Commit | Line | Data |
2c70efe1 |
1 | package DBM::Deep::Engine::DBI; |
2 | |
3 | use 5.006_000; |
4 | |
5 | use strict; |
6 | use warnings FATAL => 'all'; |
7 | |
8 | use base 'DBM::Deep::Engine'; |
9 | |
d6ecf579 |
10 | use DBM::Deep::Sector::DBI (); |
11 | use DBM::Deep::Storage::DBI (); |
12 | |
13 | sub sector_type { 'DBM::Deep::Sector::DBI' } |
19b913ce |
14 | sub iterator_class { 'DBM::Deep::Iterator::DBI' } |
d6ecf579 |
15 | |
a4d36ff6 |
16 | sub new { |
17 | my $class = shift; |
18 | my ($args) = @_; |
19 | |
20 | $args->{storage} = DBM::Deep::Storage::DBI->new( $args ) |
21 | unless exists $args->{storage}; |
22 | |
23 | my $self = bless { |
24 | storage => undef, |
25 | }, $class; |
26 | |
27 | # Grab the parameters we want to use |
28 | foreach my $param ( keys %$self ) { |
29 | next unless exists $args->{$param}; |
30 | $self->{$param} = $args->{$param}; |
31 | } |
32 | |
33 | return $self; |
34 | } |
35 | |
36 | sub setup { |
37 | my $self = shift; |
38 | my ($obj) = @_; |
39 | |
40 | # Default the id to 1. This means that we will be creating a row if there |
41 | # isn't one. The assumption is that the row_id=1 cannot never be deleted. I |
42 | # don't know if this is a good assumption. |
43 | $obj->{base_offset} ||= 1; |
44 | |
45 | my ($rows) = $self->storage->read_from( |
46 | refs => $obj->_base_offset, |
47 | qw( ref_type ), |
48 | ); |
49 | |
50 | # We don't have a row yet. |
51 | unless ( @$rows ) { |
52 | $self->storage->write_to( |
53 | refs => $obj->_base_offset, |
54 | ref_type => $obj->_type, |
55 | ); |
56 | } |
57 | |
58 | my $sector = DBM::Deep::Sector::DBI::Reference->new({ |
59 | engine => $self, |
60 | offset => $obj->_base_offset, |
61 | }); |
62 | } |
d6ecf579 |
63 | |
2c70efe1 |
64 | sub read_value { |
65 | my $self = shift; |
66 | my ($obj, $key) = @_; |
a4d36ff6 |
67 | |
68 | my $sector = $self->load_sector( $obj->_base_offset, 'refs' ) |
69 | or return; |
70 | |
71 | # if ( $sector->staleness != $obj->_staleness ) { |
72 | # return; |
73 | # } |
74 | |
75 | # my $key_md5 = $self->_apply_digest( $key ); |
76 | |
77 | my $value_sector = $sector->get_data_for({ |
78 | key => $key, |
79 | # key_md5 => $key_md5, |
80 | allow_head => 1, |
81 | }); |
82 | |
83 | unless ( $value_sector ) { |
84 | $value_sector = DBM::Deep::Sector::DBI::Scalar->new({ |
cf4a1344 |
85 | engine => $self, |
86 | data => undef, |
87 | data_type => 'S', |
a4d36ff6 |
88 | }); |
89 | |
90 | $sector->write_data({ |
91 | # key_md5 => $key_md5, |
92 | key => $key, |
93 | value => $value_sector, |
94 | }); |
95 | } |
96 | |
97 | return $value_sector->data; |
2c70efe1 |
98 | } |
99 | |
100 | sub get_classname { |
101 | my $self = shift; |
102 | my ($obj) = @_; |
350896ee |
103 | |
1f1f7e24 |
104 | my $sector = $self->load_sector( $obj->_base_offset, 'refs' ) |
105 | or return; |
106 | |
107 | return $sector->get_classname; |
2c70efe1 |
108 | } |
109 | |
110 | sub make_reference { |
111 | my $self = shift; |
112 | my ($obj, $old_key, $new_key) = @_; |
641aa32d |
113 | |
114 | my $sector = $self->load_sector( $obj->_base_offset, 'refs' ) |
115 | or return; |
116 | |
117 | # if ( $sector->staleness != $obj->_staleness ) { |
118 | # return; |
119 | # } |
120 | |
121 | my $value_sector = $sector->get_data_for({ |
