materio-base-d7/sites/all/modules/contrib/dev/redis/redis.module

<?php

/**
 * @file
 * Redis module.
 *
 * This file is a placeholder for other modules that need the Redis client for
 * something else than lock and cache.
 */

// Include our own autoloader to ensure classes to be there.
// We cannot rely on core in case of early bootstrap phases.
require_once dirname(__FILE__) . '/redis.autoload.inc';

/**
 * Implements hook_menu().
 */
function redis_menu() {
  $items = array();
  $items['admin/config/development/performance/cache'] = array(
    'title' => "Cache",
    'type' => MENU_DEFAULT_LOCAL_TASK,
  );
  $items['admin/config/development/performance/redis'] = array(
    'title' => "Redis",
    'page callback' => 'drupal_get_form',
    'page arguments' => array('redis_settings_form'),
    'access arguments' => array('administer site configuration'),
    'type' => MENU_LOCAL_TASK,
    'file' => 'redis.admin.inc',
  );
  return $items;
}

/**
 * Implements hook_help().
 */
function redis_help($path, $arg) {
  switch ($path) {
    case 'admin/config/development/performance/redis':
      $messages =
        '<p>' . t("Redis module is optional if you are using only a cache or lock backend. The full API will be automatically loaded and its configuration will live into the <em>settings.php</em> file. If you access to this screen, it's probably because another contrib module needs it as a dependency for using the Redis client. If you didn't enabled such module, you are strongly advised to disable the Redis module on the module page.") . '</p>' .
        '<p>' . t("While Redis client configuration can be changed through the web, if you are using a cache or lock backend they must be set in the <em>settings.php</em> file. Once this done, any modification done using this form will be ignored, and real settings in use will be get at early bootstrap phase, before the configuration system is bootstrapped.") . '</p>';
      if (Redis_Client::getClient()) {
        $messages .= '<p><strong>' . t("Current connected client uses the <em>@name</em> library.", array('@name' => Redis_Client::getClientInterfaceName())) . '</strong></p>';
      }
      return $messages;
  }
}

/**
 * Get Redis client for php-redis extension.
 *
 * @return \Redis
 */
function phpredis_client_get() {
  if ('PhpRedis' !== variable_get('redis_client_interface')) {
    throw new \LogicException("Redis is not configured to use the php-redis client");
  }
  return Redis_Client::getClient();
}

/**
 * Get Redis client for Predis library.
 *
 * @return \Predis\Client
 */
function predis_client_get() {
  if ('Predis' !== variable_get('redis_client_interface')) {
    throw new \LogicException("Redis is not configured to use the Predis client");
  }
  return Redis_Client::getClient();
}