PHP subscriptions::fill_subscription_cache方法代碼示例

 /**
  * Test that the subscription cache can be pre-filled.
  */
 public function test_subscription_cache_prefill()
 {
     global $DB;
     $this->resetAfterTest(true);
     // Create a course, with a forum.
     $course = $this->getDataGenerator()->create_course();
     $options = array('course' => $course->id, 'forcesubscribe' => FORUM_INITIALSUBSCRIBE);
     $forum = $this->getDataGenerator()->create_module('forum', $options);
     // Create some users.
     $users = $this->helper_create_users($course, 20);
     // Reset the subscription cache.
     \mod_forum\subscriptions::reset_forum_cache();
     // Filling the subscription cache should only use a single query.
     $startcount = $DB->perf_get_reads();
     $this->assertNull(\mod_forum\subscriptions::fill_subscription_cache($forum->id));
     $postfillcount = $DB->perf_get_reads();
     $this->assertEquals(1, $postfillcount - $startcount);
     // Now fetch some subscriptions from that forum - these should use
     // the cache and not perform additional queries.
     foreach ($users as $user) {
         $this->assertTrue(\mod_forum\subscriptions::fetch_subscription_cache($forum->id, $user->id));
     }
     $finalcount = $DB->perf_get_reads();
     $this->assertEquals(0, $finalcount - $postfillcount);
 }

/**
 * Function to be run periodically according to the scheduled task.
 *
 * Finds all posts that have yet to be mailed out, and mails them
 * out to all subscribers as well as other maintance tasks.
 *
 * NOTE: Since 2.7.2 this function is run by scheduled task rather
 * than standard cron.
 *
 * @todo MDL-44734 The function will be split up into seperate tasks.
 */
function forum_cron()
{
    global $CFG, $USER, $DB;
    $site = get_site();
    // All users that are subscribed to any post that needs sending,
    // please increase $CFG->extramemorylimit on large sites that
    // send notifications to a large number of users.
    $users = array();
    $userscount = 0;
    // Cached user counter - count($users) in PHP is horribly slow!!!
    // Status arrays.
    $mailcount = array();
    $errorcount = array();
    // caches
    $discussions = array();
    $forums = array();
    $courses = array();
    $coursemodules = array();
    $subscribedusers = array();
    // Posts older than 2 days will not be mailed.  This is to avoid the problem where
    // cron has not been running for a long time, and then suddenly people are flooded
    // with mail from the past few weeks or months
    $timenow = time();
    $endtime = $timenow - $CFG->maxeditingtime;
    $starttime = $endtime - 48 * 3600;
    // Two days earlier
    // Get the list of forum subscriptions for per-user per-forum maildigest settings.
    $digestsset = $DB->get_recordset('forum_digests', null, '', 'id, userid, forum, maildigest');
    $digests = array();
    foreach ($digestsset as $thisrow) {
        if (!isset($digests[$thisrow->forum])) {
            $digests[$thisrow->forum] = array();
        }
        $digests[$thisrow->forum][$thisrow->userid] = $thisrow->maildigest;
    }
    $digestsset->close();
    if ($posts = forum_get_unmailed_posts($starttime, $endtime, $timenow)) {
        // Mark them all now as being mailed.  It's unlikely but possible there
        // might be an error later so that a post is NOT actually mailed out,
        // but since mail isn't crucial, we can accept this risk.  Doing it now
        // prevents the risk of duplicated mails, which is a worse problem.
        if (!forum_mark_old_posts_as_mailed($endtime)) {
            mtrace('Errors occurred while trying to mark some posts as being mailed.');
            return false;
            // Don't continue trying to mail them, in case we are in a cron loop
        }
        // checking post validity, and adding users to loop through later
        foreach ($posts as $pid => $post) {
            $discussionid = $post->discussion;
            if (!isset($discussions[$discussionid])) {
                if ($discussion = $DB->get_record('forum_discussions', array('id' => $post->discussion))) {
                    $discussions[$discussionid] = $discussion;
                    \mod_forum\subscriptions::fill_subscription_cache($discussion->forum);
                    \mod_forum\subscriptions::fill_discussion_subscription_cache($discussion->forum);
                } else {
                    mtrace('Could not find discussion ' . $discussionid);
                    unset($posts[$pid]);
                    continue;
                }
            }
            $forumid = $discussions[$discussionid]->forum;
            if (!isset($forums[$forumid])) {
                if ($forum = $DB->get_record('forum', array('id' => $forumid))) {
                    $forums[$forumid] = $forum;
                } else {
                    mtrace('Could not find forum ' . $forumid);
                    unset($posts[$pid]);
                    continue;
                }
            }
            $courseid = $forums[$forumid]->course;
            if (!isset($courses[$courseid])) {
                if ($course = $DB->get_record('course', array('id' => $courseid))) {
                    $courses[$courseid] = $course;
                } else {
                    mtrace('Could not find course ' . $courseid);
                    unset($posts[$pid]);
                    continue;
                }
            }
            if (!isset($coursemodules[$forumid])) {
                if ($cm = get_coursemodule_from_instance('forum', $forumid, $courseid)) {
                    $coursemodules[$forumid] = $cm;
                } else {
                    mtrace('Could not find course module for forum ' . $forumid);
                    unset($posts[$pid]);
                    continue;
                }
            }
//.........這裏部分代碼省略.........

 if (!$cmto->uservisible) {
     print_error('cannotmovenotvisible', 'forum', $return);
 }
 $destinationctx = context_module::instance($cmto->id);
 require_capability('mod/forum:startdiscussion', $destinationctx);
 if (!forum_move_attachments($discussion, $forum->id, $forumto->id)) {
     echo $OUTPUT->notification("Errors occurred while moving attachment directories - check your file permissions");
 }
 // For each subscribed user in this forum and discussion, copy over per-discussion subscriptions if required.
 $discussiongroup = $discussion->groupid == -1 ? 0 : $discussion->groupid;
 $potentialsubscribers = \mod_forum\subscriptions::fetch_subscribed_users($forum, $discussiongroup, $modcontext, 'u.id', true);
 // Pre-seed the subscribed_discussion caches.
 // Firstly for the forum being moved to.
 \mod_forum\subscriptions::fill_subscription_cache($forumto->id);
 // And also for the discussion being moved.
 \mod_forum\subscriptions::fill_subscription_cache($forum->id);
 $subscriptionchanges = array();
 $subscriptiontime = time();
 foreach ($potentialsubscribers as $subuser) {
     $userid = $subuser->id;
     $targetsubscription = \mod_forum\subscriptions::is_subscribed($userid, $forumto, null, $cmto);
     $discussionsubscribed = \mod_forum\subscriptions::is_subscribed($userid, $forum, $discussion->id);
     $forumsubscribed = \mod_forum\subscriptions::is_subscribed($userid, $forum);
     if ($forumsubscribed && !$discussionsubscribed && $targetsubscription) {
         // The user has opted out of this discussion and the move would cause them to receive notifications again.
         // Ensure they are unsubscribed from the discussion still.
         $subscriptionchanges[$userid] = \mod_forum\subscriptions::FORUM_DISCUSSION_UNSUBSCRIBED;
     } else {
         if (!$forumsubscribed && $discussionsubscribed && !$targetsubscription) {
             // The user has opted into this discussion and would otherwise not receive the subscription after the move.
             // Ensure they are subscribed to the discussion still.