CRM/Utils/Cache/NoCache.php

   1 <?php
   2 /*
   3  +--------------------------------------------------------------------+
   4  | CiviCRM version 5                                                  |
   5  +--------------------------------------------------------------------+
   6  | Copyright CiviCRM LLC (c) 2004-2018                                |
   7  +--------------------------------------------------------------------+
   8  | This file is a part of CiviCRM.                                    |
   9  |                                                                    |
  10  | CiviCRM is free software; you can copy, modify, and distribute it  |
  11  | under the terms of the GNU Affero General Public License           |
  12  | Version 3, 19 November 2007 and the CiviCRM Licensing Exception.   |
  13  |                                                                    |
  14  | CiviCRM is distributed in the hope that it will be useful, but     |
  15  | WITHOUT ANY WARRANTY; without even the implied warranty of         |
  16  | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.               |
  17  | See the GNU Affero General Public License for more details.        |
  18  |                                                                    |
  19  | You should have received a copy of the GNU Affero General Public   |
  20  | License and the CiviCRM Licensing Exception along                  |
  21  | with this program; if not, contact CiviCRM LLC                     |
  22  | at info[AT]civicrm[DOT]org. If you have questions about the        |
  23  | GNU Affero General Public License or the licensing of CiviCRM,     |
  24  | see the CiviCRM license FAQ at http://civicrm.org/licensing        |
  25  +--------------------------------------------------------------------+
  26  */
  27
  28 /**
  29  *
  30  * @package CRM
  31  * @copyright CiviCRM LLC (c) 2004-2018
  32  */
  33 class CRM_Utils_Cache_NoCache implements CRM_Utils_Cache_Interface {
  34
  35   use CRM_Utils_Cache_NaiveMultipleTrait; // TODO Consider native implementation.
  36   use CRM_Utils_Cache_NaiveHasTrait; // TODO Native implementation
  37
  38   /**
  39    * We only need one instance of this object. So we use the singleton
  40    * pattern and cache the instance in this variable
  41    *
  42    * @var object
  43    */
  44   static private $_singleton = NULL;
  45
  46   /**
  47    * Constructor.
  48    *
  49    * @param array $config
  50    *   An array of configuration params.
  51    *
  52    * @return \CRM_Utils_Cache_NoCache
  53    */
  54   public function __construct($config) {
  55   }
  56
  57   /**
  58    * @param string $key
  59    * @param mixed $value
  60    * @param null|int|\DateInterval $ttl
  61    *
  62    * @return bool
  63    */
  64   public function set($key, $value, $ttl = NULL) {
  65     return FALSE;
  66   }
  67
  68   /**
  69    * @param string $key
  70    * @param mixed $default
  71    *
  72    * @return null
  73    */
  74   public function get($key, $default = NULL) {
  75     return $default;
  76   }
  77
  78   /**
  79    * @param string $key
  80    *
  81    * @return bool
  82    */
  83   public function delete($key) {
  84     return FALSE;
  85   }
  86
  87   /**
  88    * @return bool
  89    */
  90   public function flush() {
  91     return FALSE;
  92   }
  93
  94   public function clear() {
  95     return $this->flush();
  96   }
  97
  98 }