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<?php
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/**
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* @file
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* Definition of views_plugin_cache.
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*/
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/**
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* @defgroup views_cache_plugins Views cache plugins
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* @{
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* @todo.
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*
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* @see hook_views_plugins()
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*/
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/**
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* The base plugin to handle caching.
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*/
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class views_plugin_cache extends views_plugin {
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/**
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* Contains all data that should be written/read from cache.
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*/
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var $storage = array();
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/**
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* What table to store data in.
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*/
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var $table = 'cache_views_data';
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/**
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* Initialize the plugin.
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*
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* @param $view
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* The view object.
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* @param $display
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* The display handler.
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*/
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function init(&$view, &$display) {
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$this->view = &$view;
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$this->display = &$display;
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if (is_object($display->handler)) {
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$options = $display->handler->get_option('cache');
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// Overlay incoming options on top of defaults
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$this->unpack_options($this->options, $options);
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}
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}
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/**
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* Return a string to display as the clickable title for the
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* access control.
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*/
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function summary_title() {
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return t('Unknown');
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}
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/**
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* Determine the expiration time of the cache type, or NULL if no expire.
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*
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* Plugins must override this to implement expiration.
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*
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* @param $type
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* The cache type, either 'query', 'result' or 'output'.
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*/
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function cache_expire($type) { }
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/**
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* Determine expiration time in the cache table of the cache type
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* or CACHE_PERMANENT if item shouldn't be removed automatically from cache.
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*
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* Plugins must override this to implement expiration in the cache table.
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*
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* @param $type
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* The cache type, either 'query', 'result' or 'output'.
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*/
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function cache_set_expire($type) {
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return CACHE_PERMANENT;
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}
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/**
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* Save data to the cache.
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*
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* A plugin should override this to provide specialized caching behavior.
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*/
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function cache_set($type) {
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switch ($type) {
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case 'query':
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// Not supported currently, but this is certainly where we'd put it.
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break;
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case 'results':
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$data = array(
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'result' => $this->view->result,
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'total_rows' => isset($this->view->total_rows) ? $this->view->total_rows : 0,
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'current_page' => $this->view->get_current_page(),
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);
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cache_set($this->get_results_key(), $data, $this->table, $this->cache_set_expire($type));
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break;
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case 'output':
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$this->gather_headers();
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$this->storage['output'] = $this->view->display_handler->output;
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cache_set($this->get_output_key(), $this->storage, $this->table, $this->cache_set_expire($type));
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break;
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}
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}
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/**
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* Retrieve data from the cache.
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*
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* A plugin should override this to provide specialized caching behavior.
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*/
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function cache_get($type) {
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$cutoff = $this->cache_expire($type);
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switch ($type) {
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case 'query':
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// Not supported currently, but this is certainly where we'd put it.
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return FALSE;
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case 'results':
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// Values to set: $view->result, $view->total_rows, $view->execute_time,
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// $view->current_page.
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if ($cache = cache_get($this->get_results_key(), $this->table)) {
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if (!$cutoff || $cache->created > $cutoff) {
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$this->view->result = $cache->data['result'];
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$this->view->total_rows = $cache->data['total_rows'];
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$this->view->set_current_page($cache->data['current_page']);
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$this->view->execute_time = 0;
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return TRUE;
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}
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}
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return FALSE;
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case 'output':
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if ($cache = cache_get($this->get_output_key(), $this->table)) {
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if (!$cutoff || $cache->created > $cutoff) {
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$this->storage = $cache->data;
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$this->view->display_handler->output = $cache->data['output'];
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$this->restore_headers();
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return TRUE;
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}
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}
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return FALSE;
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}
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}
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/**
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* Clear out cached data for a view.
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*
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* We're just going to nuke anything related to the view, regardless of display,
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* to be sure that we catch everything. Maybe that's a bad idea.
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*/
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function cache_flush() {
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cache_clear_all($this->view->name . ':', $this->table, TRUE);
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}
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/**
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* Post process any rendered data.
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*
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* This can be valuable to be able to cache a view and still have some level of
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* dynamic output. In an ideal world, the actual output will include HTML
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* comment based tokens, and then the post process can replace those tokens.
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*
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* Example usage. If it is known that the view is a node view and that the
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* primary field will be a nid, you can do something like this:
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*
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* <!--post-FIELD-NID-->
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*
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* And then in the post render, create an array with the text that should
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* go there:
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*
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* strtr($output, array('<!--post-FIELD-1-->', 'output for FIELD of nid 1');
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*
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* All of the cached result data will be available in $view->result, as well,
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* so all ids used in the query should be discoverable.
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*/
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function post_render(&$output) { }
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/**
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* Start caching javascript, css and other out of band info.
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*
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* This takes a snapshot of the current system state so that we don't
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* duplicate it. Later on, when gather_headers() is run, this information
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* will be removed so that we don't hold onto it.
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*/
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function cache_start() {
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$this->storage['head'] = drupal_add_html_head();
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$this->storage['css'] = drupal_add_css();
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$this->storage['js'] = drupal_add_js();
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$this->storage['headers'] = drupal_get_http_header();
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}
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/**
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* Gather out of band data, compare it to what we started with and store the difference.
