Commit | Line | Data |
a20d9a3f |
1 | package DBM::Deep::Engine; |
2 | |
460b1067 |
3 | use 5.6.0; |
4 | |
a20d9a3f |
5 | use strict; |
460b1067 |
6 | use warnings; |
a20d9a3f |
7 | |
86867f3a |
8 | our $VERSION = q(0.99_01); |
9 | |
633df1fd |
10 | use Fcntl qw( :DEFAULT :flock ); |
359a01ac |
11 | use Scalar::Util (); |
a20d9a3f |
12 | |
21838116 |
13 | # File-wide notes: |
20b7f047 |
14 | # * To add to bucket_size, make sure you modify the following: |
15 | # - calculate_sizes() |
16 | # - _get_key_subloc() |
17 | # - add_bucket() - where the buckets are printed |
21838116 |
18 | |
8db25060 |
19 | ## |
20 | # Setup file and tag signatures. These should never change. |
21 | ## |
22 | sub SIG_FILE () { 'DPDB' } |
460b1067 |
23 | sub SIG_HEADER () { 'h' } |
8db25060 |
24 | sub SIG_INTERNAL () { 'i' } |
25 | sub SIG_HASH () { 'H' } |
26 | sub SIG_ARRAY () { 'A' } |
8db25060 |
27 | sub SIG_NULL () { 'N' } |
28 | sub SIG_DATA () { 'D' } |
29 | sub SIG_INDEX () { 'I' } |
30 | sub SIG_BLIST () { 'B' } |
7b1e1aa1 |
31 | sub SIG_FREE () { 'F' } |
86867f3a |
32 | sub SIG_KEYS () { 'K' } |
8db25060 |
33 | sub SIG_SIZE () { 1 } |
34 | |
612969fb |
35 | sub new { |
36 | my $class = shift; |
37 | my ($args) = @_; |
38 | |
39 | my $self = bless { |
86867f3a |
40 | long_size => 4, |
41 | long_pack => 'N', |
42 | data_size => 4, |
43 | data_pack => 'N', |
251dfd0e |
44 | |
86867f3a |
45 | digest => \&Digest::MD5::md5, |
46 | hash_size => 16, |
251dfd0e |
47 | |
81d16922 |
48 | ## |
86867f3a |
49 | # Maximum number of buckets per blist before another level of indexing is |
e0098e7f |
50 | # done. Increase this value for slightly greater speed, but larger database |
d5d7c51d |
51 | # files. DO NOT decrease this value below 16, due to risk of recursive |
52 | # reindex overrun. |
81d16922 |
53 | ## |
612969fb |
54 | max_buckets => 16, |
460b1067 |
55 | |
56 | fileobj => undef, |
359a01ac |
57 | obj => undef, |
612969fb |
58 | }, $class; |
59 | |
e0098e7f |
60 | if ( defined $args->{pack_size} ) { |
61 | if ( lc $args->{pack_size} eq 'small' ) { |
62 | $args->{long_size} = 2; |
c9b6d0d8 |
63 | $args->{long_pack} = 'n'; |
e0098e7f |
64 | } |
65 | elsif ( lc $args->{pack_size} eq 'medium' ) { |
66 | $args->{long_size} = 4; |
67 | $args->{long_pack} = 'N'; |
68 | } |
69 | elsif ( lc $args->{pack_size} eq 'large' ) { |
70 | $args->{long_size} = 8; |
71 | $args->{long_pack} = 'Q'; |
72 | } |
73 | else { |
74 | die "Unknown pack_size value: '$args->{pack_size}'\n"; |
75 | } |
76 | } |
77 | |
fde3db1a |
78 | # Grab the parameters we want to use |
79 | foreach my $param ( keys %$self ) { |
80 | next unless exists $args->{$param}; |
3e9498a1 |
81 | $self->{$param} = $args->{$param}; |
fde3db1a |
82 | } |
359a01ac |
83 | Scalar::Util::weaken( $self->{obj} ) if $self->{obj}; |
fde3db1a |
84 | |
e0098e7f |
85 | if ( $self->{max_buckets} < 16 ) { |
86 | warn "Floor of max_buckets is 16. Setting it to 16 from '$self->{max_buckets}'\n"; |
87 | $self->{max_buckets} = 16; |
88 | } |
89 | |
260a80b4 |
90 | return $self; |
91 | } |
92 | |
460b1067 |
93 | sub _fileobj { return $_[0]{fileobj} } |
460b1067 |
94 | |
260a80b4 |
95 | sub calculate_sizes { |
96 | my $self = shift; |
97 | |
633df1fd |
98 | # The 2**8 here indicates the number of different characters in the |
99 | # current hashing algorithm |
28394a1a |
100 | #XXX Does this need to be updated with different hashing algorithms? |
ea2f6d67 |
101 | $self->{hash_chars_used} = (2**8); |
102 | $self->{index_size} = $self->{hash_chars_used} * $self->{long_size}; |
103 | |
104 | $self->{bucket_size} = $self->{hash_size} + $self->{long_size} * 2; |
e0098e7f |
105 | $self->{bucket_list_size} = $self->{max_buckets} * $self->{bucket_size}; |
612969fb |
106 | |
ea2f6d67 |
107 | $self->{key_size} = $self->{long_size} * 2; |
108 | $self->{keyloc_size} = $self->{max_buckets} * $self->{key_size}; |
109 | |
260a80b4 |
110 | return; |
1bf65be7 |
111 | } |
112 | |
fde3db1a |
113 | sub write_file_header { |
0d0f3d5d |
114 | my $self = shift; |
0d0f3d5d |
115 | |
eff6a245 |
116 | my $loc = $self->_fileobj->request_space( length( SIG_FILE ) + 33 ); |
0d0f3d5d |
117 | |
019404df |
118 | $self->_fileobj->print_at( $loc, |
260a80b4 |
119 | SIG_FILE, |
460b1067 |
120 | SIG_HEADER, |
121 | pack('N', 1), # header version |
eff6a245 |
122 | pack('N', 24), # header size |
123 | pack('N4', 0, 0, 0, 0), # currently running transaction IDs |
c9b6d0d8 |
124 | pack('n', $self->{long_size}), |
260a80b4 |
125 | pack('A', $self->{long_pack}), |
c9b6d0d8 |
126 | pack('n', $self->{data_size}), |
260a80b4 |
127 | pack('A', $self->{data_pack}), |
c9b6d0d8 |
128 | pack('n', $self->{max_buckets}), |
260a80b4 |
129 | ); |
0d0f3d5d |
130 | |
20b7f047 |
131 | $self->_fileobj->set_transaction_offset( 13 ); |
132 | |
0d0f3d5d |
133 | return; |
134 | } |
135 | |
fde3db1a |
136 | sub read_file_header { |
e064ccd1 |
