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<?php |
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/** |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License along |
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* with this program; if not, write to the Free Software Foundation, Inc., |
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
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* http://www.gnu.org/copyleft/gpl.html |
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* |
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* @file |
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*/ |
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use Cdb\Exception; |
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use Cdb\Reader; |
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use Cdb\Writer; |
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/** |
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* LCStore implementation which stores data as a collection of CDB files in the |
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* directory given by $wgCacheDirectory. If $wgCacheDirectory is not set, this |
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* will throw an exception. |
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* |
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* Profiling indicates that on Linux, this implementation outperforms MySQL if |
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* the directory is on a local filesystem and there is ample kernel cache |
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* space. The performance advantage is greater when the DBA extension is |
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* available than it is with the PHP port. |
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* |
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* See Cdb.php and https://cr.yp.to/cdb.html |
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*/ |
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class LCStoreCDB implements LCStore { |
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/** @var Reader[] */ |
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private $readers; |
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/** @var Writer */ |
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private $writer; |
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/** @var string Current language code */ |
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private $currentLang; |
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/** @var bool|string Cache directory. False if not set */ |
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private $directory; |
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View Code Duplication |
function __construct( $conf = [] ) { |
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global $wgCacheDirectory; |
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if ( isset( $conf['directory'] ) ) { |
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$this->directory = $conf['directory']; |
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} else { |
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$this->directory = $wgCacheDirectory; |
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} |
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} |
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public function get( $code, $key ) { |
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if ( !isset( $this->readers[$code] ) ) { |
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$fileName = $this->getFileName( $code ); |
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$this->readers[$code] = false; |
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if ( file_exists( $fileName ) ) { |
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try { |
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$this->readers[$code] = Reader::open( $fileName ); |
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} catch ( Exception $e ) { |
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wfDebug( __METHOD__ . ": unable to open cdb file for reading\n" ); |
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} |
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} |
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} |
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if ( !$this->readers[$code] ) { |
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return null; |
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} else { |
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$value = false; |
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try { |
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$value = $this->readers[$code]->get( $key ); |
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} catch ( Exception $e ) { |
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wfDebug( __METHOD__ . ": \Cdb\Exception caught, error message was " |
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. $e->getMessage() . "\n" ); |
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} |
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if ( $value === false ) { |
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return null; |
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} |
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return unserialize( $value ); |
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} |
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} |
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public function startWrite( $code ) { |
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if ( !file_exists( $this->directory ) ) { |
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if ( !wfMkdirParents( $this->directory, null, __METHOD__ ) ) { |
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throw new MWException( "Unable to create the localisation store " . |
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"directory \"{$this->directory}\"" ); |
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} |
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} |
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// Close reader to stop permission errors on write |
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if ( !empty( $this->readers[$code] ) ) { |
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$this->readers[$code]->close(); |
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} |
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try { |
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$this->writer = Writer::open( $this->getFileName( $code ) ); |
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} catch ( Exception $e ) { |
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throw new MWException( $e->getMessage() ); |
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} |
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$this->currentLang = $code; |
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} |
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public function finishWrite() { |
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// Close the writer |
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try { |
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$this->writer->close(); |
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} catch ( Exception $e ) { |
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throw new MWException( $e->getMessage() ); |
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} |
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$this->writer = null; |
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unset( $this->readers[$this->currentLang] ); |
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$this->currentLang = null; |
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} |
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public function set( $key, $value ) { |
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if ( is_null( $this->writer ) ) { |
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throw new MWException( __CLASS__ . ': must call startWrite() before calling set()' ); |
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} |
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try { |
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$this->writer->set( $key, serialize( $value ) ); |
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} catch ( Exception $e ) { |
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throw new MWException( $e->getMessage() ); |
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} |
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} |
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protected function getFileName( $code ) { |
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if ( strval( $code ) === '' || strpos( $code, '/' ) !== false ) { |
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throw new MWException( __METHOD__ . ": Invalid language \"$code\"" ); |
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} |
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return "{$this->directory}/l10n_cache-$code.cdb"; |
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} |
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} |
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wikimedia /
mediawiki
Loading history...
Let’s assume that you have a directory layout like this:
. |-- OtherDir | |-- Bar.php | `-- Foo.php `-- SomeDir `-- Foo.phpand let’s assume the following content of
Bar.php:If both files
OtherDir/Foo.phpandSomeDir/Foo.phpare loaded in the same runtime, you will see a PHP error such as the following:PHP Fatal error: Cannot use SomeDir\Foo as Foo because the name is already in use in OtherDir/Foo.phpHowever, as
OtherDir/Foo.phpdoes not necessarily have to be loaded and the error is only triggered if it is loaded beforeOtherDir/Bar.php, this problem might go unnoticed for a while. In order to prevent this error from surfacing, you must import the namespace with a different alias: