1 package DBIx::Data::Collection::Set;
4 use Method::Signatures::Simple;
5 use Data::Perl::Stream::Array;
7 has _store => (is => 'ro', required => 1, init_arg => 'store');
9 has _class => (is => 'ro', predicate => '_has_class');
11 has _set_over => (is => 'ro', required => 1, init_arg => 'set_over');
13 ## member cache (all members)
15 has _member_cache => (
16 is => 'rw', lazy_build => 1,
17 predicate => '_member_cache_built',
20 method _build__member_cache {
21 my $stream = $self->_new_raw_stream;
23 while (my ($raw) = $stream->next) {
25 if (my ($obj) = $self->_key_cache_get_raw($raw)) {
26 $self->_merge($obj, $raw)
28 $self->_add_to_key_cache($self->_inflate($raw))
36 method _add_to_member_cache ($to_add) {
37 return $to_add unless $self->_member_cache_built;
38 push @{$self->_member_cache}, $to_add;
42 method _remove_from_member_cache ($to_remove) {
43 return $to_remove unless $self->_member_cache_built;
44 @{$self->_member_cache} = grep $_ ne $to_remove, @{$self->_member_cache};
48 ## key cache - by primary/unique key
50 has _key_cache => (is => 'ro', default => sub { {} });
52 method _add_to_key_cache ($to_add) {
53 $self->_key_cache->{$self->_object_to_id($to_add)} = $to_add;
57 method _remove_from_key_cache ($to_remove) {
58 # should return $to_remove
59 delete $self->_key_cache->{$self->_object_to_id($to_remove)}
62 method _key_cache_has_raw ($raw) {
63 exists $self->_key_cache->{$self->_raw_to_id($raw)}
66 method _key_cache_has_object ($obj) {
67 exists $self->_key_cache->{$self->_object_to_id($obj)}
70 method _key_cache_get_raw ($raw) {
71 $self->_key_cache_get_id($self->_raw_to_id($raw))
74 method _key_cache_get_object ($obj) {
75 $self->_key_cache_get_id($self->_object_to_id($obj))
78 method _key_cache_get_object_spec ($spec) {
79 # see _object_spec_to_id for doc of what the difference is
80 $self->_key_cache_get_id($self->_object_spec_to_id($spec))
83 method _key_cache_get_id ($id) {
84 exists $self->_key_cache->{$id}
85 ? ($self->_key_cache->{$id})
89 ## thunking between the store representation and the set representation
91 # _inflate is raw data -> final repr
92 # _deflate is final repr -> raw data
93 # _merge takes final repr + raw data and updates the repr
94 # (this is used for pk-generated values and later lazy loading)
96 # _deflate_spec is attributes of final repr -> raw data
98 method _inflate ($raw) {
99 bless($raw, $self->_class) if $self->_has_class;
103 method _deflate ($obj) {
107 method _merge ($obj, $raw) {
108 @{$obj}{keys %$raw} = values %$raw;
112 method _deflate_spec ($spec) {
116 ## methods to get ids
118 method _raw_to_id ($raw) {
119 # XXX must escape this. or do something else.
120 join ';', map $raw->{$_}, @{$self->_set_over}
123 method _object_to_id ($obj) {
124 $self->_raw_to_id($self->_deflate($obj))
127 method _object_spec_to_id ($spec) {
128 # intentionally C&P from _raw_to - this is not the same thing. If a column
129 # were mapped to an attribute of a different name, the raw would have the
130 # column name as a key but an object spec would have the attribute name
131 join ';', map $spec->{$_}, @{$self->_set_over}
134 ## array-ish operations - i.e. get all members
136 method _new_raw_stream {
137 $self->_store->new_select_command([])->execute
141 @{$self->_member_cache};
145 Data::Perl::Stream::Array->new(array => $self->_member_cache);
151 if (my ($got) = $self->_key_cache_get_object_spec($spec)) {
154 if (my ($raw) = $self->_get_from_store($self->_deflate_spec($spec))) {
155 return $self->_add_to_key_cache($self->_inflate($raw))
157 return undef # we aren't handling cache misses here yet
160 method _get_from_store ($raw) {
161 $self->_store->new_select_single_command($raw)->execute
167 $self->_add_to_store($new);
168 $self->_add_to_caches($new);
172 method _add_to_store ($new) {
173 my $new_raw = $self->_deflate($new);
174 $self->_merge($new, $self->_store->new_insert_command($new_raw)->execute);
178 method _add_to_caches ($new) {
179 $self->_add_to_member_cache($new);
180 $self->_add_to_key_cache($new);
186 method remove ($old) {
187 $self->_remove_from_store($old);
188 $self->_remove_from_caches($old);
192 method _remove_from_store ($old) {
193 $self->_store->new_delete_command($self->_deflate($old))->execute
196 method _remove_from_caches ($old) {
197 $self->_remove_from_member_cache($old);
198 $self->_remove_from_key_cache($old);
204 method _update_in_store ($obj) {
205 # this is currently a call command but we should think about it
206 # being a row command so that we can have RETURNING or other
207 # mechanisms handle things like set-on-update datetime values
208 $self->_store->new_update_command($self->_deflate($obj))->execute