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# (c) Sound Object Logic 2000-2001 |
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# not implemented yet |
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__END__ |
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package Tangram::IntrHash; |
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use base qw( Tangram::AbstractHash ); |
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use Carp; |
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sub reschema |
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{ |
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my ($self, $members, $class, $schema) = @_; |
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foreach my $member (keys %$members) |
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{ |
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my $def = $members->{$member}; |
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unless (ref($def)) |
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{ |
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$def = { class => $def }; |
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$members->{$member} = $def; |
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} |
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$def->{coll} ||= $class . "_$member"; |
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$def->{slot} ||= $class . "_$member" . "_slot"; |
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$schema->{classes}{$def->{class}}{stateless} = 0; |
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} |
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return keys %$members; |
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} |
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sub defered_save |
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{ |
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use integer; |
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my ($self, $storage, $obj, $members, $coll_id) = @_; |
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my $classes = $storage->{schema}{classes}; |
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my $old_states = $storage->{scratch}{ref($self)}{$coll_id}; |
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foreach my $member (keys %$members) |
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{ |
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next if tied $obj->{$member}; |
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next unless exists $obj->{$member} && defined $obj->{$member}; |
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|
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my $def = $members->{$member}; |
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my $item_classdef = $classes->{$def->{class}}; |
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my $table = $item_classdef->{table} or die; |
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my $item_col = $def->{coll}; |
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my $slot_col = $def->{slot}; |
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|
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my $coll_id = $storage->id($obj); |
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my $coll = $obj->{$member}; |
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my $coll_size = @$coll; |
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my @new_state = (); |
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my $old_state = $old_states->{$member}; |
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my $old_size = $old_state ? @$old_state : 0; |
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my %removed; |
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@removed{ @$old_state } = () if $old_state; |
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my $slot = 0; |
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while ($slot < $coll_size) |
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{ |
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my $item_id = $storage->id( $coll->[$slot] ) || die; |
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$storage->sql_do("UPDATE $table SET $item_col = $coll_id, $slot_col = $slot WHERE id = $item_id") |
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unless $slot < $old_size && $item_id eq $old_state->[$slot]; |
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push @new_state, $item_id; |
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delete $removed{$item_id}; |
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++$slot; |
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} |
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|
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if (keys %removed) |
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{ |
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my $removed = join(' ', keys %removed); |
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$storage->sql_do("UPDATE $table SET $item_col = NULL, $slot_col = NULL WHERE id IN ($removed)"); |
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} |
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$old_states->{$member} = \@new_state; |
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$storage->tx_on_rollback( sub { $old_states->{$member} = $old_state } ); |
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} |
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} |
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sub erase |
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{ |
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my ($self, $storage, $obj, $members, $coll_id) = @_; |
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foreach my $member (keys %$members) |
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{ |
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next if tied $obj->{$member}; |
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my $def = $members->{$member}; |
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my $item_classdef = $storage->{schema}{$def->{class}}; |
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my $table = $item_classdef->{table} || $def->{class}; |
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my $item_col = $def->{coll}; |
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my $slot_col = $def->{slot}; |
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my $sql = "UPDATE $table SET $item_col = NULL, $slot_col = NULL WHERE $item_col = $coll_id"; |
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$storage->sql_do($sql); |
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} |
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} |
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sub cursor |
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{ |
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my ($self, $def, $storage, $obj, $member) = @_; |
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my $cursor = Tangram::CollCursor->new($storage, $def->{class}, $storage->{db}); |
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my $item_col = $def->{coll}; |
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my $slot_col = $def->{slot}; |
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my $coll_id = $storage->id($obj); |
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my $tid = $cursor->{-stored}->{table_hash}{$def->{class}}; # ->leaf_table; |
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$cursor->{-coll_cols} = "t$tid.$slot_col"; |
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$cursor->{-coll_where} = "t$tid.$item_col = $coll_id"; |
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return $cursor; |
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} |
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sub query_expr |
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{ |
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my ($self, $obj, $members, $tid) = @_; |
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map { Tangram::IntrCollExpr->new($obj, $_); } values %$members; |
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} |
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sub remote_expr |
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{ |
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my ($self, $obj, $tid) = @_; |
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Tangram::IntrCollExpr->new($obj, $self); |
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} |
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sub prefetch |
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{ |
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my ($self, $storage, $def, $coll, $class, $member, $filter) = @_; |
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my $ritem = $storage->remote($def->{class}); |
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my $prefetch = $storage->{PREFETCH}{$class}{$member} ||= {}; # weakref |
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my $cursor = Tangram::Cursor->new($storage, $ritem, $storage->{db}); |
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my $includes = $coll->{$member}->includes($ritem); |
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$includes &= $filter if $filter; |
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# also retrieve collection-side id and index of elmt in sequence |
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$cursor->retrieve($coll->{id}, |
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Tangram::Expr->new("t$ritem->{object}{table_hash}{$def->{class}}.$def->{slot}", Tangram::Integer->instance() ); |
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$cursor->select($includes); |
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while (my $item = $cursor->current) |
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{ |
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my ($coll_id, $slot) = $cursor->residue; |
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$prefetch->{$coll_id}[$slot] = $item; |
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$cursor->next; |
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} |
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} |
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$Tangram::Schema::TYPES{iarray} = Tangram::IntrHash->new; |
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1; |
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