137 | my $self = shift; |
e064ccd1 |
138 | |
7dcefff3 |
139 | my $buffer = $self->_fileobj->read_at( 0, length(SIG_FILE) + 9 ); |
140 | return unless length($buffer); |
460b1067 |
141 | |
142 | my ($file_signature, $sig_header, $header_version, $size) = unpack( |
143 | 'A4 A N N', $buffer |
42f79e07 |
144 | ); |
e064ccd1 |
145 | |
460b1067 |
146 | unless ( $file_signature eq SIG_FILE ) { |
15ba72cc |
147 | $self->_fileobj->close; |
e96daec8 |
148 | $self->_throw_error( "Signature not found -- file is not a Deep DB" ); |
460b1067 |
149 | } |
260a80b4 |
150 | |
460b1067 |
151 | unless ( $sig_header eq SIG_HEADER ) { |
15ba72cc |
152 | $self->_fileobj->close; |
e96daec8 |
153 | $self->_throw_error( "Old file version found." ); |
460b1067 |
154 | } |
9b2370e0 |
155 | |
7dcefff3 |
156 | my $buffer2 = $self->_fileobj->read_at( undef, $size ); |
eff6a245 |
157 | my ($a1, $a2, $a3, $a4, @values) = unpack( 'N4 n A n A n', $buffer2 ); |
15ba72cc |
158 | |
159 | $self->_fileobj->set_transaction_offset( 13 ); |
160 | |
460b1067 |
161 | if ( @values < 5 || grep { !defined } @values ) { |
15ba72cc |
162 | $self->_fileobj->close; |
e96daec8 |
163 | $self->_throw_error("Corrupted file - bad header"); |
e064ccd1 |
164 | } |
165 | |
460b1067 |
166 | #XXX Add warnings if values weren't set right |
167 | @{$self}{qw(long_size long_pack data_size data_pack max_buckets)} = @values; |
168 | |
7dcefff3 |
169 | return length($buffer) + length($buffer2); |
e064ccd1 |
170 | } |
171 | |
460b1067 |
172 | sub setup_fh { |
173 | my $self = shift; |
174 | my ($obj) = @_; |
70b55428 |
175 | |
7dcefff3 |
176 | # Need to remove use of $fh here |
177 | my $fh = $self->_fileobj->{fh}; |
6fde4ed2 |
178 | flock $fh, LOCK_EX; |
118ba343 |
179 | |
260a80b4 |
180 | #XXX The duplication of calculate_sizes needs to go away |
6fde4ed2 |
181 | unless ( $obj->{base_offset} ) { |
e96daec8 |
182 | my $bytes_read = $self->read_file_header; |
118ba343 |
183 | |
260a80b4 |
184 | $self->calculate_sizes; |
185 | |
118ba343 |
186 | ## |
fde3db1a |
187 | # File is empty -- write header and master index |
118ba343 |
188 | ## |
189 | if (!$bytes_read) { |
aa83bc1e |
190 | $self->_fileobj->audit( "# Database created on" ); |
359a01ac |
191 | |
e96daec8 |
192 | $self->write_file_header; |
118ba343 |
193 | |
22e20cce |
194 | $obj->{base_offset} = $self->_fileobj->request_space( |
195 | $self->tag_size( $self->{index_size} ), |
196 | ); |
118ba343 |
197 | |
9e4f83a0 |
198 | $self->write_tag( |
e96daec8 |
199 | $obj->_base_offset, $obj->_type, |
f37c15ab |
200 | chr(0)x$self->{index_size}, |
118ba343 |
201 | ); |
202 | |
203 | # Flush the filehandle |
204 | my $old_fh = select $fh; |
205 | my $old_af = $|; $| = 1; $| = $old_af; |
206 | select $old_fh; |
207 | } |
208 | else { |
209 | $obj->{base_offset} = $bytes_read; |
210 | |
211 | ## |
fde3db1a |
212 | # Get our type from master index header |
118ba343 |
213 | ## |
359a01ac |
214 | my $tag = $self->load_tag($obj->_base_offset); |
215 | unless ( $tag ) { |
216 | flock $fh, LOCK_UN; |
217 | $self->_throw_error("Corrupted file, no master index record"); |
218 | } |
118ba343 |
219 | |
e96daec8 |
220 | unless ($obj->_type eq $tag->{signature}) { |
359a01ac |
221 | flock $fh, LOCK_UN; |
e96daec8 |
222 | $self->_throw_error("File type mismatch"); |
118ba343 |
223 | } |
224 | } |
118ba343 |
225 | } |
260a80b4 |
226 | else { |
227 | $self->calculate_sizes; |
228 | } |
e06824f8 |
229 | |
673464d9 |
230 | #XXX We have to make sure we don't mess up when autoflush isn't turned on |
7dcefff3 |
231 | $self->_fileobj->set_inode; |
70b55428 |
232 | |
6fde4ed2 |
233 | flock $fh, LOCK_UN; |
234 | |
70b55428 |
235 | return 1; |
236 | } |
237 | |
16d1ad9b |
238 | sub tag_size { |
239 | my $self = shift; |
240 | my ($size) = @_; |
241 | return SIG_SIZE + $self->{data_size} + $size; |
242 | } |
243 | |
9e4f83a0 |
244 | sub write_tag { |
20f7b20c |
245 | ## |
246 | # Given offset, signature and content, create tag and write to disk |
247 | ## |
d4b1166e |
248 | my $self = shift; |
e96daec8 |
249 | my ($offset, $sig, $content) = @_; |
f37c15ab |
250 | my $size = length( $content ); |
20f7b20c |
251 | |
7dcefff3 |
252 | $self->_fileobj->print_at( |
253 | $offset, |
254 | $sig, pack($self->{data_pack}, $size), $content, |
255 | ); |
20f7b20c |
256 | |
f37c15ab |
257 | return unless defined $offset; |
258 | |
20f7b20c |
259 | return { |
260 | signature => $sig, |
72e315ac |
261 | #XXX Is this even used? |
86867f3a |
262 | size => $size, |
263 | offset => $offset + SIG_SIZE + $self->{data_size}, |
264 | content => $content |
20f7b20c |
265 | }; |
d4b1166e |
266 | } |
267 | |
268 | sub load_tag { |
20f7b20c |
269 | ## |
270 | # Given offset, load single tag and return signature, size and data |
271 | ## |
d4b1166e |
272 | my $self = shift; |
e96daec8 |
273 | my ($offset) = @_; |
20f7b20c |
274 | |
7dcefff3 |
275 | my $fileobj = $self->_fileobj; |
