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 | |
c3aafc14 |
8 | our $VERSION = q(0.99_03); |
86867f3a |
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 |
c3aafc14 |
18 | # |
19 | # * Every method in here assumes that the _fileobj has been appropriately |
20 | # safeguarded. This can be anything from flock() to some sort of manual |
21 | # mutex. But, it's the caller's responsability to make sure that this has |
22 | # been done. |
21838116 |
23 | |
8db25060 |
24 | ## |
25 | # Setup file and tag signatures. These should never change. |
26 | ## |
27 | sub SIG_FILE () { 'DPDB' } |
460b1067 |
28 | sub SIG_HEADER () { 'h' } |
8db25060 |
29 | sub SIG_INTERNAL () { 'i' } |
30 | sub SIG_HASH () { 'H' } |
31 | sub SIG_ARRAY () { 'A' } |
8db25060 |
32 | sub SIG_NULL () { 'N' } |
33 | sub SIG_DATA () { 'D' } |
34 | sub SIG_INDEX () { 'I' } |
35 | sub SIG_BLIST () { 'B' } |
7b1e1aa1 |
36 | sub SIG_FREE () { 'F' } |
86867f3a |
37 | sub SIG_KEYS () { 'K' } |
8db25060 |
38 | sub SIG_SIZE () { 1 } |
39 | |
c3aafc14 |
40 | ################################################################################ |
41 | # |
42 | # This is new code. It is a complete rewrite of the engine based on a new API |
43 | # |
44 | ################################################################################ |
45 | |
46 | sub write_value { |
47 | my $self = shift; |
48 | my ($offset, $key, $value, $orig_key) = @_; |
49 | |
50 | my $dig_key = $self->apply_digest( $key ); |
51 | my $tag = $self->find_blist( $offset, $dig_key, { create => 1 } ); |
52 | return $self->add_bucket( $tag, $dig_key, $key, $value, undef, $orig_key ); |
53 | } |
54 | |
55 | sub read_value { |
56 | my $self = shift; |
e5a9d386 |
57 | my ($offset, $key, $orig_key) = @_; |
c3aafc14 |
58 | |
59 | my $dig_key = $self->apply_digest( $key ); |
e5a9d386 |
60 | my $tag = $self->find_blist( $offset, $dig_key ) or return; |
61 | return $self->get_bucket_value( $tag, $dig_key, $orig_key ); |
c3aafc14 |
62 | } |
63 | |
64 | sub delete_key { |
65 | my $self = shift; |
e5a9d386 |
66 | my ($offset, $key, $orig_key) = @_; |
c3aafc14 |
67 | |
68 | my $dig_key = $self->apply_digest( $key ); |
e5a9d386 |
69 | my $tag = $self->find_blist( $offset, $dig_key ) or return; |
70 | my $value = $self->get_bucket_value( $tag, $dig_key, $orig_key ); |
71 | $self->delete_bucket( $tag, $dig_key, $orig_key ); |
72 | return $value; |
c3aafc14 |
73 | } |
74 | |
75 | sub key_exists { |
76 | my $self = shift; |
77 | my ($offset, $key) = @_; |
78 | |
79 | my $dig_key = $self->apply_digest( $key ); |
e5a9d386 |
80 | # exists() returns the empty string, not undef |
81 | my $tag = $self->find_blist( $offset, $dig_key ) or return ''; |
c3aafc14 |
82 | return $self->bucket_exists( $tag, $dig_key, $key ); |
83 | } |
84 | |
83c43bb5 |
85 | sub get_next_key { |
c3aafc14 |
86 | my $self = shift; |
83c43bb5 |
87 | my ($offset) = @_; |
c3aafc14 |
88 | |
83c43bb5 |
89 | # If the previous key was not specifed, start at the top and |
90 | # return the first one found. |
91 | my $temp; |
92 | if ( @_ > 1 ) { |
93 | $temp = { |
94 | prev_md5 => $self->apply_digest($_[1]), |
95 | return_next => 0, |
96 | }; |
97 | } |
98 | else { |
99 | $temp = { |
100 | prev_md5 => chr(0) x $self->{hash_size}, |
101 | return_next => 1, |
102 | }; |
103 | } |
104 | |
105 | return $self->traverse_index( $temp, $offset, 0 ); |
c3aafc14 |
106 | } |
107 | |
108 | ################################################################################ |
109 | # |
110 | # Below here is the old code. It will be folded into the code above as it can. |
111 | # |
112 | ################################################################################ |
113 | |
612969fb |
114 | sub new { |
115 | my $class = shift; |
116 | my ($args) = @_; |
117 | |
118 | my $self = bless { |
86867f3a |
119 | long_size => 4, |
120 | long_pack => 'N', |
121 | data_size => 4, |
122 | data_pack => 'N', |
251dfd0e |
123 | |
86867f3a |
124 | digest => \&Digest::MD5::md5, |
c3aafc14 |
125 | hash_size => 16, # In bytes |
251dfd0e |
126 | |
81d16922 |
127 | ## |
c3aafc14 |
128 | # Number of buckets per blist before another level of indexing is |
e0098e7f |
129 | # done. Increase this value for slightly greater speed, but larger database |
d5d7c51d |
130 | # files. DO NOT decrease this value below 16, due to risk of recursive |
131 | # reindex overrun. |
81d16922 |
132 | ## |
612969fb |
133 | max_buckets => 16, |
460b1067 |
134 | |
135 | fileobj => undef, |
359a01ac |
136 | obj => undef, |
612969fb |
137 | }, $class; |
138 | |
e0098e7f |
139 | if ( defined $args->{pack_size} ) { |
140 | if ( lc $args->{pack_size} eq 'small' ) { |
141 | $args->{long_size} = 2; |
c9b6d0d8 |
142 | $args->{long_pack} = 'n'; |
e0098e7f |
143 | } |
144 | elsif ( lc $args->{pack_size} eq 'medium' ) { |
145 | $args->{long_size} = 4; |
146 | $args->{long_pack} = 'N'; |
147 | } |
148 | elsif ( lc $args->{pack_size} eq 'large' ) { |
149 | $args->{long_size} = 8; |
150 | $args->{long_pack} = 'Q'; |
151 | } |
152 | else { |
153 | die "Unknown pack_size value: '$args->{pack_size}'\n"; |
154 | } |
155 | } |
156 | |
fde3db1a |
157 | # Grab the parameters we want to use |
158 | foreach my $param ( keys %$self ) { |
159 | next unless exists $args->{$param}; |
3e9498a1 |
160 | $self->{$param} = $args->{$param}; |
fde3db1a |
