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package KiokuDB::Entry; |
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BEGIN { |
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$KiokuDB::Entry::AUTHORITY = 'cpan:NUFFIN'; |
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} |
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$KiokuDB::Entry::VERSION = '0.57'; |
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use Moose; |
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# ABSTRACT: An entry in the database |
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use Moose::Util::TypeConstraints; |
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use namespace::clean -except => 'meta'; |
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with 'MooseX::Clone' => { -version => 0.04 }; |
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has id => ( |
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isa => "Str", |
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is => "ro", |
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writer => "_id", |
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clearer => "clear_id", |
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predicate => "has_id", |
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); |
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has root => ( |
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isa => "Bool", |
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is => "rw", |
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lazy_build => 1, |
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); |
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sub _build_root { |
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my $self = shift; |
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if ( $self->has_id and my $prev = $self->prev ) { |
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return $prev->root; |
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} else { |
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return 0; |
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} |
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} |
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has deleted => ( |
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isa => "Bool", |
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is => "ro", |
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writer => "_deleted", |
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); |
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has data => ( |
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is => "ro", |
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writer => "_data", |
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predicate => "has_data", |
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); |
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has class => ( |
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isa => "Str", |
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is => "ro", |
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writer => "_class", |
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predicate => "has_class", |
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); |
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has class_meta => ( |
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isa => "HashRef", |
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is => "ro", |
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writer => "_class_meta", |
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predicate => "has_class_meta", |
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); |
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has class_version => ( |
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isa => "Str", |
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is => "ro", |
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writer => "_class_version", |
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predicate => "has_class_version", |
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); |
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72
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my @tied = ( map { substr($_, 0, 1) } qw(HASH SCALAR ARRAY GLOB) ); |
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has tied => ( |
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is => "ro", |
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writer => "_tied", |
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predicate => "has_tied", |
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); |
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has backend_data => ( |
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is => "rw", |
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predicate => "has_backend_data", |
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clearer => "clear_backend_data", |
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); |
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86
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has prev => ( |
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isa => __PACKAGE__, |
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is => "rw", |
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predicate => "has_prev", |
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clearer => "clear_prev", |
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); |
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93
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sub root_prev { |
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my $self = shift; |
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96
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if ( $self->has_prev ) { |
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return $self->prev->root_prev; |
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} else { |
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return $self; |
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} |
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} |
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103
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has object => ( |
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traits => [qw(NoClone)], |
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is => "rw", |
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weak_ref => 1, |
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predicate => "has_object", |
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clearer => "clear_object", |
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); |
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111
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sub deletion_entry { |
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my $self = shift; |
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114
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( ref $self )->new( |
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id => $self->id, |
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prev => $self, |
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deleted => 1, |
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( $self->has_object ? ( object => $self->object ) : () ), |
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( $self->has_backend_data ? ( backend_data => $self->backend_data ) : () ), |
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); |
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} |
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123
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sub derive { |
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my ( $self, @args ) = @_; |
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126
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$self->clone( |
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prev => $self, |
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@args, |
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); |
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} |
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132
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has _references => ( |
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traits => [qw(NoClone)], |
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isa => "ArrayRef", |
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is => "ro", |
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lazy_build => 1, |
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); |
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139
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sub _build__references { |
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my $self = shift; |
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142
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no warnings 'uninitialized'; |
