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