384 lines
12 KiB
PHP
384 lines
12 KiB
PHP
<?php
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/**
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* ~~summary~~
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*
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* ~~description~~
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*
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* PHP version 5
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*
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* @category Caching
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* @package PEAR2_Cache_SHM
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* @author Vasil Rangelov <boen.robot@gmail.com>
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* @copyright 2011 Vasil Rangelov
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* @license http://www.gnu.org/copyleft/lesser.html LGPL License 2.1
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* @version 0.1.3
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* @link http://pear2.php.net/PEAR2_Cache_SHM
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*/
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/**
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* The namespace declaration.
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*/
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namespace PEAR2\Cache\SHM\Adapter;
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/**
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* Throws exceptions from this namespace, and extends from this class.
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*/
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use PEAR2\Cache\SHM;
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/**
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* {@link Wincache::getIterator()} returns this object.
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*/
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use ArrayObject;
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/**
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* Shared memory adapter for the WinCache extension.
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*
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* @category Caching
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* @package PEAR2_Cache_SHM
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* @author Vasil Rangelov <boen.robot@gmail.com>
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* @license http://www.gnu.org/copyleft/lesser.html LGPL License 2.1
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* @link http://pear2.php.net/PEAR2_Cache_SHM
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*/
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class Wincache extends SHM
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{
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/**
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* @var string ID of the current storage.
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*/
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protected $persistentId;
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/**
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* List of persistent IDs.
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*
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* A list of persistent IDs within the current request (as keys) with an int
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* (as a value) specifying the number of instances in the current request.
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* Used as an attempt to ensure implicit lock releases on destruction.
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* @var array
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*/
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protected static $requestInstances = array();
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/**
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* @var array Array of lock names obtained during the current request.
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*/
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protected static $locksBackup = array();
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/**
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* Creates a new shared memory storage.
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*
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* Estabilishes a separate persistent storage.
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*
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* @param string $persistentId The ID for the storage. The storage will be
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* reused if it exists, or created if it doesn't exist. Data and locks
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* are namespaced by this ID.
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*/
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public function __construct($persistentId)
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{
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$this->persistentId
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= static::encodeLockName(__CLASS__ . ' ' . $persistentId) . ' ';
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if (isset(static::$requestInstances[$this->persistentId])) {
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static::$requestInstances[$this->persistentId]++;
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} else {
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static::$requestInstances[$this->persistentId] = 1;
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static::$locksBackup[$this->persistentId] = array();
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}
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}
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/**
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* Encodes a lock name
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*
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* Encodes a lock name, so that it can be properly obtained. The scheme used
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* is a subset of URL encoding, with only the "%" and "\" characters being
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* escaped. The encoding itself is necessary, since lock names can't contain
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* the "\" character.
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*
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* @param string $name The lock name to encode.
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*
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* @return string The encoded name.
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* @link http://msdn.microsoft.com/en-us/library/ms682411(VS.85).aspx
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*/
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protected static function encodeLockName($name)
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{
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return str_replace(array('%', '\\'), array('%25', '%5C'), $name);
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}
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/**
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* Checks if the adapter meets its requirements.
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*
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* @return bool TRUE on success, FALSE on failure.
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*/
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public static function isMeetingRequirements()
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{
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return extension_loaded('wincache')
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&& version_compare(phpversion('wincache'), '1.1.0', '>=')
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&& ini_get('wincache.ucenabled')
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&& ('cli' !== PHP_SAPI || ini_get('wincache.enablecli'));
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}
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/**
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* Releases any locks obtained by this instance as soon as there are no more
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* references to the object's persistent ID.
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*/
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public function __destruct()
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{
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if (0 === --static::$requestInstances[$this->persistentId]) {
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foreach (static::$locksBackup[$this->persistentId] as $key) {
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wincache_unlock(
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$this->persistentId . static::encodeLockName($key)
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);
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}
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}
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}
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/**
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* Obtains a named lock.
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*
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* @param string $key Name of the key to obtain. Note that $key may
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* repeat for each distinct $persistentId.
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* @param double $timeout Ignored with WinCache. Script will always block if
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* the lock can't be immediatly obtained.
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*
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* @return bool TRUE on success, FALSE on failure.
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*/
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public function lock($key, $timeout = null)
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{
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$result = wincache_lock(
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$this->persistentId . static::encodeLockName($key)
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);
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if ($result) {
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static::$locksBackup[$this->persistentId] = $key;
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}
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return $result;
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}
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/**
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* Releases a named lock.
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*
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* @param string $key Name of the key to release. Note that $key may
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* repeat for each distinct $persistentId.
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*
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* @return bool TRUE on success, FALSE on failure.
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*/
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public function unlock($key)
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{
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$result = wincache_unlock(
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$this->persistentId . static::encodeLockName($key)
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);
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if ($result) {
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unset(static::$locksBackup[$this->persistentId][array_search(
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$key,
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static::$locksBackup[$this->persistentId],
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true
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)]);
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}
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return $result;
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}
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/**
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* Checks if a specified key is in the storage.
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*
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* @param string $key Name of key to check.
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*
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* @return bool TRUE if the key is in the storage, FALSE otherwise.
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*/
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public function exists($key)
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{
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return wincache_ucache_exists($this->persistentId . $key);
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}
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/**
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* Adds a value to the shared memory storage.
