InMemory.php

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<?php
namespace Elgg\Cache\Pool;

use Elgg\Cache\Pool;
use Stash;

final class InMemory implements Pool {
    private $values = array();
    
    public function get($key, callable $callback = null, $default = null) {
        assert(is_string($key) || is_int($key));

        if (!array_key_exists($key, $this->values)) {
            if (!$callback) {
                return $default;
            }
            $this->values[$key] = call_user_func($callback);
        }
        return $this->values[$key];
    }
    
    public function invalidate($key) {
        assert(is_string($key) || is_int($key));

        unset($this->values[$key]);
    }

    public function put($key, $value) {
        assert(is_string($key) || is_int($key));

        $this->values[$key] = $value;
    }
}