MDL-67468 filter_activitynames: use MUC
[moodle.git] / filter / activitynames / filter.php
index d9ce6f7..d6d3079 100644 (file)
@@ -31,83 +31,24 @@ defined('MOODLE_INTERNAL') || die();
  * Activity name filtering
  */
 class filter_activitynames extends moodle_text_filter {
-    // Trivial-cache - keyed on $cachedcourseid and $cacheduserid.
-    static $activitylist = null;
-    static $cachedcourseid;
-    static $cacheduserid;
 
     function filter($text, array $options = array()) {
-        global $USER; // Since 2.7 we can finally start using globals in filters.
-
         $coursectx = $this->context->get_course_context(false);
         if (!$coursectx) {
             return $text;
         }
         $courseid = $coursectx->instanceid;
 
-        // Initialise/invalidate our trivial cache if dealing with a different course.
-        if (!isset(self::$cachedcourseid) || self::$cachedcourseid !== (int)$courseid) {
-            self::$activitylist = null;
-        }
-        self::$cachedcourseid = (int)$courseid;
-        // And the same for user id.
-        if (!isset(self::$cacheduserid) || self::$cacheduserid !== (int)$USER->id) {
-            self::$activitylist = null;
-        }
-        self::$cacheduserid = (int)$USER->id;
-
-        /// It may be cached
-
-        if (is_null(self::$activitylist)) {
-            self::$activitylist = array();
-
-            $modinfo = get_fast_modinfo($courseid);
-            if (!empty($modinfo->cms)) {
-                self::$activitylist = array(); // We will store all the created filters here.
-
-                // Create array of visible activities sorted by the name length (we are only interested in properties name and url).
-                $sortedactivities = array();
-                foreach ($modinfo->cms as $cm) {
-                    // Use normal access control and visibility, but exclude labels and hidden activities.
-                    if ($cm->visible and $cm->has_view() and $cm->uservisible) {
-                        $sortedactivities[] = (object)array(
-                            'name' => $cm->name,
-                            'url' => $cm->url,
-                            'id' => $cm->id,
-                            'namelen' => -strlen($cm->name), // Negative value for reverse sorting.
-                        );
-                    }
-                }
-                // Sort activities by the length of the activity name in reverse order.
-                core_collator::asort_objects_by_property($sortedactivities, 'namelen', core_collator::SORT_NUMERIC);
-
-                foreach ($sortedactivities as $cm) {
-                    $title = s(trim(strip_tags($cm->name)));
-                    $currentname = trim($cm->name);
-                    $entitisedname  = s($currentname);
-                    // Avoid empty or unlinkable activity names.
-                    if (!empty($title)) {
-                        $href_tag_begin = html_writer::start_tag('a',
-                                array('class' => 'autolink', 'title' => $title,
-                                    'href' => $cm->url));
-                        self::$activitylist[$cm->id] = new filterobject($currentname, $href_tag_begin, '</a>', false, true);
-                        if ($currentname != $entitisedname) {
-                            // If name has some entity (&amp; &quot; &lt; &gt;) add that filter too. MDL-17545.
-                            self::$activitylist[$cm->id.'-e'] = new filterobject($entitisedname, $href_tag_begin, '</a>', false, true);
-                        }
-                    }
-                }
-            }
-        }
+        $activitylist = $this->get_cached_activity_list($courseid);
 
         $filterslist = array();
-        if (self::$activitylist) {
+        if (!empty($activitylist)) {
             $cmid = $this->context->instanceid;
-            if ($this->context->contextlevel == CONTEXT_MODULE && isset(self::$activitylist[$cmid])) {
+            if ($this->context->contextlevel == CONTEXT_MODULE && isset($activitylist[$cmid])) {
                 // remove filterobjects for the current module
-                $filterslist = array_values(array_diff_key(self::$activitylist, array($cmid => 1, $cmid.'-e' => 1)));
+                $filterslist = array_values(array_diff_key($activitylist, array($cmid => 1, $cmid.'-e' => 1)));
             } else {
-                $filterslist = array_values(self::$activitylist);
+                $filterslist = array_values($activitylist);
             }
         }
 
@@ -117,4 +58,76 @@ class filter_activitynames extends moodle_text_filter {
             return $text;
         }
     }
+
+    /**
+     * Get all the cached activity list for a course
+     *
+     * @param int $courseid id of the course
+     * @return filterobject[] the activities
+     */
+    protected function get_cached_activity_list($courseid) {
+        global $USER;
+        $cached = cache::make_from_params(cache_store::MODE_REQUEST, 'filter', 'activitynames');
+
+        // Return cached activity list.
+        if ($cached->get('cachecourseid') == $courseid && $cached->get('cacheuserid') == $USER->id) {
+            return $cached->get('activitylist');
+        }
+
+        // Not cached yet, get activity list and set cache.
+        $activitylist = $this->get_activity_list($courseid);
+        $cached->set('cacheuserid', $USER->id);
+        $cached->set('cachecourseid', $courseid);
+        $cached->set('activitylist', $activitylist);
+        return $activitylist;
+    }
+
+    /**
+     * Get all the activity list for a course
+     *
+     * @param int $courseid id of the course
+     * @return filterobject[] the activities
+     */
+    protected function get_activity_list($courseid) {
+        $activitylist = array();
+
+        $modinfo = get_fast_modinfo($courseid);
+        if (!empty($modinfo->cms)) {
+            $activitylist = array(); // We will store all the created filters here.
+
+            // Create array of visible activities sorted by the name length (we are only interested in properties name and url).
+            $sortedactivities = array();
+            foreach ($modinfo->cms as $cm) {
+                // Use normal access control and visibility, but exclude labels and hidden activities.
+                if ($cm->visible and $cm->has_view() and $cm->uservisible) {
+                    $sortedactivities[] = (object)array(
+                        'name' => $cm->name,
+                        'url' => $cm->url,
+                        'id' => $cm->id,
+                        'namelen' => -strlen($cm->name), // Negative value for reverse sorting.
+                    );
+                }
+            }
+            // Sort activities by the length of the activity name in reverse order.
+            core_collator::asort_objects_by_property($sortedactivities, 'namelen', core_collator::SORT_NUMERIC);
+
+            foreach ($sortedactivities as $cm) {
+                $title = s(trim(strip_tags($cm->name)));
+                $currentname = trim($cm->name);
+                $entitisedname  = s($currentname);
+                // Avoid empty or unlinkable activity names.
+                if (!empty($title)) {
+                    $hreftagbegin = html_writer::start_tag('a',
+                        array('class' => 'autolink', 'title' => $title,
+                            'href' => $cm->url));
+                    $activitylist[$cm->id] = new filterobject($currentname, $hreftagbegin, '</a>', false, true);
+                    if ($currentname != $entitisedname) {
+                        // If name has some entity (&amp; &quot; &lt; &gt;) add that filter too. MDL-17545.
+                        $activitylist[$cm->id.'-e'] = new filterobject($entitisedname, $hreftagbegin, '</a>', false, true);
+                    }
+                }
+            }
+        }
+        return $activitylist;
+    }
 }