20f7b20c |
276 | |
86867f3a |
277 | my ($sig, $size) = unpack( |
278 | "A $self->{data_pack}", |
279 | $fileobj->read_at( $offset, SIG_SIZE + $self->{data_size} ), |
280 | ); |
20f7b20c |
281 | |
282 | return { |
283 | signature => $sig, |
72e315ac |
284 | #XXX Is this even used? |
86867f3a |
285 | size => $size, |
286 | offset => $offset + SIG_SIZE + $self->{data_size}, |
287 | content => $fileobj->read_at( undef, $size ), |
20f7b20c |
288 | }; |
d4b1166e |
289 | } |
290 | |
ea2f6d67 |
291 | sub find_keyloc { |
292 | my $self = shift; |
293 | my ($tag, $transaction_id) = @_; |
294 | $transaction_id = $self->_fileobj->transaction_id |
295 | unless defined $transaction_id; |
296 | |
297 | for ( my $i = 0; $i < $self->{max_buckets}; $i++ ) { |
298 | my ($loc, $trans_id, $is_deleted) = unpack( |
299 | "$self->{long_pack} C C", |
300 | substr( $tag->{content}, $i * $self->{key_size}, $self->{key_size} ), |
301 | ); |
302 | |
303 | if ( $loc == 0 ) { |
304 | return ( $loc, $is_deleted, $i * $self->{key_size} ); |
305 | } |
306 | |
307 | next if $transaction_id != $trans_id; |
308 | |
309 | return ( $loc, $is_deleted, $i * $self->{key_size} ); |
310 | } |
311 | |
312 | return; |
313 | } |
314 | |
20f7b20c |
315 | sub add_bucket { |
316 | ## |
317 | # Adds one key/value pair to bucket list, given offset, MD5 digest of key, |
318 | # plain (undigested) key and value. |
319 | ## |
d4b1166e |
320 | my $self = shift; |
359a01ac |
321 | my ($tag, $md5, $plain_key, $value, $deleted, $orig_key) = @_; |
75be6413 |
322 | |
eea0d863 |
323 | # This verifies that only supported values will be stored. |
324 | { |
325 | my $r = Scalar::Util::reftype( $value ); |
eea0d863 |
326 | |
86867f3a |
327 | last if !defined $r; |
eea0d863 |
328 | last if $r eq 'HASH'; |
329 | last if $r eq 'ARRAY'; |
330 | |
e96daec8 |
331 | $self->_throw_error( |
86867f3a |
332 | "Storage of references of type '$r' is not supported." |
eea0d863 |
333 | ); |
334 | } |
335 | |
019404df |
336 | my $fileobj = $self->_fileobj; |
20f7b20c |
337 | |
21838116 |
338 | #ACID - This is a mutation. Must only find the exact transaction |
ea2f6d67 |
339 | my ($keyloc, $offset) = $self->_find_in_buckets( $tag, $md5, 1 ); |
c9b6d0d8 |
340 | |
341 | my @transactions; |
019404df |
342 | if ( $fileobj->transaction_id == 0 ) { |
343 | @transactions = $fileobj->current_transactions; |
c9b6d0d8 |
344 | } |
75be6413 |
345 | |
e96daec8 |
346 | # $self->_release_space( $size, $subloc ); |
f9c33187 |
347 | #XXX This needs updating to use _release_space |
ea2f6d67 |
348 | |
86867f3a |
349 | my $location; |
ea2f6d67 |
350 | my $size = $self->_length_needed( $value, $plain_key ); |
019404df |
351 | |
ea2f6d67 |
352 | # Updating a known md5 |
353 | if ( $keyloc ) { |
354 | my $keytag = $self->load_tag( $keyloc ); |
355 | my ($subloc, $is_deleted, $offset) = $self->find_keyloc( $keytag ); |
356 | |
357 | if ( @transactions ) { |
358 | my $old_value = $self->read_from_loc( $subloc, $orig_key ); |
359 | my $old_size = $self->_length_needed( $old_value, $plain_key ); |
360 | |
361 | for my $trans_id ( @transactions ) { |
362 | my ($loc, $is_deleted, $offset2) = $self->find_keyloc( $keytag, $trans_id ); |
363 | unless ($loc) { |
364 | my $location2 = $fileobj->request_space( $old_size ); |
365 | $fileobj->print_at( $keytag->{offset} + $offset2, |
366 | pack($self->{long_pack}, $location2 ), |
367 | pack( 'C C', $trans_id, 0 ), |
368 | ); |
369 | $self->write_value( $location2, $plain_key, $old_value, $orig_key ); |
370 | } |
371 | } |
75be6413 |
372 | } |
504185fb |
373 | |
ea2f6d67 |
374 | $location = $self->_fileobj->request_space( $size ); |
375 | #XXX This needs to be transactionally-aware in terms of which keytag->{offset} to use |
376 | $fileobj->print_at( $keytag->{offset} + $offset, |
377 | pack($self->{long_pack}, $location ), |
378 | pack( 'C C', $fileobj->transaction_id, 0 ), |
379 | ); |
75be6413 |
380 | } |
386bab6c |
381 | # Adding a new md5 |
ea2f6d67 |
382 | else { |
383 | my $keyloc = $fileobj->request_space( $self->tag_size( $self->{keyloc_size} ) ); |
386bab6c |
384 | |
ea2f6d67 |
385 | # The bucket fit into list |
386 | if ( defined $offset ) { |
387 | $fileobj->print_at( $tag->{offset} + $offset, |
388 | $md5, pack( $self->{long_pack}, $keyloc ), |
389 | ); |
390 | } |
391 | # If bucket didn't fit into list, split into a new index level |
392 | else { |
393 | $self->split_index( $tag, $md5, $keyloc ); |
394 | } |
395 | |
396 | my $keytag = $self->write_tag( |
397 | $keyloc, SIG_KEYS, chr(0)x$self->{keyloc_size}, |
019404df |
398 | ); |
c9b6d0d8 |
399 | |
ea2f6d67 |
400 | $location = $self->_fileobj->request_space( $size ); |
401 | $fileobj->print_at( $keytag->{offset}, |
402 | pack( $self->{long_pack}, $location ), |
403 | pack( 'C C', $fileobj->transaction_id, 0 ), |
404 | ); |
405 | |
406 | my $offset = 1; |