161 | } |
359a01ac |
162 | Scalar::Util::weaken( $self->{obj} ) if $self->{obj}; |
fde3db1a |
163 | |
e0098e7f |
164 | if ( $self->{max_buckets} < 16 ) { |
165 | warn "Floor of max_buckets is 16. Setting it to 16 from '$self->{max_buckets}'\n"; |
166 | $self->{max_buckets} = 16; |
167 | } |
168 | |
260a80b4 |
169 | return $self; |
170 | } |
171 | |
460b1067 |
172 | sub _fileobj { return $_[0]{fileobj} } |
460b1067 |
173 | |
c3aafc14 |
174 | sub apply_digest { |
175 | my $self = shift; |
176 | return $self->{digest}->(@_); |
177 | } |
178 | |
260a80b4 |
179 | sub calculate_sizes { |
180 | my $self = shift; |
181 | |
633df1fd |
182 | # The 2**8 here indicates the number of different characters in the |
183 | # current hashing algorithm |
28394a1a |
184 | #XXX Does this need to be updated with different hashing algorithms? |
ea2f6d67 |
185 | $self->{hash_chars_used} = (2**8); |
186 | $self->{index_size} = $self->{hash_chars_used} * $self->{long_size}; |
187 | |
188 | $self->{bucket_size} = $self->{hash_size} + $self->{long_size} * 2; |
e0098e7f |
189 | $self->{bucket_list_size} = $self->{max_buckets} * $self->{bucket_size}; |
612969fb |
190 | |
ea2f6d67 |
191 | $self->{key_size} = $self->{long_size} * 2; |
192 | $self->{keyloc_size} = $self->{max_buckets} * $self->{key_size}; |
193 | |
260a80b4 |
194 | return; |
1bf65be7 |
195 | } |
196 | |
fde3db1a |
197 | sub write_file_header { |
0d0f3d5d |
198 | my $self = shift; |
0d0f3d5d |
199 | |
eff6a245 |
200 | my $loc = $self->_fileobj->request_space( length( SIG_FILE ) + 33 ); |
0d0f3d5d |
201 | |
019404df |
202 | $self->_fileobj->print_at( $loc, |
260a80b4 |
203 | SIG_FILE, |
460b1067 |
204 | SIG_HEADER, |
205 | pack('N', 1), # header version |
eff6a245 |
206 | pack('N', 24), # header size |
207 | pack('N4', 0, 0, 0, 0), # currently running transaction IDs |
c9b6d0d8 |
208 | pack('n', $self->{long_size}), |
260a80b4 |
209 | pack('A', $self->{long_pack}), |
c9b6d0d8 |
210 | pack('n', $self->{data_size}), |
260a80b4 |
211 | pack('A', $self->{data_pack}), |
c9b6d0d8 |
212 | pack('n', $self->{max_buckets}), |
260a80b4 |
213 | ); |
0d0f3d5d |
214 | |
20b7f047 |
215 | $self->_fileobj->set_transaction_offset( 13 ); |
216 | |
0d0f3d5d |
217 | return; |
218 | } |
219 | |
fde3db1a |
220 | sub read_file_header { |
e064ccd1 |
221 | my $self = shift; |
e064ccd1 |
222 | |
7dcefff3 |
223 | my $buffer = $self->_fileobj->read_at( 0, length(SIG_FILE) + 9 ); |
224 | return unless length($buffer); |
460b1067 |
225 | |
226 | my ($file_signature, $sig_header, $header_version, $size) = unpack( |
227 | 'A4 A N N', $buffer |
42f79e07 |
228 | ); |
e064ccd1 |
229 | |
460b1067 |
230 | unless ( $file_signature eq SIG_FILE ) { |
15ba72cc |
231 | $self->_fileobj->close; |
e96daec8 |
232 | $self->_throw_error( "Signature not found -- file is not a Deep DB" ); |
460b1067 |
233 | } |
260a80b4 |
234 | |
460b1067 |
235 | unless ( $sig_header eq SIG_HEADER ) { |
15ba72cc |
236 | $self->_fileobj->close; |
e96daec8 |
237 | $self->_throw_error( "Old file version found." ); |
460b1067 |
238 | } |
9b2370e0 |
239 | |
7dcefff3 |
240 | my $buffer2 = $self->_fileobj->read_at( undef, $size ); |
eff6a245 |
241 | my ($a1, $a2, $a3, $a4, @values) = unpack( 'N4 n A n A n', $buffer2 ); |
15ba72cc |
242 | |
243 | $self->_fileobj->set_transaction_offset( 13 ); |
244 | |
460b1067 |
245 | if ( @values < 5 || grep { !defined } @values ) { |
15ba72cc |
246 | $self->_fileobj->close; |
e96daec8 |
247 | $self->_throw_error("Corrupted file - bad header"); |
e064ccd1 |
248 | } |
249 | |
460b1067 |
250 | #XXX Add warnings if values weren't set right |
251 | @{$self}{qw(long_size long_pack data_size data_pack max_buckets)} = @values; |
252 | |
7dcefff3 |
253 | return length($buffer) + length($buffer2); |
e064ccd1 |
254 | } |
255 | |
460b1067 |
256 | sub setup_fh { |
257 | my $self = shift; |
258 | my ($obj) = @_; |
70b55428 |
259 | |
7dcefff3 |
260 | # Need to remove use of $fh here |
261 | my $fh = $self->_fileobj->{fh}; |
6fde4ed2 |
262 | flock $fh, LOCK_EX; |
118ba343 |
263 | |
260a80b4 |
264 | #XXX The duplication of calculate_sizes needs to go away |
6fde4ed2 |
265 | unless ( $obj->{base_offset} ) { |
e96daec8 |
266 | my $bytes_read = $self->read_file_header; |
118ba343 |
267 | |
260a80b4 |
268 | $self->calculate_sizes; |
269 | |
118ba343 |
270 | ## |
fde3db1a |
271 | # File is empty -- write header and master index |
118ba343 |
272 | ## |
273 | if (!$bytes_read) { |
aa83bc1e |
274 | $self->_fileobj->audit( "# Database created on" ); |
359a01ac |
275 | |
e96daec8 |
276 | $self->write_file_header; |
118ba343 |
277 | |
22e20cce |
278 | $obj->{base_offset} = $self->_fileobj->request_space( |
279 | $self->tag_size( $self->{index_size} ), |
280 | ); |
118ba343 |
281 | |
9e4f83a0 |
282 | $self->write_tag( |
e96daec8 |
283 | $obj->_base_offset, $obj->_type, |
f37c15ab |
284 | chr(0)x$self->{index_size}, |
118ba343 |
285 | ); |
286 | |
287 | # Flush the filehandle |
288 | my $old_fh = select $fh; |
289 | my $old_af = $|; $| = 1; $| = $old_af; |
290 | select $old_fh; |
291 | } |
292 | else { |
293 | $obj->{base_offset} = $bytes_read; |
294 | |
295 | ## |
fde3db1a |
296 | # Get our type from master index header |
118ba343 |
297 | ## |
359a01ac |
298 | my $tag = $self->load_tag($obj->_base_offset); |
299 | unless ( $tag ) { |
300 | flock $fh, LOCK_UN; |
