| 1 |
# -*- Mode: Cperl -*- |
| 2 |
# Index.pm -- |
| 3 |
# ITIID : $ITI$ $Header $__Header$ |
| 4 |
# Author : Ulrich Pfeifer |
| 5 |
# Created On : Thu Aug 8 13:05:10 1996 |
| 6 |
# Last Modified By: Ulrich Pfeifer |
| 7 |
# Last Modified On: Sun Nov 22 18:44:43 1998 |
| 8 |
# Language : CPerl |
| 9 |
# Update Count : 107 |
| 10 |
# Status : Unknown, Use with caution! |
| 11 |
# |
| 12 |
# Copyright (c) 1996-1997, Ulrich Pfeifer |
| 13 |
# |
| 14 |
|
| 15 |
package WAIT::Index; |
| 16 |
use WAIT::IndexScan; |
| 17 |
use strict; |
| 18 |
use BerkeleyDB; |
| 19 |
use Fcntl; |
| 20 |
use vars qw($VERSION); |
| 21 |
|
| 22 |
$VERSION = "2.000"; # Table.pm tests if we are loaded by checking $VERSION |
| 23 |
|
| 24 |
sub new { |
| 25 |
my $type = shift; |
| 26 |
my %parm = @_; |
| 27 |
my $self = {}; |
| 28 |
|
| 29 |
for my $x (qw(file attr env subname maindbfile tablename)) { |
| 30 |
unless ($self->{$x} = $parm{$x}) { |
| 31 |
require Carp; |
| 32 |
Carp::croak("No $x specified"); |
| 33 |
} |
| 34 |
} |
| 35 |
bless $self, ref($type) || $type; |
| 36 |
} |
| 37 |
|
| 38 |
for my $accessor (qw(maindbfile tablename subname)) { |
| 39 |
no strict 'refs'; |
| 40 |
*{$accessor} = sub { |
| 41 |
my($self) = @_; |
| 42 |
return $self->{$accessor} if $self->{$accessor}; |
| 43 |
require Carp; |
| 44 |
Carp::confess("accessor $accessor not there"); |
| 45 |
} |
| 46 |
} |
| 47 |
|
| 48 |
sub drop { |
| 49 |
my $self = shift; |
| 50 |
if ((caller)[0] eq 'WAIT::Table') { # Table knows about this |
| 51 |
my $file = $self->{file}; |
| 52 |
! (!-e $file or unlink $file); |
| 53 |
} else { # notify our database |
| 54 |
require Carp; |
| 55 |
Carp::croak(ref($self)."::drop called directly"); |
| 56 |
} |
| 57 |
} |
| 58 |
|
| 59 |
sub open { |
| 60 |
my $self = shift; |
| 61 |
my $file = $self->{file}; |
| 62 |
|
| 63 |
if (exists $self->{dbh}) { |
| 64 |
$self->{dbh}; |
| 65 |
} else { |
| 66 |
my $flags; |
| 67 |
if ($self->{mode} & O_RDWR) { |
| 68 |
$flags = DB_CREATE; # | DB_INIT_MPOOL | DB_INIT_CDB; |
| 69 |
# warn "Flags on index $file set to 'writing'"; |
| 70 |
} else { |
| 71 |
$flags = DB_RDONLY; |
| 72 |
# warn "Flags on index $file set to 'readonly'"; |
| 73 |
} |
| 74 |
$self->{dbh} = tie(%{$self->{db}}, 'BerkeleyDB::Btree', |
| 75 |
# Filename => $file, |
| 76 |
Filename => $self->maindbfile, |
| 77 |
$self->{env} ? (Env => $self->{env}) : (), |
| 78 |
Subname => join("/",$self->tablename,$self->subname), |
| 79 |
Mode => 0664, |
| 80 |
Flags => $flags, |
| 81 |
$WAIT::Database::Cachesize?(Cachesize => $WAIT::Database::Cachesize):(), |
| 82 |
$WAIT::Database::Pagesize?(Pagesize => $WAIT::Database::Pagesize):(), |
| 83 |
) or die $BerkeleyDB::Error; |
| 84 |
} |
| 85 |
} |
| 86 |
|
| 87 |
sub insert { |
| 88 |
my $self = shift; |
| 89 |
my $key = shift; |
| 90 |
my %parm = @_; |
| 91 |
|
| 92 |
defined $self->{db} or $self->open; |
| 93 |
|
| 94 |
my $tuple = join($;, map($parm{$_}, @{$self->{attr}})); |
| 95 |
|
| 96 |
if (exists $self->{db}->{$tuple}) { |
| 97 |
# duplicate entry |
| 98 |
return undef; |
| 99 |
} |
| 100 |
$self->{db}->{$tuple} = $key; |
| 101 |
} |
| 102 |
|
| 103 |
sub have { |
| 104 |
my $self = shift; |
| 105 |
my %parm = @_; |
| 106 |
|
| 107 |
defined $self->{db} or $self->open; |
| 108 |
|
| 109 |
my $tuple = join($;, map($parm{$_}, @{$self->{attr}})); |
| 110 |
|
| 111 |
$self->{db}->{$tuple}; |
| 112 |
} |
| 113 |
|
| 114 |
sub fetch { |
| 115 |
my $self = shift; |
| 116 |
my %parm = @_; |
| 117 |
my @keys = @{$self->{attr}->[0]}; |
| 118 |
|
| 119 |
defined $self->{db} or $self->open; |
| 120 |
|
| 121 |
my $key = join($;, map($parm{$_}, @keys)); |
| 122 |
$self->{db}->{$key}; |
| 123 |
} |
| 124 |
|
| 125 |
sub delete { |
| 126 |
my $self = shift; |
| 127 |
my $key = shift; |
| 128 |
my %parm = @_; |
| 129 |
|
| 130 |
defined $self->{db} or $self->open; |
| 131 |
|
| 132 |
my $tuple = join($;, map($parm{$_}||"", @{$self->{attr}})); |
| 133 |
|
| 134 |
delete $self->{db}->{$tuple}; |
| 135 |
} |
| 136 |
|
| 137 |
sub sync { |
| 138 |
my $self = shift; |
| 139 |
$self->{dbh}->sync if $self->{dbh}; |
| 140 |
} |
| 141 |
|
| 142 |
sub close { |
| 143 |
my $self = shift; |
| 144 |
|
| 145 |
delete $self->{scans} if defined $self->{scans}; |
| 146 |
|
| 147 |
delete $self->{env}; |
| 148 |
if ($self->{dbh}) { |
| 149 |
delete $self->{dbh}; |
| 150 |
untie %{$self->{db}}; |
| 151 |
for my $att (qw(db file maindbfile)) { |
| 152 |
delete $self->{$att}; |
| 153 |
} |
| 154 |
} |
| 155 |
} |
| 156 |
|
| 157 |
#sub DESTROY { $_[0]->close } |
| 158 |
|
| 159 |
sub open_scan { |
| 160 |
my $self = shift; |
| 161 |
my $code = shift; |
| 162 |
|
| 163 |
$self->{dbh} or $self->open; |
| 164 |
new WAIT::IndexScan $self, $code; |
| 165 |
} |
| 166 |
|
| 167 |
1; |
Parent Directory
| 
Revision Log