122 | key => $old_key, |
123 | allow_head => 1, |
124 | }); |
125 | |
126 | unless ( $value_sector ) { |
127 | $value_sector = DBM::Deep::Sector::DBI::Scalar->new({ |
128 | engine => $self, |
129 | data => undef, |
130 | }); |
131 | |
132 | $sector->write_data({ |
133 | key => $old_key, |
134 | value => $value_sector, |
135 | }); |
136 | } |
137 | |
138 | if ( $value_sector->isa( 'DBM::Deep::Sector::DBI::Reference' ) ) { |
139 | $sector->write_data({ |
140 | key => $new_key, |
141 | value => $value_sector, |
142 | }); |
143 | $value_sector->increment_refcount; |
144 | } |
145 | else { |
146 | $sector->write_data({ |
147 | key => $new_key, |
148 | value => $value_sector->clone, |
149 | }); |
150 | } |
151 | |
152 | return; |
2c70efe1 |
153 | } |
154 | |
a4d36ff6 |
155 | # exists returns '', not undefined. |
2c70efe1 |
156 | sub key_exists { |
157 | my $self = shift; |
158 | my ($obj, $key) = @_; |
a4d36ff6 |
159 | |
160 | my $sector = $self->load_sector( $obj->_base_offset, 'refs' ) |
161 | or return ''; |
162 | |
163 | # if ( $sector->staleness != $obj->_staleness ) { |
164 | # return ''; |
165 | # } |
166 | |
167 | my $data = $sector->get_data_for({ |
168 | # key_md5 => $self->_apply_digest( $key ), |
169 | key => $key, |
170 | allow_head => 1, |
171 | }); |
172 | |
173 | # exists() returns 1 or '' for true/false. |
174 | return $data ? 1 : ''; |
2c70efe1 |
175 | } |
176 | |
177 | sub delete_key { |
178 | my $self = shift; |
179 | my ($obj, $key) = @_; |
a4d36ff6 |
180 | |
181 | my $sector = $self->load_sector( $obj->_base_offset, 'refs' ) |
182 | or return ''; |
183 | |
184 | # if ( $sector->staleness != $obj->_staleness ) { |
185 | # return ''; |
186 | # } |
187 | |
188 | return $sector->delete_key({ |
189 | # key_md5 => $self->_apply_digest( $key ), |
190 | key => $key, |
191 | allow_head => 0, |
192 | }); |
2c70efe1 |
193 | } |
194 | |
195 | sub write_value { |
196 | my $self = shift; |
197 | my ($obj, $key, $value) = @_; |
198 | |
199 | my $r = Scalar::Util::reftype( $value ) || ''; |
200 | { |
201 | last if $r eq ''; |
202 | last if $r eq 'HASH'; |
203 | last if $r eq 'ARRAY'; |
204 | |
205 | DBM::Deep->_throw_error( |
206 | "Storage of references of type '$r' is not supported." |
207 | ); |
208 | } |
209 | |
210 | # Load the reference entry |
211 | # Determine if the row was deleted under us |
212 | # |
213 | |
a4d36ff6 |
214 | my $sector = $self->load_sector( $obj->_base_offset, 'refs' ) |
215 | or die "Cannot load sector at '@{[$obj->_base_offset]}'\n";; |
216 | |
217 | my ($type, $class); |
2c70efe1 |
218 | if ( $r eq 'ARRAY' || $r eq 'HASH' ) { |
219 | my $tmpvar; |
220 | if ( $r eq 'ARRAY' ) { |
221 | $tmpvar = tied @$value; |
222 | } elsif ( $r eq 'HASH' ) { |
223 | $tmpvar = tied %$value; |
224 | } |
225 | |
226 | if ( $tmpvar ) { |
227 | my $is_dbm_deep = eval { local $SIG{'__DIE__'}; $tmpvar->isa( 'DBM::Deep' ); }; |
228 | |
229 | unless ( $is_dbm_deep ) { |
230 | DBM::Deep->_throw_error( "Cannot store something that is tied." ); |
231 | } |
232 | |
233 | unless ( $tmpvar->_engine->storage == $self->storage ) { |
234 | DBM::Deep->_throw_error( "Cannot store values across DBM::Deep files. Please use export() instead." ); |
235 | } |
236 | |