301 | $self->_throw_error("Corrupted file, no master index record"); |
302 | } |
118ba343 |
303 | |
e96daec8 |
304 | unless ($obj->_type eq $tag->{signature}) { |
359a01ac |
305 | flock $fh, LOCK_UN; |
e96daec8 |
306 | $self->_throw_error("File type mismatch"); |
118ba343 |
307 | } |
308 | } |
118ba343 |
309 | } |
260a80b4 |
310 | else { |
311 | $self->calculate_sizes; |
312 | } |
e06824f8 |
313 | |
673464d9 |
314 | #XXX We have to make sure we don't mess up when autoflush isn't turned on |
7dcefff3 |
315 | $self->_fileobj->set_inode; |
70b55428 |
316 | |
6fde4ed2 |
317 | flock $fh, LOCK_UN; |
318 | |
70b55428 |
319 | return 1; |
320 | } |
321 | |
16d1ad9b |
322 | sub tag_size { |
323 | my $self = shift; |
324 | my ($size) = @_; |
325 | return SIG_SIZE + $self->{data_size} + $size; |
326 | } |
327 | |
9e4f83a0 |
328 | sub write_tag { |
20f7b20c |
329 | ## |
330 | # Given offset, signature and content, create tag and write to disk |
331 | ## |
d4b1166e |
332 | my $self = shift; |
e96daec8 |
333 | my ($offset, $sig, $content) = @_; |
f37c15ab |
334 | my $size = length( $content ); |
20f7b20c |
335 | |
7dcefff3 |
336 | $self->_fileobj->print_at( |
337 | $offset, |
338 | $sig, pack($self->{data_pack}, $size), $content, |
339 | ); |
20f7b20c |
340 | |
f37c15ab |
341 | return unless defined $offset; |
342 | |
20f7b20c |
343 | return { |
344 | signature => $sig, |
72e315ac |
345 | #XXX Is this even used? |
86867f3a |
346 | size => $size, |
347 | offset => $offset + SIG_SIZE + $self->{data_size}, |
348 | content => $content |
20f7b20c |
349 | }; |
d4b1166e |
350 | } |
351 | |
352 | sub load_tag { |
20f7b20c |
353 | ## |
354 | # Given offset, load single tag and return signature, size and data |
355 | ## |
d4b1166e |
356 | my $self = shift; |
e96daec8 |
357 | my ($offset) = @_; |
20f7b20c |
358 | |
7dcefff3 |
359 | my $fileobj = $self->_fileobj; |
20f7b20c |
360 | |
86867f3a |
361 | my ($sig, $size) = unpack( |
362 | "A $self->{data_pack}", |
363 | $fileobj->read_at( $offset, SIG_SIZE + $self->{data_size} ), |
364 | ); |
20f7b20c |
365 | |
366 | return { |
367 | signature => $sig, |
c3aafc14 |
368 | size => $size, #XXX Is this even used? |
86867f3a |
369 | offset => $offset + SIG_SIZE + $self->{data_size}, |
370 | content => $fileobj->read_at( undef, $size ), |
20f7b20c |
371 | }; |
d4b1166e |
372 | } |
373 | |
ea2f6d67 |
374 | sub find_keyloc { |
375 | my $self = shift; |
376 | my ($tag, $transaction_id) = @_; |
377 | $transaction_id = $self->_fileobj->transaction_id |
378 | unless defined $transaction_id; |
379 | |
380 | for ( my $i = 0; $i < $self->{max_buckets}; $i++ ) { |
381 | my ($loc, $trans_id, $is_deleted) = unpack( |
382 | "$self->{long_pack} C C", |
383 | substr( $tag->{content}, $i * $self->{key_size}, $self->{key_size} ), |
384 | ); |
385 | |
386 | if ( $loc == 0 ) { |
387 | return ( $loc, $is_deleted, $i * $self->{key_size} ); |
388 | } |
389 | |
390 | next if $transaction_id != $trans_id; |
391 | |
392 | return ( $loc, $is_deleted, $i * $self->{key_size} ); |
393 | } |
394 | |
395 | return; |
396 | } |
397 | |
20f7b20c |
398 | sub add_bucket { |
399 | ## |
400 | # Adds one key/value pair to bucket list, given offset, MD5 digest of key, |
401 | # plain (undigested) key and value. |
402 | ## |
d4b1166e |
403 | my $self = shift; |
359a01ac |
404 | my ($tag, $md5, $plain_key, $value, $deleted, $orig_key) = @_; |
75be6413 |
405 | |
eea0d863 |
406 | # This verifies that only supported values will be stored. |
407 | { |
408 | my $r = Scalar::Util::reftype( $value ); |
eea0d863 |
409 | |
86867f3a |
410 | last if !defined $r; |
eea0d863 |
411 | last if $r eq 'HASH'; |
412 | last if $r eq 'ARRAY'; |
413 | |
e96daec8 |
414 | $self->_throw_error( |
86867f3a |
415 | "Storage of references of type '$r' is not supported." |
eea0d863 |
416 | ); |
417 | } |
418 | |
019404df |
419 | my $fileobj = $self->_fileobj; |
20f7b20c |
420 | |
21838116 |
421 | #ACID - This is a mutation. Must only find the exact transaction |
ea2f6d67 |
422 | my ($keyloc, $offset) = $self->_find_in_buckets( $tag, $md5, 1 ); |
c9b6d0d8 |
423 | |
424 | my @transactions; |
019404df |
425 | if ( $fileobj->transaction_id == 0 ) { |
426 | @transactions = $fileobj->current_transactions; |
c9b6d0d8 |
427 | } |
75be6413 |
428 | |
e96daec8 |
429 | # $self->_release_space( $size, $subloc ); |
f9c33187 |
430 | #XXX This needs updating to use _release_space |
ea2f6d67 |
431 | |
86867f3a |
432 | my $location; |
ea2f6d67 |
433 | my $size = $self->_length_needed( $value, $plain_key ); |
019404df |
434 | |
ea2f6d67 |
435 | # Updating a known md5 |
436 | if ( $keyloc ) { |
437 | my $keytag = $self->load_tag( $keyloc ); |
438 | my ($subloc, $is_deleted, $offset) = $self->find_keyloc( $keytag ); |
439 | |
13ff93d5 |
440 | if ( $subloc && !$is_deleted && @transactions ) { |
ea2f6d67 |
441 | my $old_value = $self->read_from_loc( $subloc, $orig_key ); |
442 | my $old_size = $self->_length_needed( $old_value, $plain_key ); |
443 | |
444 | for my $trans_id ( @transactions ) { |
445 | my ($loc, $is_deleted, $offset2) = $self->find_keyloc( $keytag, $trans_id ); |
446 | unless ($loc) { |
447 | my $location2 = $fileobj->request_space( $old_size ); |
448 | $fileobj->print_at( $keytag->{offset} + $offset2, |
449 | pack($self->{long_pack}, $location2 ), |
450 | pack( 'C C', $trans_id, 0 ), |
