cache.inc in Views (for Drupal 7) 6.3

cache.inc

Functions to load Views' data so that it knows what is available to build queries from.

File

includes/cache.inc

<?php

/**
 * @file cache.inc
 *
 * Functions to load Views' data so that it knows what is available to
 * build queries from.
 */

/**
 * Load views files on behalf of modules.
 */
function _views_include_handlers($reset) {
  views_module_include('views.inc', $reset);
}

/**
 * Load default views files on behalf of modules.
 */
function _views_include_default_views() {
  views_module_include('views_default.inc');
}

/**
 * Fetch Views' data from the cache
 */
function _views_fetch_data($table = NULL, $reset = FALSE) {
  static $cache = NULL;
  if (!isset($cache) || $reset) {
    $start = views_microtime();

    // NOTE: This happens whether we retrieve them from cache or otherwise.
    views_include_handlers();
    $data = views_cache_get('views_data', TRUE);
    if (!empty($data->data)) {
      $cache = $data->data;
    }
    if (empty($cache)) {
      $cache = module_invoke_all('views_data');
      foreach (module_implements('views_data_alter') as $module) {
        $function = $module . '_views_data_alter';
        $function($cache);
      }
      views_cache_set('views_data', $cache, TRUE);
    }
    vpr('Views data build time: ' . (views_microtime() - $start) * 1000 . ' ms');
  }
  if (!$table) {
    return $cache;
  }
  if (isset($cache[$table])) {
    return $cache[$table];
  }

  // Return an empty array if there is no match.
  return array();
}

/**
 * Fetch the plugin data from cache.
 */
function _views_fetch_plugin_data($type = NULL, $plugin = NULL, $reset = FALSE) {
  static $cache = NULL;
  if (!isset($cache) || $reset) {
    $start = views_microtime();
    views_include_handlers();
    $cache = views_discover_plugins();
    vpr('Views plugins build time: ' . (views_microtime() - $start) * 1000 . ' ms');
  }
  if (!$type && !$plugin) {
    return $cache;
  }
  else {
    if (!$plugin) {

      // Not in the if above so the else below won't run
      if (isset($cache[$type])) {
        return $cache[$type];
      }
    }
    else {
      if (isset($cache[$type][$plugin])) {
        return $cache[$type][$plugin];
      }
    }
  }

  // Return an empty array if there is no match.
  return array();
}

/**
 * Scan all modules for default views and rebuild the default views cache.
 *
 * @return An associative array of all known default views.
 */
function _views_discover_default_views($reset = FALSE) {
  static $cache = NULL;
  if (!isset($cache) || $reset) {
    $index = views_cache_get('views_default_views_index', TRUE);

    // Retrieve each cached default view
    if (!$reset && isset($index->data) && is_array($index->data)) {
      $cache = array();
      foreach ($index->data as $view_name) {
        $data = views_cache_get('views_default:' . $view_name, TRUE);
        if (isset($data->data) && is_object($data->data)) {
          $cache[$view_name] = $data->data;
        }
      }
    }
    else {
      views_include_default_views();
      $cache = array();
      foreach (module_implements('views_default_views') as $module) {
        $results = call_user_func($module . "_views_default_views");
        if (!empty($results) && is_array($results)) {
          foreach ($results as $name => $view) {

            // Only views with a sufficiently high api version are eligible.
            if (!empty($view->api_version) && $view->api_version >= 2) {

              // Do not cache dead handlers.
              $view
                ->destroy();
              if (!isset($cache[$name])) {
                $cache[$name] = $view;
              }
              else {
                watchdog('view', "View name '@name' is already taken", array(
                  '@name' => $name,
                ), WATCHDOG_ERROR);
              }
            }
          }
        }
      }

      // Allow modules to modify default views before they are cached.
      drupal_alter('views_default_views', $cache);

      // Cache the index
      $index = array_keys($cache);
      views_cache_set('views_default_views_index', $index, TRUE);

      // Cache each view
      foreach ($cache as $name => $view) {
        views_cache_set('views_default:' . $name, $view, TRUE);
      }
    }
  }
  return $cache;
}

/**
 * Set a cached item in the views cache.
 *
 * This is just a convenience wrapper around cache_set().
 *
 * @param $cid
 *   The cache ID of the data to store.
 * @param $data
 *   The data to store in the cache. Complex data types will be automatically serialized before insertion.
 *   Strings will be stored as plain text and not serialized.
 * @param $use_language
 *   If TRUE, the data will be cached specific to the currently active language.
 */
function views_cache_set($cid, $data, $use_language = FALSE) {
  global $language;
  if (variable_get('views_skip_cache', FALSE)) {
    return;
  }
  if ($use_language) {
    $cid .= ':' . $language->language;
  }
  cache_set($cid, $data, 'cache_views');
}

