package KinoSearch1::Store::RAMLock;
use strict;
use warnings;
use KinoSearch1::Util::ToolSet;
use base qw( KinoSearch1::Store::Lock );

BEGIN { __PACKAGE__->init_instance_vars() }

sub do_obtain {
    my $self = shift;

    # bail if the virtual lockfile already exists
    return if $self->{invindex}->file_exists( $self->{lock_name} );

    # create a virtual lockfile
    my $temp = $self->{invindex}->open_outstream( $self->{lock_name} );
    $temp->close;
    return 1;
}

sub release {
    my $self = shift;

    # delete the virtual lockfile
    $self->{invindex}->delete_file( $self->{lock_name} );
}

sub is_locked {
    my $self = shift;
    return $self->{invindex}->file_exists( $self->{lock_name} );
}

1;

__END__

==begin devdocs

==head1 NAME

KinoSearch1::Store::RAMLock - lock a RAMInvIndex

==head1 DESCRIPTION

Implementation of KinoSearch1::Store::Lock entirely in memory.

==head1 COPYRIGHT

Copyright 2005-2010 Marvin Humphrey

==head1 LICENSE, DISCLAIMER, BUGS, etc.

See L<KinoSearch1> version 1.01.

==end devdocs
==cut