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<?php
/**
* Copyright 2012-2014 Rackspace US, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
namespace OpenCloud\Queues\Resource;
use OpenCloud\Common\PersistentObject;
/**
* A worker claims or checks out a message to perform a task. Doing so prevents
* other workers from attempting to process the same messages.
*/
class Claim extends PersistentObject
{
const LIMIT_DEFAULT = 10;
const GRACE_DEFAULT = 43200;
const TTL_DEFAULT = 43200;
/**
* @var string
*/
private $id;
/**
* @var int
*/
private $age;
/**
* @var array An array of messages.
*/
private $messages;
/**
* How long the server should wait before releasing the claim in seconds.
* The ttl value must be between 60 and 43200 seconds (12 hours is the
* default but is configurable).
*
* @var int
*/
private $ttl;
/**
* The message grace period in seconds. The value of grace must be between
* 60 and 43200 seconds (12 hours the default, but configurable). The server
* extends the lifetime of claimed messages to be at least as long as the
* lifetime of the claim itself, plus a specified grace period to deal with
* crashed workers (up to 1209600 or 14 days including claim lifetime). If a
* claimed message would normally live longer than the grace period, it's
* expiration will not be adjusted.
*
* @var int
*/
private $grace;
/**
* Link.
*
* @var string
*/
private $href;
protected static $url_resource = 'claims';
protected static $json_name = '';
/**
* Set the Href attribute and extrapolate the ID.
*
* @param $href
* @return $this
*/
public function setHref($href)
{
$paths = explode('/', $href);
$this->id = end($paths);
$this->href = $href;
return $this;
}
/**
* @return string
*/
public function getHref()
{
return $this->href;
}
/**
* @return string
*/
public function getId()
{
return $this->id;
}
public function create($params = array())
{
return $this->noCreate();
}
/**
* Updates the current Claim. It is recommended that you periodically renew
* claims during long-running batches of work to avoid losing a claim in
* the middle of processing a message. This is done by setting a new TTL for
* the claim (which may be different from the original TTL). The server will
* then reset the age of the claim and apply the new TTL.
* {@inheritDoc}
*/
public function update($params = array())
{
$grace = (isset($params['grace'])) ? $params['grace'] : $this->getGrace();
$ttl = (isset($params['ttl'])) ? $params['ttl'] : $this->getGrace();
$object = (object) array(
'grace' => (int) $grace,
'ttl' => (int) $ttl
);
$json = json_encode($object);
$this->checkJsonError();
return $this->getClient()->patch($this->url(), self::getJsonHeader(), $json)->send();
}
}