Collaboration diagram for ilSessionStatistics:

Static Public Member Functions
static	isActive ()
	Is session statistics active at all? More...

static	createRawEntry (string $a_session_id, int $a_session_type, int $a_timestamp, int $a_user_id)
	Create raw data entry. More...

static	closeRawEntry ($a_session_id, ?int $a_context=null, $a_expired_at=null)
	Close raw data entry. More...

static	aggretateRaw (int $a_now)
	Aggregate raw session data (older than given time) More...

static	aggregateRawHelper (int $a_begin, int $a_end)
	Aggregate statistics data for one slot. More...

static	getLastMaxedOut ()
	Get latest slot during which sessions were maxed out. More...

static	getMaxedOutDuration (int $a_from, int $a_to)
	Get maxed out duration in given timeframe. More...

static	getNumberOfSessionsByType (int $a_from, int $a_to)
	Get session counters by type (opened, closed) More...

static	getLastAggregation ()
	Get timestamp of last aggregation. More...

static	getLimitForSlot (int $a_timestamp)
	Get max session setting for given timestamp. More...

static	updateLimitLog (int $a_new_value)
	Log max session setting. More...

Static Protected Member Functions
static	getCurrentSlot (int $a_now)
	Get next slot to aggregate. More...

static	getNumberOfActiveRawSessions (int $a_time)
	Count number of active sessions at given time. More...

static	getRawData (int $a_begin, int $a_end)
	Read raw data for timespan. More...

static	createNewAggregationSlot (int $a_now)
	Create new slot (using table lock) More...

static	deleteAggregatedRaw ($a_now)
	Remove already aggregated raw data. More...

Private Attributes
const	SLOT_SIZE = 15

Detailed Description

Author: Jörg Lützenkirchen luetz.nosp@m.enki.nosp@m.rchen.nosp@m.@lei.nosp@m.fos.c.nosp@m.om

Definition at line 24 of file class.ilSessionStatistics.php.

Member Function Documentation

◆ aggregateRawHelper()

static ilSessionStatistics::aggregateRawHelper	(	int	$a_begin,
		int	$a_end
	)

static

Aggregate statistics data for one slot.

Definition at line 275 of file class.ilSessionStatistics.php.

                                                                       : void
    {
        global $DIC;
 
        $ilDB = $DIC['ilDB'];
        $ilSetting = $DIC['ilSetting'];
 
        // "relevant" closing types
        $separate_closed = array(ilSession::SESSION_CLOSE_USER,
            ilSession::SESSION_CLOSE_EXPIRE,
            ilSession::SESSION_CLOSE_IDLE,
            ilSession::SESSION_CLOSE_FIRST,
            ilSession::SESSION_CLOSE_LIMIT,
            ilSession::SESSION_CLOSE_LOGIN);
 
        // gather/process data (build event timeline)
        $closed_counter = $events = array();
        $opened_counter = 0;
        foreach (self::getRawData($a_begin, $a_end) as $item) {
            // open/close counters are _not_ time related
 
            // we could filter for undefined/invalid closing contexts
            // and ignore those items, but this would make any debugging
            // close to impossible
            // "closed_other" would have been a good idea...
 
            // session opened
            if ($item["start_time"] >= $a_begin) {
                $opened_counter++;
                $events[$item["start_time"]][] = 1;
            }
            // session closed
            if ($item["end_time"] && $item["end_time"] <= $a_end) {
                if (in_array($item["end_context"], $separate_closed, true)) {
                    if (!isset($closed_counter[$item["end_context"]])) {
                        $closed_counter[$item["end_context"]] = 0;
                    }
 
                    $closed_counter[$item["end_context"]]++;
                } else {
                    $closed_counter[0] = ($closed_counter[0] ?? 0) + 1;
                }
                $events[$item["end_time"]][] = -1;
            }
        }
 
        // initialising active statistical values
        $active_begin = self::getNumberOfActiveRawSessions($a_begin - 1);
        $active_end = $active_min = $active_max = $active_avg = $active_begin;
 
        // parsing events / building avergages
        if (count($events)) {
            $last_update_avg = $a_begin - 1;
            $slot_seconds = self::SLOT_SIZE * 60;
            $active_avg = 0;
 
            // parse all open/closing events
            ksort($events);
            foreach ($events as $ts => $actions) {
                // actions which occur in the same second are "merged"
                foreach ($actions as $action) {
                    // max
                    if ($action > 0) {
                        $active_end++;
                    }
                    // min
                    else {
                        $active_end--;
                    }
                }
 
                // max
                if ($active_end > $active_max) {
                    $active_max = $active_end;
                }
 