407 | for my $trans_id ( @transactions ) { |
408 | $fileobj->print_at( $keytag->{offset} + $self->{key_size} * $offset++, |
409 | pack( $self->{long_pack}, -1 ), |
410 | pack( 'C C', $trans_id, 1 ), |
411 | ); |
c9b6d0d8 |
412 | } |
386bab6c |
413 | } |
20f7b20c |
414 | |
359a01ac |
415 | $self->write_value( $location, $plain_key, $value, $orig_key ); |
d5d7c51d |
416 | |
86867f3a |
417 | return 1; |
d5d7c51d |
418 | } |
419 | |
420 | sub write_value { |
421 | my $self = shift; |
359a01ac |
422 | my ($location, $key, $value, $orig_key) = @_; |
d5d7c51d |
423 | |
7dcefff3 |
424 | my $fileobj = $self->_fileobj; |
d5d7c51d |
425 | |
9d4fa373 |
426 | my $dbm_deep_obj = _get_dbm_object( $value ); |
7dcefff3 |
427 | if ( $dbm_deep_obj && $dbm_deep_obj->_fileobj ne $fileobj ) { |
e96daec8 |
428 | $self->_throw_error( "Cannot cross-reference. Use export() instead" ); |
9d4fa373 |
429 | } |
d5d7c51d |
430 | |
20f7b20c |
431 | ## |
d5d7c51d |
432 | # Write signature based on content type, set content length and write |
433 | # actual value. |
20f7b20c |
434 | ## |
9d4fa373 |
435 | my $r = Scalar::Util::reftype( $value ) || ''; |
436 | if ( $dbm_deep_obj ) { |
7dcefff3 |
437 | $self->write_tag( $location, SIG_INTERNAL,pack($self->{long_pack}, $dbm_deep_obj->_base_offset) ); |
f37c15ab |
438 | } |
439 | elsif ($r eq 'HASH') { |
9d4fa373 |
440 | if ( !$dbm_deep_obj && tied %{$value} ) { |
e96daec8 |
441 | $self->_throw_error( "Cannot store something that is tied" ); |
019ab3a1 |
442 | } |
7dcefff3 |
443 | $self->write_tag( $location, SIG_HASH, chr(0)x$self->{index_size} ); |
f37c15ab |
444 | } |
445 | elsif ($r eq 'ARRAY') { |
9d4fa373 |
446 | if ( !$dbm_deep_obj && tied @{$value} ) { |
e96daec8 |
447 | $self->_throw_error( "Cannot store something that is tied" ); |
019ab3a1 |
448 | } |
7dcefff3 |
449 | $self->write_tag( $location, SIG_ARRAY, chr(0)x$self->{index_size} ); |
f37c15ab |
450 | } |
451 | elsif (!defined($value)) { |
7dcefff3 |
452 | $self->write_tag( $location, SIG_NULL, '' ); |
d5d7c51d |
453 | } |
454 | else { |
7dcefff3 |
455 | $self->write_tag( $location, SIG_DATA, $value ); |
d5d7c51d |
456 | } |
20f7b20c |
457 | |
d5d7c51d |
458 | ## |
459 | # Plain key is stored AFTER value, as keys are typically fetched less often. |
460 | ## |
7dcefff3 |
461 | $fileobj->print_at( undef, pack($self->{data_pack}, length($key)) . $key ); |
20f7b20c |
462 | |
9a187d8c |
463 | # Internal references don't care about autobless |
9d4fa373 |
464 | return 1 if $dbm_deep_obj; |
9a187d8c |
465 | |
d5d7c51d |
466 | ## |
467 | # If value is blessed, preserve class name |
468 | ## |
7dcefff3 |
469 | if ( $fileobj->{autobless} ) { |
633df1fd |
470 | if ( defined( my $c = Scalar::Util::blessed($value) ) ) { |
7dcefff3 |
471 | $fileobj->print_at( undef, chr(1), pack($self->{data_pack}, length($c)) . $c ); |
20f7b20c |
472 | } |
d5d7c51d |
473 | else { |
7dcefff3 |
474 | $fileobj->print_at( undef, chr(0) ); |
20f7b20c |
475 | } |
d5d7c51d |
476 | } |
20f7b20c |
477 | |
d5d7c51d |
478 | ## |
56ec4340 |
479 | # Tie the passed in reference so that changes to it are reflected in the |
480 | # datafile. The use of $location as the base_offset will act as the |
481 | # the linkage between parent and child. |
482 | # |
483 | # The overall assignment is a hack around the fact that just tying doesn't |
484 | # store the values. This may not be the wrong thing to do. |
d5d7c51d |
485 | ## |
9d4fa373 |
486 | if ($r eq 'HASH') { |
487 | my %x = %$value; |
488 | tie %$value, 'DBM::Deep', { |
489 | base_offset => $location, |
7dcefff3 |
490 | fileobj => $fileobj, |
359a01ac |
491 | parent => $self->{obj}, |
492 | parent_key => $orig_key, |
9d4fa373 |
493 | }; |
494 | %$value = %x; |
495 | } |
496 | elsif ($r eq 'ARRAY') { |
497 | my @x = @$value; |
498 | tie @$value, 'DBM::Deep', { |
499 | base_offset => $location, |
7dcefff3 |
500 | fileobj => $fileobj, |
359a01ac |
501 | parent => $self->{obj}, |
502 | parent_key => $orig_key, |
9d4fa373 |
503 | }; |
504 | @$value = @x; |
20f7b20c |
505 | } |
d4b1166e |
506 | |
d5d7c51d |
507 | return 1; |
d4b1166e |
508 | } |
509 | |
75be6413 |
510 | sub split_index { |
511 | my $self = shift; |
ea2f6d67 |
512 | my ($tag, $md5, $keyloc) = @_; |
75be6413 |
513 | |
019404df |
514 | my $fileobj = $self->_fileobj; |
21838116 |
515 | |
019404df |
516 | my $loc = $fileobj->request_space( |
e96daec8 |
517 | $self->tag_size( $self->{index_size} ), |
16d1ad9b |
518 | ); |
519 | |
019404df |
520 | $fileobj->print_at( $tag->{ref_loc}, pack($self->{long_pack}, $loc) ); |
75be6413 |
521 | |
9e4f83a0 |
522 | my $index_tag = $self->write_tag( |
e96daec8 |
523 | $loc, SIG_INDEX, |
f37c15ab |
524 | chr(0)x$self->{index_size}, |
75be6413 |
525 | ); |
526 | |
7b1e1aa1 |
527 | my $keys = $tag->{content} |
ea2f6d67 |
528 | . $md5 . pack($self->{long_pack}, $keyloc); |
75be6413 |
529 | |
f9c33187 |
530 | my @newloc = (); |
75be6413 |
