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<?php
namespace ICanBoogie\CLDR\Provider;
use ICanBoogie\CLDR\Provider;
class CachedProvider implements Provider
{
private $provider;
private $retrieve;
private $store;
private $cache = [];
public function __construct(Provider $provider, callable $retrieve = null, callable $store = null)
{
$this->provider = $provider;
$this->retrieve = $retrieve ?: function () {};
$this->store = $store ?: function () {};
}
public function provide($path)
{
$data = $this->retrieve($path);
if ($data !== null)
{
return $data;
}
$data = $this->provider->provide($path);
$this->store($path, $data);
return $data;
}
private function retrieve($path)
{
$data = &$this->cache[$path];
if ($data !== null)
{
return $data;
}
return $data = call_user_func($this->retrieve, $path);
}
private function store($path, $data)
{
$this->cache[$path] = $data;
call_user_func($this->store, $path, $data);
}
}