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<?php
/**
* Wrapper around a BagOStuff that caches data in memory
*
* 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
* @ingroup Cache
*/
/**
* Wrapper around a BagOStuff that caches data in memory
*
* The differences between CachedBagOStuff and MultiWriteBagOStuff are:
* * CachedBagOStuff supports only one "backend".
* * There's a flag for writes to only go to the in-memory cache.
* * The in-memory cache is always updated.
* * Locks go to the backend cache (with MultiWriteBagOStuff, it would wind
* up going to the HashBagOStuff used for the in-memory cache).
*
* @ingroup Cache
*/
class CachedBagOStuff extends HashBagOStuff {
/** @var BagOStuff */
protected $backend;
/**
* @param BagOStuff $backend Permanent backend to use
* @param array $params Parameters for HashBagOStuff
*/
function __construct( BagOStuff $backend, $params = [] ) {
unset( $params['reportDupes'] ); // useless here
parent::__construct( $params );
$this->backend = $backend;
$this->attrMap = $backend->attrMap;
}
protected function doGet( $key, $flags = 0 ) {
$ret = parent::doGet( $key, $flags );
if ( $ret === false && !$this->hasKey( $key ) ) {
$ret = $this->backend->doGet( $key, $flags );
$this->set( $key, $ret, 0, self::WRITE_CACHE_ONLY );
}
return $ret;
}
public function set( $key, $value, $exptime = 0, $flags = 0 ) {
parent::set( $key, $value, $exptime, $flags );
if ( !( $flags & self::WRITE_CACHE_ONLY ) ) {
$this->backend->set( $key, $value, $exptime, $flags & ~self::WRITE_CACHE_ONLY );
}
return true;
}
public function delete( $key, $flags = 0 ) {
unset( $this->bag[$key] );
if ( !( $flags & self::WRITE_CACHE_ONLY ) ) {
$this->backend->delete( $key );
}
return true;
}
public function setDebug( $bool ) {
parent::setDebug( $bool );
$this->backend->setDebug( $bool );
}
public function deleteObjectsExpiringBefore( $date, $progressCallback = false ) {
parent::deleteObjectsExpiringBefore( $date, $progressCallback );
return $this->backend->deleteObjectsExpiringBefore( $date, $progressCallback );
}
public function makeKey( $class, $component = null ) {
return call_user_func_array( [ $this->backend, __FUNCTION__ ], func_get_args() );
}
public function makeGlobalKey( $class, $component = null ) {
return call_user_func_array( [ $this->backend, __FUNCTION__ ], func_get_args() );
}
// These just call the backend (tested elsewhere)
// @codeCoverageIgnoreStart
public function lock( $key, $timeout = 6, $expiry = 6, $rclass = '' ) {
return $this->backend->lock( $key, $timeout, $expiry, $rclass );
}
public function unlock( $key ) {
return $this->backend->unlock( $key );
}
public function getLastError() {
return $this->backend->getLastError();
}
public function clearLastError() {
return $this->backend->clearLastError();
}
public function modifySimpleRelayEvent( array $event ) {
return $this->backend->modifySimpleRelayEvent( $event );
}
// @codeCoverageIgnoreEnd
}
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