451 | ); |
c3aafc14 |
452 | $self->_write_value( $location2, $plain_key, $old_value, $orig_key ); |
ea2f6d67 |
453 | } |
454 | } |
75be6413 |
455 | } |
504185fb |
456 | |
ea2f6d67 |
457 | $location = $self->_fileobj->request_space( $size ); |
458 | #XXX This needs to be transactionally-aware in terms of which keytag->{offset} to use |
459 | $fileobj->print_at( $keytag->{offset} + $offset, |
460 | pack($self->{long_pack}, $location ), |
461 | pack( 'C C', $fileobj->transaction_id, 0 ), |
462 | ); |
75be6413 |
463 | } |
386bab6c |
464 | # Adding a new md5 |
ea2f6d67 |
465 | else { |
466 | my $keyloc = $fileobj->request_space( $self->tag_size( $self->{keyloc_size} ) ); |
386bab6c |
467 | |
ea2f6d67 |
468 | # The bucket fit into list |
469 | if ( defined $offset ) { |
470 | $fileobj->print_at( $tag->{offset} + $offset, |
471 | $md5, pack( $self->{long_pack}, $keyloc ), |
472 | ); |
473 | } |
474 | # If bucket didn't fit into list, split into a new index level |
475 | else { |
476 | $self->split_index( $tag, $md5, $keyloc ); |
477 | } |
478 | |
479 | my $keytag = $self->write_tag( |
480 | $keyloc, SIG_KEYS, chr(0)x$self->{keyloc_size}, |
019404df |
481 | ); |
c9b6d0d8 |
482 | |
ea2f6d67 |
483 | $location = $self->_fileobj->request_space( $size ); |
484 | $fileobj->print_at( $keytag->{offset}, |
485 | pack( $self->{long_pack}, $location ), |
486 | pack( 'C C', $fileobj->transaction_id, 0 ), |
487 | ); |
488 | |
489 | my $offset = 1; |
490 | for my $trans_id ( @transactions ) { |
491 | $fileobj->print_at( $keytag->{offset} + $self->{key_size} * $offset++, |
13ff93d5 |
492 | pack( $self->{long_pack}, 0 ), |
ea2f6d67 |
493 | pack( 'C C', $trans_id, 1 ), |
494 | ); |
c9b6d0d8 |
495 | } |
386bab6c |
496 | } |
20f7b20c |
497 | |
c3aafc14 |
498 | $self->_write_value( $location, $plain_key, $value, $orig_key ); |
d5d7c51d |
499 | |
86867f3a |
500 | return 1; |
d5d7c51d |
501 | } |
502 | |
c3aafc14 |
503 | sub _write_value { |
d5d7c51d |
504 | my $self = shift; |
359a01ac |
505 | my ($location, $key, $value, $orig_key) = @_; |
d5d7c51d |
506 | |
7dcefff3 |
507 | my $fileobj = $self->_fileobj; |
d5d7c51d |
508 | |
9d4fa373 |
509 | my $dbm_deep_obj = _get_dbm_object( $value ); |
7dcefff3 |
510 | if ( $dbm_deep_obj && $dbm_deep_obj->_fileobj ne $fileobj ) { |
e96daec8 |
511 | $self->_throw_error( "Cannot cross-reference. Use export() instead" ); |
9d4fa373 |
512 | } |
d5d7c51d |
513 | |
20f7b20c |
514 | ## |
d5d7c51d |
515 | # Write signature based on content type, set content length and write |
516 | # actual value. |
20f7b20c |
517 | ## |
9d4fa373 |
518 | my $r = Scalar::Util::reftype( $value ) || ''; |
519 | if ( $dbm_deep_obj ) { |
7dcefff3 |
520 | $self->write_tag( $location, SIG_INTERNAL,pack($self->{long_pack}, $dbm_deep_obj->_base_offset) ); |
f37c15ab |
521 | } |
522 | elsif ($r eq 'HASH') { |
9d4fa373 |
523 | if ( !$dbm_deep_obj && tied %{$value} ) { |
e96daec8 |
524 | $self->_throw_error( "Cannot store something that is tied" ); |
019ab3a1 |
525 | } |
7dcefff3 |
526 | $self->write_tag( $location, SIG_HASH, chr(0)x$self->{index_size} ); |
f37c15ab |
527 | } |
528 | elsif ($r eq 'ARRAY') { |
9d4fa373 |
529 | if ( !$dbm_deep_obj && tied @{$value} ) { |
e96daec8 |
530 | $self->_throw_error( "Cannot store something that is tied" ); |
019ab3a1 |
531 | } |
7dcefff3 |
532 | $self->write_tag( $location, SIG_ARRAY, chr(0)x$self->{index_size} ); |
f37c15ab |
533 | } |
534 | elsif (!defined($value)) { |
7dcefff3 |
535 | $self->write_tag( $location, SIG_NULL, '' ); |
d5d7c51d |
536 | } |
537 | else { |
7dcefff3 |
538 | $self->write_tag( $location, SIG_DATA, $value ); |
d5d7c51d |
539 | } |
20f7b20c |
540 | |
d5d7c51d |
541 | ## |
542 | # Plain key is stored AFTER value, as keys are typically fetched less often. |
543 | ## |
7dcefff3 |
544 | $fileobj->print_at( undef, pack($self->{data_pack}, length($key)) . $key ); |
20f7b20c |
545 | |
9a187d8c |
546 | # Internal references don't care about autobless |
9d4fa373 |
547 | return 1 if $dbm_deep_obj; |
9a187d8c |
548 | |
d5d7c51d |
549 | ## |
550 | # If value is blessed, preserve class name |
551 | ## |
7dcefff3 |
552 | if ( $fileobj->{autobless} ) { |
633df1fd |
553 | if ( defined( my $c = Scalar::Util::blessed($value) ) ) { |
7dcefff3 |
554 | $fileobj->print_at( undef, chr(1), pack($self->{data_pack}, length($c)) . $c ); |
20f7b20c |
555 | } |
d5d7c51d |
556 | else { |
7dcefff3 |
557 | $fileobj->print_at( undef, chr(0) ); |
20f7b20c |
558 | } |
d5d7c51d |
559 | } |
20f7b20c |
560 | |
d5d7c51d |
561 | ## |
56ec4340 |
562 | # Tie the passed in reference so that changes to it are reflected in the |
563 | # datafile. The use of $location as the base_offset will act as the |
564 | # the linkage between parent and child. |
565 | # |
566 | # The overall assignment is a hack around the fact that just tying doesn't |
567 | # store the values. This may not be the wrong thing to do. |
d5d7c51d |
568 | ## |
9d4fa373 |
569 | if ($r eq 'HASH') { |
570 | my %x = %$value; |
571 | tie %$value, 'DBM::Deep', { |
572 | base_offset => $location, |
7dcefff3 |
573 | fileobj => $fileobj, |
359a01ac |
574 | parent => $self->{obj}, |
575 | parent_key => $orig_key, |
9d4fa373 |
576 | }; |
577 | %$value = %x; |
bd01f6ec |
578 | bless $value, 'DBM::Deep::Hash' unless Scalar::Util::blessed( $value ); |