531 | BUCKET: |
633df1fd |
532 | # The <= here is deliberate - we have max_buckets+1 keys to iterate |
533 | # through, unlike every other loop that uses max_buckets as a stop. |
75be6413 |
534 | for (my $i = 0; $i <= $self->{max_buckets}; $i++) { |
ea2f6d67 |
535 | my ($key, $old_subloc) = $self->_get_key_subloc( $keys, $i ); |
75be6413 |
536 | |
f9c33187 |
537 | die "[INTERNAL ERROR]: No key in split_index()\n" unless $key; |
538 | die "[INTERNAL ERROR]: No subloc in split_index()\n" unless $old_subloc; |
75be6413 |
539 | |
75be6413 |
540 | my $num = ord(substr($key, $tag->{ch} + 1, 1)); |
541 | |
f9c33187 |
542 | if ($newloc[$num]) { |
7dcefff3 |
543 | my $subkeys = $fileobj->read_at( $newloc[$num], $self->{bucket_list_size} ); |
75be6413 |
544 | |
f9c33187 |
545 | # This is looking for the first empty spot |
ea2f6d67 |
546 | my ($subloc, $offset) = $self->_find_in_buckets( |
f9c33187 |
547 | { content => $subkeys }, '', |
7b1e1aa1 |
548 | ); |
75be6413 |
549 | |
633df1fd |
550 | $fileobj->print_at( |
551 | $newloc[$num] + $offset, |
552 | $key, pack($self->{long_pack}, $old_subloc), |
553 | ); |
7b1e1aa1 |
554 | |
555 | next; |
75be6413 |
556 | } |
75be6413 |
557 | |
019404df |
558 | my $loc = $fileobj->request_space( |
e96daec8 |
559 | $self->tag_size( $self->{bucket_list_size} ), |
7b1e1aa1 |
560 | ); |
2603d86e |
561 | |
019404df |
562 | $fileobj->print_at( |
563 | $index_tag->{offset} + ($num * $self->{long_size}), |
564 | pack($self->{long_pack}, $loc), |
565 | ); |
75be6413 |
566 | |
7b1e1aa1 |
567 | my $blist_tag = $self->write_tag( |
e96daec8 |
568 | $loc, SIG_BLIST, |
7b1e1aa1 |
569 | chr(0)x$self->{bucket_list_size}, |
570 | ); |
571 | |
019404df |
572 | $fileobj->print_at( $blist_tag->{offset}, $key . pack($self->{long_pack}, $old_subloc) ); |
7b1e1aa1 |
573 | |
f9c33187 |
574 | $newloc[$num] = $blist_tag->{offset}; |
7b1e1aa1 |
575 | } |
576 | |
577 | $self->_release_space( |
e96daec8 |
578 | $self->tag_size( $self->{bucket_list_size} ), |
7b1e1aa1 |
579 | $tag->{offset} - SIG_SIZE - $self->{data_size}, |
580 | ); |
75be6413 |
581 | |
ea2f6d67 |
582 | return 1; |
75be6413 |
583 | } |
584 | |
8db25060 |
585 | sub read_from_loc { |
586 | my $self = shift; |
359a01ac |
587 | my ($subloc, $orig_key) = @_; |
8db25060 |
588 | |
7dcefff3 |
589 | my $fileobj = $self->_fileobj; |
8db25060 |
590 | |
7dcefff3 |
591 | my $signature = $fileobj->read_at( $subloc, SIG_SIZE ); |
8db25060 |
592 | |
593 | ## |
594 | # If value is a hash or array, return new DBM::Deep object with correct offset |
595 | ## |
596 | if (($signature eq SIG_HASH) || ($signature eq SIG_ARRAY)) { |
685e40f1 |
597 | my $new_obj = DBM::Deep->new({ |
359a01ac |
598 | type => $signature, |
8db25060 |
599 | base_offset => $subloc, |
e96daec8 |
600 | fileobj => $self->_fileobj, |
359a01ac |
601 | parent => $self->{obj}, |
602 | parent_key => $orig_key, |
685e40f1 |
603 | }); |
8db25060 |
604 | |
460b1067 |
605 | if ($new_obj->_fileobj->{autobless}) { |
8db25060 |
606 | ## |
607 | # Skip over value and plain key to see if object needs |
608 | # to be re-blessed |
609 | ## |
7dcefff3 |
610 | $fileobj->increment_pointer( $self->{data_size} + $self->{index_size} ); |
8db25060 |
611 | |
7dcefff3 |
612 | my $size = $fileobj->read_at( undef, $self->{data_size} ); |
c6ea6b6c |
613 | $size = unpack($self->{data_pack}, $size); |
7dcefff3 |
614 | if ($size) { $fileobj->increment_pointer( $size ); } |
8db25060 |
615 | |
7dcefff3 |
616 | my $bless_bit = $fileobj->read_at( undef, 1 ); |
86867f3a |
617 | if ( ord($bless_bit) ) { |
618 | my $size = unpack( |
619 | $self->{data_pack}, |
620 | $fileobj->read_at( undef, $self->{data_size} ), |
621 | ); |
7dcefff3 |
622 | |
86867f3a |
623 | if ( $size ) { |
624 | $new_obj = bless $new_obj, $fileobj->read_at( undef, $size ); |
625 | } |
8db25060 |
626 | } |
627 | } |
628 | |
685e40f1 |
629 | return $new_obj; |
8db25060 |
630 | } |
631 | elsif ( $signature eq SIG_INTERNAL ) { |
7dcefff3 |
632 | my $size = $fileobj->read_at( undef, $self->{data_size} ); |
8db25060 |
633 | $size = unpack($self->{data_pack}, $size); |
634 | |
635 | if ( $size ) { |
7dcefff3 |
636 | my $new_loc = $fileobj->read_at( undef, $size ); |
637 | $new_loc = unpack( $self->{long_pack}, $new_loc ); |
359a01ac |
638 | return $self->read_from_loc( $new_loc, $orig_key ); |
8db25060 |
639 | } |
640 | else { |
641 | return; |
642 | } |
643 | } |
644 | ## |
645 | # Otherwise return actual value |
646 | ## |
460b1067 |
647 | elsif ( $signature eq SIG_DATA ) { |
7dcefff3 |
648 | my $size = $fileobj->read_at( undef, $self->{data_size} ); |
8db25060 |
649 | $size = unpack($self->{data_pack}, $size); |
650 | |
86867f3a |
651 | my $value = $size ? $fileobj->read_at( undef, $size ) : ''; |
8db25060 |
652 | return $value; |
653 | } |
654 | |
655 | ## |
656 | # Key exists, but content is null |
657 | ## |
658 | return; |
659 | } |
660 | |
