# make it so
	if (!defined $checker) {
	    $checker = sub { 1 };  # drop all of them
	}
	elsif (_looks_like_number($checker)) {
	    my $age_limit = $checker;
	    my $time_limit = time - $age_limit;
	    $reason ||= "older than $age_limit";
	    $checker = sub { $_[3] < $time_limit };
	}
	else {
	    my $type = $checker;
	    $reason ||= "drop $type";
	    $checker = sub { $_[1] eq $type };  # match on type
	}
    }
    $reason ||= "drop";

    local $SIG{__DIE__};  # don't interfere with eval below
    local $@;
    my @c;
    for (@{$self->{cc_conns}}) {
	my $drop;
	eval {
	    if (&$checker(@$_)) {
		$self->dropping($_, $reason);
		$drop++;
	    }
	};
	push(@c, $_) unless $drop;
    }
    @{$self->{cc_conns}} = @c;
}


sub prune {
    my $self = shift;
    $self->drop(sub { !shift->ping }, "ping");
}


sub get_types {
    my $self = shift;
    my %t;
    $t{$_->[1]}++ for @{$self->{cc_conns}};
    return keys %t;
}


sub get_connections {
    my($self, $type) = @_;
    my @c;
    for (@{$self->{cc_conns}}) {
	push(@c, $_->[0]) if !$type || ($type && $type eq $_->[1]);
    }
    @c;
}


sub _looks_like_number {
    $_[0] =~ /^([+-]?)(?=\d|\.\d)\d*(\.\d*)?([Ee]([+-]?\d+))?$/;
}

1;


__END__

=head1 NAME

LWP::ConnCache - Connection cache manager

=head1 NOTE

This module is experimental.  Details of its interface is likely to
change in the future.

=head1 SYNOPSIS

 use LWP::ConnCache;
 my $cache = LWP::ConnCache->new;
 $cache->deposit($type, $key, $sock);
 $sock = $cache->withdraw($type, $key);

=head1 DESCRIPTION

The C<LWP::ConnCache> class is the standard connection cache manager
for LWP::UserAgent.

The following basic methods are provided:

=over

=item $cache = LWP::ConnCache->new( %options )

This method constructs a new C<LWP::ConnCache> object.  The only
option currently accepted is 'total_capacity'.  If specified it
initialize the total_capacity option.  It defaults to the value 1.

=item $cache->total_capacity( [$num_connections] )