9d4fa373 |
579 | } |
580 | elsif ($r eq 'ARRAY') { |
581 | my @x = @$value; |
582 | tie @$value, 'DBM::Deep', { |
583 | base_offset => $location, |
7dcefff3 |
584 | fileobj => $fileobj, |
359a01ac |
585 | parent => $self->{obj}, |
586 | parent_key => $orig_key, |
9d4fa373 |
587 | }; |
588 | @$value = @x; |
bd01f6ec |
589 | bless $value, 'DBM::Deep::Array' unless Scalar::Util::blessed( $value ); |
20f7b20c |
590 | } |
d4b1166e |
591 | |
d5d7c51d |
592 | return 1; |
d4b1166e |
593 | } |
594 | |
75be6413 |
595 | sub split_index { |
596 | my $self = shift; |
ea2f6d67 |
597 | my ($tag, $md5, $keyloc) = @_; |
75be6413 |
598 | |
019404df |
599 | my $fileobj = $self->_fileobj; |
21838116 |
600 | |
019404df |
601 | my $loc = $fileobj->request_space( |
e96daec8 |
602 | $self->tag_size( $self->{index_size} ), |
16d1ad9b |
603 | ); |
604 | |
019404df |
605 | $fileobj->print_at( $tag->{ref_loc}, pack($self->{long_pack}, $loc) ); |
75be6413 |
606 | |
9e4f83a0 |
607 | my $index_tag = $self->write_tag( |
e96daec8 |
608 | $loc, SIG_INDEX, |
f37c15ab |
609 | chr(0)x$self->{index_size}, |
75be6413 |
610 | ); |
611 | |
7b1e1aa1 |
612 | my $keys = $tag->{content} |
ea2f6d67 |
613 | . $md5 . pack($self->{long_pack}, $keyloc); |
75be6413 |
614 | |
f9c33187 |
615 | my @newloc = (); |
75be6413 |
616 | BUCKET: |
633df1fd |
617 | # The <= here is deliberate - we have max_buckets+1 keys to iterate |
618 | # through, unlike every other loop that uses max_buckets as a stop. |
75be6413 |
619 | for (my $i = 0; $i <= $self->{max_buckets}; $i++) { |
ea2f6d67 |
620 | my ($key, $old_subloc) = $self->_get_key_subloc( $keys, $i ); |
75be6413 |
621 | |
f9c33187 |
622 | die "[INTERNAL ERROR]: No key in split_index()\n" unless $key; |
623 | die "[INTERNAL ERROR]: No subloc in split_index()\n" unless $old_subloc; |
75be6413 |
624 | |
75be6413 |
625 | my $num = ord(substr($key, $tag->{ch} + 1, 1)); |
626 | |
f9c33187 |
627 | if ($newloc[$num]) { |
7dcefff3 |
628 | my $subkeys = $fileobj->read_at( $newloc[$num], $self->{bucket_list_size} ); |
75be6413 |
629 | |
f9c33187 |
630 | # This is looking for the first empty spot |
ea2f6d67 |
631 | my ($subloc, $offset) = $self->_find_in_buckets( |
f9c33187 |
632 | { content => $subkeys }, '', |
7b1e1aa1 |
633 | ); |
75be6413 |
634 | |
633df1fd |
635 | $fileobj->print_at( |
636 | $newloc[$num] + $offset, |
637 | $key, pack($self->{long_pack}, $old_subloc), |
638 | ); |
7b1e1aa1 |
639 | |
640 | next; |
75be6413 |
641 | } |
75be6413 |
642 | |
019404df |
643 | my $loc = $fileobj->request_space( |
e96daec8 |
644 | $self->tag_size( $self->{bucket_list_size} ), |
7b1e1aa1 |
645 | ); |
2603d86e |
646 | |
019404df |
647 | $fileobj->print_at( |
648 | $index_tag->{offset} + ($num * $self->{long_size}), |
649 | pack($self->{long_pack}, $loc), |
650 | ); |
75be6413 |
651 | |
7b1e1aa1 |
652 | my $blist_tag = $self->write_tag( |
e96daec8 |
653 | $loc, SIG_BLIST, |
7b1e1aa1 |
654 | chr(0)x$self->{bucket_list_size}, |
655 | ); |
656 | |
019404df |
657 | $fileobj->print_at( $blist_tag->{offset}, $key . pack($self->{long_pack}, $old_subloc) ); |
7b1e1aa1 |
658 | |
f9c33187 |
659 | $newloc[$num] = $blist_tag->{offset}; |
7b1e1aa1 |
660 | } |
661 | |
662 | $self->_release_space( |
e96daec8 |
663 | $self->tag_size( $self->{bucket_list_size} ), |
7b1e1aa1 |
664 | $tag->{offset} - SIG_SIZE - $self->{data_size}, |
665 | ); |
75be6413 |
666 | |
ea2f6d67 |
667 | return 1; |
75be6413 |
668 | } |
669 | |
8db25060 |
670 | sub read_from_loc { |
671 | my $self = shift; |
359a01ac |
672 | my ($subloc, $orig_key) = @_; |
8db25060 |
673 | |
7dcefff3 |
674 | my $fileobj = $self->_fileobj; |
8db25060 |
675 | |
7dcefff3 |
676 | my $signature = $fileobj->read_at( $subloc, SIG_SIZE ); |
8db25060 |
677 | |
678 | ## |
679 | # If value is a hash or array, return new DBM::Deep object with correct offset |
680 | ## |
681 | if (($signature eq SIG_HASH) || ($signature eq SIG_ARRAY)) { |
c3aafc14 |
682 | #XXX This needs to be a singleton |
bd01f6ec |
683 | # my $new_obj; |
684 | # my $is_autobless; |
685 | # if ( $signature eq SIG_HASH ) { |
686 | # $new_obj = {}; |
687 | # tie %$new_obj, 'DBM::Deep', { |
688 | # base_offset => $subloc, |
689 | # fileobj => $self->_fileobj, |
690 | # parent => $self->{obj}, |
691 | # parent_key => $orig_key, |
692 | # }; |
693 | # $is_autobless = tied(%$new_obj)->_fileobj->{autobless}; |
694 | # } |
695 | # else { |
696 | # $new_obj = []; |
697 | # tie @$new_obj, 'DBM::Deep', { |
698 | # base_offset => $subloc, |
699 | # fileobj => $self->_fileobj, |
700 | # parent => $self->{obj}, |
701 | # parent_key => $orig_key, |
702 | # }; |
703 | # $is_autobless = tied(@$new_obj)->_fileobj->{autobless}; |
704 | # } |
705 | # |
706 | # if ($is_autobless) { |
707 | |
685e40f1 |
708 | my $new_obj = DBM::Deep->new({ |
359a01ac |
709 | type => $signature, |
8db25060 |
710 | base_offset => $subloc, |
e96daec8 |
711 | fileobj => $self->_fileobj, |
359a01ac |
712 | parent => $self->{obj}, |
713 | parent_key => $orig_key, |
685e40f1 |
714 | }); |
8db25060 |
715 | |
460b1067 |
716 | if ($new_obj->_fileobj->{autobless}) { |
8db25060 |
717 | ## |
718 | # Skip over value and plain key to see if object needs |
719 | # to be re-blessed |
720 | ## |
7dcefff3 |
721 | $fileobj->increment_pointer( $self->{data_size} + $self->{index_size} ); |
8db25060 |
722 | |
7dcefff3 |