9020ee8c |
661 | sub get_bucket_value { |
beac1dff |
662 | ## |
663 | # Fetch single value given tag and MD5 digested key. |
664 | ## |
665 | my $self = shift; |
359a01ac |
666 | my ($tag, $md5, $orig_key) = @_; |
9020ee8c |
667 | |
21838116 |
668 | #ACID - This is a read. Can find exact or HEAD |
ea2f6d67 |
669 | my ($keyloc, $offset) = $self->_find_in_buckets( $tag, $md5 ); |
94e8af14 |
670 | |
ea2f6d67 |
671 | if ( !$keyloc ) { |
94e8af14 |
672 | #XXX Need to use real key |
ea2f6d67 |
673 | # $self->add_bucket( $tag, $md5, $orig_key, undef, $orig_key ); |
94e8af14 |
674 | # return; |
675 | } |
ea2f6d67 |
676 | # elsif ( !$is_deleted ) { |
677 | else { |
678 | my $keytag = $self->load_tag( $keyloc ); |
679 | my ($subloc, $is_deleted) = $self->find_keyloc( $keytag ); |
680 | if (!$subloc) { |
681 | ($subloc, $is_deleted) = $self->find_keyloc( $keytag, 0 ); |
682 | } |
683 | if ( $subloc && !$is_deleted ) { |
684 | return $self->read_from_loc( $subloc, $orig_key ); |
685 | } |
386bab6c |
686 | } |
94e8af14 |
687 | |
beac1dff |
688 | return; |
9020ee8c |
689 | } |
ab0e4957 |
690 | |
691 | sub delete_bucket { |
beac1dff |
692 | ## |
693 | # Delete single key/value pair given tag and MD5 digested key. |
694 | ## |
695 | my $self = shift; |
a97c8f67 |
696 | my ($tag, $md5, $orig_key) = @_; |
ab0e4957 |
697 | |
22e20cce |
698 | #ACID - Although this is a mutation, we must find any transaction. |
699 | # This is because we need to mark something as deleted that is in the HEAD. |
ea2f6d67 |
700 | my ($keyloc, $offset) = $self->_find_in_buckets( $tag, $md5 ); |
633df1fd |
701 | |
ea2f6d67 |
702 | return if !$keyloc; |
633df1fd |
703 | |
704 | my $fileobj = $self->_fileobj; |
705 | |
706 | my @transactions; |
707 | if ( $fileobj->transaction_id == 0 ) { |
708 | @transactions = $fileobj->current_transactions; |
709 | } |
710 | |
633df1fd |
711 | if ( $fileobj->transaction_id == 0 ) { |
ea2f6d67 |
712 | my $keytag = $self->load_tag( $keyloc ); |
713 | my ($subloc, $is_deleted, $offset) = $self->find_keyloc( $keytag ); |
633df1fd |
714 | my $value = $self->read_from_loc( $subloc, $orig_key ); |
715 | |
ea2f6d67 |
716 | my $size = $self->_length_needed( $value, $orig_key ); |
717 | |
718 | for my $trans_id ( @transactions ) { |
719 | my ($loc, $is_deleted, $offset2) = $self->find_keyloc( $keytag, $trans_id ); |
720 | unless ($loc) { |
721 | my $location2 = $fileobj->request_space( $size ); |
722 | $fileobj->print_at( $keytag->{offset} + $offset2, |
723 | pack($self->{long_pack}, $location2 ), |
724 | pack( 'C C', $trans_id, 0 ), |
725 | ); |
726 | $self->write_value( $location2, $orig_key, $value, $orig_key ); |
727 | } |
633df1fd |
728 | } |
729 | |
ea2f6d67 |
730 | $keytag = $self->load_tag( $keyloc ); |
731 | ($subloc, $is_deleted, $offset) = $self->find_keyloc( $keytag ); |
732 | $fileobj->print_at( $keytag->{offset} + $offset, |
733 | substr( $keytag->{content}, $offset + $self->{key_size} ), |
734 | chr(0) x $self->{key_size}, |
019404df |
735 | ); |
386bab6c |
736 | } |
633df1fd |
737 | else { |
ea2f6d67 |
738 | my $keytag = $self->load_tag( $keyloc ); |
739 | my ($subloc, $is_deleted, $offset) = $self->find_keyloc( $keytag ); |
740 | $fileobj->print_at( $keytag->{offset} + $offset, |
741 | pack($self->{long_pack}, -1 ), |
742 | pack( 'C C', $fileobj->transaction_id, 1 ), |
743 | ); |
633df1fd |
744 | } |
745 | |
746 | return 1; |
ab0e4957 |
747 | } |
748 | |
912d50b1 |
749 | sub bucket_exists { |
beac1dff |
750 | ## |
751 | # Check existence of single key given tag and MD5 digested key. |
752 | ## |
753 | my $self = shift; |
e96daec8 |
754 | my ($tag, $md5) = @_; |
912d50b1 |
755 | |
21838116 |
756 | #ACID - This is a read. Can find exact or HEAD |
ea2f6d67 |
757 | my ($keyloc) = $self->_find_in_buckets( $tag, $md5 ); |
758 | my $keytag = $self->load_tag( $keyloc ); |
759 | my ($subloc, $is_deleted, $offset) = $self->find_keyloc( $keytag ); |
760 | if ( !$subloc ) { |
761 | ($subloc, $is_deleted, $offset) = $self->find_keyloc( $keytag, 0 ); |
762 | } |
c9b6d0d8 |
763 | return ($subloc && !$is_deleted) && 1; |
912d50b1 |
764 | } |
765 | |
72e315ac |
766 | sub find_blist { |
beac1dff |
767 | ## |
768 | # Locate offset for bucket list, given digested key |
769 | ## |
770 | my $self = shift; |
e96daec8 |
771 | my ($offset, $md5, $args) = @_; |
d0b74c17 |
772 | $args = {} unless $args; |
773 | |
beac1dff |
774 | ## |
775 | # Locate offset for bucket list using digest index system |
776 | ## |
e96daec8 |
777 | my $tag = $self->load_tag( $offset ) |
778 | or $self->_throw_error( "INTERNAL ERROR - Cannot find tag" ); |
d0b74c17 |
779 | |
e5fc7e69 |
780 | my $ch = 0; |
8db25060 |
781 | while ($tag->{signature} ne SIG_BLIST) { |
d0b74c17 |
782 | my $num = ord substr($md5, $ch, 1); |
783 | |
784 | my $ref_loc = $tag->{offset} + ($num * $self->{long_size}); |
e96daec8 |
785 | $tag = $self->index_lookup( $tag, $num ); |