                // min
                if ($active_end < $active_min) {
                    $active_min = $active_end;
                }
 
                // avg
                $diff = $ts - $last_update_avg;
                $active_avg += $diff / $slot_seconds * $active_end;
                $last_update_avg = $ts;
            }
 
            // add up to end of slot if needed
            if ($last_update_avg < $a_end) {
                $diff = $a_end - $last_update_avg;
                $active_avg += $diff / $slot_seconds * $active_end;
            }
 
            $active_avg = round($active_avg);
        }
        unset($events);
 
 
        // do we (really) need a log here?
        // $max_sessions = (int)$ilSetting->get("session_max_count", ilSessionControl::DEFAULT_MAX_COUNT);
        $max_sessions = self::getLimitForSlot($a_begin);
 
        // save aggregated data
        $fields = array(
            "active_min" => array("integer", $active_min),
            "active_max" => array("integer", $active_max),
            "active_avg" => array("integer", $active_avg),
            "active_end" => array("integer", $active_end),
            "opened" => array("integer", $opened_counter),
            "closed_manual" => array("integer", (int) ($closed_counter[ilSession::SESSION_CLOSE_USER] ?? 0)),
            "closed_expire" => array("integer", (int) ($closed_counter[ilSession::SESSION_CLOSE_EXPIRE] ?? 0)),
            "closed_idle" => array("integer", (int) ($closed_counter[ilSession::SESSION_CLOSE_IDLE] ?? 0)),
            "closed_idle_first" => array("integer", (int) ($closed_counter[ilSession::SESSION_CLOSE_FIRST] ?? 0)),
            "closed_limit" => array("integer", (int) ($closed_counter[ilSession::SESSION_CLOSE_LIMIT] ?? 0)),
            "closed_login" => array("integer", (int) ($closed_counter[ilSession::SESSION_CLOSE_LOGIN] ?? 0)),
            "closed_misc" => array("integer", (int) ($closed_counter[0] ?? 0)),
            "max_sessions" => array("integer", $max_sessions)
        );
        $ilDB->update(
            "usr_session_stats",
            $fields,
            array("slot_begin" => array("integer", $a_begin),
                "slot_end" => array("integer", $a_end))
        );
    }

References $DIC, $ilDB, $ilSetting, getLimitForSlot(), getNumberOfActiveRawSessions(), ilSession\SESSION_CLOSE_EXPIRE, ilSession\SESSION_CLOSE_FIRST, ilSession\SESSION_CLOSE_IDLE, ilSession\SESSION_CLOSE_LIMIT, ilSession\SESSION_CLOSE_LOGIN, and ilSession\SESSION_CLOSE_USER.

Referenced by aggretateRaw().

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◆ aggretateRaw()

static ilSessionStatistics::aggretateRaw ( int $a_now )

static

Aggregate raw session data (older than given time)

Parameters

integer $a_now

Definition at line 255 of file class.ilSessionStatistics.php.

                                                   : void
    {
        if (!self::isActive()) {
            return;
        }
 
        $slot = self::createNewAggregationSlot($a_now);
        while (is_array($slot)) {
            self::aggregateRawHelper($slot[0], $slot[1]);
            $slot = self::createNewAggregationSlot($a_now);
        }
 
        // #12728
        self::deleteAggregatedRaw($a_now);
    }

References aggregateRawHelper(), createNewAggregationSlot(), and deleteAggregatedRaw().

Referenced by ilSessionStatisticsGUI\adminSync().

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◆ closeRawEntry()

static ilSessionStatistics::closeRawEntry	(		$a_session_id,
		?int	$a_context = `null`,
			$a_expired_at = `null`
	)

static

Close raw data entry.

Parameters

int \| array	$a_session_id
int	$a_context
int \| bool	$a_expired_at

Definition at line 76 of file class.ilSessionStatistics.php.

                                                                                                     : void
    {
        global $DIC;
 
        $ilDB = $DIC['ilDB'];
 
