<?php
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/**
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* PHPExcel
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*
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* Copyright (c) 2006 - 2012 PHPExcel
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* @category PHPExcel
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* @package PHPExcel_CachedObjectStorage
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* @copyright Copyright (c) 2006 - 2012 PHPExcel (http://www.codeplex.com/PHPExcel)
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* @license http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt LGPL
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* @version 1.7.7, 2012-05-19
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*/
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/**
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* PHPExcel_CachedObjectStorage_Memcache
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*
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* @category PHPExcel
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* @package PHPExcel_CachedObjectStorage
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* @copyright Copyright (c) 2006 - 2012 PHPExcel (http://www.codeplex.com/PHPExcel)
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*/
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class PHPExcel_CachedObjectStorage_Memcache extends PHPExcel_CachedObjectStorage_CacheBase implements PHPExcel_CachedObjectStorage_ICache {
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/**
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* Prefix used to uniquely identify cache data for this worksheet
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*
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* @var string
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*/
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private $_cachePrefix = null;
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/**
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* Cache timeout
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*
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* @var integer
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*/
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private $_cacheTime = 600;
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/**
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* Memcache interface
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*
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* @var resource
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*/
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private $_memcache = null;
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/**
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* Store cell data in cache for the current cell object if it's "dirty",
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* and the 'nullify' the current cell object
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*
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* @return void
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* @throws Exception
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*/
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private function _storeData() {
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if ($this->_currentCellIsDirty) {
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$this->_currentObject->detach();
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$obj = serialize($this->_currentObject);
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if (!$this->_memcache->replace($this->_cachePrefix.$this->_currentObjectID.'.cache',$obj,NULL,$this->_cacheTime)) {
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if (!$this->_memcache->add($this->_cachePrefix.$this->_currentObjectID.'.cache',$obj,NULL,$this->_cacheTime)) {
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$this->__destruct();
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throw new Exception('Failed to store cell '.$this->_currentObjectID.' in MemCache');
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}
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}
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$this->_currentCellIsDirty = false;
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}
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$this->_currentObjectID = $this->_currentObject = null;
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} // function _storeData()
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/**
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* Add or Update a cell in cache identified by coordinate address
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*
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* @param string $pCoord Coordinate address of the cell to update
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* @param PHPExcel_Cell $cell Cell to update
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* @return void
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* @throws Exception
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*/
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public function addCacheData($pCoord, PHPExcel_Cell $cell) {
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if (($pCoord !== $this->_currentObjectID) && ($this->_currentObjectID !== null)) {
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$this->_storeData();
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}
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$this->_cellCache[$pCoord] = true;
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$this->_currentObjectID = $pCoord;
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$this->_currentObject = $cell;
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$this->_currentCellIsDirty = true;
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return $cell;
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} // function addCacheData()
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/**
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* Is a value set in the current PHPExcel_CachedObjectStorage_ICache for an indexed cell?
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*
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* @param string $pCoord Coordinate address of the cell to check
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* @return void
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* @return boolean
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*/
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public function isDataSet($pCoord) {
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// Check if the requested entry is the current object, or exists in the cache
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if (parent::isDataSet($pCoord)) {
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if ($this->_currentObjectID == $pCoord) {
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return true;
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}
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// Check if the requested entry still exists in Memcache
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$success = $this->_memcache->get($this->_cachePrefix.$pCoord.'.cache');
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if ($success === false) {
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// Entry no longer exists in Memcache, so clear it from the cache array
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parent::deleteCacheData($pCoord);
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throw new Exception('Cell entry '.$pCoord.' no longer exists in MemCache');
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}
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return true;
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}
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return false;
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} // function isDataSet()
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/**
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* Get cell at a specific coordinate
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*
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* @param string $pCoord Coordinate of the cell
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* @throws Exception
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* @return PHPExcel_Cell Cell that was found, or null if not found
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*/
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public function getCacheData($pCoord) {
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if ($pCoord === $this->_currentObjectID) {
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return $this->_currentObject;
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}
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$this->_storeData();
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// Check if the entry that has been requested actually exists
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if (parent::isDataSet($pCoord)) {
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$obj = $this->_memcache->get($this->_cachePrefix.$pCoord.'.cache');
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if ($obj === false) {
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// Entry no longer exists in Memcache, so clear it from the cache array
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parent::deleteCacheData($pCoord);
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throw new Exception('Cell entry '.$pCoord.' no longer exists in MemCache');
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}
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} else {
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// Return null if requested entry doesn't exist in cache
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return null;
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}