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*/
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function gather_headers() {
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// Simple replacement for head
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if (isset($this->storage['head'])) {
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$this->storage['head'] = str_replace($this->storage['head'], '', drupal_add_html_head());
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}
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else {
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$this->storage['head'] = '';
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}
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// Check if the advanced mapping function of D 7.23 is available.
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$array_mapping_func = function_exists('drupal_array_diff_assoc_recursive') ? 'drupal_array_diff_assoc_recursive' : 'array_diff_assoc';
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// Slightly less simple for CSS:
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$css = drupal_add_css();
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$css_start = isset($this->storage['css']) ? $this->storage['css'] : array();
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$this->storage['css'] = $this->assetDiff($css, $css_start, $array_mapping_func);
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// Get javascript after/before views renders.
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$js = drupal_add_js();
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$js_start = isset($this->storage['js']) ? $this->storage['js'] : array();
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// If there are any differences between the old and the new javascript then
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// store them to be added later.
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$this->storage['js'] = $this->assetDiff($js, $js_start, $array_mapping_func);
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// Special case the settings key and get the difference of the data.
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$settings = isset($js['settings']['data']) ? $js['settings']['data'] : array();
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$settings_start = isset($js_start['settings']['data']) ? $js_start['settings']['data'] : array();
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$this->storage['js']['settings'] = $array_mapping_func($settings, $settings_start);
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// Get difference of HTTP headers.
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$this->storage['headers'] = $array_mapping_func(drupal_get_http_header(), $this->storage['headers']);
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}
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/**
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* Computes the differences between two JS/CSS asset arrays.
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*
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* @param array $assets
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* The current asset array.
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* @param array $start_assets
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* The original asset array.
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* @param string $diff_function
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* The function that should be used for computing the diff.
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*
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* @return array
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* A CSS or JS asset array that contains all entries that are new/different
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* in $assets.
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*/
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protected function assetDiff(array $assets, array $start_assets, $diff_function) {
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$diff = $diff_function($assets, $start_assets);
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// Cleanup the resulting array since drupal_array_diff_assoc_recursive() can
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// leave half populated arrays behind.
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foreach ($diff as $key => $entry) {
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// If only the weight was different we can remove this entry.
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if (count($entry) == 1 && isset($entry['weight'])) {
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unset($diff[$key]);
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}
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// If there are other differences we override with the latest entry.
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elseif ($entry != $assets[$key]) {
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$diff[$key] = $assets[$key];
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}
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}
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return $diff;
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}
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/**
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* Restore out of band data saved to cache. Copied from Panels.
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*/
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function restore_headers() {
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if (!empty($this->storage['head'])) {
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drupal_add_html_head($this->storage['head']);
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}
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if (!empty($this->storage['css'])) {
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foreach ($this->storage['css'] as $args) {
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drupal_add_css($args['data'], $args);
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}
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}
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if (!empty($this->storage['js'])) {
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foreach ($this->storage['js'] as $key => $args) {
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if ($key !== 'settings') {
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drupal_add_js($args['data'], $args);
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}
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else {
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foreach ($args as $setting) {
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drupal_add_js($setting, 'setting');
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}
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}
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}
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}
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if (!empty($this->storage['headers'])) {
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foreach ($this->storage['headers'] as $name => $value) {
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drupal_add_http_header($name, $value);
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}
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}
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}
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function get_results_key() {
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if (!isset($this->_results_key)) {
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$this->_results_key = $this->view->name . ':' . $this->display->id . ':results:' . $this->get_cache_key();
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}
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return $this->_results_key;
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}
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function get_output_key() {
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if (!isset($this->_output_key)) {
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$key_data = array(
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'theme' => $GLOBALS['theme'],
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);
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$this->_output_key = $this->view->name . ':' . $this->display->id . ':output:' . $this->get_cache_key($key_data);
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}
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return $this->_output_key;
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}
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/**
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* Returns cache key.
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*
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* @param array $key_data
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* Additional data for cache segmentation and/or overrides for default
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* segmentation.
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*
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* @return string
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*/
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function get_cache_key($key_data = array()) {
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global $user;
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$key_data += array(
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'roles' => array_keys($user->roles),
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'super-user' => $user->uid == 1, // special caching for super user.
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'language' => $GLOBALS['language']->language,
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'base_url' => $GLOBALS['base_url'],
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);
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if (empty($key_data['build_info'])) {
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$build_info = $this->view->build_info;
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foreach (array('query','count_query') as $index) {
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// If the default query back-end is used generate SQL query strings from
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// the query objects.
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if ($build_info[$index] instanceof SelectQueryInterface) {
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$query = clone $build_info[$index];
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$query->preExecute();
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$key_data['build_info'][$index] = array(
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'sql' => (string) $query,
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'arguments' => $query->getArguments(),
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);
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}
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}
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}
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$key = md5(serialize($key_data));
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return $key;
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}
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}
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/**
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* @}
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*/
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