        if (!self::isActive()) {
            return;
        }
 
        // single entry
        if (!is_array($a_session_id)) {
            if ($a_expired_at) {
                $end_time = $a_expired_at;
            } else {
                $end_time = time();
            }
            $sql = "UPDATE usr_session_stats_raw" .
                " SET end_time = " . $ilDB->quote($end_time, "integer");
            if ($a_context) {
                $sql .= ",end_context = " . $ilDB->quote($a_context, "integer");
            }
            $sql .= " WHERE session_id = " . $ilDB->quote($a_session_id, "text") .
                " AND end_time IS NULL";
            $ilDB->manipulate($sql);
        }
        // batch closing
        elseif (!$a_expired_at) {
            $sql = "UPDATE usr_session_stats_raw" .
                " SET end_time = " . $ilDB->quote(time(), "integer");
            if ($a_context) {
                $sql .= ",end_context = " . $ilDB->quote($a_context, "integer");
            }
            $sql .= " WHERE " . $ilDB->in("session_id", $a_session_id, false, "text") .
                " AND end_time IS NULL";
            $ilDB->manipulate($sql);
        }
        // batch with individual timestamps
        else {
            foreach ($a_session_id as $id => $ts) {
                $sql = "UPDATE usr_session_stats_raw" .
                    " SET end_time = " . $ilDB->quote($ts, "integer");
                if ($a_context) {
                    $sql .= ",end_context = " . $ilDB->quote($a_context, "integer");
                }
                $sql .= " WHERE session_id = " . $ilDB->quote($id, "text") .
                    " AND end_time IS NULL";
                $ilDB->manipulate($sql);
            }
        }
    }

References $DIC, $id, and $ilDB.

Referenced by ilSession\_destroy().

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◆ createNewAggregationSlot()

static ilSessionStatistics::createNewAggregationSlot ( int $a_now )

staticprotected

Create new slot (using table lock)

Returns: array begin, end

Definition at line 219 of file class.ilSessionStatistics.php.

                                                                  : ?array
    {
        global $DIC;
 
        $ilDB = $DIC['ilDB'];
 
        $ilAtomQuery = $ilDB->buildAtomQuery();
        $ilAtomQuery->addTableLock("usr_session_stats");
 
        $ilAtomQuery->addQueryCallable(function (ilDBInterface $ilDB) use ($a_now, &$slot) {
 
            // if we had to wait for the lock, no current slot should be returned here
            $slot = self::getCurrentSlot($a_now);
            if (!is_array($slot)) {
                $slot = null;
                return;
            }
 
            // save slot to mark as taken
            $fields = array(
                "slot_begin" => array("integer", $slot[0]),
                "slot_end" => array("integer", $slot[1]),
            );
            $ilDB->insert("usr_session_stats", $fields);
        });
 
        $ilAtomQuery->run();
 
        return $slot;
    }

References $DIC, $ilDB, and getCurrentSlot().

Referenced by aggretateRaw().

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◆ createRawEntry()

static ilSessionStatistics::createRawEntry	(	string	$a_session_id,
		int	$a_session_type,
		int	$a_timestamp,
		int	$a_user_id
	)

static

Create raw data entry.

Definition at line 43 of file class.ilSessionStatistics.php.

                                                                                                                      : void
    {
        global $DIC;
 
        $ilDB = $DIC['ilDB'];
 
        if (!$a_user_id || !$a_session_id || !self::isActive()) {
            return;
        }
 
        // #9669: if a session was destroyed and somehow the session id is still
        // in use there will be a id-collision for the raw-entry
 
        $ilDB->replace(
            "usr_session_stats_raw",
            array(
                "session_id" => array("text", $a_session_id)
            ),
            array(
                "type" => array("integer", $a_session_type),
                "start_time" => array("integer", $a_timestamp),
                "user_id" => array("integer", $a_user_id)
            )
        );
    }

References $DIC, and $ilDB.

Referenced by ilSessionControl\checkCurrentSessionIsAllowed().

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◆ deleteAggregatedRaw()

static ilSessionStatistics::deleteAggregatedRaw ( $a_now )

staticprotected

Remove already aggregated raw data.

Parameters

integer $a_now

Definition at line 406 of file class.ilSessionStatistics.php.

                                                         : void
    {
        global $DIC;
 
        $ilDB = $DIC['ilDB'];
 
        // we are rather defensive here - 7 days BEFORE current aggregation
        $cut = $a_now - (60 * 60 * 24 * 7);
 
        $ilDB->manipulate("DELETE FROM usr_session_stats_raw" .
            " WHERE start_time <= " . $ilDB->quote($cut, "integer"));
    }

References $DIC, and $ilDB.

Referenced by aggretateRaw().

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◆ getCurrentSlot()

static ilSessionStatistics::getCurrentSlot ( int $a_now )

staticprotected

Get next slot to aggregate.

Returns: array begin, end

Definition at line 133 of file class.ilSessionStatistics.php.