723 | my $size = $fileobj->read_at( undef, $self->{data_size} ); |
c6ea6b6c |
724 | $size = unpack($self->{data_pack}, $size); |
7dcefff3 |
725 | if ($size) { $fileobj->increment_pointer( $size ); } |
8db25060 |
726 | |
7dcefff3 |
727 | my $bless_bit = $fileobj->read_at( undef, 1 ); |
86867f3a |
728 | if ( ord($bless_bit) ) { |
729 | my $size = unpack( |
730 | $self->{data_pack}, |
731 | $fileobj->read_at( undef, $self->{data_size} ), |
732 | ); |
7dcefff3 |
733 | |
86867f3a |
734 | if ( $size ) { |
735 | $new_obj = bless $new_obj, $fileobj->read_at( undef, $size ); |
736 | } |
8db25060 |
737 | } |
738 | } |
739 | |
685e40f1 |
740 | return $new_obj; |
8db25060 |
741 | } |
742 | elsif ( $signature eq SIG_INTERNAL ) { |
7dcefff3 |
743 | my $size = $fileobj->read_at( undef, $self->{data_size} ); |
8db25060 |
744 | $size = unpack($self->{data_pack}, $size); |
745 | |
746 | if ( $size ) { |
7dcefff3 |
747 | my $new_loc = $fileobj->read_at( undef, $size ); |
748 | $new_loc = unpack( $self->{long_pack}, $new_loc ); |
359a01ac |
749 | return $self->read_from_loc( $new_loc, $orig_key ); |
8db25060 |
750 | } |
751 | else { |
752 | return; |
753 | } |
754 | } |
755 | ## |
756 | # Otherwise return actual value |
757 | ## |
460b1067 |
758 | elsif ( $signature eq SIG_DATA ) { |
7dcefff3 |
759 | my $size = $fileobj->read_at( undef, $self->{data_size} ); |
8db25060 |
760 | $size = unpack($self->{data_pack}, $size); |
761 | |
86867f3a |
762 | my $value = $size ? $fileobj->read_at( undef, $size ) : ''; |
8db25060 |
763 | return $value; |
764 | } |
765 | |
766 | ## |
767 | # Key exists, but content is null |
768 | ## |
769 | return; |
770 | } |
771 | |
9020ee8c |
772 | sub get_bucket_value { |
beac1dff |
773 | ## |
774 | # Fetch single value given tag and MD5 digested key. |
775 | ## |
776 | my $self = shift; |
359a01ac |
777 | my ($tag, $md5, $orig_key) = @_; |
9020ee8c |
778 | |
21838116 |
779 | #ACID - This is a read. Can find exact or HEAD |
ea2f6d67 |
780 | my ($keyloc, $offset) = $self->_find_in_buckets( $tag, $md5 ); |
94e8af14 |
781 | |
ea2f6d67 |
782 | if ( !$keyloc ) { |
94e8af14 |
783 | #XXX Need to use real key |
ea2f6d67 |
784 | # $self->add_bucket( $tag, $md5, $orig_key, undef, $orig_key ); |
94e8af14 |
785 | # return; |
786 | } |
ea2f6d67 |
787 | # elsif ( !$is_deleted ) { |
788 | else { |
789 | my $keytag = $self->load_tag( $keyloc ); |
790 | my ($subloc, $is_deleted) = $self->find_keyloc( $keytag ); |
13ff93d5 |
791 | if (!$subloc && !$is_deleted) { |
ea2f6d67 |
792 | ($subloc, $is_deleted) = $self->find_keyloc( $keytag, 0 ); |
793 | } |
794 | if ( $subloc && !$is_deleted ) { |
795 | return $self->read_from_loc( $subloc, $orig_key ); |
796 | } |
386bab6c |
797 | } |
94e8af14 |
798 | |
beac1dff |
799 | return; |
9020ee8c |
800 | } |
ab0e4957 |
801 | |
802 | sub delete_bucket { |
beac1dff |
803 | ## |
804 | # Delete single key/value pair given tag and MD5 digested key. |
805 | ## |
806 | my $self = shift; |
a97c8f67 |
807 | my ($tag, $md5, $orig_key) = @_; |
ab0e4957 |
808 | |
22e20cce |
809 | #ACID - Although this is a mutation, we must find any transaction. |
810 | # This is because we need to mark something as deleted that is in the HEAD. |
ea2f6d67 |
811 | my ($keyloc, $offset) = $self->_find_in_buckets( $tag, $md5 ); |
633df1fd |
812 | |
ea2f6d67 |
813 | return if !$keyloc; |
633df1fd |
814 | |
815 | my $fileobj = $self->_fileobj; |
816 | |
817 | my @transactions; |
818 | if ( $fileobj->transaction_id == 0 ) { |
819 | @transactions = $fileobj->current_transactions; |
820 | } |
821 | |
633df1fd |
822 | if ( $fileobj->transaction_id == 0 ) { |
ea2f6d67 |
823 | my $keytag = $self->load_tag( $keyloc ); |
7a960a12 |
824 | |
ea2f6d67 |
825 | my ($subloc, $is_deleted, $offset) = $self->find_keyloc( $keytag ); |
7a960a12 |
826 | return if !$subloc || $is_deleted; |
827 | |
633df1fd |
828 | my $value = $self->read_from_loc( $subloc, $orig_key ); |
829 | |
ea2f6d67 |
830 | my $size = $self->_length_needed( $value, $orig_key ); |
831 | |
832 | for my $trans_id ( @transactions ) { |
833 | my ($loc, $is_deleted, $offset2) = $self->find_keyloc( $keytag, $trans_id ); |
834 | unless ($loc) { |
835 | my $location2 = $fileobj->request_space( $size ); |
836 | $fileobj->print_at( $keytag->{offset} + $offset2, |
837 | pack($self->{long_pack}, $location2 ), |
838 | pack( 'C C', $trans_id, 0 ), |
839 | ); |
c3aafc14 |
840 | $self->_write_value( $location2, $orig_key, $value, $orig_key ); |
ea2f6d67 |
841 | } |
633df1fd |
842 | } |
843 | |
ea2f6d67 |
844 | $keytag = $self->load_tag( $keyloc ); |
845 | ($subloc, $is_deleted, $offset) = $self->find_keyloc( $keytag ); |
846 | $fileobj->print_at( $keytag->{offset} + $offset, |
847 | substr( $keytag->{content}, $offset + $self->{key_size} ), |
848 | chr(0) x $self->{key_size}, |
019404df |
849 | ); |
386bab6c |
850 | } |
633df1fd |
851 | else { |
ea2f6d67 |
852 | my $keytag = $self->load_tag( $keyloc ); |
7a960a12 |
853 | |
ea2f6d67 |
854 | my ($subloc, $is_deleted, $offset) = $self->find_keyloc( $keytag ); |
7a960a12 |
855 | |
ea2f6d67 |
856 | $fileobj->print_at( $keytag->{offset} + $offset, |
13ff93d5 |
857 | pack($self->{long_pack}, 0 ), |
ea2f6d67 |
858 | pack( 'C C', $fileobj->transaction_id, 1 ), |
859 | ); |
633df1fd |
860 | } |
861 | |
862 | return 1; |
ab0e4957 |
863 | } |
864 | |
