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<?php
/**
* Represents the site configuration of a wiki.
* Holds a list of sites (ie SiteList), with a caching layer.
*
* 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
*
* @since 1.25
*
* @file
* @ingroup Site
*
* @license GNU GPL v2+
* @author Jeroen De Dauw < jeroendedauw@gmail.com >
* @author Katie Filbert < aude.wiki@gmail.com >
*/
class CachingSiteStore implements SiteStore {
/**
* @var SiteList|null
*/
private $sites = null;
/**
* @var string|null
*/
private $cacheKey;
/**
* @var int
*/
private $cacheTimeout;
/**
* @var BagOStuff
*/
private $cache;
/**
* @var SiteStore
*/
private $siteStore;
/**
* @param SiteStore $siteStore
* @param BagOStuff $cache
* @param string|null $cacheKey
* @param int $cacheTimeout
*/
public function __construct(
SiteStore $siteStore,
BagOStuff $cache,
$cacheKey = null,
$cacheTimeout = 3600
) {
$this->siteStore = $siteStore;
$this->cache = $cache;
$this->cacheKey = $cacheKey;
$this->cacheTimeout = $cacheTimeout;
}
/**
* Constructs a cache key to use for caching the list of sites.
*
* This includes the concrete class name of the site list as well as a version identifier
* for the list's serialization, to avoid problems when unserializing site lists serialized
* by an older version, e.g. when reading from a cache.
*
* The cache key also includes information about where the sites were loaded from, e.g.
* the name of a database table.
*
* @see SiteList::getSerialVersionId
*
* @return string The cache key.
*/
private function getCacheKey() {
if ( $this->cacheKey === null ) {
$type = 'SiteList#' . SiteList::getSerialVersionId();
$this->cacheKey = wfMemcKey( "sites/$type" );
}
return $this->cacheKey;
}
/**
* @see SiteStore::getSites
*
* @since 1.25
*
* @return SiteList
*/
public function getSites() {
if ( $this->sites === null ) {
$this->sites = $this->cache->get( $this->getCacheKey() );
if ( !is_object( $this->sites ) ) {
$this->sites = $this->siteStore->getSites();
$this->cache->set( $this->getCacheKey(), $this->sites, $this->cacheTimeout );
}
}
return $this->sites;
}
/**
* @see SiteStore::getSite
*
* @since 1.25
*
* @param string $globalId
*
* @return Site|null
*/
public function getSite( $globalId ) {
$sites = $this->getSites();
return $sites->hasSite( $globalId ) ? $sites->getSite( $globalId ) : null;
}
/**
* @see SiteStore::saveSite
*
* @since 1.25
*
* @param Site $site
*
* @return bool Success indicator
*/
public function saveSite( Site $site ) {
return $this->saveSites( array( $site ) );
}
/**
* @see SiteStore::saveSites
*
* @since 1.25
*
* @param Site[] $sites
*
* @return bool Success indicator
*/
public function saveSites( array $sites ) {
if ( empty( $sites ) ) {
return true;
}
$success = $this->siteStore->saveSites( $sites );
// purge cache
$this->reset();
return $success;
}
/**
* Purges the internal and external cache of the site list, forcing the list.
* of sites to be reloaded.
*
* Only use this for testing, as APC is typically used and is per-server
*
* @since 1.25
*/
public function reset() {
// purge cache
$this->cache->delete( $this->getCacheKey() );
$this->sites = null;
}
/**
* Clears the list of sites stored.
*
* Only use this for testing, as APC is typically used and is per-server.
*
* @see SiteStore::clear()
*
* @return bool Success
*/
public function clear() {
$this->reset();
return $this->siteStore->clear();
}
}
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