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432 lines
11 KiB
PHP
432 lines
11 KiB
PHP
<?php
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/**
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* Zend Framework (http://framework.zend.com/)
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*
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* @link http://github.com/zendframework/zf2 for the canonical source repository
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* @copyright Copyright (c) 2005-2014 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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*/
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namespace Zend\Memory;
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use Zend\Cache\Storage\ClearByNamespaceInterface as ClearByNamespaceCacheStorage;
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use Zend\Cache\Storage\FlushableInterface as FlushableCacheStorage;
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use Zend\Cache\Storage\StorageInterface as CacheStorage;
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/**
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* Memory manager
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*
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* This class encapsulates memory menagement operations, when PHP works
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* in limited memory mode.
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*/
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class MemoryManager
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{
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/**
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* Storage cache object
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*
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* @var CacheStorage
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*/
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private $cache = null;
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/**
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* Memory grow limit.
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* Default value is 2/3 of memory_limit php.ini variable
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* Negative value means no limit
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*
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* @var int
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*/
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private $memoryLimit = -1;
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/**
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* Minimum value size to be swapped.
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* Default value is 16K
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* Negative value means that memory objects are never swapped
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*
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* @var int
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*/
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private $minSize = 16384;
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/**
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* Overall size of memory, used by values
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*
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* @var int
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*/
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private $memorySize = 0;
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/**
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* Id for next Zend\Memory object
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*
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* @var int
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*/
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private $nextId = 0;
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/**
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* List of candidates to unload
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*
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* It also represents objects access history. Last accessed objects are moved to the end of array
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*
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* array(
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* <id> => <memory container object>,
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* ...
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* )
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*
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* @var array
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*/
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private $unloadCandidates = array();
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/**
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* List of object sizes.
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*
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* This list is used to calculate modification of object sizes
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*
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* array( <id> => <size>, ...)
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*
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* @var array
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*/
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private $sizes = array();
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/**
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* Last modified object
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*
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* It's used to reduce number of calls necessary to trace objects' modifications
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* Modification is not processed by memory manager until we do not switch to another
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* object.
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* So we have to trace only _first_ object modification and do nothing for others
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*
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* @var \Zend\Memory\Container\Movable
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*/
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private $lastModified = null;
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/**
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* Unique memory manager id
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*
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* @var int
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*/
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private $managerId;
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/**
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* This function is intended to generate unique id, used by memory manager
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*/
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private function generateMemManagerId()
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{
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/**
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* @todo !!!
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* uniqid() php function doesn't really guarantee the id to be unique
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* it should be changed by something else
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* (Ex. backend interface should be extended to provide this functionality)
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*/
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$this->managerId = str_replace('.', '_', uniqid('ZendMemManager', true)) . '_';
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}
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/**
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* Memory manager constructor
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*
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* If cache is not specified, then memory objects are never swapped
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*
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* @param CacheStorage $cache
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*/
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public function __construct(CacheStorage $cache = null)
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{
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if ($cache === null) {
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return;
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}
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$this->cache = $cache;
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$this->generateMemManagerId();
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$memoryLimitStr = trim(ini_get('memory_limit'));
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if ($memoryLimitStr != '' && $memoryLimitStr != -1) {
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$this->memoryLimit = (int) $memoryLimitStr;
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switch (strtolower($memoryLimitStr[strlen($memoryLimitStr) - 1])) {
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case 'g':
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$this->memoryLimit *= 1024;
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// no break
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case 'm':
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$this->memoryLimit *= 1024;
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// no break
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case 'k':
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$this->memoryLimit *= 1024;
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break;
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default:
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break;
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}
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$this->memoryLimit = (int) ($this->memoryLimit*2/3);
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} // No limit otherwise
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}
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/**
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* Object destructor
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*
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* Clean up cache storage
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*/
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public function __destruct()
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{
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if ($this->cache !== null) {
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if ($this->cache instanceof ClearByNamespaceCacheStorage) {
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$this->cache->clearByNamespace($this->cache->getOptions()->getNamespace());
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} elseif ($this->cache instanceof FlushableCacheStorage) {
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$this->cache->flush();
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}
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}
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}
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/**
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* Set memory grow limit
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*
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* @param int $newLimit
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*/
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public function setMemoryLimit($newLimit)
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{
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$this->memoryLimit = $newLimit;
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$this->swapCheck();
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}
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/**
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* Get memory grow limit
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*
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* @return int
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*/
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public function getMemoryLimit()
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{
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return $this->memoryLimit;
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}
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/**
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* Set minimum size of values, which may be swapped
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*
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* @param int $newSize
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*/
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public function setMinSize($newSize)
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{
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$this->minSize = $newSize;
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}
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/**
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* Get minimum size of values, which may be swapped
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*
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* @return int
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*/
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public function getMinSize()
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{
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return $this->minSize;
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}
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/**
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* Create new Zend\Memory value container
