6 files changed, 827 insertions, 0 deletions
diff --git a/includes/libs/objectcache/APCBagOStuff.php b/includes/libs/objectcache/APCBagOStuff.php
new file mode 100644
index 00000000..eaf11557
--- /dev/null
+++ b/includes/libs/objectcache/APCBagOStuff.php
@@ -0,0 +1,69 @@
+<?php
+/**
+ * Object caching using PHP's APC accelerator.
+ *
+ * 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
+ */
+
+/**
+ * This is a wrapper for APC's shared memory functions
+ *
+ * @ingroup Cache
+ */
+class APCBagOStuff extends BagOStuff {
+	public function get( $key, &$casToken = null ) {
+		$val = apc_fetch( $key );
+
+		$casToken = $val;
+
+		if ( is_string( $val ) ) {
+			if ( $this->isInteger( $val ) ) {
+				$val = intval( $val );
+			} else {
+				$val = unserialize( $val );
+			}
+		}
+
+		return $val;
+	}
+
+	public function set( $key, $value, $exptime = 0 ) {
+		if ( !$this->isInteger( $value ) ) {
+			$value = serialize( $value );
+		}
+
+		apc_store( $key, $value, $exptime );
+
+		return true;
+	}
+
+	public function delete( $key ) {
+		apc_delete( $key );
+
+		return true;
+	}
+
+	public function incr( $key, $value = 1 ) {
+		return apc_inc( $key, $value );
+	}
+
+	public function decr( $key, $value = 1 ) {
+		return apc_dec( $key, $value );
+	}
+}
diff --git a/includes/libs/objectcache/BagOStuff.php b/includes/libs/objectcache/BagOStuff.php
new file mode 100644
index 00000000..0b791e5a
--- /dev/null
+++ b/includes/libs/objectcache/BagOStuff.php
@@ -0,0 +1,438 @@
+<?php
+/**
+ * Classes to cache objects in PHP accelerators, SQL database or DBA files
+ *
+ * Copyright © 2003-2004 Brion Vibber <brion@pobox.com>
+ * https://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
+ */
+
+use Psr\Log\LoggerAwareInterface;
+use Psr\Log\LoggerInterface;
+use Psr\Log\NullLogger;
+
+/**
+ * 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 implements LoggerAwareInterface {
+	private $debugMode = false;
+
+	protected $lastError = self::ERR_NONE;
+
+	/**
+	 * @var LoggerInterface
+	 */
+	protected $logger;
+
+	/** Possible values for getLastError() */
+	const ERR_NONE = 0; // no error
+	const ERR_NO_RESPONSE = 1; // no response
+	const ERR_UNREACHABLE = 2; // can't connect
+	const ERR_UNEXPECTED = 3; // response gave some error
+
+	public function __construct( array $params = array() ) {
+		if ( isset( $params['logger'] ) ) {
+			$this->setLogger( $params['logger'] );
+		} else {
+			$this->setLogger( new NullLogger() );
+		}
+	}
+
+	/**
+	 * @param LoggerInterface $logger
+	 * @return null
+	 */
+	public function setLogger( LoggerInterface $logger ) {
+		$this->logger = $logger;
+	}
+
+	/**
+	 * @param bool $bool
+	 */
+	public function setDebug( $bool ) {
+		$this->debugMode = $bool;
+	}
+
+	/**
+	 * Get an item with the given key. Returns false if it does not exist.
+	 * @param string $key
+	 * @param mixed $casToken [optional]
+	 * @return mixed Returns false on failure
+	 */
+	abstract public function get( $key, &$casToken = null );
+
+	/**
+	 * Set an item.
+	 * @param string $key
+	 * @param mixed $value
+	 * @param int $exptime Either an interval in seconds or a unix timestamp for expiry
+	 * @return bool Success
+	 */
+	abstract public function set( $key, $value, $exptime = 0 );
+
+	/**
+	 * Delete an item.
+	 * @param string $key
+	 * @return bool True if the item was deleted or not found, false on failure
+	 */
+	abstract public function delete( $key );
+
+	/**
+	 * Merge changes into the existing cache value (possibly creating a new one).
+	 * The callback function returns the new value given the current value (possibly false),
+	 * and takes the arguments: (this BagOStuff object, cache key, current value).