912d50b1 |
865 | sub bucket_exists { |
beac1dff |
866 | ## |
867 | # Check existence of single key given tag and MD5 digested key. |
868 | ## |
869 | my $self = shift; |
e96daec8 |
870 | my ($tag, $md5) = @_; |
912d50b1 |
871 | |
21838116 |
872 | #ACID - This is a read. Can find exact or HEAD |
ea2f6d67 |
873 | my ($keyloc) = $self->_find_in_buckets( $tag, $md5 ); |
874 | my $keytag = $self->load_tag( $keyloc ); |
875 | my ($subloc, $is_deleted, $offset) = $self->find_keyloc( $keytag ); |
13ff93d5 |
876 | if ( !$subloc && !$is_deleted ) { |
ea2f6d67 |
877 | ($subloc, $is_deleted, $offset) = $self->find_keyloc( $keytag, 0 ); |
878 | } |
c9b6d0d8 |
879 | return ($subloc && !$is_deleted) && 1; |
912d50b1 |
880 | } |
881 | |
72e315ac |
882 | sub find_blist { |
beac1dff |
883 | ## |
884 | # Locate offset for bucket list, given digested key |
885 | ## |
886 | my $self = shift; |
e96daec8 |
887 | my ($offset, $md5, $args) = @_; |
d0b74c17 |
888 | $args = {} unless $args; |
889 | |
beac1dff |
890 | ## |
891 | # Locate offset for bucket list using digest index system |
892 | ## |
e96daec8 |
893 | my $tag = $self->load_tag( $offset ) |
894 | or $self->_throw_error( "INTERNAL ERROR - Cannot find tag" ); |
d0b74c17 |
895 | |
e5fc7e69 |
896 | my $ch = 0; |
8db25060 |
897 | while ($tag->{signature} ne SIG_BLIST) { |
d0b74c17 |
898 | my $num = ord substr($md5, $ch, 1); |
899 | |
900 | my $ref_loc = $tag->{offset} + ($num * $self->{long_size}); |
e96daec8 |
901 | $tag = $self->index_lookup( $tag, $num ); |
d0b74c17 |
902 | |
903 | if (!$tag) { |
29b01632 |
904 | return if !$args->{create}; |
d0b74c17 |
905 | |
019404df |
906 | my $loc = $self->_fileobj->request_space( |
e96daec8 |
907 | $self->tag_size( $self->{bucket_list_size} ), |
16d1ad9b |
908 | ); |
909 | |
019404df |
910 | $self->_fileobj->print_at( $ref_loc, pack($self->{long_pack}, $loc) ); |
d0b74c17 |
911 | |
9e4f83a0 |
912 | $tag = $self->write_tag( |
e96daec8 |
913 | $loc, SIG_BLIST, |
f37c15ab |
914 | chr(0)x$self->{bucket_list_size}, |
d5d7c51d |
915 | ); |
916 | |
917 | $tag->{ref_loc} = $ref_loc; |
918 | $tag->{ch} = $ch; |
919 | |
920 | last; |
d0b74c17 |
921 | } |
922 | |
16d1ad9b |
923 | $tag->{ch} = $ch++; |
d0b74c17 |
924 | $tag->{ref_loc} = $ref_loc; |
beac1dff |
925 | } |
d0b74c17 |
926 | |
beac1dff |
927 | return $tag; |
6736c116 |
928 | } |
929 | |
d0b74c17 |
930 | sub index_lookup { |
931 | ## |
932 | # Given index tag, lookup single entry in index and return . |
933 | ## |
934 | my $self = shift; |
e96daec8 |
935 | my ($tag, $index) = @_; |
d0b74c17 |
936 | |
937 | my $location = unpack( |
938 | $self->{long_pack}, |
939 | substr( |
940 | $tag->{content}, |
941 | $index * $self->{long_size}, |
942 | $self->{long_size}, |
943 | ), |
944 | ); |
945 | |
946 | if (!$location) { return; } |
947 | |
e96daec8 |
948 | return $self->load_tag( $location ); |
d0b74c17 |
949 | } |
950 | |
6736c116 |
951 | sub traverse_index { |
beac1dff |
952 | ## |
953 | # Scan index and recursively step into deeper levels, looking for next key. |
954 | ## |
6736c116 |
955 | my $self = shift; |
ea2f6d67 |
956 | my ($xxxx, $offset, $ch, $force_return_next) = @_; |
d0b74c17 |
957 | |
e96daec8 |
958 | my $tag = $self->load_tag( $offset ); |
6736c116 |
959 | |
8db25060 |
960 | if ($tag->{signature} ne SIG_BLIST) { |
ea2f6d67 |
961 | my $start = $xxxx->{return_next} ? 0 : ord(substr($xxxx->{prev_md5}, $ch, 1)); |
d0b74c17 |
962 | |
ea2f6d67 |
963 | for (my $idx = $start; $idx < $self->{hash_chars_used}; $idx++) { |
e5fc7e69 |
964 | my $subloc = unpack( |
965 | $self->{long_pack}, |
e06824f8 |
966 | substr( |
ea2f6d67 |
967 | $tag->{content}, |
e06824f8 |
968 | $idx * $self->{long_size}, |
969 | $self->{long_size}, |
970 | ), |
e5fc7e69 |
971 | ); |
972 | |
beac1dff |
973 | if ($subloc) { |
e5fc7e69 |
974 | my $result = $self->traverse_index( |
ea2f6d67 |
975 | $xxxx, $subloc, $ch + 1, $force_return_next, |
e5fc7e69 |
976 | ); |
977 | |
ea2f6d67 |
978 | if (defined $result) { return $result; } |
beac1dff |
979 | } |
980 | } # index loop |
d0b74c17 |
981 | |
ea2f6d67 |
982 | $xxxx->{return_next} = 1; |
42717e46 |
983 | } |
984 | # This is the bucket list |
e5fc7e69 |
985 | else { |
beac1dff |
986 | my $keys = $tag->{content}; |
ea2f6d67 |
987 | if ($force_return_next) { $xxxx->{return_next} = 1; } |
d0b74c17 |
988 | |
beac1dff |
989 | ## |
990 | # Iterate through buckets, looking for a key match |
991 | ## |
42717e46 |
992 | my $transaction_id = $self->_fileobj->transaction_id; |
8db25060 |
993 | for (my $i = 0; $i < $self->{max_buckets}; $i++) { |
ea2f6d67 |
994 | my ($key, $keyloc) = $self->_get_key_subloc( $keys, $i ); |
d0b74c17 |
995 | |
8db25060 |
996 | # End of bucket list -- return to outer loop |
ea2f6d67 |
997 | if (!$keyloc) { |
998 | $xxxx->{return_next} = 1; |
beac1dff |
999 | last; |
1000 | } |
8db25060 |
1001 | # Located previous key -- return next one found |
ea2f6d67 |
1002 | elsif ($key eq $xxxx->{prev_md5}) { |
1003 | $xxxx->{return_next} = 1; |
beac1dff |
1004 | next; |
1005 | } |
8db25060 |
1006 | # Seek to bucket location and skip over signature |
ea2f6d67 |
1007 | elsif ($xxxx->{return_next}) { |
7dcefff3 |
1008 | my $fileobj = $self->_fileobj; |
d0b74c17 |
1009 | |
ea2f6d67 |
1010 | my $keytag = $self->load_tag( $keyloc ); |
1011 | my ($subloc, $is_deleted) = $self->find_keyloc( $keytag ); |