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*
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* @param string $value
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* @return Container\ContainerInterface
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* @throws Exception\ExceptionInterface
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*/
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public function create($value = '')
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{
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return $this->_create($value, false);
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}
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/**
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* Create new Zend\Memory value container, which has value always
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* locked in memory
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*
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* @param string $value
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* @return Container\ContainerInterface
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* @throws Exception\ExceptionInterface
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*/
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public function createLocked($value = '')
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{
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return $this->_create($value, true);
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}
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/**
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* Create new Zend\Memory object
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*
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* @param string $value
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* @param bool $locked
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* @return \Zend\Memory\Container\ContainerInterface
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* @throws \Zend\Memory\Exception\ExceptionInterface
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*/
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private function _create($value, $locked)
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{
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$id = $this->nextId++;
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if ($locked || ($this->cache === null) /* Use only memory locked objects if backend is not specified */) {
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return new Container\Locked($value);
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}
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// Commit other objects modifications
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$this->commit();
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$valueObject = new Container\Movable($this, $id, $value);
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// Store last object size as 0
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$this->sizes[$id] = 0;
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// prepare object for next modifications
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$this->lastModified = $valueObject;
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return new Container\AccessController($valueObject);
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}
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/**
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* Unlink value container from memory manager
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*
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* Used by Memory container destroy() method
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*
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* @internal
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* @param Container\Movable $container
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* @param int $id
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* @return null
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*/
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public function unlink(Container\Movable $container, $id)
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{
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if ($this->lastModified === $container) {
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// Drop all object modifications
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$this->lastModified = null;
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unset($this->sizes[$id]);
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return;
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}
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if (isset($this->unloadCandidates[$id])) {
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unset($this->unloadCandidates[$id]);
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}
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$this->memorySize -= $this->sizes[$id];
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unset($this->sizes[$id]);
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}
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/**
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* Process value update
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*
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* @internal
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* @param \Zend\Memory\Container\Movable $container
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* @param int $id
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*/
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public function processUpdate(Container\Movable $container, $id)
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{
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/**
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* This method is automatically invoked by memory container only once per
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* "modification session", but user may call memory container touch() method
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* several times depending on used algorithm. So we have to use this check
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* to optimize this case.
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*/
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if ($container === $this->lastModified) {
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return;
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}
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// Remove just updated object from list of candidates to unload
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if (isset($this->unloadCandidates[$id])) {
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unset($this->unloadCandidates[$id]);
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}
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// Reduce used memory mark
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$this->memorySize -= $this->sizes[$id];
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// Commit changes of previously modified object if necessary
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$this->commit();
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$this->lastModified = $container;
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}
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/**
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* Commit modified object and put it back to the loaded objects list
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*/
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private function commit()
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{
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if (($container = $this->lastModified) === null) {
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return;
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}
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$this->lastModified = null;
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$id = $container->getId();
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// Calculate new object size and increase used memory size by this value
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$this->memorySize += ($this->sizes[$id] = strlen($container->getRef()));
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if ($this->sizes[$id] > $this->minSize) {
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// Move object to "unload candidates list"
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$this->unloadCandidates[$id] = $container;
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}
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$container->startTrace();
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$this->swapCheck();
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}
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/**
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* Check and swap objects if necessary
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*
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* @throws Exception\RuntimeException
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*/
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private function swapCheck()
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{
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if ($this->memoryLimit < 0 || $this->memorySize < $this->memoryLimit) {
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// Memory limit is not reached
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// Do nothing
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return;
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}
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// walk through loaded objects in access history order
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foreach ($this->unloadCandidates as $id => $container) {
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$this->swap($container, $id);
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unset($this->unloadCandidates[$id]);
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if ($this->memorySize < $this->memoryLimit) {
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// We've swapped enough objects
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return;
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}
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}
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throw new Exception\RuntimeException('Memory manager can\'t get enough space.');
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}
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/**
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* Swap object data to disk
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* Actually swaps data or only unloads it from memory,
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* if object is not changed since last swap
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*
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* @param \Zend\Memory\Container\Movable $container
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* @param int $id
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*/
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private function swap(Container\Movable $container, $id)
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{
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if ($container->isLocked()) {
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return;
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}
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if (!$container->isSwapped()) {
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$this->cache->setItem($this->managerId . $id, $container->getRef());
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}
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$this->memorySize -= $this->sizes[$id];
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$container->markAsSwapped();
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$container->unloadValue();
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}
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/**
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* Load value from swap file.
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*
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* @internal
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* @param \Zend\Memory\Container\Movable $container
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* @param int $id
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*/
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public function load(Container\Movable $container, $id)
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{
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$value = $this->cache->getItem($this->managerId . $id);
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// Try to swap other objects if necessary
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// (do not include specified object into check)
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$this->memorySize += strlen($value);
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$this->swapCheck();
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// Add loaded object to the end of loaded objects list
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$container->setValue($value);
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if ($this->sizes[$id] > $this->minSize) {
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// Add object to the end of "unload candidates list"
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$this->unloadCandidates[$id] = $container;
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}
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}
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}
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