+	 *
+	 * @param string $key
+	 * @param callable $callback Callback method to be executed
+	 * @param int $exptime Either an interval in seconds or a unix timestamp for expiry
+	 * @param int $attempts The amount of times to attempt a merge in case of failure
+	 * @return bool Success
+	 */
+	public function merge( $key, $callback, $exptime = 0, $attempts = 10 ) {
+		if ( !is_callable( $callback ) ) {
+			throw new Exception( "Got invalid callback." );
+		}
+
+		return $this->mergeViaLock( $key, $callback, $exptime, $attempts );
+	}
+
+	/**
+	 * @see BagOStuff::merge()
+	 *
+	 * @param string $key
+	 * @param callable $callback Callback method to be executed
+	 * @param int $exptime Either an interval in seconds or a unix timestamp for expiry
+	 * @param int $attempts The amount of times to attempt a merge in case of failure
+	 * @return bool Success
+	 */
+	protected function mergeViaCas( $key, $callback, $exptime = 0, $attempts = 10 ) {
+		do {
+			$casToken = null; // passed by reference
+			$currentValue = $this->get( $key, $casToken );
+			// Derive the new value from the old value
+			$value = call_user_func( $callback, $this, $key, $currentValue );
+
+			if ( $value === false ) {
+				$success = true; // do nothing
+			} elseif ( $currentValue === false ) {
+				// Try to create the key, failing if it gets created in the meantime
+				$success = $this->add( $key, $value, $exptime );
+			} else {
+				// Try to update the key, failing if it gets changed in the meantime
+				$success = $this->cas( $casToken, $key, $value, $exptime );
+			}
+		} while ( !$success && --$attempts );
+
+		return $success;
+	}
+
+	/**
+	 * Check and set an item
+	 *
+	 * @param mixed $casToken
+	 * @param string $key
+	 * @param mixed $value
+	 * @param int $exptime Either an interval in seconds or a unix timestamp for expiry
+	 * @return bool Success
+	 */
+	protected function cas( $casToken, $key, $value, $exptime = 0 ) {
+		throw new Exception( "CAS is not implemented in " . __CLASS__ );
+	}
+
+	/**
+	 * @see BagOStuff::merge()
+	 *
+	 * @param string $key
+	 * @param callable $callback Callback method to be executed
+	 * @param int $exptime Either an interval in seconds or a unix timestamp for expiry
+	 * @param int $attempts The amount of times to attempt a merge in case of failure
+	 * @return bool Success
+	 */
+	protected function mergeViaLock( $key, $callback, $exptime = 0, $attempts = 10 ) {
+		if ( !$this->lock( $key, 6 ) ) {
+			return false;
+		}
+
+		$currentValue = $this->get( $key );
+		// Derive the new value from the old value
+		$value = call_user_func( $callback, $this, $key, $currentValue );
+
+		if ( $value === false ) {
+			$success = true; // do nothing
+		} else {
+			$success = $this->set( $key, $value, $exptime ); // set the new value
+		}
+
+		if ( !$this->unlock( $key ) ) {
+			// this should never happen
+			trigger_error( "Could not release lock for key '$key'." );
+		}
+
+		return $success;
+	}
+
+	/**
+	 * @param string $key
+	 * @param int $timeout Lock wait timeout [optional]
+	 * @param int $expiry Lock expiry [optional]
+	 * @return bool Success
+	 */
+	public function lock( $key, $timeout = 6, $expiry = 6 ) {
+		$this->clearLastError();
+		$timestamp = microtime( true ); // starting UNIX timestamp
+		if ( $this->add( "{$key}:lock", 1, $expiry ) ) {
+			return true;
+		} elseif ( $this->getLastError() ) {
+			return false;
+		}
+
+		$uRTT = ceil( 1e6 * ( microtime( true ) - $timestamp ) ); // estimate RTT (us)
+		$sleep = 2 * $uRTT; // rough time to do get()+set()
+
+		$locked = false; // lock acquired
+		$attempts = 0; // failed attempts
+		do {
+			if ( ++$attempts >= 3 && $sleep <= 5e5 ) {
+				// Exponentially back off after failed attempts to avoid network spam.
+				// About 2*$uRTT*(2^n-1) us of "sleep" happen for the next n attempts.
+				$sleep *= 2;
+			}
+			usleep( $sleep ); // back off
+			$this->clearLastError();
+			$locked = $this->add( "{$key}:lock", 1, $expiry );
+			if ( $this->getLastError() ) {
+				return false;
+			}
+		} while ( !$locked && ( microtime( true ) - $timestamp ) < $timeout );
+
+		return $locked;
+	}
+
+	/**
+	 * @param string $key
+	 * @return bool Success
+	 */
+	public function unlock( $key ) {
+		return $this->delete( "{$key}:lock" );
+	}
+
+	/**
+	 * Delete all objects expiring before a certain date.
