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SalvageableService.php
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SalvageableService.php
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<?php
/**
* Interface for salvageable services.
*
* 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
*/
namespace Wikimedia\Services;
/**
* SalvageableService defines an interface for services that are able to salvage state from a
* previous instance of the same class. The intent is to allow new service instances to re-use
* resources that would be expensive to re-create, such as cached data or network connections.
*
* @note There is no expectation that services will be destroyed when the process (or web request)
* terminates.
*/
interface SalvageableService {
/**
* Re-uses state from $other. $other must not be used after being passed to salvage(),
* and should be considered to be destroyed.
*
* @note Implementations are responsible for determining what parts of $other can be re-used
* safely. In particular, implementations should check that the relevant configuration of
* $other is the same as in $this before re-using resources from $other.
*
* @note Implementations must take care to detach any re-used resources from the original
* service instance. If $other is destroyed later, resources that are now used by the
* new service instance must not be affected.
*
* @note If $other is a DestructibleService, implementations should make sure that $other
* is in destroyed state after salvage finished. This may be done by calling $other->destroy()
* after carefully detaching all relevant resources.
*
* @param SalvageableService $other The object to salvage state from. $other must have the
* exact same type as $this.
*/
public function salvage( SalvageableService $other );
}

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