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<?php
/**
* 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
*/
/**
* Self-releasing locks.
*
* Helper for consumers of LockManager, to create locks that automatically
* release when an object is destroyed or goes out of scope.
*
* @ingroup LockManager
* @since 1.19
*/
class ScopedLock {
/** @var LockManager */
protected $manager;
/** @var StatusValue */
protected $status;
/** @var array Map of lock types to resource paths */
protected $pathsByType;
/**
* @param LockManager $manager
* @param array $pathsByType Map of lock types to path lists
* @param StatusValue $status
*/
protected function __construct(
LockManager $manager, array $pathsByType, StatusValue $status
) {
$this->manager = $manager;
$this->pathsByType = $pathsByType;
$this->status = $status;
}
/**
* Get a ScopedLock object representing a lock on resource paths.
* Any locks are released once this object goes out of scope.
* The StatusValue object is updated with any errors or warnings.
*
* @param LockManager $manager
* @param array $paths List of storage paths or map of lock types to path lists
* @param int|string $type LockManager::LOCK_* constant or "mixed" and $paths
* can be a map of types to paths (since 1.22). Otherwise $type should be an
* integer and $paths should be a list of paths.
* @param StatusValue $status
* @param int $timeout Timeout in seconds (0 means non-blocking) (since 1.22)
* @return ScopedLock|null Returns null on failure
*/
public static function factory(
LockManager $manager, array $paths, $type, StatusValue $status, $timeout = 0
) {
$pathsByType = is_int( $type ) ? [ $type => $paths ] : $paths;
$lockStatus = $manager->lockByType( $pathsByType, $timeout );
$status->merge( $lockStatus );
if ( $lockStatus->isOK() ) {
return new self( $manager, $pathsByType, $status );
}
return null;
}
/**
* Release a scoped lock and set any errors in the attached StatusValue object.
* This is useful for early release of locks before function scope is destroyed.
* This is the same as setting the lock object to null.
*
* @param ScopedLock|null &$lock
* @since 1.21
*/
public static function release( ?ScopedLock &$lock = null ) {
$lock = null;
}
/**
* Release the locks when this goes out of scope
*/
public function __destruct() {
$wasOk = $this->status->isOK();
$this->status->merge( $this->manager->unlockByType( $this->pathsByType ) );
if ( $wasOk ) {
// Make sure StatusValue is OK, despite any unlockFiles() fatals
$this->status->setResult( true, $this->status->value );
}
}
}
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