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463 lines
12 KiB
PHP
463 lines
12 KiB
PHP
<?php
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/**
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* Zend Framework
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*
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* LICENSE
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*
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* This source file is subject to the new BSD license that is bundled
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* with this package in the file LICENSE.txt.
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* It is also available through the world-wide-web at this URL:
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* http://framework.zend.com/license/new-bsd
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* If you did not receive a copy of the license and are unable to
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* obtain it through the world-wide-web, please send an email
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* to license@zend.com so we can send you a copy immediately.
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*
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* @package Zend_Memory
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* @copyright Copyright (c) 2005-2009 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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* @version $Id: Manager.php 16971 2009-07-22 18:05:45Z mikaelkael $
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*/
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/** Zend_Memory_Container_Movable */
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require_once 'Zend/Memory/Container/Movable.php';
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/** Zend_Memory_Container_Locked */
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require_once 'Zend/Memory/Container/Locked.php';
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/** Zend_Memory_AccessController */
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require_once 'Zend/Memory/AccessController.php';
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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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*
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* @category Zend
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* @package Zend_Memory
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* @copyright Copyright (c) 2005-2009 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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class Zend_Memory_Manager
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{
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/**
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* Object storage backend
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*
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* @var Zend_Cache_Backend_Interface
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*/
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private $_backend = 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 integer
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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 integer
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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 integer
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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 integer
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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 integer
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*/
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private $_managerId;
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/**
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* Tags array, used by backend to categorize stored values
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*
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* @var array
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*/
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private $_tags;
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/**
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* This function is intended to generate unique id, used by memory manager
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*/
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private function _generateMemManagerId()
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{
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/**
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* @todo !!!
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* uniqid() php function doesn't really garantee the id to be unique
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* it should be changed by something else
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* (Ex. backend interface should be extended to provide this functionality)
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*/
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$this->_managerId = uniqid('ZendMemManager', true);
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$this->_tags = array($this->_managerId);
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$this->_managerId .= '_';
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}
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/**
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* Memory manager constructor
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*
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* If backend is not specified, then memory objects are never swapped
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*
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* @param Zend_Cache_Backend $backend
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* @param array $backendOptions associative array of options for the corresponding backend constructor
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*/
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public function __construct($backend = null)
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{
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if ($backend === null) {
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return;
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}
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$this->_backend = $backend;
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$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 = (integer)$memoryLimitStr;
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switch (strtolower($memoryLimitStr[strlen($memoryLimitStr)-1])) {
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case 'g':
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$this->_memoryLimit *= 1024;
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// Break intentionally omitted
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case 'm':
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$this->_memoryLimit *= 1024;
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// Break intentionally omitted
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case 'k':
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$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 backend storage
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*/
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public function __destruct()
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{
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if ($this->_backend !== null) {
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$this->_backend->clean(Zend_Cache::CLEANING_MODE_MATCHING_TAG, $this->_tags);
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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 integer $newLimit
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* @throws Zend_Exception
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*/
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public function setMemoryLimit($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 integer
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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 integer $newSize
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*/
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public function setMinSize($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 integer
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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 $value
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* @return Zend_Memory_Container_Interface
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* @throws Zend_Memory_Exception
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*/
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public function create($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 $value
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* @return Zend_Memory_Container_Interface
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* @throws Zend_Memory_Exception
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*/
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public function createLocked($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 boolean $locked
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* @return Zend_Memory_Container_Interface
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* @throws Zend_Memory_Exception
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*/
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private function _create($value, $locked)
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{
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$id = $this->_nextId++;
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if ($locked || ($this->_backend === null) /* Use only memory locked objects if backend is not specified */) {
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return new Zend_Memory_Container_Locked($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 Zend_Memory_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 = $valueObject;
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return new Zend_Memory_AccessController($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 integer $id
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* @return Zend_Memory_Container
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*/
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public function unlink(Zend_Memory_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 integer $id
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*/
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public function processUpdate(Zend_Memory_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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$this->_swapCheck();
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}
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/**
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* Check and swap objects if necessary
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*
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* @throws Zend_MemoryException
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*/
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private function _swapCheck()
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{
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if ($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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require_once 'Zend/Memory/Exception.php';
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throw new Zend_Memory_Exception('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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* Actualy 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 integer $id
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*/
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private function _swap(Zend_Memory_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->_backend->save($container->getRef(), $this->_managerId . $id, $this->_tags);
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}
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$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 integer $id
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*/
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public function load(Zend_Memory_Container_Movable $container, $id)
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{
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$value = $this->_backend->load($this->_managerId . $id, true);
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// Try to swap other objects if necessary
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// (do not include specified object into check)
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$this->_memorySize += strlen($value);
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$this->_swapCheck();
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// Add loaded obect 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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