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MDL-46960 completionlib: Move completion cache to MUC.

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This commit is contained in:
Michael Wheeler
2015-03-31 09:31:30 +08:00
committed by Marina Glancy
parent 20d38830ae
commit 3871db0ac2
4 changed files with 57 additions and 130 deletions
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lib/completionlib.php
+19 -72
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@@ -119,12 +119,6 @@ define('COMPLETION_VIEWED', 1);
*/
define('COMPLETION_NOT_VIEWED', 0);
/**
* Cache expiry time in seconds (10 minutes)
* Completion cacheing
*/
define('COMPLETION_CACHE_EXPIRY', 10*60);
/**
* Completion details should be ORed together and you should return false if
* none apply.
@@ -553,7 +547,7 @@ class completion_info {
* @return void
*/
public function update_state($cm, $possibleresult=COMPLETION_UNKNOWN, $userid=0) {
global $USER, $SESSION;
global $USER;
// Do nothing if completion is not enabled for that activity
if (!$this->is_enabled($cm)) {
@@ -792,20 +786,13 @@ class completion_info {
* Used by course reset page.
*/
public function delete_all_completion_data() {
global $DB, $SESSION;
global $DB;
// Delete from database.
$DB->delete_records_select('course_modules_completion',
'coursemoduleid IN (SELECT id FROM {course_modules} WHERE course=?)',
array($this->course_id));
// Reset cache for current user.
if (isset($SESSION->completioncache) &&
array_key_exists($this->course_id, $SESSION->completioncache)) {
unset($SESSION->completioncache[$this->course_id]);
}
// Wipe course completion data too.
$this->delete_course_completion_data();
}
@@ -818,19 +805,11 @@ class completion_info {
* @param stdClass|cm_info $cm Activity
*/
public function delete_all_state($cm) {
global $SESSION, $DB;
global $DB;
// Delete from database
$DB->delete_records('course_modules_completion', array('coursemoduleid'=>$cm->id));
// Erase cache data for current user if applicable
if (isset($SESSION->completioncache) &&
array_key_exists($cm->course, $SESSION->completioncache) &&
array_key_exists($cm->id, $SESSION->completioncache[$cm->course])) {
unset($SESSION->completioncache[$cm->course][$cm->id]);
}
// Check if there is an associated course completion criteria
$criteria = $this->get_criteria(COMPLETION_CRITERIA_TYPE_ACTIVITY);
$acriteria = false;
@@ -876,7 +855,7 @@ class completion_info {
}
$rs->close();
// Delete all existing state [also clears session cache for current user]
// Delete all existing state.
$this->delete_all_state($cm);
// Merge this with list of planned users (according to roles)
@@ -894,7 +873,7 @@ class completion_info {
/**
* Obtains completion data for a particular activity and user (from the
* session cache if available, or by SQL query)
* completion cache if available, or by SQL query)
*
* @param stcClass|cm_info $cm Activity; only required field is ->id
* @param bool $wholecourse If true (default false) then, when necessary to
@@ -908,39 +887,21 @@ class completion_info {
* @return object Completion data (record from course_modules_completion)
*/
public function get_data($cm, $wholecourse = false, $userid = 0, $modinfo = null) {
global $USER, $CFG, $SESSION, $DB;
global $USER, $CFG, $DB;
$completioncache = cache::make('core', 'completion');
// Get user ID
if (!$userid) {
$userid = $USER->id;
}
// Is this the current user?
$currentuser = $userid==$USER->id;
if ($currentuser && is_object($SESSION)) {
// Make sure cache is present and is for current user (loginas
// changes this)
if (!isset($SESSION->completioncache) || $SESSION->completioncacheuserid!=$USER->id) {
$SESSION->completioncache = array();
$SESSION->completioncacheuserid = $USER->id;
}
// Expire any old data from cache
foreach ($SESSION->completioncache as $courseid=>$activities) {
if (empty($activities['updated']) || $activities['updated'] < time()-COMPLETION_CACHE_EXPIRY) {
unset($SESSION->completioncache[$courseid]);
}
}
// See if requested data is present, if so use cache to get it
if (isset($SESSION->completioncache) &&
array_key_exists($this->course->id, $SESSION->completioncache) &&
array_key_exists($cm->id, $SESSION->completioncache[$this->course->id])) {
return $SESSION->completioncache[$this->course->id][$cm->id];
}
// See if requested data is present in cache
if ($cacheddata = $completioncache->get($userid . '_' . $this->course->id . '_' . $cm->id)) {
return $cacheddata;
}
// Not there, get via SQL
if ($currentuser && $wholecourse) {
if ($wholecourse) {
// Get whole course data for cache
$alldatabycmc = $DB->get_records_sql("
SELECT
@@ -976,14 +937,13 @@ class completion_info {
$data->viewed = 0;
$data->timemodified = 0;
}
$SESSION->completioncache[$this->course->id][$othercm->id] = $data;
$completioncache->set($userid . '_' . $this->course->id . '_' . $othercm->id, $data);
}
$SESSION->completioncache[$this->course->id]['updated'] = time();
if (!isset($SESSION->completioncache[$this->course->id][$cm->id])) {
if (!$completiondata = $completioncache->get($userid . '_' . $this->course->id . '_' . $cm->id)) {
$this->internal_systemerror("Unexpected error: course-module {$cm->id} could not be found on course {$this->course->id}");
}
return $SESSION->completioncache[$this->course->id][$cm->id];
return $completiondata;
} else {
// Get single record
@@ -1000,13 +960,7 @@ class completion_info {
}
// Put in cache
if ($currentuser) {
$SESSION->completioncache[$this->course->id][$cm->id] = $data;
// For single updates, only set date if it was empty before
if (empty($SESSION->completioncache[$this->course->id]['updated'])) {
$SESSION->completioncache[$this->course->id]['updated'] = time();
}
}
$completioncache->set($userid . '_' . $this->course->id . '_' . $cm->id, $data);
}
return $data;
@@ -1022,7 +976,7 @@ class completion_info {
* @param stdClass $data Data about completion for that user
*/
public function internal_set_data($cm, $data) {
global $USER, $SESSION, $DB;
global $USER, $DB;
$transaction = $DB->start_delegated_transaction();
if (!$data->id) {
@@ -1054,8 +1008,10 @@ class completion_info {
$event->add_record_snapshot('course_modules_completion', $data);
$event->trigger();
$completioncache = cache::make('core', 'completion');
$completioncache->set($data->userid . '_' . $cm->course . '_' . $cm->id, $data);
// TODO under what circumstances should I call get_fast_modinfo()?
if ($data->userid == $USER->id) {
$SESSION->completioncache[$cm->course][$cm->id] = $data;
// reset modinfo for user (no need to call rebuild_course_cache())
get_fast_modinfo($cm->course, 0, true);
}
@@ -1341,13 +1297,4 @@ class completion_info {
throw new moodle_exception('err_system','completion',
$CFG->wwwroot.'/course/view.php?id='.$this->course->id,null,$error);
}
/**
* For testing only. Wipes information cached in user session.
*/
public static function wipe_session_cache() {
global $SESSION;
unset($SESSION->completioncache);
unset($SESSION->completioncacheuserid);
}
}