ilObjectDataCache Class Reference

class ilObjectDataCache More...

Collaboration diagram for ilObjectDataCache:

Public Member Functions
	ilObjectDataCache ()
	deleteCachedEntry ($a_obj_id)
	lookupObjId ($a_ref_id)
	lookupTitle ($a_obj_id)
	lookupType ($a_obj_id)
	lookupOwner ($a_obj_id)
	lookupDescription ($a_obj_id)
	lookupLastUpdate ($a_obj_id)
	__isReferenceCached ($a_ref_id)
	checks whether an reference id is already in cache or not
	__isObjectCached ($a_obj_id)
	checks whether an object is aleady in cache or not
	__storeReference ($a_ref_id)
	Stores Reference in cache.
	__storeObjectData ($a_obj_id, $a_lang="")
	Stores object data in cache.
	preloadObjectCache ($a_obj_ids, $a_lang="")
	Stores object data in cache.
	preloadTranslations ($a_obj_ids, $a_lang)
	Preload translation informations.
	preloadReferenceCache ($a_ref_ids, $a_incl_obj=true)

Data Fields
	$db = null
	$reference_cache = array()
	$object_data_cache = array()

Detailed Description

class ilObjectDataCache

Author

Stefan Meyer meyer.nosp@m.@lei.nosp@m.fos.c.nosp@m.om

Version

Id:

class.ilObjectDataCache.php 25440 2010-08-27 20:00:46Z akill

This class caches some properties of the object_data table. Like title description owner obj_id

Definition at line 13 of file class.ilObjectDataCache.php.

Member Function Documentation

ilObjectDataCache::__isObjectCached

(

$a_obj_id

)

checks whether an object is aleady in cache or not

private

Parameters

int

$a_obj_id

object id

Returns

boolean

Definition at line 119 of file class.ilObjectDataCache.php.

Referenced by lookupDescription(), lookupLastUpdate(), lookupOwner(), lookupTitle(), and lookupType().

        {
                static $cached = 0;
                static $not_cached = 0;
                        

                if(@$this->object_data_cache[$a_obj_id])
                {
                        #echo "Object ". ++$cached ."cached<br>";
                        return true;
                }
                #echo "Object ". ++$not_cached ." not cached<br>";
                return false;
        }

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ilObjectDataCache::__isReferenceCached

(

$a_ref_id

)

checks whether an reference id is already in cache or not

private

Parameters

int

$a_ref_id

reference id

Returns

boolean

Definition at line 96 of file class.ilObjectDataCache.php.

Referenced by lookupObjId().

        {
                #return false;
                #static $cached = 0;
                #static $not_cached = 0;

                if(@$this->reference_cache[$a_ref_id])
                {
                        #echo "Reference ". ++$cached ."cached<br>";
                        return true;
                }
                #echo "Reference ". ++$not_cached ." not cached<br>";
                return false;
                
        }

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ilObjectDataCache::__storeObjectData	(		$a_obj_id,
			$a_lang = ""
	)

Stores object data in cache.

private

Parameters

int

$a_obj_id

object id

Returns

bool

Definition at line 164 of file class.ilObjectDataCache.php.

References $ilDB, $query, $res, $row, and DB_FETCHMODE_OBJECT.

Referenced by lookupDescription(), lookupLastUpdate(), lookupObjId(), lookupOwner(), lookupTitle(), and lookupType().

        {
                global $ilDB, $objDefinition, $ilUser;
                
                if (is_object($ilUser) && $a_lang == "")
                {
                        $a_lang = $ilUser->getLanguage();
                }

                $query = "SELECT * FROM object_data WHERE obj_id = ".
                        $ilDB->quote($a_obj_id ,'integer');
                $res = $this->db->query($query);
                while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
                {
                        $this->object_data_cache[$a_obj_id]['title'] = $row->title;
                        $this->object_data_cache[$a_obj_id]['description'] = $row->description;
                        $this->object_data_cache[$a_obj_id]['type'] = $row->type;
                        $this->object_data_cache[$a_obj_id]['owner'] = $row->owner;
                        $this->object_data_cache[$a_obj_id]['last_update'] = $row->last_update;
                        
                        if (is_object($objDefinition))
                        {
                                $translation_type = $objDefinition->getTranslationType($row->type);
                        }

                        if ($translation_type == "db")
                        {
                                if (!$this->trans_loaded[$a_obj_id])
                                {
                                        $q = "SELECT title,description FROM object_translation ".
                                                 "WHERE obj_id = ".$ilDB->quote($a_obj_id,'integer')." ".
                                                 "AND lang_code = ".$ilDB->quote($a_lang,'text')." ".
                                                 "AND NOT lang_default = 1";
                                        $r = $ilDB->query($q);

                                        $row = $r->fetchRow(DB_FETCHMODE_OBJECT);
                                        if ($row)
                                        {
                                                $this->object_data_cache[$a_obj_id]['title'] = $row->title;
                                                $this->object_data_cache[$a_obj_id]['description'] = $row->description;
                                        }
                                        $this->trans_loaded[$a_obj_id] = true;
                                }
                        }
                }
                
                return true;
        }

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ilObjectDataCache::__storeReference

(

$a_ref_id

)

Stores Reference in cache.

