use Storable;
use Fcntl qw(:flock)

sub _store {
    my $data = shift;
    my $data_file = 'data/plugin_portfolio';

    store $data, $data_file;
    close LOCK;
}

sub _retrieve {
    my $data_file = 'data/plugin_portfolio';
    return 0 if !-f $data_file;

    my $lock = $data_file . '.lck';
    open (LOCK, "> $lock") or die "Can't open lock file";
    flock(LOCK, LOCK_EX);

    retrieve $data_file;
}