Session based immediate storage. More...

Collaboration diagram for ilSessionIStorage:

Public Member Functions
	__construct (string $a_component_id, string $a_sess_id="")
	Constructor. More...

	set (string $a_key, string $a_val)
	Set a value. More...

	get (string $a_key)

Static Public Member Functions
static	destroySession ($a_session_id)
	Destroy session(s). More...

Private Member Functions
	initComponentCacheIfNotExists ()

Private Attributes
string	$session_id = ""

string	$component_id

Static Private Attributes
static array	$values = []

Detailed Description

Session based immediate storage.

This class stores session based user data in the database. The difference to ilSession is that data is written immediately when the set() function is called and that this data is written "per key".

Please note that the values are limited to TEXT(1000)!

This class is needed for cases, where ajax calls should write session based data.

Since more concurrent ajax calls can be initiated by a page request, these calls may run into race conditions, if ilSession is used, since it always reads all key/value pairs at the beginning of a request and writes all of them at the end. Similar issues can appear if a page initiates additional requests by (i)frames.

Author: Alex Killing alex..nosp@m.kill.nosp@m.ing@g.nosp@m.mx.d.nosp@m.e

Definition at line 41 of file class.ilSessionIStorage.php.

Constructor & Destructor Documentation

◆ __construct()

ilSessionIStorage::__construct	(	string	$a_component_id,
		string	$a_sess_id = `""`
	)

Constructor.

Parameters

string	$a_component_id	component id (e.g. "crs", "lm", ...)
string	$a_sess_id	session id

Definition at line 53 of file class.ilSessionIStorage.php.

    {
        $this->component_id = $a_component_id;
        if ($a_sess_id !== "") {
            $this->session_id = $a_sess_id;
        } else {
            $this->session_id = session_id();
        }
    }

Member Function Documentation

◆ destroySession()

static ilSessionIStorage::destroySession ( $a_session_id )

static

Destroy session(s).

This is called by ilSession->destroy

Parameters

$a_session_id string|array ids of sessions to be deleted

Definition at line 129 of file class.ilSessionIStorage.php.

                                                        : void
    {
        global $DIC;
 
        if (!is_array($a_session_id)) {
            $q = "DELETE FROM usr_sess_istorage WHERE session_id = " .
                $DIC->database()->quote($a_session_id, "text");
        } else {
            $q = "DELETE FROM usr_sess_istorage WHERE " .
                $DIC->database()->in("session_id", $a_session_id, false, "text");
        }
 
        $DIC->database()->manipulate($q);
    }

References $DIC.

Referenced by ilSession\_destroy().

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◆ get()

ilSessionIStorage::get ( string $a_key )

Parameters

string $a_key

Returns: string

Definition at line 99 of file class.ilSessionIStorage.php.

                                      : string
    {
        global $DIC;
 
        $ilDB = $DIC['ilDB'];
 
        if (isset(self::$values[$this->component_id][$a_key]) && is_array(self::$values[$this->component_id])) {
            return self::$values[$this->component_id][$a_key];
        }
 
        $set = $ilDB->query(
            "SELECT value FROM usr_sess_istorage " .
            " WHERE session_id = " . $ilDB->quote($this->session_id, "text") .
            " AND component_id = " . $ilDB->quote($this->component_id, "text") .
            " AND vkey = " . $ilDB->quote($a_key, "text")
        );
        $rec = $ilDB->fetchAssoc($set);
        $value = (string) ($rec['value'] ?? '');
 
        $this->initComponentCacheIfNotExists();
 
        self::$values[$this->component_id][$a_key] = $value;
 
        return $value;
    }

References $component_id, $DIC, $ilDB, and initComponentCacheIfNotExists().

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◆ initComponentCacheIfNotExists()

ilSessionIStorage::initComponentCacheIfNotExists ( )

private

Definition at line 63 of file class.ilSessionIStorage.php.

                                                    : void
    {
        if (!isset(self::$values[$this->component_id]) || !is_array(self::$values[$this->component_id])) {
            self::$values[$this->component_id] = [];
        }
    }

References $component_id.

Referenced by get(), and set().

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◆ set()

ilSessionIStorage::set	(	string	$a_key,
		string	$a_val
	)

Set a value.

Parameters

string $a_val value

Definition at line 75 of file class.ilSessionIStorage.php.

                                                     : void
    {
        global $DIC;
 
        $ilDB = $DIC['ilDB'];
 
        $this->initComponentCacheIfNotExists();
 
        self::$values[$this->component_id][$a_key] = $a_val;
        $ilDB->replace(
            "usr_sess_istorage",
            array(
                "session_id" => array("text", $this->session_id),
                "component_id" => array("text", $this->component_id),
                "vkey" => array("text", $a_key)
                ),
            array("value" => array("text", $a_val))
        );
    }