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package LXRng::Cached;
use strict;
require Exporter;
use vars qw($memcached @ISA @EXPORT);
@ISA = qw(Exporter);
@EXPORT = qw(cached);
BEGIN {
eval { require Cache::Memcached;
require Storable;
require Digest::SHA1;
};
if ($@ eq '') {
$memcached = Cache::Memcached->new({
'servers' => ['127.0.0.1:11211']});
$memcached = undef
unless ($memcached->set(':lxrng_caching' => 1))
}
}
# Caches result from block enclosed by cache { ... }. File/linenumber
# of the "cache" keyword is used as the caching key. If additional
# arguments are given after the sub to cache, they are used to further
# specify the caching key. Otherwise, the arguments supplied to the
# function containing the call to cached are used.
sub cached(&;@);
*cached = \&DB::LXRng_Cached_cached;
package DB;
sub LXRng_Cached_cached(&;@) {
my ($func, @args) = @_;
if ($LXRng::Cached::memcached) {
my ($pkg, $file, $line) = caller(0);
my $params;
if (@args > 0) {
$params = Storable::freeze(\@args);
}
else {
my @caller = caller(1);
$params = Storable::freeze(\@DB::args);
}
my $key = ':lxrng:'.
Digest::SHA1::sha1_hex(join("\0", $file, $line, $params));
my $val = $LXRng::Cached::memcached->get($key);
unless ($val) {
$val = [$func->()];
$LXRng::Cached::memcached->set($key, $val);
warn "cache miss for $key";
}
else {
warn "cache hit for $key";
}
return @$val;
}
else {
return $func->();
}
}
1;
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