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' } |
14 | |
15 | __END__ |
16 | |
2c70efe1 |
17 | sub read_value { |
18 | my $self = shift; |
19 | my ($obj, $key) = @_; |
20 | } |
21 | |
22 | sub get_classname { |
23 | my $self = shift; |
24 | my ($obj) = @_; |
25 | } |
26 | |
27 | sub make_reference { |
28 | my $self = shift; |
29 | my ($obj, $old_key, $new_key) = @_; |
30 | } |
31 | |
32 | sub key_exists { |
33 | my $self = shift; |
34 | my ($obj, $key) = @_; |
35 | } |
36 | |
37 | sub delete_key { |
38 | my $self = shift; |
39 | my ($obj, $key) = @_; |
40 | } |
41 | |
42 | sub write_value { |
43 | my $self = shift; |
44 | my ($obj, $key, $value) = @_; |
45 | |
46 | my $r = Scalar::Util::reftype( $value ) || ''; |
47 | { |
48 | last if $r eq ''; |
49 | last if $r eq 'HASH'; |
50 | last if $r eq 'ARRAY'; |
51 | |
52 | DBM::Deep->_throw_error( |
53 | "Storage of references of type '$r' is not supported." |
54 | ); |
55 | } |
56 | |
57 | # Load the reference entry |
58 | # Determine if the row was deleted under us |
59 | # |
60 | |
61 | my ($type); |
62 | if ( $r eq 'ARRAY' || $r eq 'HASH' ) { |
63 | my $tmpvar; |
64 | if ( $r eq 'ARRAY' ) { |
65 | $tmpvar = tied @$value; |
66 | } elsif ( $r eq 'HASH' ) { |
67 | $tmpvar = tied %$value; |
68 | } |
69 | |
70 | if ( $tmpvar ) { |
71 | my $is_dbm_deep = eval { local $SIG{'__DIE__'}; $tmpvar->isa( 'DBM::Deep' ); }; |
72 | |
73 | unless ( $is_dbm_deep ) { |
74 | DBM::Deep->_throw_error( "Cannot store something that is tied." ); |
75 | } |
76 | |
77 | unless ( $tmpvar->_engine->storage == $self->storage ) { |
78 | DBM::Deep->_throw_error( "Cannot store values across DBM::Deep files. Please use export() instead." ); |
79 | } |
80 | |
81 | # Load $tmpvar's sector |
82 | |
83 | # First, verify if we're storing the same thing to this spot. If we |
84 | # are, then this should be a no-op. -EJS, 2008-05-19 |
85 | |
86 | # See whether or not we are storing ourselves to ourself. |
87 | # Write the sector as data in this reference (keyed by $key) |
88 | $value_sector->increment_refcount; |
89 | |
90 | return 1; |
91 | } |
92 | |
93 | $type = substr( $r, 0, 1 ); |
94 | } |
95 | else { |
96 | if ( tied($value) ) { |
97 | DBM::Deep->_throw_error( "Cannot store something that is tied." ); |
98 | } |
99 | } |
100 | |
101 | # This code is to make sure we write all the values in the $value to the |
102 | # disk and to make sure all changes to $value after the assignment are |
103 | # reflected on disk. This may be counter-intuitive at first, but it is |
104 | # correct dwimmery. |
105 | # NOTE - simply tying $value won't perform a STORE on each value. Hence, |
106 | # the copy to a temp value. |
107 | if ( $r eq 'ARRAY' ) { |
108 | my @temp = @$value; |
109 | tie @$value, 'DBM::Deep', { |
110 | base_offset => $value_sector->offset, |
111 | staleness => $value_sector->staleness, |
112 | storage => $self->storage, |
113 | engine => $self, |
114 | }; |
115 | @$value = @temp; |
116 | bless $value, 'DBM::Deep::Array' unless Scalar::Util::blessed( $value ); |
117 | } |
118 | elsif ( $r eq 'HASH' ) { |
119 | my %temp = %$value; |
120 | tie %$value, 'DBM::Deep', { |
121 | base_offset => $value_sector->offset, |
122 | staleness => $value_sector->staleness, |
123 | storage => $self->storage, |
124 | engine => $self, |
125 | }; |
126 | |
127 | %$value = %temp; |
128 | bless $value, 'DBM::Deep::Hash' unless Scalar::Util::blessed( $value ); |
129 | } |
130 | |
131 | return 1; |
132 | } |
133 | |
134 | sub setup { |
135 | my $self = shift; |
136 | my ($obj) = @_; |
137 | } |
138 | |
139 | sub begin_work { |
140 | my $self = shift; |
141 | my ($obj) = @_; |
142 | } |
143 | |
144 | sub rollback { |
145 | my $self = shift; |
146 | my ($obj) = @_; |
147 | } |
148 | |
149 | sub commit { |
150 | my $self = shift; |
151 | my ($obj) = @_; |
152 | } |
153 | |
154 | |
155 | 1; |
156 | __END__ |