13ff93d5 |
1012 | if ( $subloc == 0 && !$is_deleted ) { |
ea2f6d67 |
1013 | ($subloc, $is_deleted) = $self->find_keyloc( $keytag, 0 ); |
1014 | } |
1015 | next if $is_deleted; |
1016 | |
beac1dff |
1017 | # Skip over value to get to plain key |
7dcefff3 |
1018 | my $sig = $fileobj->read_at( $subloc, SIG_SIZE ); |
8db25060 |
1019 | |
7dcefff3 |
1020 | my $size = $fileobj->read_at( undef, $self->{data_size} ); |
e5fc7e69 |
1021 | $size = unpack($self->{data_pack}, $size); |
7dcefff3 |
1022 | if ($size) { $fileobj->increment_pointer( $size ); } |
d0b74c17 |
1023 | |
beac1dff |
1024 | # Read in plain key and return as scalar |
7dcefff3 |
1025 | $size = $fileobj->read_at( undef, $self->{data_size} ); |
e5fc7e69 |
1026 | $size = unpack($self->{data_pack}, $size); |
86867f3a |
1027 | |
7dcefff3 |
1028 | my $plain_key; |
1029 | if ($size) { $plain_key = $fileobj->read_at( undef, $size); } |
beac1dff |
1030 | return $plain_key; |
1031 | } |
8db25060 |
1032 | } |
d0b74c17 |
1033 | |
ea2f6d67 |
1034 | $xxxx->{return_next} = 1; |
42717e46 |
1035 | } |
d0b74c17 |
1036 | |
beac1dff |
1037 | return; |
6736c116 |
1038 | } |
1039 | |
75be6413 |
1040 | # Utilities |
1041 | |
9cec1360 |
1042 | sub _get_key_subloc { |
75be6413 |
1043 | my $self = shift; |
1044 | my ($keys, $idx) = @_; |
1045 | |
ea2f6d67 |
1046 | return unpack( |
28394a1a |
1047 | # This is 'a', not 'A'. Please read the pack() documentation for the |
1048 | # difference between the two and why it's important. |
ea2f6d67 |
1049 | "a$self->{hash_size} $self->{long_pack}", |
75be6413 |
1050 | substr( |
1051 | $keys, |
9cec1360 |
1052 | ($idx * $self->{bucket_size}), |
1053 | $self->{bucket_size}, |
75be6413 |
1054 | ), |
1055 | ); |
75be6413 |
1056 | } |
1057 | |
d608b06e |
1058 | sub _find_in_buckets { |
1059 | my $self = shift; |
ea2f6d67 |
1060 | my ($tag, $md5) = @_; |
21838116 |
1061 | |
d608b06e |
1062 | BUCKET: |
1063 | for ( my $i = 0; $i < $self->{max_buckets}; $i++ ) { |
ea2f6d67 |
1064 | my ($key, $subloc) = $self->_get_key_subloc( |
9a187d8c |
1065 | $tag->{content}, $i, |
1066 | ); |
d608b06e |
1067 | |
ea2f6d67 |
1068 | my @rv = ($subloc, $i * $self->{bucket_size}); |
21838116 |
1069 | |
1070 | unless ( $subloc ) { |
21838116 |
1071 | return @rv; |
1072 | } |
1073 | |
1074 | next BUCKET if $key ne $md5; |
d608b06e |
1075 | |
21838116 |
1076 | return @rv; |
d608b06e |
1077 | } |
1078 | |
1079 | return; |
1080 | } |
1081 | |
994ccd8e |
1082 | sub _release_space { |
1083 | my $self = shift; |
e96daec8 |
1084 | my ($size, $loc) = @_; |
994ccd8e |
1085 | |
7b1e1aa1 |
1086 | my $next_loc = 0; |
1087 | |
019404df |
1088 | $self->_fileobj->print_at( $loc, |
1089 | SIG_FREE, |
1090 | pack($self->{long_pack}, $size ), |
1091 | pack($self->{long_pack}, $next_loc ), |
7b1e1aa1 |
1092 | ); |
1093 | |
994ccd8e |
1094 | return; |
1095 | } |
1096 | |
e96daec8 |
1097 | sub _throw_error { |
1098 | die "DBM::Deep: $_[1]\n"; |
1099 | } |
1100 | |
86867f3a |
1101 | sub _get_dbm_object { |
1102 | my $item = shift; |
1103 | |
1104 | my $obj = eval { |
1105 | local $SIG{__DIE__}; |
1106 | if ($item->isa( 'DBM::Deep' )) { |
1107 | return $item; |
1108 | } |
1109 | return; |
1110 | }; |
1111 | return $obj if $obj; |
1112 | |
1113 | my $r = Scalar::Util::reftype( $item ) || ''; |
1114 | if ( $r eq 'HASH' ) { |
1115 | my $obj = eval { |
1116 | local $SIG{__DIE__}; |
1117 | my $obj = tied(%$item); |
1118 | if ($obj->isa( 'DBM::Deep' )) { |
1119 | return $obj; |
1120 | } |
1121 | return; |
1122 | }; |
1123 | return $obj if $obj; |
1124 | } |
1125 | elsif ( $r eq 'ARRAY' ) { |
1126 | my $obj = eval { |
1127 | local $SIG{__DIE__}; |
1128 | my $obj = tied(@$item); |
1129 | if ($obj->isa( 'DBM::Deep' )) { |
1130 | return $obj; |
1131 | } |
1132 | return; |
1133 | }; |
1134 | return $obj if $obj; |
1135 | } |
1136 | |
1137 | return; |
1138 | } |
1139 | |
1140 | sub _length_needed { |
1141 | my $self = shift; |
1142 | my ($value, $key) = @_; |
1143 | |
1144 | my $is_dbm_deep = eval { |
1145 | local $SIG{'__DIE__'}; |
1146 | $value->isa( 'DBM::Deep' ); |
1147 | }; |
1148 | |
1149 | my $len = SIG_SIZE |
1150 | + $self->{data_size} # size for value |
1151 | + $self->{data_size} # size for key |
1152 | + length( $key ); # length of key |
1153 | |
1154 | if ( $is_dbm_deep && $value->_fileobj eq $self->_fileobj ) { |
1155 | # long_size is for the internal reference |
1156 | return $len + $self->{long_size}; |
1157 | } |
1158 | |
1159 | if ( $self->_fileobj->{autobless} ) { |
1160 | # This is for the bit saying whether or not this thing is blessed. |
1161 | $len += 1; |
1162 | } |
1163 | |
1164 | my $r = Scalar::Util::reftype( $value ) || ''; |
1165 | unless ( $r eq 'HASH' || $r eq 'ARRAY' ) { |
1166 | if ( defined $value ) { |
1167 | $len += length( $value ); |
1168 | } |
1169 | return $len; |
1170 | } |
1171 | |
1172 | $len += $self->{index_size}; |
1173 | |
1174 | # if autobless is enabled, must also take into consideration |
1175 | # the class name as it is stored after the key. |
1176 | if ( $self->_fileobj->{autobless} ) { |
1177 | my $c = Scalar::Util::blessed($value); |
1178 | if ( defined $c && !$is_dbm_deep ) { |
1179 | $len += $self->{data_size} + length($c); |
1180 | } |
1181 | } |
1182 | |
1183 | return $len; |
1184 | } |
1185 | |
a20d9a3f |
1186 | 1; |
1187 | __END__ |