+	 * @param string $date The reference date in MW format
+	 * @param callable|bool $progressCallback Optional, a function which will be called
+	 *     regularly during long-running operations with the percentage progress
+	 *     as the first parameter.
+	 *
+	 * @return bool Success, false if unimplemented
+	 */
+	public function deleteObjectsExpiringBefore( $date, $progressCallback = false ) {
+		// stub
+		return false;
+	}
+
+	/* *** Emulated functions *** */
+
+	/**
+	 * Get an associative array containing the item for each of the keys that have items.
+	 * @param array $keys List of strings
+	 * @return array
+	 */
+	public function getMulti( array $keys ) {
+		$res = array();
+		foreach ( $keys as $key ) {
+			$val = $this->get( $key );
+			if ( $val !== false ) {
+				$res[$key] = $val;
+			}
+		}
+		return $res;
+	}
+
+	/**
+	 * Batch insertion
+	 * @param array $data $key => $value assoc array
+	 * @param int $exptime Either an interval in seconds or a unix timestamp for expiry
+	 * @return bool Success
+	 * @since 1.24
+	 */
+	public function setMulti( array $data, $exptime = 0 ) {
+		$res = true;
+		foreach ( $data as $key => $value ) {
+			if ( !$this->set( $key, $value, $exptime ) ) {
+				$res = false;
+			}
+		}
+		return $res;
+	}
+
+	/**
+	 * @param string $key
+	 * @param mixed $value
+	 * @param int $exptime
+	 * @return bool Success
+	 */
+	public function add( $key, $value, $exptime = 0 ) {
+		if ( $this->get( $key ) === false ) {
+			return $this->set( $key, $value, $exptime );
+		}
+		return false; // key already set
+	}
+
+	/**
+	 * Increase stored value of $key by $value while preserving its TTL
+	 * @param string $key Key to increase
+	 * @param int $value Value to add to $key (Default 1)
+	 * @return int|bool New value or false on failure
+	 */
+	public function incr( $key, $value = 1 ) {
+		if ( !$this->lock( $key ) ) {
+			return false;
+		}
+		$n = $this->get( $key );
+		if ( $this->isInteger( $n ) ) { // key exists?
+			$n += intval( $value );
+			$this->set( $key, max( 0, $n ) ); // exptime?
+		} else {
+			$n = false;
+		}
+		$this->unlock( $key );
+
+		return $n;
+	}
+
+	/**
+	 * Decrease stored value of $key by $value while preserving its TTL
+	 * @param string $key
+	 * @param int $value
+	 * @return int
+	 */
+	public function decr( $key, $value = 1 ) {
+		return $this->incr( $key, - $value );
+	}
+
+	/**
+	 * Increase stored value of $key by $value while preserving its TTL
+	 *
+	 * This will create the key with value $init and TTL $ttl if not present
+	 *
+	 * @param string $key
+	 * @param int $ttl
+	 * @param int $value
+	 * @param int $init
+	 * @return bool
+	 * @since 1.24
+	 */
+	public function incrWithInit( $key, $ttl, $value = 1, $init = 1 ) {
+		return $this->incr( $key, $value ) ||
+			$this->add( $key, (int)$init, $ttl ) || $this->incr( $key, $value );
+	}
+
+	/**
+	 * Get the "last error" registered; clearLastError() should be called manually
+	 * @return int ERR_* constant for the "last error" registry
+	 * @since 1.23
+	 */
+	public function getLastError() {
+		return $this->lastError;
+	}
+
+	/**
+	 * Clear the "last error" registry
+	 * @since 1.23
+	 */
+	public function clearLastError() {
+		$this->lastError = self::ERR_NONE;
+	}
+
+	/**
+	 * Set the "last error" registry
+	 * @param int $err ERR_* constant
+	 * @since 1.23
+	 */
+	protected function setLastError( $err ) {
+		$this->lastError = $err;
+	}
+
+	/**
+	 * @param string $text
+	 */
+	protected function debug( $text ) {
+		if ( $this->debugMode ) {
+			$this->logger->debug( "{class} debug: $text", array(
+				'class' => get_class( $this ),
+			) );
+		}
+	}
+
+	/**
+	 * Convert an optionally relative time to an absolute time
+	 * @param int $exptime
+	 * @return int
+	 */
+	protected function convertExpiry( $exptime ) {
+		if ( ( $exptime != 0 ) && ( $exptime < 86400 * 3650 /* 10 years */ ) ) {
+			return time() + $exptime;
+		} else {
+			return $exptime;
+		}
+	}
+
+	/**
+	 * Convert an optionally absolute expiry time to a relative time. If an
+	 * absolute time is specified which is in the past, use a short expiry time.
