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<?php
/**
* Access to properties of a page.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
*/
/**
* Gives access to properties of a page.
*
* @since 1.27
*
*/
class PageProps {
/**
* @var PageProps
*/
private static $instance;
/**
* Overrides the default instance of this class
* This is intended for use while testing and will fail if MW_PHPUNIT_TEST is not defined.
*
* If this method is used it MUST also be called with null after a test to ensure a new
* default instance is created next time getInstance is called.
*
* @since 1.27
*
* @param PageProps|null $store
*
* @return ScopedCallback to reset the overridden value
* @throws MWException
*/
public static function overrideInstance( PageProps $store = null ) {
if ( !defined( 'MW_PHPUNIT_TEST' ) ) {
throw new MWException(
'Cannot override ' . __CLASS__ . 'default instance in operation.'
);
}
$previousValue = self::$instance;
self::$instance = $store;
return new ScopedCallback( function() use ( $previousValue ) {
self::$instance = $previousValue;
} );
}
/**
* @return PageProps
*/
public static function getInstance() {
if ( self::$instance === null ) {
self::$instance = new self();
}
return self::$instance;
}
/** Cache parameters */
const CACHE_TTL = 10; // integer; TTL in seconds
const CACHE_SIZE = 100; // integer; max cached pages
/** Property cache */
private $cache = null;
/**
* Create a PageProps object
*/
private function __construct() {
$this->cache = new ProcessCacheLRU( self::CACHE_SIZE );
}
/**
* Given one or more Titles and one or more names of properties,
* returns an associative array mapping page ID to property value.
* Pages in the provided set of Titles that do not have a value for
* the given properties will not appear in the returned array. If a
* single Title is provided, it does not need to be passed in an array,
* but an array will always be returned. If a single property name is
* provided, it does not need to be passed in an array. In that case,
* an associtive array mapping page ID to property value will be
* returned; otherwise, an associative array mapping page ID to
* an associative array mapping property name to property value will be
* returned. An empty array will be returned if no matching properties
* were found.
*
* @param Title[]|Title $titles
* @param string[]|string $propertyNames
* @return array associative array mapping page ID to property value
*/
public function getProperties( $titles, $propertyNames ) {
if ( is_array( $propertyNames ) ) {
$gotArray = true;
} else {
$propertyNames = [ $propertyNames ];
$gotArray = false;
}
$values = [];
$goodIDs = $this->getGoodIDs( $titles );
$queryIDs = [];
foreach ( $goodIDs as $pageID ) {
foreach ( $propertyNames as $propertyName ) {
$propertyValue = $this->getCachedProperty( $pageID, $propertyName );
if ( $propertyValue === false ) {
$queryIDs[] = $pageID;
break;
} else {
if ( $gotArray ) {
$values[$pageID][$propertyName] = $propertyValue;
} else {
$values[$pageID] = $propertyValue;
}
}
}
}
if ( $queryIDs ) {
$dbr = wfGetDB( DB_SLAVE );
$result = $dbr->select(
'page_props',
[
'pp_page',
'pp_propname',
'pp_value'
],
[
'pp_page' => $queryIDs,
'pp_propname' => $propertyNames
],
__METHOD__
);
foreach ( $result as $row ) {
$pageID = $row->pp_page;
$propertyName = $row->pp_propname;
$propertyValue = $row->pp_value;
$this->cacheProperty( $pageID, $propertyName, $propertyValue );
if ( $gotArray ) {
$values[$pageID][$propertyName] = $propertyValue;
} else {
$values[$pageID] = $propertyValue;
}
}
}
return $values;
}
/**
* Get all page property values.
* Given one or more Titles, returns an associative array mapping page
* ID to an associative array mapping property names to property
* values. Pages in the provided set of Titles that do not have any
* properties will not appear in the returned array. If a single Title
* is provided, it does not need to be passed in an array, but an array
* will always be returned. An empty array will be returned if no
* matching properties were found.
*
* @param Title[]|Title $titles
* @return array associative array mapping page ID to property value array
*/
public function getAllProperties( $titles ) {
$values = [];
$goodIDs = $this->getGoodIDs( $titles );
$queryIDs = [];
foreach ( $goodIDs as $pageID ) {
$pageProperties = $this->getCachedProperties( $pageID );
if ( $pageProperties === false ) {
$queryIDs[] = $pageID;
} else {
$values[$pageID] = $pageProperties;
}
}
if ( $queryIDs != [] ) {
$dbr = wfGetDB( DB_SLAVE );
$result = $dbr->select(
'page_props',
[
'pp_page',
'pp_propname',
'pp_value'
],
[
'pp_page' => $queryIDs,
],
__METHOD__
);
$currentPageID = 0;
$pageProperties = [];
foreach ( $result as $row ) {
$pageID = $row->pp_page;
if ( $currentPageID != $pageID ) {
if ( $pageProperties != [] ) {
$this->cacheProperties( $currentPageID, $pageProperties );
$values[$currentPageID] = $pageProperties;
}
$currentPageID = $pageID;
$pageProperties = [];
}
$pageProperties[$row->pp_propname] = $row->pp_value;
}
if ( $pageProperties != [] ) {
$this->cacheProperties( $pageID, $pageProperties );
$values[$pageID] = $pageProperties;
}
}
return $values;
}
/**
* @param Title[]|Title $titles
* @return array array of good page IDs
*/
private function getGoodIDs( $titles ) {
$result = [];
if ( is_array( $titles ) ) {
foreach ( $titles as $title ) {
$pageID = $title->getArticleID();
if ( $pageID > 0 ) {
$result[] = $pageID;
}
}
} else {
$pageID = $titles->getArticleID();
if ( $pageID > 0 ) {
$result[] = $pageID;
}
}
return $result;
}
/**
* Get a property from the cache.
*
* @param int $pageID page ID of page being queried
* @param string $propertyName name of property being queried
* @return string|bool property value array or false if not found
*/
private function getCachedProperty( $pageID, $propertyName ) {
if ( $this->cache->has( $pageID, $propertyName, self::CACHE_TTL ) ) {
return $this->cache->get( $pageID, $propertyName );
}
if ( $this->cache->has( 0, $pageID, self::CACHE_TTL ) ) {
$pageProperties = $this->cache->get( 0, $pageID );
if ( isset( $pageProperties[$propertyName] ) ) {
return $pageProperties[$propertyName];
}
}
return false;
}
/**
* Get properties from the cache.
*
* @param int $pageID page ID of page being queried
* @return string|bool property value array or false if not found
*/
private function getCachedProperties( $pageID ) {
if ( $this->cache->has( 0, $pageID, self::CACHE_TTL ) ) {
return $this->cache->get( 0, $pageID );
}
return false;
}
/**
* Save a property to the cache.
*
* @param int $pageID page ID of page being cached
* @param string $propertyName name of property being cached
* @param mixed $propertyValue value of property
*/
private function cacheProperty( $pageID, $propertyName, $propertyValue ) {
$this->cache->set( $pageID, $propertyName, $propertyValue );
}
/**
* Save properties to the cache.
*
* @param int $pageID page ID of page being cached
* @param string[] $pageProperties associative array of page properties to be cached
*/
private function cacheProperties( $pageID, $pageProperties ) {
$this->cache->clear( $pageID );
$this->cache->set( 0, $pageID, $pageProperties );
}
}