Maybe it could be useful to find all references of that object andd store them also in the cache. But this would be an extra query.

private

Parameters

int

$a_ref_id

reference id

Returns

int $obj_id

Definition at line 144 of file class.ilObjectDataCache.php.

References $ilDB, $query, $res, $row, and DB_FETCHMODE_ASSOC.

Referenced by lookupObjId().

        {
                global $ilDB;
                
                $query = "SELECT obj_id FROM object_reference WHERE ref_id = ".$ilDB->quote($a_ref_id,'integer');
                $res = $this->db->query($query);
                while($row = $res->fetchRow(DB_FETCHMODE_ASSOC))
                {
                        $this->reference_cache[$a_ref_id] = $row['obj_id'];
                }
                return (int) @$this->reference_cache[$a_ref_id];
        }

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ilObjectDataCache::deleteCachedEntry

(

$a_obj_id

)

Definition at line 26 of file class.ilObjectDataCache.php.

        {
                unset($this->object_data_cache[$a_obj_id]);
        }

ilObjectDataCache::ilObjectDataCache

(

)

Definition at line 19 of file class.ilObjectDataCache.php.

References $ilDB.

        {
                global $ilDB;

                $this->db =& $ilDB;
        }

ilObjectDataCache::lookupDescription

(

$a_obj_id

)

Definition at line 70 of file class.ilObjectDataCache.php.

References __isObjectCached(), and __storeObjectData().

        {
                if(!$this->__isObjectCached($a_obj_id))
                {
                        $this->__storeObjectData($a_obj_id);
                }
                return @$this->object_data_cache[$a_obj_id]['description'];
        }

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ilObjectDataCache::lookupLastUpdate

(

$a_obj_id

)

Definition at line 79 of file class.ilObjectDataCache.php.

References __isObjectCached(), and __storeObjectData().

        {
                if(!$this->__isObjectCached($a_obj_id))
                {
                        $this->__storeObjectData($a_obj_id);
                }
                return @$this->object_data_cache[$a_obj_id]['last_update'];
        }

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ilObjectDataCache::lookupObjId

(

$a_ref_id

)

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

References __isReferenceCached(), __storeObjectData(), and __storeReference().

        {
                if(!$this->__isReferenceCached($a_ref_id))
                {
//echo"-objidmissed-$a_ref_id-";
                        $obj_id = $this->__storeReference($a_ref_id);
                        $this->__storeObjectData($obj_id);
                }
                return (int) @$this->reference_cache[$a_ref_id];
        }

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ilObjectDataCache::lookupOwner

(

$a_obj_id

)

Definition at line 61 of file class.ilObjectDataCache.php.

References __isObjectCached(), and __storeObjectData().

        {
                if(!$this->__isObjectCached($a_obj_id))
                {
                        $this->__storeObjectData($a_obj_id);
                }
                return @$this->object_data_cache[$a_obj_id]['owner'];
        }

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ilObjectDataCache::lookupTitle

(

$a_obj_id

)

Definition at line 42 of file class.ilObjectDataCache.php.

References __isObjectCached(), and __storeObjectData().

        {
                if(!$this->__isObjectCached($a_obj_id))
                {
                        $this->__storeObjectData($a_obj_id);
                }
                return @$this->object_data_cache[$a_obj_id]['title'];
        }

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ilObjectDataCache::lookupType

(

$a_obj_id

)

Definition at line 51 of file class.ilObjectDataCache.php.

References __isObjectCached(), and __storeObjectData().

        {
                if(!$this->__isObjectCached($a_obj_id))
                {
//echo"-typemissed-$a_obj_id-";
                        $this->__storeObjectData($a_obj_id);
                }
                return @$this->object_data_cache[$a_obj_id]['type'];
        }

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ilObjectDataCache::preloadObjectCache	(		$a_obj_ids,
			$a_lang = ""
	)

Stores object data in cache.

private

Parameters

int

$a_obj_id

object id

Returns

bool

Definition at line 220 of file class.ilObjectDataCache.php.