d0b74c17 |
786 | |
787 | if (!$tag) { |
29b01632 |
788 | return if !$args->{create}; |
d0b74c17 |
789 | |
019404df |
790 | my $loc = $self->_fileobj->request_space( |
e96daec8 |
791 | $self->tag_size( $self->{bucket_list_size} ), |
16d1ad9b |
792 | ); |
793 | |
019404df |
794 | $self->_fileobj->print_at( $ref_loc, pack($self->{long_pack}, $loc) ); |
d0b74c17 |
795 | |
9e4f83a0 |
796 | $tag = $self->write_tag( |
e96daec8 |
797 | $loc, SIG_BLIST, |
f37c15ab |
798 | chr(0)x$self->{bucket_list_size}, |
d5d7c51d |
799 | ); |
800 | |
801 | $tag->{ref_loc} = $ref_loc; |
802 | $tag->{ch} = $ch; |
803 | |
804 | last; |
d0b74c17 |
805 | } |
806 | |
16d1ad9b |
807 | $tag->{ch} = $ch++; |
d0b74c17 |
808 | $tag->{ref_loc} = $ref_loc; |
beac1dff |
809 | } |
d0b74c17 |
810 | |
beac1dff |
811 | return $tag; |
6736c116 |
812 | } |
813 | |
d0b74c17 |
814 | sub index_lookup { |
815 | ## |
816 | # Given index tag, lookup single entry in index and return . |
817 | ## |
818 | my $self = shift; |
e96daec8 |
819 | my ($tag, $index) = @_; |
d0b74c17 |
820 | |
821 | my $location = unpack( |
822 | $self->{long_pack}, |
823 | substr( |
824 | $tag->{content}, |
825 | $index * $self->{long_size}, |
826 | $self->{long_size}, |
827 | ), |
828 | ); |
829 | |
830 | if (!$location) { return; } |
831 | |
e96daec8 |
832 | return $self->load_tag( $location ); |
d0b74c17 |
833 | } |
834 | |
6736c116 |
835 | sub traverse_index { |
beac1dff |
836 | ## |
837 | # Scan index and recursively step into deeper levels, looking for next key. |
838 | ## |
6736c116 |
839 | my $self = shift; |
ea2f6d67 |
840 | my ($xxxx, $offset, $ch, $force_return_next) = @_; |
d0b74c17 |
841 | |
e96daec8 |
842 | my $tag = $self->load_tag( $offset ); |
6736c116 |
843 | |
8db25060 |
844 | if ($tag->{signature} ne SIG_BLIST) { |
ea2f6d67 |
845 | my $start = $xxxx->{return_next} ? 0 : ord(substr($xxxx->{prev_md5}, $ch, 1)); |
d0b74c17 |
846 | |
ea2f6d67 |
847 | for (my $idx = $start; $idx < $self->{hash_chars_used}; $idx++) { |
e5fc7e69 |
848 | my $subloc = unpack( |
849 | $self->{long_pack}, |
e06824f8 |
850 | substr( |
ea2f6d67 |
851 | $tag->{content}, |
e06824f8 |
852 | $idx * $self->{long_size}, |
853 | $self->{long_size}, |
854 | ), |
e5fc7e69 |
855 | ); |
856 | |
beac1dff |
857 | if ($subloc) { |
e5fc7e69 |
858 | my $result = $self->traverse_index( |
ea2f6d67 |
859 | $xxxx, $subloc, $ch + 1, $force_return_next, |
e5fc7e69 |
860 | ); |
861 | |
ea2f6d67 |
862 | if (defined $result) { return $result; } |
beac1dff |
863 | } |
864 | } # index loop |
d0b74c17 |
865 | |
ea2f6d67 |
866 | $xxxx->{return_next} = 1; |
42717e46 |
867 | } |
868 | # This is the bucket list |
e5fc7e69 |
869 | else { |
beac1dff |
870 | my $keys = $tag->{content}; |
ea2f6d67 |
871 | if ($force_return_next) { $xxxx->{return_next} = 1; } |
d0b74c17 |
872 | |
beac1dff |
873 | ## |
874 | # Iterate through buckets, looking for a key match |
875 | ## |
42717e46 |
876 | my $transaction_id = $self->_fileobj->transaction_id; |
8db25060 |
877 | for (my $i = 0; $i < $self->{max_buckets}; $i++) { |
ea2f6d67 |
878 | my ($key, $keyloc) = $self->_get_key_subloc( $keys, $i ); |
d0b74c17 |
879 | |
8db25060 |
880 | # End of bucket list -- return to outer loop |
ea2f6d67 |
881 | if (!$keyloc) { |
882 | $xxxx->{return_next} = 1; |
beac1dff |
883 | last; |
884 | } |
8db25060 |
885 | # Located previous key -- return next one found |
ea2f6d67 |
886 | elsif ($key eq $xxxx->{prev_md5}) { |
887 | $xxxx->{return_next} = 1; |
beac1dff |
888 | next; |
889 | } |
8db25060 |
890 | # Seek to bucket location and skip over signature |
ea2f6d67 |
891 | elsif ($xxxx->{return_next}) { |
7dcefff3 |
892 | my $fileobj = $self->_fileobj; |
d0b74c17 |
893 | |
ea2f6d67 |
894 | my $keytag = $self->load_tag( $keyloc ); |
895 | my ($subloc, $is_deleted) = $self->find_keyloc( $keytag ); |
896 | if ( $subloc == 0 ) { |
897 | ($subloc, $is_deleted) = $self->find_keyloc( $keytag, 0 ); |
898 | } |
899 | next if $is_deleted; |
900 | |
beac1dff |
901 | # Skip over value to get to plain key |
7dcefff3 |
902 | my $sig = $fileobj->read_at( $subloc, SIG_SIZE ); |
8db25060 |
903 | |
7dcefff3 |
904 | my $size = $fileobj->read_at( undef, $self->{data_size} ); |
e5fc7e69 |
905 | $size = unpack($self->{data_pack}, $size); |
7dcefff3 |
906 | if ($size) { $fileobj->increment_pointer( $size ); } |
d0b74c17 |
907 | |
beac1dff |
908 | # Read in plain key and return as scalar |
7dcefff3 |
909 | $size = $fileobj->read_at( undef, $self->{data_size} ); |
e5fc7e69 |
910 | $size = unpack($self->{data_pack}, $size); |
86867f3a |
911 | |
7dcefff3 |
912 | my $plain_key; |
913 | if ($size) { $plain_key = $fileobj->read_at( undef, $size); } |
beac1dff |
914 | return $plain_key; |
915 | } |
8db25060 |
916 | } |
d0b74c17 |
917 | |
ea2f6d67 |
918 | $xxxx->{return_next} = 1; |
42717e46 |
919 | } |
d0b74c17 |
920 | |
beac1dff |
921 | return; |
6736c116 |