/**
 * Return data from the persistent views cache.
 *
 * This is just a convenience wrapper around cache_get().
 *
 * @param $cid
 *   The cache ID of the data to retrieve.
 * @param $use_language
 *   If TRUE, the data will be requested specific to the currently active language.
 */
function views_cache_get($cid, $use_language = FALSE) {
  global $language;
  if (variable_get('views_skip_cache', FALSE)) {
    return 0;
  }
  if ($use_language) {
    $cid .= ':' . $language->language;
  }
  return cache_get($cid, 'cache_views');
}

/**
 * @defgroup views_object_cache Non-volatile cache storage
 * @{
 * The non-volatile object cache is used to store an object while it is
 * being edited, so that we don't have to save until we're completely
 * done. The cache should be 'cleaned' on a regular basis, meaning to
 * remove old objects from the cache, but otherwise the data in this
 * cache must remain stable, as it includes unsaved changes.
 */

/**
 * Get an object from the non-volatile Views cache.
 *
 * This function caches in memory as well, so that multiple calls to this
 * will not result in multiple database reads.
 *
 * @param $obj
 *   A 32 character or less string to define what kind of object is being
 *   stored; primarily this is used to prevent collisions.
 * @param $name
 *   The name of the view (or other object) being stored.
 * @param $skip_cache
 *   Skip the memory cache, meaning this must be read from the db again.
 *
 * @return
 *   The data that was cached.
 */
function views_object_cache_get($obj, $name, $skip_cache = FALSE) {
  static $cache = array();
  $key = "{$obj}:{$name}";
  if ($skip_cache) {
    unset($cache[$key]);
  }
  if (!array_key_exists($key, $cache)) {
    $data = db_fetch_object(db_query("SELECT * FROM {views_object_cache} WHERE sid = '%s' AND obj = '%s' AND name = '%s'", session_id(), $obj, $name));
    if ($data) {
      $cache[$key] = unserialize($data->data);
    }
  }
  return isset($cache[$key]) ? $cache[$key] : NULL;
}

/**
 * Store an object in the non-volatile Views cache.
 *
 * @param $obj
 *   A 32 character or less string to define what kind of object is being
 *   stored; primarily this is used to prevent collisions.
 * @param $name
 *   The name of the view (or other object) being stored.
 * @param $cache
 *   The object to be cached. This will be serialized prior to writing.
 */
function views_object_cache_set($obj, $name, $cache) {
  views_object_cache_clear($obj, $name);
  db_query("INSERT INTO {views_object_cache} (sid, obj, name, data, updated) VALUES ('%s', '%s', '%s', '%s', %d)", session_id(), $obj, $name, serialize($cache), time());
}

/**
 * Remove an object from the non-volatile Views cache
 *
 * @param $obj
 *   A 32 character or less string to define what kind of object is being
 *   stored; primarily this is used to prevent collisions.
 * @param $name
 *   The name of the view (or other object) being stored.
 */
function views_object_cache_clear($obj, $name) {
  db_query("DELETE FROM {views_object_cache} WHERE sid = '%s' AND obj = '%s' AND name = '%s'", session_id(), $obj, $name);
}

/**
 * Remove all objects in the object cache that are older than the
 * specified age.
 *
 * @param $age
 *   The minimum age of objects to remove, in seconds. For example, 86400 is
 *   one day. Defaults to 7 days.
 */
function views_object_cache_clean($age = NULL) {
  if (empty($age)) {
    $age = 86400 * 7;

    // 7 days
  }
  db_query("DELETE FROM {views_object_cache} WHERE updated < %d", time() - $age);
}

/**
 * @}
 */

Functions

Name	Description
views_cache_get	Return data from the persistent views cache.
views_cache_set	Set a cached item in the views cache.
views_object_cache_clean	Remove all objects in the object cache that are older than the specified age.
views_object_cache_clear	Remove an object from the non-volatile Views cache
views_object_cache_get	Get an object from the non-volatile Views cache.
views_object_cache_set	Store an object in the non-volatile Views cache.
_views_discover_default_views	Scan all modules for default views and rebuild the default views cache.
_views_fetch_data	Fetch Views' data from the cache
_views_fetch_plugin_data	Fetch the plugin data from cache.
_views_include_default_views	Load default views files on behalf of modules.
_views_include_handlers	Load views files on behalf of modules.