<?php

/**

* Copyright 2014 Openstack Foundation

* 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.

**/

/**

* Class EntityCounterHelper

*/

final class EntityCounterHelper {

/**

* @var EntityCounterHelper

*/

private static $instance;

private function __construct(){}

private function __clone(){}

/**

* @return EntityCounterHelper

*/

public static function getInstance(){

if(!is_object(self::$instance)){

self::$instance = new EntityCounterHelper();

}

return self::$instance;

}

public function EntityCount($entity_name, callable $payload_function=null){

$cache = SS_Cache::factory('cache_entity_count');

$result = unserialize($cache->load('var_'.$entity_name));

if(!$result){

if($payload_function==null){

$sqlQuery = new SQLQuery(

"COUNT(ID)",

array($entity_name)

);

$result = $sqlQuery->execute()->value();

}

else{

$result = $payload_function();

}

$cache->save(serialize($result), 'var_'.$entity_name);

}

if(Director::is_ajax()){

return json_encode($result);

}

return $result;

}

}