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<?php

namespace League\Flysystem\Cached\Storage;

use Predis\Client;

class Predis extends AbstractCache
{
    /**
     * @var \Predis\Client Predis Client
     */
    protected $client;

    /**
     * @var string storage key
     */
    protected $key;

    /**
     * @var int|null seconds until cache expiration
     */
    protected $expire;

    /**
     * Constructor.
     *
     * @param \Predis\Client $client predis client
     * @param string         $key    storage key
     * @param int|null       $expire seconds until cache expiration
     */
    public function __construct(Client $client = null, $key = 'flysystem', $expire = null)
    {
        $this->client = $client ?: new Client();
        $this->key = $key;
        $this->expire = $expire;
    }

    /**
     * {@inheritdoc}
     */
    public function load()
    {
        if (($contents = $this->executeCommand('get', [$this->key])) !== null) {
            $this->setFromStorage($contents);
        }
    }

    /**
     * {@inheritdoc}
     */
    public function save()
    {
        $contents = $this->getForStorage();
        $this->executeCommand('set', [$this->key, $contents]);

        if ($this->expire !== null) {
            $this->executeCommand('expire', [$this->key, $this->expire]);
        }
    }

    /**
     * Execute a Predis command.
     *
     * @param string $name
     * @param array  $arguments
     *
     * @return string
     */
    protected function executeCommand($name, array $arguments)
    {
        $command = $this->client->createCommand($name, $arguments);

        return $this->client->executeCommand($command);
    }
}