922 | } |
923 | |
924 | sub get_next_key { |
beac1dff |
925 | ## |
926 | # Locate next key, given digested previous one |
927 | ## |
6736c116 |
928 | my $self = shift; |
929 | my ($obj) = @_; |
d0b74c17 |
930 | |
beac1dff |
931 | ## |
932 | # If the previous key was not specifed, start at the top and |
933 | # return the first one found. |
934 | ## |
ea2f6d67 |
935 | my $temp; |
936 | if ( @_ > 1 ) { |
937 | $temp = { |
938 | prev_md5 => $_[1], |
939 | return_next => 0, |
940 | }; |
941 | } |
942 | else { |
943 | $temp = { |
944 | prev_md5 => chr(0) x $self->{hash_size}, |
945 | return_next => 1, |
946 | }; |
beac1dff |
947 | } |
d0b74c17 |
948 | |
ea2f6d67 |
949 | return $self->traverse_index( $temp, $obj->_base_offset, 0 ); |
6736c116 |
950 | } |
951 | |
75be6413 |
952 | # Utilities |
953 | |
9cec1360 |
954 | sub _get_key_subloc { |
75be6413 |
955 | my $self = shift; |
956 | my ($keys, $idx) = @_; |
957 | |
ea2f6d67 |
958 | return unpack( |
28394a1a |
959 | # This is 'a', not 'A'. Please read the pack() documentation for the |
960 | # difference between the two and why it's important. |
ea2f6d67 |
961 | "a$self->{hash_size} $self->{long_pack}", |
75be6413 |
962 | substr( |
963 | $keys, |
9cec1360 |
964 | ($idx * $self->{bucket_size}), |
965 | $self->{bucket_size}, |
75be6413 |
966 | ), |
967 | ); |
75be6413 |
968 | } |
969 | |
d608b06e |
970 | sub _find_in_buckets { |
971 | my $self = shift; |
ea2f6d67 |
972 | my ($tag, $md5) = @_; |
21838116 |
973 | |
d608b06e |
974 | BUCKET: |
975 | for ( my $i = 0; $i < $self->{max_buckets}; $i++ ) { |
ea2f6d67 |
976 | my ($key, $subloc) = $self->_get_key_subloc( |
9a187d8c |
977 | $tag->{content}, $i, |
978 | ); |
d608b06e |
979 | |
ea2f6d67 |
980 | my @rv = ($subloc, $i * $self->{bucket_size}); |
21838116 |
981 | |
982 | unless ( $subloc ) { |
21838116 |
983 | return @rv; |
984 | } |
985 | |
986 | next BUCKET if $key ne $md5; |
d608b06e |
987 | |
21838116 |
988 | return @rv; |
d608b06e |
989 | } |
990 | |
991 | return; |
992 | } |
993 | |
994ccd8e |
994 | sub _release_space { |
995 | my $self = shift; |
e96daec8 |
996 | my ($size, $loc) = @_; |
994ccd8e |
997 | |
7b1e1aa1 |
998 | my $next_loc = 0; |
999 | |
019404df |
1000 | $self->_fileobj->print_at( $loc, |
1001 | SIG_FREE, |
1002 | pack($self->{long_pack}, $size ), |
1003 | pack($self->{long_pack}, $next_loc ), |
7b1e1aa1 |
1004 | ); |
1005 | |
994ccd8e |
1006 | return; |
1007 | } |
1008 | |
e96daec8 |
1009 | sub _throw_error { |
1010 | die "DBM::Deep: $_[1]\n"; |
1011 | } |
1012 | |
86867f3a |
1013 | sub _get_dbm_object { |
1014 | my $item = shift; |
1015 | |
1016 | my $obj = eval { |
1017 | local $SIG{__DIE__}; |
1018 | if ($item->isa( 'DBM::Deep' )) { |
1019 | return $item; |
1020 | } |
1021 | return; |
1022 | }; |
1023 | return $obj if $obj; |
1024 | |
1025 | my $r = Scalar::Util::reftype( $item ) || ''; |
1026 | if ( $r eq 'HASH' ) { |
1027 | my $obj = eval { |
1028 | local $SIG{__DIE__}; |
1029 | my $obj = tied(%$item); |
1030 | if ($obj->isa( 'DBM::Deep' )) { |
1031 | return $obj; |
1032 | } |
1033 | return; |
1034 | }; |
1035 | return $obj if $obj; |
1036 | } |
1037 | elsif ( $r eq 'ARRAY' ) { |
1038 | my $obj = eval { |
1039 | local $SIG{__DIE__}; |
1040 | my $obj = tied(@$item); |
1041 | if ($obj->isa( 'DBM::Deep' )) { |
1042 | return $obj; |
1043 | } |
1044 | return; |
1045 | }; |
1046 | return $obj if $obj; |
1047 | } |
1048 | |
1049 | return; |
1050 | } |
1051 | |
1052 | sub _length_needed { |
1053 | my $self = shift; |
1054 | my ($value, $key) = @_; |
1055 | |
1056 | my $is_dbm_deep = eval { |
1057 | local $SIG{'__DIE__'}; |
1058 | $value->isa( 'DBM::Deep' ); |
1059 | }; |
1060 | |
1061 | my $len = SIG_SIZE |
1062 | + $self->{data_size} # size for value |
1063 | + $self->{data_size} # size for key |
1064 | + length( $key ); # length of key |
1065 | |
1066 | if ( $is_dbm_deep && $value->_fileobj eq $self->_fileobj ) { |
1067 | # long_size is for the internal reference |
1068 | return $len + $self->{long_size}; |
1069 | } |
1070 | |
1071 | if ( $self->_fileobj->{autobless} ) { |
1072 | # This is for the bit saying whether or not this thing is blessed. |
1073 | $len += 1; |
1074 | } |
1075 | |
1076 | my $r = Scalar::Util::reftype( $value ) || ''; |
1077 | unless ( $r eq 'HASH' || $r eq 'ARRAY' ) { |
1078 | if ( defined $value ) { |
1079 | $len += length( $value ); |
1080 | } |
1081 | return $len; |
1082 | } |
1083 | |
1084 | $len += $self->{index_size}; |
1085 | |
1086 | # if autobless is enabled, must also take into consideration |
1087 | # the class name as it is stored after the key. |
1088 | if ( $self->_fileobj->{autobless} ) { |
1089 | my $c = Scalar::Util::blessed($value); |
1090 | if ( defined $c && !$is_dbm_deep ) { |
1091 | $len += $self->{data_size} + length($c); |
1092 | } |
1093 | } |
1094 | |
1095 | return $len; |
1096 | } |
1097 | |
a20d9a3f |
1098 | 1; |
1099 | __END__ |