mirror of
https://github.com/sibyperiyar/Easy-HotSpot.git
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371 lines
11 KiB
PHP
371 lines
11 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;
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/**
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* Used as a catch-all for adapter initialization.
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*/
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use Exception as E;
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/**
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* Implements this class.
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*/
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use IteratorAggregate;
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/**
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* Used on failures by this class.
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*/
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use PEAR2\Cache\SHM\InvalidArgumentException;
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/**
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* Main class for this package.
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*
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* Automatically chooses an adapter based on the available extensions.
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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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abstract class SHM implements IteratorAggregate
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{
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/**
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* @var array An array of adapter names that meet their requirements.
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*/
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private static $_adapters = 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. Adapter is automatically
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* chosen based on the available extensions.
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*
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* @param string $persistentId The ID for the storage.
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*
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* @return static|SHM A new instance of an SHM adapter (child of this
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* class).
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*/
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final public static function factory($persistentId)
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{
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foreach (self::$_adapters as $adapter) {
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try {
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return new $adapter($persistentId);
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} catch (E $e) {
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//In case of a runtime error, try to fallback to other adapters.
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}
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}
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throw new InvalidArgumentException(
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'No appropriate adapter available',
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1
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);
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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 true;
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}
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/**
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* Registers an adapter.
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*
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* Registers an SHM adapter, allowing you to call it with {@link factory()}.
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*
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* @param string $adapter FQCN of adapter. A valid adapter is one that
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* extends this class. The class will be autoloaded if not already
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* present.
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* @param bool $prepend Whether to prepend this adapter into the list of
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* possible adapters, instead of appending to it.
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*
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* @return bool TRUE on success, FALSE on failure.
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*/
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final public static function registerAdapter($adapter, $prepend = false)
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{
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if (class_exists($adapter, true)
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&& is_subclass_of($adapter, '\\' . __CLASS__)
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&& $adapter::isMeetingRequirements()
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) {
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if ($prepend) {
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self::$_adapters = array_merge(
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array($adapter),
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self::$_adapters
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);
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} else {
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self::$_adapters[] = $adapter;
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}
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return true;
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}
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return false;
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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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* Adds 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 $ttl Seconds to store the value. If set to 0 indicates no
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* time limit.
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*
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* @return bool TRUE on success, FALSE on failure.
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*/
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public function __invoke($key, $value, $ttl = 0)
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{
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return $this->add($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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* This is a magic method, thanks to which any property you attempt to get
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* the value of will be fetched from the adapter, treating the property name
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* as the key of the value to get.
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*
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* @param string $key Name of key to get.
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*
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* @return mixed The current value of the specified key.
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*/
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public function __get($key)
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{
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return $this->get($key);
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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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* This is a magic method, thanks to which any property you attempt to set
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* the value of will be set by the adapter, treating the property name as
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* the key of the value to set. The value is set without a TTL.
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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 $value Value for the specified key.
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*
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* @return bool TRUE on success, FALSE on failure.
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*/
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public function __set($key, $value)
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{
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return $this->set($key, $value);
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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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* This is a magic method, thanks to which any property you call isset() on
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* will be checked by the adapter, treating the property name as the key
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* of the value to check.
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*
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* @param string $key Name of key to check.
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*
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* @return bool TRUE if the key is in the storage, FALSE otherwise.
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*/
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public function __isset($key)
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{
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return $this->exists($key);
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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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* This is a magic method, thanks to which any property you attempt to unset
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* the value of will be unset by the adapter, treating the property name as
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* the key of the value to delete.
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*
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* @param string $key Name of key to delete.
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*
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* @return bool TRUE on success, FALSE on failure.
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*/
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public function __unset($key)
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{
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return $this->delete($key);
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}
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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 $persistentId The ID for the storage. The storage will be
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* reused if it exists, or created if it doesn't exist. Data and locks
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* are namespaced by this ID.
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*/
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abstract public function __construct($persistentId);
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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 $timeout If the lock can't be immediatly obtained, the
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* script will block for at most the specified amount of seconds.
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* Setting this to 0 makes lock obtaining non blocking, and setting it
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* to NULL makes it block without a time limit.
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*
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* @return bool TRUE on success, FALSE on failure.
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*/
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abstract public function lock($key, $timeout = null);
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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 $persistentId.
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*
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* @return bool TRUE on success, FALSE on failure.
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*/
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abstract public function unlock($key);
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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 $key Name of key to check.
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*
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* @return bool TRUE if the key is in the storage, FALSE otherwise.
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*/
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abstract public function exists($key);
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/**
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* Adds a value to the shared memory storage.
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*
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* Adds 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 $ttl Seconds to store the value. If set to 0 indicates no
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* time limit.
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*
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* @return bool TRUE on success, FALSE on failure.
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*/
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abstract public function add($key, $value, $ttl = 0);
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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 $ttl Seconds to store the value. If set to 0 indicates no
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* time limit.
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*
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* @return bool TRUE on success, FALSE on failure.
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*/
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abstract public function set($key, $value, $ttl = 0);
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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 $key Name of key to get the value of.
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*
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* @return mixed The current value of the specified key.
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*/
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abstract public function get($key);
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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 $key Name of key to delete.
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*
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* @return bool TRUE on success, FALSE on failure.
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*/
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abstract public function delete($key);
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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 $step Value to increase the key by.
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*
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* @return int The new value.
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*/
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abstract public function inc($key, $step = 1);
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/**
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* Decreases a value from the shared memory storage.
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*
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* Decreases a value from the shared memory storage. Unlike a plain
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* set($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 $step Value to decrease the key by.
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*
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* @return int The new value.
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*/
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abstract public function dec($key, $step = 1);
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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 $new The value to set the key to.
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*
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* @return bool TRUE on success, FALSE on failure.
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*/
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abstract public function cas($key, $old, $new);
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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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abstract public function clear();
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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 \Traversable An array with all matching keys as array keys,
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* and values as array values. If $keysOnly is TRUE, the array keys are
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* numeric, and the array values are key names.
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*/
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abstract public function getIterator($filter = null, $keysOnly = false);
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}
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SHM::registerAdapter('\\' . __NAMESPACE__ . '\SHM\Adapter\Placebo');
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SHM::registerAdapter('\\' . __NAMESPACE__ . '\SHM\Adapter\Wincache');
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SHM::registerAdapter('\\' . __NAMESPACE__ . '\SHM\Adapter\APC');
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