+	 *
+	 * @param int $exptime
+	 * @return int
+	 */
+	protected function convertToRelative( $exptime ) {
+		if ( $exptime >= 86400 * 3650 /* 10 years */ ) {
+			$exptime -= time();
+			if ( $exptime <= 0 ) {
+				$exptime = 1;
+			}
+			return $exptime;
+		} else {
+			return $exptime;
+		}
+	}
+
+	/**
+	 * Check if a value is an integer
+	 *
+	 * @param mixed $value
+	 * @return bool
+	 */
+	protected function isInteger( $value ) {
+		return ( is_int( $value ) || ctype_digit( $value ) );
+	}
+}
diff --git a/includes/libs/objectcache/EmptyBagOStuff.php b/includes/libs/objectcache/EmptyBagOStuff.php
new file mode 100644
index 00000000..4ccf2707
--- /dev/null
+++ b/includes/libs/objectcache/EmptyBagOStuff.php
@@ -0,0 +1,45 @@
+<?php
+/**
+ * Dummy object caching.
+ *
+ * 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
+ */
+
+/**
+ * A BagOStuff object with no objects in it. Used to provide a no-op object to calling code.
+ *
+ * @ingroup Cache
+ */
+class EmptyBagOStuff extends BagOStuff {
+	public function get( $key, &$casToken = null ) {
+		return false;
+	}
+
+	public function set( $key, $value, $exp = 0 ) {
+		return true;
+	}
+
+	public function delete( $key ) {
+		return true;
+	}
+
+	public function merge( $key, $callback, $exptime = 0, $attempts = 10 ) {
+		return true; // faster
+	}
+}
diff --git a/includes/libs/objectcache/HashBagOStuff.php b/includes/libs/objectcache/HashBagOStuff.php
new file mode 100644
index 00000000..2c8b05a5
--- /dev/null
+++ b/includes/libs/objectcache/HashBagOStuff.php
@@ -0,0 +1,87 @@
+<?php
+/**
+ * Object caching using PHP arrays.
+ *
+ * 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
+ */
+
+/**
+ * This is a test of the interface, mainly. It stores things in an associative
+ * array, which is not going to persist between program runs.
+ *
+ * @ingroup Cache
+ */
+class HashBagOStuff extends BagOStuff {
+	/** @var array */
+	protected $bag;
+
+	function __construct( $params = array() ) {
+		parent::__construct( $params );
+		$this->bag = array();
+	}
+
+	protected function expire( $key ) {
+		$et = $this->bag[$key][1];
+
+		if ( ( $et == 0 ) || ( $et > time() ) ) {
+			return false;
+		}
+
+		$this->delete( $key );
+
+		return true;
+	}
+
+	public function get( $key, &$casToken = null ) {
+		if ( !isset( $this->bag[$key] ) ) {
+			return false;
+		}
+
+		if ( $this->expire( $key ) ) {
+			return false;
+		}
+
+		$casToken = $this->bag[$key][0];
+
+		return $this->bag[$key][0];
+	}
+
+	public function set( $key, $value, $exptime = 0 ) {
+		$this->bag[$key] = array( $value, $this->convertExpiry( $exptime ) );
+		return true;
+	}
+
+	function delete( $key ) {
+		if ( !isset( $this->bag[$key] ) ) {
+			return false;
+		}
+
+		unset( $this->bag[$key] );
+
+		return true;
+	}
+
+	public function lock( $key, $timeout = 6, $expiry = 6 ) {
+		return true;
+	}
+
+	function unlock( $key ) {
+		return true;
+	}
+}
diff --git a/includes/libs/objectcache/WinCacheBagOStuff.php b/includes/libs/objectcache/WinCacheBagOStuff.php
new file mode 100644
index 00000000..53625746
--- /dev/null
+++ b/includes/libs/objectcache/WinCacheBagOStuff.php
@@ -0,0 +1,99 @@
+<?php
+/**
+ * Object caching using WinCache.
