bc79ce7fb7
All callers in Wikimedia gerrit repos have since been migrated to incrWithInit(), which is usually what is desired and is easier to implement in various backends. Newer memcached versions of the memcached protocol even support auto-initializing increments (including an initial TTL) via the 'ma' command. The incr()/decr() methods currently bloat the interface and subclasses (often with slow and buggy implementations). These methods are also hard to implement in a multi-DC store (either extremely slow or racey) even though callers might assume they handle high concurrency. Also, force each MediumSpecificBagOStuff subclass to implement incrWithInit() instead of having some rely on the base method In mcc.php, add incrWithInit() and simplify parameters, making it possible to test non-memcached backends. Change-Id: I53c9c2c839a1e71d5c104913fea0680c30d11108
77 lines
2.1 KiB
PHP
77 lines
2.1 KiB
PHP
<?php
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/**
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* Dummy object caching.
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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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* @ingroup Cache
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*/
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/**
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* A BagOStuff object with no objects in it. Used to provide a no-op object to calling code.
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*
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* @ingroup Cache
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*/
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class EmptyBagOStuff extends MediumSpecificBagOStuff {
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public function __construct( array $params = [] ) {
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parent::__construct( $params );
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$this->attrMap[self::ATTR_DURABILITY] = self::QOS_DURABILITY_NONE;
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}
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protected function doGet( $key, $flags = 0, &$casToken = null ) {
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$casToken = null;
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return false;
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}
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protected function doSet( $key, $value, $exptime = 0, $flags = 0 ) {
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return true;
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}
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protected function doDelete( $key, $flags = 0 ) {
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return true;
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}
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protected function doAdd( $key, $value, $exptime = 0, $flags = 0 ) {
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return true;
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}
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public function incr( $key, $value = 1, $flags = 0 ) {
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return false;
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}
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public function decr( $key, $value = 1, $flags = 0 ) {
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return false;
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}
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protected function doIncrWithInit( $key, $exptime, $step, $init, $flags ) {
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return $init; // faster
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}
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public function merge( $key, callable $callback, $exptime = 0, $attempts = 10, $flags = 0 ) {
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return true; // faster
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}
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public function makeKeyInternal( $keyspace, $components ) {
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return $this->genericKeyFromComponents( $keyspace, ...$components );
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}
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protected function convertGenericKey( $key ) {
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return $key; // short-circuit; already uses "generic" keys
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}
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}
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