237 | # Load $tmpvar's sector |
238 | |
239 | # First, verify if we're storing the same thing to this spot. If we |
240 | # are, then this should be a no-op. -EJS, 2008-05-19 |
241 | |
242 | # See whether or not we are storing ourselves to ourself. |
243 | # Write the sector as data in this reference (keyed by $key) |
2467cee7 |
244 | my $value_sector = $self->load_sector( $tmpvar->_base_offset, 'refs' ); |
a4d36ff6 |
245 | $sector->write_data({ |
246 | key => $key, |
2467cee7 |
247 | # key_md5 => $self->_apply_digest( $key ), |
a4d36ff6 |
248 | value => $value_sector, |
249 | }); |
2c70efe1 |
250 | $value_sector->increment_refcount; |
251 | |
252 | return 1; |
253 | } |
254 | |
255 | $type = substr( $r, 0, 1 ); |
a4d36ff6 |
256 | $class = 'DBM::Deep::Sector::DBI::Reference'; |
2c70efe1 |
257 | } |
258 | else { |
259 | if ( tied($value) ) { |
260 | DBM::Deep->_throw_error( "Cannot store something that is tied." ); |
261 | } |
a4d36ff6 |
262 | |
263 | $class = 'DBM::Deep::Sector::DBI::Scalar'; |
264 | $type = 'S'; |
2c70efe1 |
265 | } |
266 | |
a4d36ff6 |
267 | # Create this after loading the reference sector in case something bad |
268 | # happens. This way, we won't allocate value sector(s) needlessly. |
269 | my $value_sector = $class->new({ |
270 | engine => $self, |
271 | data => $value, |
272 | type => $type, |
273 | }); |
274 | |
275 | $sector->write_data({ |
276 | key => $key, |
277 | # key_md5 => $self->_apply_digest( $key ), |
278 | value => $value_sector, |
279 | }); |
280 | |
2c70efe1 |
281 | # This code is to make sure we write all the values in the $value to the |
282 | # disk and to make sure all changes to $value after the assignment are |
283 | # reflected on disk. This may be counter-intuitive at first, but it is |
284 | # correct dwimmery. |
285 | # NOTE - simply tying $value won't perform a STORE on each value. Hence, |
286 | # the copy to a temp value. |
287 | if ( $r eq 'ARRAY' ) { |
288 | my @temp = @$value; |
289 | tie @$value, 'DBM::Deep', { |
290 | base_offset => $value_sector->offset, |
a4d36ff6 |
291 | # staleness => $value_sector->staleness, |
2c70efe1 |
292 | storage => $self->storage, |
293 | engine => $self, |
294 | }; |
295 | @$value = @temp; |
296 | bless $value, 'DBM::Deep::Array' unless Scalar::Util::blessed( $value ); |
297 | } |
298 | elsif ( $r eq 'HASH' ) { |
299 | my %temp = %$value; |
300 | tie %$value, 'DBM::Deep', { |
301 | base_offset => $value_sector->offset, |
a4d36ff6 |
302 | # staleness => $value_sector->staleness, |
2c70efe1 |
303 | storage => $self->storage, |
304 | engine => $self, |
305 | }; |
306 | |
307 | %$value = %temp; |
308 | bless $value, 'DBM::Deep::Hash' unless Scalar::Util::blessed( $value ); |
309 | } |
310 | |
311 | return 1; |
312 | } |
313 | |
1dc56442 |
314 | sub begin_work { die "Transactions are not supported by this engine" } |
315 | sub rollback { die "Transactions are not supported by this engine" } |
316 | sub commit { die "Transactions are not supported by this engine" } |
2c70efe1 |
317 | |
580e5ee2 |
318 | sub supports { |
319 | shift; |
320 | my ($feature) = @_; |
2c70efe1 |
321 | |
580e5ee2 |
322 | return if $feature eq 'transactions'; |
323 | return; |
2c70efe1 |
324 | } |
325 | |
2c70efe1 |
326 | 1; |
327 | __END__ |