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if ( $self->class eq 'KiokuDB::Set::Stored' ) { # FIXME should the typemap somehow handle this? |
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return [ map { KiokuDB::Reference->new( id => $_ ) } @{ $self->data } ]; |
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} else { |
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my @refs; |
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148
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my @queue = $self->data; |
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150
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while ( @queue ) { |
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my $next = pop @queue; |
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153
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my $ref = ref $next; |
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if ( $ref eq 'HASH' ) { |
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push @queue, grep { ref } values %$next; |
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} elsif ( $ref eq 'ARRAY' ) { |
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push @queue, grep { ref } @$next; |
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} elsif ( $ref eq 'KiokuDB::Entry' ) { |
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push @refs, $next->references; |
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} elsif ( $ref eq 'KiokuDB::Reference' ) { |
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push @refs, $next; |
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} |
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} |
164
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165
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return \@refs; |
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} |
167
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} |
168
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169
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sub references { |
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my $self = shift; |
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172
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return @{ $self->_references }; |
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} |
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175
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has _referenced_ids => ( |
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traits => [qw(NoClone)], |
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isa => "ArrayRef", |
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is => "ro", |
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lazy_build => 1, |
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); |
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182
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sub _build__referenced_ids { |
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my $self = shift; |
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185
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no warnings 'uninitialized'; |
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if ( $self->class eq 'KiokuDB::Set::Stored' ) { # FIXME should the typemap somehow handle this? |
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return $self->data; |
188
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} else { |
189
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return [ map { $_->id } $self->references ]; |
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} |
191
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} |
192
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193
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sub referenced_ids { |
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my $self = shift; |
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196
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@{ $self->_referenced_ids }; |
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} |
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199
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use constant _version => 1; |
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201
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use constant _root_b => 0x01; |
202
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use constant _deleted_b => 0x02; |
203
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204
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use constant _tied_shift => 2; |
205
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use constant _tied_mask => 0x03 << _tied_shift; |
206
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207
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my %tied; @tied{@tied} = ( 1 .. scalar(@tied) ); |
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209
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sub _pack { |
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my $self = shift; |
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212
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my $flags = 0; |
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214
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$flags |= _root_b if $self->root; |
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$flags |= _deleted_b if $self->deleted; |
216
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217
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if ( $self->has_tied ) { |
218
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$flags |= $tied{$self->tied} << _tied_shift; |
219
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} |
220
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221
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no warnings 'uninitialized'; |
222
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pack( "C C w/a* w/a*", _version, $flags, $self->id, $self->class ); |
223
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} |
224
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225
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sub _unpack { |
226
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my ( $self, $packed ) = @_; |
227
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228
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my ( $v, $body ) = unpack("C a*", $packed); |
229
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230
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if ( $v == _version ) { |
231
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my ( $flags, $id, $class, $extra ) = unpack("C w/a w/a a*", $body); |
232
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233
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return $self->_unpack_old($packed) if length($extra); |
234
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235
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$self->_id($id) if length($id); |
236
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237
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$self->_class($class) if length($class); |
238
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239
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$self->root($flags & _root_b); |
240
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$self->_deleted(1) if $flags & _deleted_b; |
241
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242
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if ( my $tied = ( $flags & _tied_mask ) >> _tied_shift ) { |
243
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$self->_tied( $tied[$tied - 1] ); |
244
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} |
245
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} else { |
246
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$self->_unpack_old($packed); |
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} |
248
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} |
249
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250
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251
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sub _pack_old { |
252
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my $self = shift; |
253
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254
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no warnings 'uninitialized'; |
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join(",", |
256
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$self->id, |
257
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!!$self->root, |
258
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$self->class, |
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$self->tied, |
260
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!!$self->deleted, |
261
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); |
262
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} |
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264
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sub _unpack_old { |
265
