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