summaryrefslogtreecommitdiff
path: root/includes/objectcache/BagOStuff.php
diff options
context:
space:
mode:
Diffstat (limited to 'includes/objectcache/BagOStuff.php')
-rw-r--r--includes/objectcache/BagOStuff.php164
1 files changed, 164 insertions, 0 deletions
diff --git a/includes/objectcache/BagOStuff.php b/includes/objectcache/BagOStuff.php
new file mode 100644
index 00000000..97b6cb2c
--- /dev/null
+++ b/includes/objectcache/BagOStuff.php
@@ -0,0 +1,164 @@
+<?php
+/**
+ * Classes to cache objects in PHP accelerators, SQL database or DBA files
+ *
+ * Copyright © 2003-2004 Brion Vibber <brion@pobox.com>
+ * http://www.mediawiki.org/
+ *
+ * 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
+ */
+
+/**
+ * @defgroup Cache Cache
+ */
+
+/**
+ * interface is intended to be more or less compatible with
+ * the PHP memcached client.
+ *
+ * backends for local hash array and SQL table included:
+ * <code>
+ * $bag = new HashBagOStuff();
+ * $bag = new SqlBagOStuff(); # connect to db first
+ * </code>
+ *
+ * @ingroup Cache
+ */
+abstract class BagOStuff {
+ private $debugMode = false;
+
+ /**
+ * @param $bool bool
+ */
+ public function setDebug( $bool ) {
+ $this->debugMode = $bool;
+ }
+
+ /* *** THE GUTS OF THE OPERATION *** */
+ /* Override these with functional things in subclasses */
+
+ /**
+ * Get an item with the given key. Returns false if it does not exist.
+ * @param $key string
+ *
+ * @return bool|Object
+ */
+ abstract public function get( $key );
+
+ /**
+ * Set an item.
+ * @param $key string
+ * @param $value mixed
+ * @param $exptime int Either an interval in seconds or a unix timestamp for expiry
+ */
+ abstract public function set( $key, $value, $exptime = 0 );
+
+ /**
+ * Delete an item.
+ * @param $key string
+ * @param $time int Amount of time to delay the operation (mostly memcached-specific)
+ */
+ abstract public function delete( $key, $time = 0 );
+
+ public function lock( $key, $timeout = 0 ) {
+ /* stub */
+ return true;
+ }
+
+ public function unlock( $key ) {
+ /* stub */
+ return true;
+ }
+
+ public function keys() {
+ /* stub */
+ return array();
+ }
+
+ /**
+ * Delete all objects expiring before a certain date.
+ *
+ * @return true on success, false if unimplemented
+ */
+ public function deleteObjectsExpiringBefore( $date ) {
+ // stub
+ return false;
+ }
+
+ /* *** Emulated functions *** */
+
+ public function add( $key, $value, $exptime = 0 ) {
+ if ( !$this->get( $key ) ) {
+ $this->set( $key, $value, $exptime );
+
+ return true;
+ }
+ }
+
+ public function replace( $key, $value, $exptime = 0 ) {
+ if ( $this->get( $key ) !== false ) {
+ $this->set( $key, $value, $exptime );
+ }
+ }
+
+ /**
+ * @param $key String: Key to increase
+ * @param $value Integer: Value to add to $key (Default 1)
+ * @return null if lock is not possible else $key value increased by $value
+ */
+ public function incr( $key, $value = 1 ) {
+ if ( !$this->lock( $key ) ) {
+ return null;
+ }
+
+ $value = intval( $value );
+
+ if ( ( $n = $this->get( $key ) ) !== false ) {
+ $n += $value;
+ $this->set( $key, $n ); // exptime?
+ }
+ $this->unlock( $key );
+
+ return $n;
+ }
+
+ public function decr( $key, $value = 1 ) {
+ return $this->incr( $key, - $value );
+ }
+
+ public function debug( $text ) {
+ if ( $this->debugMode ) {
+ $class = get_class( $this );
+ wfDebug( "$class debug: $text\n" );
+ }
+ }
+
+ /**
+ * Convert an optionally relative time to an absolute time
+ */
+ protected function convertExpiry( $exptime ) {
+ if ( ( $exptime != 0 ) && ( $exptime < 86400 * 3650 /* 10 years */ ) ) {
+ return time() + $exptime;
+ } else {
+ return $exptime;
+ }
+ }
+}
+
+