                                                        : ?array
    {
        global $DIC;
 
        $ilDB = $DIC['ilDB'];
 
        // get latest slot in db
        $sql = "SELECT MAX(slot_end) previous_slot_end" .
            " FROM usr_session_stats";
        $res = $ilDB->query($sql);
        $row = $ilDB->fetchAssoc($res);
        $previous_slot_end = $row["previous_slot_end"];
 
        // no previous slot?  calculate last complete slot
        // should we use minimum session raw date instead? (problem: table lock)
        if (!$previous_slot_end) {
            $slot = (int) (floor(date("i") / self::SLOT_SIZE));
            // last slot of previous hour
            if (!$slot) {
                $current_slot_begin = mktime((int) date("H", $a_now) - 1, 60 - self::SLOT_SIZE, 0);
            }
            // "normalize" to slot
            else {
                $current_slot_begin = mktime((int) date("H", $a_now), ($slot - 1) * self::SLOT_SIZE, 0);
            }
        } else {
            $current_slot_begin = $previous_slot_end + 1;
        }
 
        $current_slot_end = $current_slot_begin + (60 * self::SLOT_SIZE) - 1;
 
        // no complete slot: nothing to do yet
        if ($current_slot_end < $a_now) {
            return array($current_slot_begin, $current_slot_end);
        }
        return null;
    }

References $DIC, $ilDB, $res, ILIAS\Repository\int(), and SLOT_SIZE.

Referenced by createNewAggregationSlot().

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◆ getLastAggregation()

static ilSessionStatistics::getLastAggregation ( )

static

Get timestamp of last aggregation.

Definition at line 515 of file class.ilSessionStatistics.php.

                                               : ?int
    {
        global $DIC;
 
        $ilDB = $DIC['ilDB'];
 
        $sql = "SELECT max(slot_end) latest FROM usr_session_stats";
        $res = $ilDB->query($sql);
        $row = $ilDB->fetchAssoc($res);
        if ($row["latest"]) {
            return (int) $row["latest"];
        }
        //TODO check if return null as timestamp causes issues
        return null;
    }

References $DIC, $ilDB, and $res.

Referenced by ilSessionStatisticsGUI\renderCurrentBasics().

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◆ getLastMaxedOut()

static ilSessionStatistics::getLastMaxedOut ( )

static

Get latest slot during which sessions were maxed out.

Definition at line 422 of file class.ilSessionStatistics.php.

                                            : int
    {
        global $DIC;
 
        $ilDB = $DIC['ilDB'];
 
        $sql = "SELECT max(slot_end) latest FROM usr_session_stats" .
            " WHERE active_max >= max_sessions" .
            " AND max_sessions > " . $ilDB->quote(0, "integer");
        $res = $ilDB->query($sql);
        $row = $ilDB->fetchAssoc($res);
        if ($row["latest"]) {
            return (int) $row["latest"];
        }
        return 0;
    }

References $DIC, $ilDB, and $res.

Referenced by ilSessionStatisticsGUI\renderCurrentBasics().

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◆ getLimitForSlot()

static ilSessionStatistics::getLimitForSlot ( int $a_timestamp )

static

Get max session setting for given timestamp.

Definition at line 535 of file class.ilSessionStatistics.php.

                                                            : int
    {
        global $DIC;
 
        $ilDB = $DIC['ilDB'];
        $ilSetting = $DIC['ilSetting'];
 
        $ilDB->setLimit(1);
        $sql = "SELECT maxval FROM usr_session_log" .
            " WHERE tstamp <= " . $ilDB->quote($a_timestamp, "integer") .
            " ORDER BY tstamp DESC";
        $res = $ilDB->query($sql);
        $val = $ilDB->fetchAssoc($res);
        if (isset($val["maxval"]) && $val["maxval"]) {
            return (int) $val["maxval"];
        }
 
        return (int) $ilSetting->get("session_max_count", (string) ilSessionControl::DEFAULT_MAX_COUNT);
    }

References $DIC, $ilDB, $ilSetting, $res, and ilSessionControl\DEFAULT_MAX_COUNT.

Referenced by aggregateRawHelper().

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◆ getMaxedOutDuration()

static ilSessionStatistics::getMaxedOutDuration	(	int	$a_from,
		int	$a_to
	)

static

Get maxed out duration in given timeframe.

Returns: ?int seconds

Definition at line 444 of file class.ilSessionStatistics.php.

                                                                      : ?int
    {
        global $DIC;
 
        $ilDB = $DIC['ilDB'];
 
        $sql = "SELECT SUM(slot_end-slot_begin) dur FROM usr_session_stats" .
            " WHERE active_max >= max_sessions" .
            " AND max_sessions > " . $ilDB->quote(0, "integer") .
            " AND slot_end > " . $ilDB->quote($a_from, "integer") .
            " AND slot_begin < " . $ilDB->quote($a_to, "integer");
        $res = $ilDB->query($sql);
        $row = $ilDB->fetchAssoc($res);
        if ($row["dur"]) {
            return (int) $row["dur"];
        }
        //TODO check if return null as timestamp causes issues
        return null;
    }

References $DIC, $ilDB, and $res.