+ *
+ * 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
+ */
+
+/**
+ * Wrapper for WinCache object caching functions; identical interface
+ * to the APC wrapper
+ *
+ * @ingroup Cache
+ */
+class WinCacheBagOStuff extends BagOStuff {
+
+	/**
+	 * Get a value from the WinCache object cache
+	 *
+	 * @param string $key Cache key
+	 * @param int $casToken [optional] Cas token
+	 * @return mixed
+	 */
+	public function get( $key, &$casToken = null ) {
+		$val = wincache_ucache_get( $key );
+
+		$casToken = $val;
+
+		if ( is_string( $val ) ) {
+			$val = unserialize( $val );
+		}
+
+		return $val;
+	}
+
+	/**
+	 * Store a value in the WinCache object cache
+	 *
+	 * @param string $key Cache key
+	 * @param mixed $value Value to store
+	 * @param int $expire Expiration time
+	 * @return bool
+	 */
+	public function set( $key, $value, $expire = 0 ) {
+		$result = wincache_ucache_set( $key, serialize( $value ), $expire );
+
+		/* wincache_ucache_set returns an empty array on success if $value
+		   was an array, bool otherwise */
+		return ( is_array( $result ) && $result === array() ) || $result;
+	}
+
+	/**
+	 * Store a value in the WinCache object cache, race condition-safe
+	 *
+	 * @param int $casToken Cas token
+	 * @param string $key Cache key
+	 * @param int $value Object to store
+	 * @param int $exptime Expiration time
+	 * @return bool
+	 */
+	protected function cas( $casToken, $key, $value, $exptime = 0 ) {
+		return wincache_ucache_cas( $key, $casToken, serialize( $value ) );
+	}
+
+	/**
+	 * Remove a value from the WinCache object cache
+	 *
+	 * @param string $key Cache key
+	 * @return bool
+	 */
+	public function delete( $key ) {
+		wincache_ucache_delete( $key );
+
+		return true;
+	}
+
+	public function merge( $key, $callback, $exptime = 0, $attempts = 10 ) {
+		if ( !is_callable( $callback ) ) {
+			throw new Exception( "Got invalid callback." );
+		}
+
+		return $this->mergeViaCas( $key, $callback, $exptime, $attempts );
+	}
+}
diff --git a/includes/libs/objectcache/XCacheBagOStuff.php b/includes/libs/objectcache/XCacheBagOStuff.php
new file mode 100644
index 00000000..cfee9236
--- /dev/null
+++ b/includes/libs/objectcache/XCacheBagOStuff.php
@@ -0,0 +1,89 @@
+<?php
+/**
+ * Object caching using XCache.
+ *
+ * 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
+ */
+
+/**
+ * Wrapper for XCache object caching functions; identical interface
+ * to the APC wrapper
+ *
+ * @ingroup Cache
+ */
+class XCacheBagOStuff extends BagOStuff {
+	/**
+	 * Get a value from the XCache object cache
+	 *
+	 * @param string $key Cache key
+	 * @param mixed $casToken Cas token
+	 * @return mixed
+	 */
+	public function get( $key, &$casToken = null ) {
+		$val = xcache_get( $key );
+
+		if ( is_string( $val ) ) {
+			if ( $this->isInteger( $val ) ) {
+				$val = intval( $val );
+			} else {
+				$val = unserialize( $val );
+			}
+		} elseif ( is_null( $val ) ) {
+			return false;
+		}
+
+		return $val;
+	}
+
+	/**
+	 * Store a value in the XCache object cache
+	 *
+	 * @param string $key Cache key
+	 * @param mixed $value Object to store
+	 * @param int $expire Expiration time
+	 * @return bool
+	 */
+	public function set( $key, $value, $expire = 0 ) {
+		if ( !$this->isInteger( $value ) ) {
+			$value = serialize( $value );
+		}
+
+		xcache_set( $key, $value, $expire );
+		return true;
+	}
+
+	/**
+	 * Remove a value from the XCache object cache
+	 *
+	 * @param string $key Cache key
+	 * @return bool
+	 */
+	public function delete( $key ) {
+		xcache_unset( $key );
+		return true;
+	}
+
+	public function incr( $key, $value = 1 ) {
+		return xcache_inc( $key, $value );
+	}
+
+	public function decr( $key, $value = 1 ) {
+		return xcache_dec( $key, $value );
+	}
+}