References $ilDB, $query, $res, $row, DB_FETCHMODE_OBJECT, and preloadTranslations().

Referenced by preloadReferenceCache().

        {
                global $ilDB, $objDefinition, $ilUser, $tree;
                
                if (is_object($ilUser) && $a_lang == "")
                {
                        $a_lang = $ilUser->getLanguage();
                }
//echo "<br>-preloading-"; var_dump($a_obj_ids);
                if (!is_array($a_obj_ids)) return;
                if (count($a_obj_ids) == 0) return;
                
                
                $query = "SELECT * FROM object_data ".
                        "WHERE ".$ilDB->in('obj_id',$a_obj_ids,false,'integer');
                $res = $ilDB->query($query);
                $db_trans = array();
                while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
                {
//echo "<br>store_obj-".$row->obj_id."-".$row->type."-".$row->title."-";
                        $this->object_data_cache[$row->obj_id]['title'] = $row->title;
                        $this->object_data_cache[$row->obj_id]['description'] = $row->description;
                        $this->object_data_cache[$row->obj_id]['type'] = $row->type;
                        $this->object_data_cache[$row->obj_id]['owner'] = $row->owner;
                        $this->object_data_cache[$row->obj_id]['last_update'] = $row->last_update;

                        if (is_object($objDefinition))
                        {
                                $translation_type = $objDefinition->getTranslationType($row->type);
                        }

                        if ($translation_type == "db")
                        {
                                $db_trans[$row->obj_id] = $row->obj_id;
                        }
                }
                if (count($db_trans) > 0)
                {
                        $this->preloadTranslations($db_trans, $a_lang);
                }
        }

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ilObjectDataCache::preloadReferenceCache	(		$a_ref_ids,
			$a_incl_obj = true
	)

Definition at line 296 of file class.ilObjectDataCache.php.

References $ilDB, $query, $res, $row, DB_FETCHMODE_ASSOC, and preloadObjectCache().

        {
                global $ilDB;
                
                if (!is_array($a_ref_ids)) return;
                if (count($a_ref_ids) == 0) return;
                
                $query = "SELECT ref_id, obj_id FROM object_reference ".
                        "WHERE ".$ilDB->in('ref_id',$a_ref_ids,false,'integer');
                $res = $ilDB->query($query);
                
                $obj_ids = array();
                while($row = $res->fetchRow(DB_FETCHMODE_ASSOC))
                {
                        $this->reference_cache[$row['ref_id']] = $row['obj_id'];
//echo "<br>store_ref-".$row['ref_id']."-".$row['obj_id']."-";
                        $obj_ids[] = $row['obj_id'];
                }
                if ($a_incl_obj)
                {
                        $this->preloadObjectCache($obj_ids);
                }
        }

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ilObjectDataCache::preloadTranslations	(		$a_obj_ids,
			$a_lang
	)

Preload translation informations.

Parameters

array

$a_obj_ids

array of object ids

Definition at line 267 of file class.ilObjectDataCache.php.

References $ilDB, and DB_FETCHMODE_OBJECT.

Referenced by preloadObjectCache().

        {
                global $ilDB, $tree;

                $obj_ids = array();
                foreach ($a_obj_ids as $id)
                {
                        // do not load an id more than one time
                        if (!$this->trans_loaded[$id])
                        {
                                $obj_ids[] = $id;
                                $this->trans_loaded[$id] = true;
                        }
                }
                if (count($obj_ids) > 0)
                {
                        $q = "SELECT obj_id, title, description FROM object_translation ".
                                 "WHERE ".$ilDB->in('obj_id', $obj_ids, false, 'integer')." ".
                                 "AND lang_code = ".$ilDB->quote($a_lang, 'text')." ".
                                 "AND NOT lang_default = 1";
                        $r = $ilDB->query($q);
                        while ($row2 = $r->fetchRow(DB_FETCHMODE_OBJECT))
                        {
                                $this->object_data_cache[$row2->obj_id]['title'] = $row2->title;
                                $this->object_data_cache[$row2->obj_id]['description'] = $row2->description;
                        }
                }
        }

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Field Documentation

ilObjectDataCache::$db = null

Definition at line 15 of file class.ilObjectDataCache.php.

ilObjectDataCache::$object_data_cache = array()

Definition at line 17 of file class.ilObjectDataCache.php.

ilObjectDataCache::$reference_cache = array()

Definition at line 16 of file class.ilObjectDataCache.php.

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The documentation for this class was generated from the following file:

• classes/class.ilObjectDataCache.php