Referenced by ilSessionStatisticsGUI\buildData().

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◆ getNumberOfActiveRawSessions()

static ilSessionStatistics::getNumberOfActiveRawSessions ( int $a_time )

staticprotected

Count number of active sessions at given time.

Parameters

integer $a_time

Returns: integer

Definition at line 177 of file class.ilSessionStatistics.php.

                                                                       : int
    {
        global $DIC;
 
        $ilDB = $DIC['ilDB'];
 
        $sql = "SELECT COUNT(*) counter FROM usr_session_stats_raw" .
            " WHERE (end_time IS NULL OR end_time >= " . $ilDB->quote($a_time, "integer") . ")" .
            " AND start_time <= " . $ilDB->quote($a_time, "integer") .
            " AND " . $ilDB->in("type", ilSessionControl::$session_types_controlled, false, "integer");
        $res = $ilDB->query($sql);
        $row = $ilDB->fetchAssoc($res);
        return (int) $row["counter"];
    }

References $DIC, $ilDB, $res, and ilSessionControl\$session_types_controlled.

Referenced by aggregateRawHelper().

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◆ getNumberOfSessionsByType()

static ilSessionStatistics::getNumberOfSessionsByType	(	int	$a_from,
		int	$a_to
	)

static

Get session counters by type (opened, closed)

Definition at line 467 of file class.ilSessionStatistics.php.

                                                                            : array
    {
        global $DIC;
 
        $ilDB = $DIC['ilDB'];
 
        $sql = "SELECT SUM(opened) opened, SUM(closed_manual) closed_manual," .
            " SUM(closed_expire) closed_expire, SUM(closed_idle) closed_idle," .
            " SUM(closed_idle_first) closed_idle_first, SUM(closed_limit) closed_limit," .
            " SUM(closed_login) closed_login, SUM(closed_misc) closed_misc" .
            " FROM usr_session_stats" .
            " WHERE slot_end > " . $ilDB->quote($a_from, "integer") .
            " AND slot_begin < " . $ilDB->quote($a_to, "integer");
        $res = $ilDB->query($sql);
        return $ilDB->fetchAssoc($res);
    }

References $DIC, $ilDB, and $res.

Referenced by ilSessionStatisticsGUI\buildData().

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◆ getRawData()

static ilSessionStatistics::getRawData	(	int	$a_begin,
		int	$a_end
	)

staticprotected

Read raw data for timespan.

Definition at line 195 of file class.ilSessionStatistics.php.

                                                                  : array
    {
        global $DIC;
 
        $ilDB = $DIC['ilDB'];
 
        $sql = "SELECT start_time,end_time,end_context FROM usr_session_stats_raw" .
            " WHERE start_time <= " . $ilDB->quote($a_end, "integer") .
            " AND (end_time IS NULL OR end_time >= " . $ilDB->quote($a_begin, "integer") . ")" .
            " AND " . $ilDB->in("type", ilSessionControl::$session_types_controlled, false, "integer") .
            " ORDER BY start_time";
        $res = $ilDB->query($sql);
        $all = array();
        while ($row = $ilDB->fetchAssoc($res)) {
            $all[] = $row;
        }
        return $all;
    }

References $DIC, $ilDB, $res, and ilSessionControl\$session_types_controlled.

◆ isActive()

static ilSessionStatistics::isActive ( )

static

Is session statistics active at all?

Definition at line 31 of file class.ilSessionStatistics.php.

                                     : bool
    {
        global $DIC;
 
        $ilSetting = $DIC['ilSetting'];
 
        return (bool) $ilSetting->get('session_statistics', "1");
    }

References $DIC, and $ilSetting.

◆ updateLimitLog()

static ilSessionStatistics::updateLimitLog ( int $a_new_value )

static

Log max session setting.

Definition at line 558 of file class.ilSessionStatistics.php.

                                                           : void
    {
        global $DIC;
 
        $ilDB = $DIC['ilDB'];
        $ilSetting = $DIC['ilSetting'];
        $ilUser = $DIC['ilUser'];
 
        $new_value = $a_new_value;
        $old_value = (int) $ilSetting->get("session_max_count", (string) ilSessionControl::DEFAULT_MAX_COUNT);
 
        if ($new_value !== $old_value) {
            $fields = array(
                "tstamp" => array("timestamp", time()),
                "maxval" => array("integer", $new_value),
                "user_id" => array("integer", $ilUser->getId())
            );
            $ilDB->insert("usr_session_log", $fields);
        }
    }