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*
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* Sets a value to the storage if it doesn't exist, or fails if it does.
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*
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* @param string $key Name of key to associate the value with.
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* @param mixed $value Value for the specified key.
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* @param int $ttl Seconds to store the value. If set to 0 indicates no
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* time limit.
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*
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* @return bool TRUE on success, FALSE on failure.
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*/
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public function add($key, $value, $ttl = 0)
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{
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return wincache_ucache_add($this->persistentId . $key, $value, $ttl);
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}
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/**
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* Sets a value in the shared memory storage.
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*
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* Adds a value to the storage if it doesn't exist, overwrites it otherwise.
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*
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* @param string $key Name of key to associate the value with.
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* @param mixed $value Value for the specified key.
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* @param int $ttl Seconds to store the value. If set to 0 indicates no
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* time limit.
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*
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* @return bool TRUE on success, FALSE on failure.
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*/
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public function set($key, $value, $ttl = 0)
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{
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return wincache_ucache_set($this->persistentId . $key, $value, $ttl);
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}
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/**
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* Gets a value from the shared memory storage.
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*
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* Gets the current value, or throws an exception if it's not stored.
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*
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* @param string $key Name of key to get the value of.
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*
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* @return mixed The current value of the specified key.
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*/
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public function get($key)
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{
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$value = wincache_ucache_get($this->persistentId . $key, $success);
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if (!$success) {
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throw new SHM\InvalidArgumentException(
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'Unable to fetch key. No such key, or key has expired.',
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300
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);
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}
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return $value;
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}
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/**
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* Deletes a value from the shared memory storage.
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*
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* @param string $key Name of key to delete.
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*
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* @return bool TRUE on success, FALSE on failure.
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*/
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public function delete($key)
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{
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return wincache_ucache_delete($this->persistentId . $key);
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}
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/**
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* Increases a value from the shared memory storage.
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*
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* Increases a value from the shared memory storage. Unlike a plain
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* set($key, get($key)+$step) combination, this function also implicitly
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* performs locking.
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*
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* @param string $key Name of key to increase.
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* @param int $step Value to increase the key by.
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*
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* @return int The new value.
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*/
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public function inc($key, $step = 1)
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{
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$newValue = wincache_ucache_inc(
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$this->persistentId . $key,
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(int) $step,
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$success
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);
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if (!$success) {
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throw new SHM\InvalidArgumentException(
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'Unable to increase the value. Are you sure the value is int?',
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301
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);
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}
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return $newValue;
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}
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/**
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* Decreases a value from the shared memory storage.
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*
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* Decreases a value from the shared memory storage. Unlike a plain
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* set($key, get($key)-$step) combination, this function also implicitly
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* performs locking.
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*
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* @param string $key Name of key to decrease.
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* @param int $step Value to decrease the key by.
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*
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* @return int The new value.
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*/
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public function dec($key, $step = 1)
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{
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$newValue = wincache_ucache_dec(
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$this->persistentId . $key,
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(int) $step,
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$success
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);
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if (!$success) {
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throw new SHM\InvalidArgumentException(
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'Unable to decrease the value. Are you sure the value is int?',
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302
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);
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}
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return $newValue;
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}
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/**
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* Sets a new value if a key has a certain value.
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*
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* Sets a new value if a key has a certain value. This function only works
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* when $old and $new are longs.
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*
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* @param string $key Key of the value to compare and set.
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* @param int $old The value to compare the key against.
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* @param int $new The value to set the key to.
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*
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* @return bool TRUE on success, FALSE on failure.
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*/
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public function cas($key, $old, $new)
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{
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return wincache_ucache_cas($this->persistentId . $key, $old, $new);
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}
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/**
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* Clears the persistent storage.
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*
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* Clears the persistent storage, i.e. removes all keys. Locks are left
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* intact.
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*
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* @return void
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*/
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public function clear()
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{
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$info = wincache_ucache_info();
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foreach ($info['ucache_entries'] as $entry) {
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if (!$entry['is_session']
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&& 0 === strpos($entry['key_name'], $this->persistentId)
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) {
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wincache_ucache_delete($entry['key_name']);
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}
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}
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}
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/**
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* Retrieve an external iterator
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*
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* Returns an external iterator.
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*
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* @param string|null $filter A PCRE regular expression.
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* Only matching keys will be iterated over.
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* Setting this to NULL matches all keys of this instance.
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* @param bool $keysOnly Whether to return only the keys,
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* or return both the keys and values.
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*
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* @return ArrayObject An array with all matching keys as array keys,
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* and values as array values. If $keysOnly is TRUE, the array keys are
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* numeric, and the array values are key names.
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*/
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public function getIterator($filter = null, $keysOnly = false)
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{
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$info = wincache_ucache_info();
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$result = array();
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foreach ($info['ucache_entries'] as $entry) {
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if (!$entry['is_session']
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&& 0 === strpos($entry['key_name'], $this->persistentId)
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) {
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$localKey = strstr($entry['key_name'], $this->persistentId);
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if (null === $filter || preg_match($filter, $localKey)) {
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if ($keysOnly) {
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$result[] = $localKey;
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} else {
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$result[$localKey] = apc_fetch($localKey);
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}
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}
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}
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}
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return new ArrayObject($result);
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}
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}
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