StashPool.php

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<?php
namespace Elgg\Cache;

use Stash;

final class StashPool implements Pool {

    private $stash;

    public function __construct(Stash\Pool $stash) {
        $this->stash = $stash;
    }

    public function get($key, callable $callback) {
        assert(is_string($key) || is_int($key));

        $item = $this->stash->getItem((string)$key);

        $result = $item->get();

        if ($item->isMiss()) {
            $item->lock();

            $result = call_user_func($callback);

            $this->stash->save($item->set($result));
        }

        return $result;
    }

    public function invalidate($key) {
        assert(is_string($key) || is_int($key));
        
        $this->stash->getItem((string)$key)->clear();
    }
    
    public function put($key, $value) {
        assert(is_string($key) || is_int($key));

        $this->stash->getItem((string)$key)->set($value);
    }
    
    public static function createEphemeral() {
        return new self(new Stash\Pool(new Stash\Driver\Ephemeral()));
    }
}