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package Catmandu::Store::Hash;
use namespace::clean;
use Catmandu::Sane;
use Catmandu::Util qw(:is);
use Moo;
with 'Catmandu::Store';
has _hashes => (is => 'ro' , lazy => 1, init_arg => undef, default => sub { +{} });
has init_data => (is => 'ro');
sub BUILD {
my $self = $_[0];
if (defined $self->init_data && is_array_ref($self->init_data) ) {
for (@{$self->init_data}) {
$self->bag->add($_);
}
}
}
package Catmandu::Store::Hash::Bag;
use namespace::clean;
use Catmandu::Sane;
use Catmandu::Hits;
use Moo;
use Clone qw(clone);
with 'Catmandu::Bag';
has _hash => (is => 'rw', lazy => 1 , init_arg => undef, builder => '_build_hash');
has _head => (is => 'rw', init_arg => undef, clearer => '_clear_head');
has _tail => (is => 'rw', init_arg => undef, clearer => '_clear_tail');
sub _build_hash {
my $self = $_[0];
$self->store->_hashes->{$self->name} ||= {};
}
sub generator {
my $self = $_[0];
sub {
state $node = $self->_head;
state $data;
$node || return;
$data = $node->[1];
$node = $node->[2];
$data;
};
}
sub get {
my ($self, $id) = @_;
my $node = $self->_hash->{$id} || return;
clone($node->[1]);
}
sub add {
my ($self, $data) = @_;
my $id = $data->{_id};
my $node = $self->_hash->{$id};
if ($node) {
$node->[1] = clone($data);
} elsif (my $tail = $self->_tail) {
$tail->[2] = $node = [$tail, clone($data), undef];
$self->_hash->{$id} = $node;
$self->_tail($node);
} else {
$node = [undef, clone($data), undef];
$self->_hash->{$id} = $node;
$self->_head($node);
$self->_tail($node);
}
$data;
}
sub delete {
my ($self, $id) = @_;
my $node = $self->_hash->{$id} || return;
if ($node->[0]) {
$node->[0][2] = $node->[2];
} else {
$self->_head($node->[2]);
}
if ($node->[2]) {
$node->[2][0] = $node->[0];
} else {
$self->_tail($node->[0]);
}
delete $self->_hash->{$id};
}
sub delete_all {
my $self = $_[0];
$self->_clear_head;
$self->_clear_tail;
$self->_hash($self->store->_hashes->{$self->name} = {});
}
1;
=head1 NAME
Catmandu::Store::Hash - An in-memory Catmandu::Store
=head1 SYNOPSIS
use Catmandu::Store::Hash;
my $store = Catmandu::Store::Hash->new();
my $obj1 = $store->bag->add({ name => 'Patrick' });
printf "obj1 stored as %s\n" , $obj1->{_id};
# Force an id in the store
my $obj2 = $store->bag->add({ _id => 'test123' , name => 'Nicolas' });
my $obj3 = $store->bag->get('test123');
$store->bag->delete('test123');
$store->bag->delete_all;
# All bags are iterators
$store->bag->each(sub { ... });
$store->bag->take(10)->each(sub { ... });
=head1 DESCRIPTION
A Catmandu::Store::Hash is an in-memory L<Catmandu::Store> backed by a hash
for fast retrieval combined with a doubly linked list for fast traversal.
=head1 METHODS
=head2 new()
Create a new Catmandu::Store::Hash
=head2 bag($name)
Create or retieve a bag with name $name. Returns a Catmandu::Bag.
=head1 SEE ALSO
L<Catmandu::Bag>, L<Catmandu::Searchable>
=cut
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