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MDL-37455 Performance improvement in mod_folder

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We cache and store additional data in cm_info::customdata and do not
query DB every time the folder is displayed on a course page
This commit is contained in:
Marina Glancy 2013-01-24 12:39:26 +11:00
parent 38199c247b
commit ec62d8b4e5
2 changed files with 60 additions and 12 deletions
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69
mod/folder/lib.php
View file

@ -412,6 +412,44 @@ function folder_dndupload_handle($uploadinfo) {
return false;
}
/**
* Given a coursemodule object, this function returns the extra
* information needed to print this activity in various places.
*
* If folder needs to be displayed inline we store additional information
* in customdata, so functions {@link folder_cm_info_dynamic()} and
* {@link folder_cm_info_view()} do not need to do DB queries
*
* @param cm_info $cm
* @return cached_cm_info info
*/
function folder_get_coursemodule_info($cm) {
global $DB;
if (!($folder = $DB->get_record('folder', array('id' => $cm->instance),
'id, name, display, intro, introformat'))) {
return NULL;
}
$cminfo = new cached_cm_info();
$cminfo->name = $folder->name;
if ($folder->display == FOLDER_DISPLAY_INLINE) {
// prepare folder object to store in customdata
$fdata = new stdClass;
if ($cm->showdescription && strlen(trim($folder->intro))) {
$fdata->intro = $folder->intro;
if ($folder->introformat != FORMAT_MOODLE) {
$fdata->introformat = $folder->introformat;
}
}
$cminfo->customdata = json_encode($fdata);
} else {
if ($cm->showdescription) {
// Convert intro to html. Do not filter cached version, filters run at display time.
$cminfo->content = format_module_intro('folder', $folder, $cm->id, false);
}
}
return $cminfo;
}
/**
* Sets dynamic information about a course module
*
@ -421,26 +459,35 @@ function folder_dndupload_handle($uploadinfo) {
* @param cm_info $cm
*/
function folder_cm_info_dynamic(cm_info $cm) {
global $DB;
$folder = $DB->get_record('folder', array('id' => $cm->instance), '*', MUST_EXIST);
if ($folder->display == FOLDER_DISPLAY_INLINE) {
if (strlen($cm->get_custom_data())) {
$cm->set_no_view_link();
}
}
/**
* Adds information about unread messages, that is only required for the course
* view page (and similar), to the course-module object.
* Overwrites the content in the course-module object with the folder files list
* if folder.display == FOLDER_DISPLAY_INLINE
*
* @param cm_info $cm
*/
function folder_cm_info_view(cm_info $cm) {
global $PAGE, $DB;
if ($cm->uservisible && has_capability('mod/folder:view', $cm->context)) {
$folder = $DB->get_record('folder', array('id' => $cm->instance), '*', MUST_EXIST);
if ($folder->display == FOLDER_DISPLAY_INLINE) {
$renderer = $PAGE->get_renderer('mod_folder');
$cm->set_content($renderer->display_folder($folder));
global $PAGE;
if ($cm->uservisible && strlen($cm->get_custom_data()) &&
has_capability('mod/folder:view', $cm->context)) {
// restore folder object from customdata
$folder = json_decode($cm->get_custom_data());
$folder->id = (int)$cm->instance;
$folder->course = (int)$cm->course;
$folder->display = FOLDER_DISPLAY_INLINE;
$folder->name = $cm->name;
if (empty($folder->intro)) {
$folder->intro = '';
}
if (empty($folder->introformat)) {
$folder->introformat = FORMAT_MOODLE;
}
// display folder
$renderer = $PAGE->get_renderer('mod_folder');
$cm->set_content($renderer->display_folder($folder));
}
}

3
mod/folder/renderer.php
View file

@ -31,7 +31,8 @@ class mod_folder_renderer extends plugin_renderer_base {
* Returns html to display the content of mod_folder
* (Description, folder files and optionally Edit button)
*
* @param stdClass $folder record from 'folder' table
* @param stdClass $folder record from 'folder' table (please note
* it may not contain fields 'revision' and 'timemodified')
* @return string
*/
public function display_folder(stdClass $folder) {