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my ( $self, $packed ) = @_; |
266
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267
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my ( $id, $root, $class, $tied, $deleted ) = split ',', $packed; |
268
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die "bad entry format: $packed" if $root and $root ne '1'; |
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die "bad entry format: $packed" if $deleted and $deleted ne '1'; |
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272
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$self->_id($id) if $id; |
273
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$self->root(1) if $root; |
274
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$self->_class($class) if $class; |
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$self->_tied(substr($tied, 0, 1)) if $tied; |
276
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$self->_deleted(1) if $deleted; |
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} |
278
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279
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sub STORABLE_freeze { |
280
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my ( $self, $cloning ) = @_; |
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282
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return ( |
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$self->_pack, |
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[ |
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( $self->has_data ? $self->data : undef ), |
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( $self->has_backend_data ? $self->backend_data : undef ), |
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( $self->has_class_meta ? $self->class_meta : undef ), |
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( $self->has_class_version ? $self->class_version : undef ), |
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], |
290
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); |
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} |
292
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293
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sub STORABLE_thaw { |
294
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my ( $self, $cloning, $attrs, $refs ) = @_; |
295
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296
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$self->_unpack($attrs); |
297
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298
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if ( $refs ) { |
299
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my ( $data, $backend_data, $meta, $version ) = @$refs; |
300
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$self->_data($data) if defined $data; |
301
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$self->backend_data($backend_data) if ref $backend_data; |
302
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$self->_class_meta($meta) if ref $meta; |
303
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$self->_class_version($version) if defined $version; |
304
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} |
305
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} |
306
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307
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__PACKAGE__->meta->make_immutable; |
308
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309
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__PACKAGE__ |
310
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311
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__END__ |
312
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313
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=pod |
314
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315
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=encoding UTF-8 |
316
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317
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|
=head1 NAME |
318
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319
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|
KiokuDB::Entry - An entry in the database |
320
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321
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|
=head1 VERSION |
322
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323
|
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|
|
version 0.57 |
324
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325
|
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|
|
=head1 SYNOPSIS |
326
|
|
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|
327
|
|
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|
|
KiokuDB::Entry->new( |
328
|
|
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|
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|
|
id => ..., |
329
|
|
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|
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|
|
data => ... |
330
|
|
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|
); |
331
|
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|
332
|
|
|
|
|
|
|
=head1 DESCRIPTION |
333
|
|
|
|
|
|
|
|
334
|
|
|
|
|
|
|
This object provides the meta data for a single storage entry. |
335
|
|
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|
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|
|
336
|
|
|
|
|
|
|
=head1 ATTRIBUTES |
337
|
|
|
|
|
|
|
|
338
|
|
|
|
|
|
|
=over 4 |
339
|
|
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|
|
|
|
|
340
|
|
|
|
|
|
|
=item id |
341
|
|
|
|
|
|
|
|
342
|
|
|
|
|
|
|
The UUID for the entry. |
343
|
|
|
|
|
|
|
|
344
|
|
|
|
|
|
|
If there is no ID then the entry is intrinsic. |
345
|
|
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|
|
|
|
|
346
|
|
|
|
|
|
|
=item root |
347
|
|
|
|
|
|
|
|
348
|
|
|
|
|
|
|
Whether or not this is a member of the root set (not subject to garbage |
349
|
|
|
|
|
|
|
collection, because storage was explicitly requested). |
350
|
|
|
|
|
|
|
|
351
|
|
|
|
|
|
|
=item data |
352
|
|
|
|
|
|
|
|
353
|
|
|
|
|
|
|
A simplified data structure modeling this object/reference. This is a tree, not |
354
|
|
|
|
|
|
|
a graph, and has no shared data (JSON compliant). All references are symbolic, |
355
|
|
|
|
|
|
|
using a L<KiokuDB::Reference> object with UIDs as the |
356
|
|
|
|
|
|
|
address space. |
357
|
|
|
|
|
|
|
|
358
|
|
|
|
|
|
|
=item class |
359
|
|
|
|
|
|
|
|
360
|
|
|
|
|
|
|
If the entry is blessed, this contains the class of that object. |
361
|
|
|
|
|
|
|
|
362
|
|
|
|
|
|
|
In the future this might be a complex structure for anonymous classes, e.g. the |
363
|
|
|
|
|
|
|
class and the runtime roles. |
364
|
|
|
|
|
|
|
|
365
|
|
|
|
|
|
|
=item class_meta |
366
|
|
|
|
|
|
|
|
367
|
|
|
|
|
|
|
Optional information such as runtime roles to be applied to the object is |
368
|
|
|
|
|
|
|
stored in this hashref. |
369
|
|
|
|
|
|
|
|
370
|
|
|
|
|
|
|
=item tied |
371
|
|
|
|
|
|
|
|
372
|
|
|
|
|
|
|
One of C<HASH>, C<ARRAY>, C<SCALAR> or C<GLOB>. |
373
|
|
|
|
|
|
|
|
374
|
|
|
|
|
|
|
C<data> is assumed to be a reference or an intrinsic entry for the object |
375
|
|
|
|
|
|
|
driving the tied structure (e.g. the C<tied(%hash)>). |
376
|
|
|
|
|
|
|
|
377
|
|
|
|
|
|
|
=item prev |
378
|
|
|
|
|
|
|
|
379
|
|
|
|
|
|
|
Contains a link to a L<KiokuDB::Entry> objects that precedes this one. |
380
|
|
|
|
|
|
|
|
381
|
|
|
|
|
|
|
The last entry that was loaded from the store, or successfully written to the |
382
|
|
|
|
|
|
|
store for a given UUID is kept in the live object set. |
383
|
|
|
|
|
|
|
|
384
|
|
|
|
|
|
|
The collapser creates transient Entry objects, which if written to the store |
385
|
|
|
|
|
|
|
successfully replace the previous one. |
386
|
|
|
|
|
|
|
|
387
|
|
|
|
|
|
|
=item backend_data |
388
|
|
|
|
|
|
|
|
389
|
|
|
|
|
|
|
Backends can use this to store additional meta data as they see fit. |
390
|
|
|
|
|
|
|
|
391
|
|
|
|
|
|
|
For instance, this is used in the CouchDB backend to track entry revisions for |
392
|
|
|
|
|
|
|
the opportunistic locking, and in L<KiokuDB::Backend::BDB::GIN> to to store |
393
|
|
|
|
|
|
|
extracted keys. |
394
|
|
|
|
|
|
|
|
395
|
|
|
|
|
|
|
=item deleted |
396
|
|
|
|
|
|
|
|
397
|
|
|
|
|
|
|
Used for marking entries for deletion. |
398
|
|
|
|
|
|
|
|
399
|
|
|
|
|
|
|
Deletion entries can be generated using the C<deletion_entry> method, which |
400
|
|
|
|
|
|
|
creates a new derived entry with no data but retaining the ID. |
401
|
|
|
|
|
|
|
|
402
|
|
|
|
|
|
|
=back |
403
|
|
|
|
|
|
|
|
404
|
|
|
|
|
|
|
=head1 AUTHOR |
405
|
|
|
|
|
|
|
|
406
|
|
|
|
|
|
|
Yuval Kogman <nothingmuch@woobling.org> |
407
|
|
|
|
|
|
|
|
408
|
|
|
|
|
|
|
=head1 COPYRIGHT AND LICENSE |
409
|
|
|
|
|
|
|
|
410
|
|
|
|
|
|
|
This software is copyright (c) 2014 by Yuval Kogman, Infinity Interactive. |
411
|
|
|
|
|
|
|
|
412
|
|
|
|
|
|
|
This is free software; you can redistribute it and/or modify it under |
413
|
|
|
|
|
|
|
the same terms as the Perl 5 programming language system itself. |
414
|
|
|
|
|
|
|
|
415
|
|
|
|
|
|
|
=cut |