<?php

namespace Pheanstalk\Command;

use Pheanstalk\Exception;
use Pheanstalk\Response;

/**
 * The 'touch' command.
 *
 * The "touch" command allows a worker to request more time to work on a job.
 * This is useful for jobs that potentially take a long time, but you still want
 * the benefits of a TTR pulling a job away from an unresponsive worker.  A worker
 * may periodically tell the server that it's still alive and processing a job
 * (e.g. it may do this on DEADLINE_SOON).
 *
 * @author  Paul Annesley
 * @package Pheanstalk
 * @license http://www.opensource.org/licenses/mit-license.php
 */
class TouchCommand
    extends AbstractCommand
    implements \Pheanstalk\ResponseParser
{
    private $_job;

    /**
     * @param Job $job
     */
    public function __construct($job)
    {
        $this->_job = $job;
    }

    /* (non-phpdoc)
     * @see Command::getCommandLine()
     */
    public function getCommandLine()
    {
        return sprintf('touch %u', $this->_job->getId());
    }

    /* (non-phpdoc)
     * @see ResponseParser::parseResponse()
     */
    public function parseResponse($responseLine, $responseData)
    {
        if ($responseLine == Response::RESPONSE_NOT_FOUND) {
            throw new Exception\ServerException(sprintf(
                'Job %u %s: does not exist or is not reserved by client',
                $this->_job->getId(),
                $responseLine
            ));
        }

        return $this->_createResponse($responseLine);
    }
}
