, without installing it |
669 | # anywhere :( |
670 | Class::XSAccessor->import( |
671 | replace => 1, |
672 | class => '__CAG__XSA__BREEDER__', |
673 | $maker_templates->{$type}{xs_call} => { |
674 | $methname => $field, |
675 | }, |
676 | ); |
677 | __CAG__XSA__BREEDER__->can($methname); |
678 | } |
679 | else { |
680 | if (! $xsa_autodetected and ! $no_xsa_warned_classes->{$current_class}++) { |
681 | # not using Carp since the line where this happens doesn't mean much |
682 | warn 'Explicitly requested use of Class::XSAccessor disabled for objects of class ' |
683 | . "'$current_class' inheriting from '$class' due to an overriden get_simple and/or " |
684 | . "set_simple\n"; |
685 | } |
686 | |
687 | do { |
688 | # that's faster than local |
689 | $USE_XS = 0; |
690 | my $c = $gen_accessor->($type, $class, 'simple', $field, $methname); |
691 | $USE_XS = 1; |
692 | $c; |
693 | }; |
694 | } |
695 | }; |
696 | |
697 | # if after this shim was created someone wrapped it with an 'around', |
698 | # we can not blindly reinstall the method slot - we will destroy the |
699 | # wrapper. Silently chain execution further... |
45c3ca9b |
700 | if ( !$expected_cref or $expected_cref != $current_class->can($methname) ) { |
de167379 |
701 | |
702 | # there is no point in re-determining it on every subsequent call, |
703 | # just store for future reference |
704 | $cached_implementation->{$current_class} ||= $resolved_implementation; |
705 | |
706 | # older perls segfault if the cref behind the goto throws |
707 | # http://rt.perl.org/rt3/Public/Bug/Display.html?id=35878 |
708 | return $resolved_implementation->(@_) if __CAG_BROKEN_GOTO; |
709 | |
710 | goto $resolved_implementation; |
711 | } |
712 | |
e6f2993f |
713 | if (__CAG_TRACK_UNDEFER_FAIL) { |
2d392af1 |
714 | my $deferred_calls_seen = do { |
715 | no strict 'refs'; |
716 | \%{"${current_class}::__cag_deferred_xs_shim_invocations"} |
717 | }; |
e6f2993f |
718 | my @cframe = caller(0); |
2d392af1 |
719 | if (my $already_seen = $deferred_calls_seen->{$cframe[3]}) { |
e6f2993f |
720 | Carp::carp ( |
721 | "Deferred version of method $cframe[3] invoked more than once (originally " |
2d392af1 |
722 | . "invoked at $already_seen). This is a strong indication your code has " |
723 | . 'cached the original ->can derived method coderef, and is using it instead ' |
724 | . 'of the proper method re-lookup, causing performance regressions' |
e6f2993f |
725 | ); |
726 | } |
727 | else { |
2d392af1 |
728 | $deferred_calls_seen->{$cframe[3]} = "$cframe[1] line $cframe[2]"; |
e6f2993f |
729 | } |
730 | } |
731 | |
de167379 |
732 | # install the resolved implementation into the code slot so we do not |
733 | # come here anymore (hopefully) |
734 | # since XSAccessor was available - so is Sub::Name |
735 | { |
e6f2993f |
736 | no strict 'refs'; |
737 | no warnings 'redefine'; |
85ccab9a |
738 | |
f7cf6867 |
739 | my $fq_name = "${current_class}::${methname}"; |
de167379 |
740 | *$fq_name = Sub::Name::subname($fq_name, $resolved_implementation); |
741 | |
742 | # need to update what the shim expects too *in case* its |
743 | # ->can was cached for some moronic reason |
744 | $expected_cref = $resolved_implementation; |
745 | Scalar::Util::weaken($expected_cref); |
f7cf6867 |
746 | } |
85ccab9a |
747 | |
f7cf6867 |
748 | # older perls segfault if the cref behind the goto throws |
749 | # http://rt.perl.org/rt3/Public/Bug/Display.html?id=35878 |
de167379 |
750 | return $resolved_implementation->(@_) if __CAG_BROKEN_GOTO; |
85ccab9a |
751 | |
de167379 |
752 | goto $resolved_implementation; |
f7cf6867 |
753 | }; |
de167379 |
754 | |
755 | Scalar::Util::weaken($expected_cref); # to break the self-reference |
756 | $ret; |
85ccab9a |
757 | } |
758 | |
759 | # no Sub::Name - just install the coderefs directly (compiling every time) |
760 | elsif (__CAG_NO_SUBNAME) { |
eda06cc6 |
761 | my $src = $accessor_maker_cache->{source}{$type}{$group}{$field} ||= |
762 | $maker_templates->{$type}{pp_code}->($group, $field); |
763 | |
fdb75175 |
764 | no warnings 'redefine'; |
eda06cc6 |
765 | local $@ if __CAG_UNSTABLE_DOLLARAT; |
bd975094 |
766 | eval "sub ${class}::${methname} { $src }"; |
eda06cc6 |
767 | |
e6f2993f |
768 | undef; # so that no further attempt will be made to install anything |
85ccab9a |
769 | } |
770 | |
771 | # a coderef generator with a variable pad (returns a fresh cref on every invocation) |
85ccab9a |
772 | else { |
e6f2993f |
773 | ($accessor_maker_cache->{pp}{$type}{$group}{$field} ||= do { |
eda06cc6 |
774 | my $src = $accessor_maker_cache->{source}{$type}{$group}{$field} ||= |
775 | $maker_templates->{$type}{pp_code}->($group, $field); |
776 | |
777 | local $@ if __CAG_UNSTABLE_DOLLARAT; |
778 | eval "sub { my \$dummy; sub { \$dummy if 0; $src } }" or die $@; |
85ccab9a |
779 | })->() |
780 | } |
781 | }; |
782 | |
783 | 1; |