+package CWMP::Store::HASH;
+
+use strict;
+use warnings;
+
+use Data::Dump qw/dump/;
+use Hash::Merge qw/merge/;
+use Carp qw/confess/;
+
+=head1 NAME
+
+CWMP::Store::HASH - base class for hash based storage engines
+
+=head1 METHODS
+
+=head2 open
+
+ $store->open({
+ path => 'var/',
+ debug => 1,
+ clean => 1,
+ });
+
+=cut
+
+my $path;
+
+my $debug = 0;
+
+sub open {
+ my $self = shift;
+
+ my $args = shift;
+
+ $debug = $args->{debug};
+ $path = $args->{path} || confess "no path?";
+
+ warn "open ",dump( $args ) if $debug;
+
+ $path = $self->full_path( $path );
+
+ if ( ! -e $path ) {
+ mkdir $path || die "can't create $path: $!";
+ warn "created $path directory\n" if $debug;
+ } elsif ( $args->{clean} ) {
+ warn "removed old $path\n" if $debug;
+ foreach my $uid ( $self->all_uids ) {
+ my $file = $self->file( $uid );
+ unlink $file || die "can't remove $file: $!";
+ }
+ }
+
+
+}
+
+=head2 update_uid_state
+
+ $store->update_uid_state( $uid, $state );
+
+=cut
+
+sub update_uid_state {
+ my ( $self, $uid, $state ) = @_;
+
+ my $file = $self->file( $uid );
+
+ my $old_state = $self->get_state( $uid );
+
+ my $combined = merge( $state, $old_state );
+
+# warn "## ",dump( $old_state, $state, $combined );
+
+ $self->save_hash( $file, $combined ) || die "can't write $file: $!";
+
+}
+
+=head2 get_state
+
+ $store->get_state( $uid );
+
+=cut
+
+sub get_state {
+ my ( $self, $uid ) = @_;
+
+ my $file = $self->file( $uid );
+
+ if ( -e $file ) {
+ return $self->load_hash( $file );
+ }
+
+ return;
+}
+
+=head2 all_uids
+
+ my @uids = $store->all_uids;
+
+=cut
+
+sub all_uids {
+ my $self = shift;
+
+ my $ext = $self->extension;
+ warn "## extension: $ext";
+
+ opendir(my $d, $path) || die "can't opendir $path: $!";
+ my @uids = grep { $_ =~ m/\Q$ext\E$/ && -f "$path/$_" } readdir($d);
+ closedir $d;
+
+ return map { my $l = $_; $l =~ s/\Q$ext\E$//; $l } @uids;
+}
+
+1;