1 package DBM::Deep::Engine::DBI;
6 use warnings FATAL => 'all';
8 use base 'DBM::Deep::Engine';
10 use DBM::Deep::Sector::DBI ();
11 use DBM::Deep::Storage::DBI ();
13 sub sector_type { 'DBM::Deep::Sector::DBI' }
19 $args->{storage} = DBM::Deep::Storage::DBI->new( $args )
20 unless exists $args->{storage};
26 # Grab the parameters we want to use
27 foreach my $param ( keys %$self ) {
28 next unless exists $args->{$param};
29 $self->{$param} = $args->{$param};
39 # Default the id to 1. This means that we will be creating a row if there
40 # isn't one. The assumption is that the row_id=1 cannot never be deleted. I
41 # don't know if this is a good assumption.
42 $obj->{base_offset} ||= 1;
44 my ($rows) = $self->storage->read_from(
45 refs => $obj->_base_offset,
49 # We don't have a row yet.
51 $self->storage->write_to(
52 refs => $obj->_base_offset,
53 ref_type => $obj->_type,
57 my $sector = DBM::Deep::Sector::DBI::Reference->new({
59 offset => $obj->_base_offset,
67 my $sector = $self->load_sector( $obj->_base_offset, 'refs' )
70 # if ( $sector->staleness != $obj->_staleness ) {
74 # my $key_md5 = $self->_apply_digest( $key );
76 my $value_sector = $sector->get_data_for({
78 # key_md5 => $key_md5,
82 unless ( $value_sector ) {
83 $value_sector = DBM::Deep::Sector::DBI::Scalar->new({
89 # key_md5 => $key_md5,
91 value => $value_sector,
95 return $value_sector->data;
106 my ($obj, $old_key, $new_key) = @_;
110 # exists returns '', not undefined.
113 my ($obj, $key) = @_;
115 my $sector = $self->load_sector( $obj->_base_offset, 'refs' )
118 # if ( $sector->staleness != $obj->_staleness ) {
122 my $data = $sector->get_data_for({
123 # key_md5 => $self->_apply_digest( $key ),
128 # exists() returns 1 or '' for true/false.
129 return $data ? 1 : '';
134 my ($obj, $key) = @_;
136 my $sector = $self->load_sector( $obj->_base_offset, 'refs' )
139 # if ( $sector->staleness != $obj->_staleness ) {
143 return $sector->delete_key({
144 # key_md5 => $self->_apply_digest( $key ),
152 my ($obj, $key, $value) = @_;
154 my $r = Scalar::Util::reftype( $value ) || '';
157 last if $r eq 'HASH';
158 last if $r eq 'ARRAY';
160 DBM::Deep->_throw_error(
161 "Storage of references of type '$r' is not supported."
165 # Load the reference entry
166 # Determine if the row was deleted under us
169 my $sector = $self->load_sector( $obj->_base_offset, 'refs' )
170 or die "Cannot load sector at '@{[$obj->_base_offset]}'\n";;
173 if ( $r eq 'ARRAY' || $r eq 'HASH' ) {
175 if ( $r eq 'ARRAY' ) {
176 $tmpvar = tied @$value;
177 } elsif ( $r eq 'HASH' ) {
178 $tmpvar = tied %$value;
182 my $is_dbm_deep = eval { local $SIG{'__DIE__'}; $tmpvar->isa( 'DBM::Deep' ); };
184 unless ( $is_dbm_deep ) {
185 DBM::Deep->_throw_error( "Cannot store something that is tied." );
188 unless ( $tmpvar->_engine->storage == $self->storage ) {
189 DBM::Deep->_throw_error( "Cannot store values across DBM::Deep files. Please use export() instead." );
192 # Load $tmpvar's sector
194 # First, verify if we're storing the same thing to this spot. If we
195 # are, then this should be a no-op. -EJS, 2008-05-19
197 # See whether or not we are storing ourselves to ourself.
198 # Write the sector as data in this reference (keyed by $key)
199 my $value_sector = $self->load_sector( $tmpvar->_base_offset );
200 $sector->write_data({
202 key_md5 => $self->_apply_digest( $key ),
203 value => $value_sector,
205 $value_sector->increment_refcount;
210 $type = substr( $r, 0, 1 );
211 $class = 'DBM::Deep::Sector::DBI::Reference';
214 if ( tied($value) ) {
215 DBM::Deep->_throw_error( "Cannot store something that is tied." );
218 $class = 'DBM::Deep::Sector::DBI::Scalar';
222 # Create this after loading the reference sector in case something bad
223 # happens. This way, we won't allocate value sector(s) needlessly.
224 my $value_sector = $class->new({
230 $sector->write_data({
232 # key_md5 => $self->_apply_digest( $key ),
233 value => $value_sector,
236 # This code is to make sure we write all the values in the $value to the
237 # disk and to make sure all changes to $value after the assignment are
238 # reflected on disk. This may be counter-intuitive at first, but it is
240 # NOTE - simply tying $value won't perform a STORE on each value. Hence,
241 # the copy to a temp value.
242 if ( $r eq 'ARRAY' ) {
244 tie @$value, 'DBM::Deep', {
245 base_offset => $value_sector->offset,
246 # staleness => $value_sector->staleness,
247 storage => $self->storage,
251 bless $value, 'DBM::Deep::Array' unless Scalar::Util::blessed( $value );
253 elsif ( $r eq 'HASH' ) {
255 tie %$value, 'DBM::Deep', {
256 base_offset => $value_sector->offset,
257 # staleness => $value_sector->staleness,
258 storage => $self->storage,
263 bless $value, 'DBM::Deep::Hash' unless Scalar::Util::blessed( $value );