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// Set current entry to the requested entry
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$this->_currentObjectID = $pCoord;
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$this->_currentObject = unserialize($obj);
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// Re-attach the parent worksheet
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$this->_currentObject->attach($this->_parent);
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// Return requested entry
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return $this->_currentObject;
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} // function getCacheData()
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/**
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* Delete a cell in cache identified by coordinate address
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*
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* @param string $pCoord Coordinate address of the cell to delete
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* @throws Exception
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*/
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public function deleteCacheData($pCoord) {
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// Delete the entry from Memcache
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$this->_memcache->delete($this->_cachePrefix.$pCoord.'.cache');
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// Delete the entry from our cell address array
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parent::deleteCacheData($pCoord);
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} // function deleteCacheData()
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/**
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* Clone the cell collection
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*
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* @param PHPExcel_Worksheet $parent The new worksheet
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* @return void
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*/
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public function copyCellCollection(PHPExcel_Worksheet $parent) {
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parent::copyCellCollection($parent);
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// Get a new id for the new file name
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$baseUnique = $this->_getUniqueID();
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$newCachePrefix = substr(md5($baseUnique),0,8).'.';
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$cacheList = $this->getCellList();
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foreach($cacheList as $cellID) {
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if ($cellID != $this->_currentObjectID) {
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$obj = $this->_memcache->get($this->_cachePrefix.$cellID.'.cache');
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if ($obj === false) {
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// Entry no longer exists in Memcache, so clear it from the cache array
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parent::deleteCacheData($cellID);
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throw new Exception('Cell entry '.$cellID.' no longer exists in MemCache');
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}
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if (!$this->_memcache->add($newCachePrefix.$cellID.'.cache',$obj,NULL,$this->_cacheTime)) {
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$this->__destruct();
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throw new Exception('Failed to store cell '.$cellID.' in MemCache');
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}
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}
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}
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$this->_cachePrefix = $newCachePrefix;
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} // function copyCellCollection()
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/**
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* Clear the cell collection and disconnect from our parent
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*
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* @return void
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*/
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public function unsetWorksheetCells() {
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if(!is_null($this->_currentObject)) {
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$this->_currentObject->detach();
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$this->_currentObject = $this->_currentObjectID = null;
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}
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// Flush the Memcache cache
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$this->__destruct();
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$this->_cellCache = array();
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// detach ourself from the worksheet, so that it can then delete this object successfully
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$this->_parent = null;
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} // function unsetWorksheetCells()
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/**
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* Initialise this new cell collection
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*
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* @param PHPExcel_Worksheet $parent The worksheet for this cell collection
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* @param array of mixed $arguments Additional initialisation arguments
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*/
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public function __construct(PHPExcel_Worksheet $parent, $arguments) {
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$memcacheServer = (isset($arguments['memcacheServer'])) ? $arguments['memcacheServer'] : 'localhost';
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$memcachePort = (isset($arguments['memcachePort'])) ? $arguments['memcachePort'] : 11211;
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$cacheTime = (isset($arguments['cacheTime'])) ? $arguments['cacheTime'] : 600;
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if (is_null($this->_cachePrefix)) {
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$baseUnique = $this->_getUniqueID();
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$this->_cachePrefix = substr(md5($baseUnique),0,8).'.';
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// Set a new Memcache object and connect to the Memcache server
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$this->_memcache = new Memcache();
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if (!$this->_memcache->addServer($memcacheServer, $memcachePort, false, 50, 5, 5, true, array($this, 'failureCallback'))) {
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throw new Exception('Could not connect to MemCache server at '.$memcacheServer.':'.$memcachePort);
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}
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$this->_cacheTime = $cacheTime;
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parent::__construct($parent);
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}
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} // function __construct()
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/**
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* Memcache error handler
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*
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* @param string $host Memcache server
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* @param integer $port Memcache port
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* @throws Exception
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*/
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public function failureCallback($host, $port) {
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throw new Exception('memcache '.$host.':'.$port.' failed');
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}
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/**
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* Destroy this cell collection
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*/
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public function __destruct() {
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$cacheList = $this->getCellList();
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foreach($cacheList as $cellID) {
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$this->_memcache->delete($this->_cachePrefix.$cellID.'.cache');
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}
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} // function __destruct()
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/**
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* Identify whether the caching method is currently available
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* Some methods are dependent on the availability of certain extensions being enabled in the PHP build
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*
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* @return boolean
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*/
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public static function cacheMethodIsAvailable() {
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if (!function_exists('memcache_add')) {
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return false;
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}
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return true;
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}
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}
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