has _class => (is => 'ro', predicate => '_has_class');
-has _member_cache => (is => 'rw', lazy_build => 1);
+has _set_over => (is => 'ro', required => 1, init_arg => 'set_over');
+
+## member cache (all members)
+
+has _member_cache => (
+ is => 'rw', lazy_build => 1,
+ predicate => '_member_cache_built',
+);
method _build__member_cache {
my $stream = $self->_new_raw_stream;
my @cache;
while (my ($raw) = $stream->next) {
- push @cache, $self->_inflate($raw);
+ my $obj = do {
+ if (my ($obj) = $self->_key_cache_get_raw($raw)) {
+ $self->_merge($obj, $raw)
+ } else {
+ $self->_add_to_key_cache($self->_inflate($raw))
+ }
+ };
+ push @cache, $obj;
}
- \@cache;
+ \@cache
}
+method _add_to_member_cache ($to_add) {
+ return unless $self->_member_cache_built;
+ push @{$self->_member_cache}, $to_add;
+ $to_add
+}
+
+## key cache - by primary/unique key
+
+has _key_cache => (is => 'ro', default => sub { {} });
+
+method _add_to_key_cache ($to_add) {
+ $self->_key_cache->{$self->_object_to_id($to_add)} = $to_add;
+ $to_add
+}
+
+method _key_cache_has_raw ($raw) {
+ exists $self->_key_cache->{$self->_raw_to_id($raw)}
+}
+
+method _key_cache_has_object ($obj) {
+ exists $self->_key_cache->{$self->_object_to_id($obj)}
+}
+
+method _key_cache_get_raw ($raw) {
+ my $id = $self->_raw_to_id($raw);
+ exists $self->_key_cache->{$id}
+ ? ($self->_key_cache->{$id})
+ : ()
+}
+
+method _key_cache_get_object ($obj) {
+ $self->_key_cache_get_raw($self->_deflate($obj))
+}
+
+## loading data
+
method _new_raw_stream {
$self->_store->new_select_command([])->execute;
}
+## thunking between the store representation and the set representation
+#
+# _inflate is raw data -> final repr
+# _deflate is final repr -> raw data
+# _merge takes final repr + raw data and updates the repr
+# (this is used for pk-generated values and later lazy loading)
+
method _inflate ($raw) {
bless($raw, $self->_class) if $self->_has_class;
$raw;
}
+method _deflate ($obj) {
+ +{ %$obj }
+}
+
+method _merge ($obj, $raw) {
+ @{$obj}{keys %$raw} = values %$raw;
+ $obj;
+}
+
+## methods to get ids
+
+method _raw_to_id ($raw) {
+ # XXX must escape this. or do something else.
+ join ';', map $raw->{$_}, @{$self->_set_over}
+}
+
+method _object_to_id ($obj) {
+ $self->_raw_to_id($self->_deflate($obj));
+}
+
method flatten {
@{$self->_member_cache};
}
Data::Perl::Stream::Array->new(array => $self->_member_cache);
}
+method add ($new) {
+ $self->_add_to_store($new);
+ $self->_add_to_caches($new);
+ $new;
+}
+
+method _add_to_store ($new) {
+ my $new_raw = $self->_deflate($new);
+ $self->_merge($new, $self->_store->new_insert_command($new_raw)->execute);
+ $new;
+}
+
+method _add_to_caches ($new) {
+ $self->_add_to_member_cache($new);
+ $self->_add_to_key_cache($new);
+ $new
+}
+
1;