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<?php /** * PHPExcel_CachedObjectStorage_APC * * Copyright (c) 2006 - 2015 PHPExcel * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * * @category PHPExcel * @package PHPExcel_CachedObjectStorage * @copyright Copyright (c) 2006 - 2015 PHPExcel (http://www.codeplex.com/PHPExcel) * @license http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt LGPL * @version ##VERSION##, ##DATE## */ class PHPExcel_CachedObjectStorage_APC extends PHPExcel_CachedObjectStorage_CacheBase implements PHPExcel_CachedObjectStorage_ICache { /** * Prefix used to uniquely identify cache data for this worksheet * * @access private * @var string */ private $cachePrefix = null; /** * Cache timeout * * @access private * @var integer */ private $cacheTime = 600; /** * Store cell data in cache for the current cell object if it's "dirty", * and the 'nullify' the current cell object * * @access private * @return void * @throws PHPExcel_Exception */ protected function storeData() { if ($this->currentCellIsDirty && !empty($this->currentObjectID)) { $this->currentObject->detach(); if (!apc_store( $this->cachePrefix . $this->currentObjectID . '.cache', serialize($this->currentObject), $this->cacheTime )) { $this->__destruct(); throw new PHPExcel_Exception('Failed to store cell ' . $this->currentObjectID . ' in APC'); } $this->currentCellIsDirty = false; } $this->currentObjectID = $this->currentObject = null; } /** * Add or Update a cell in cache identified by coordinate address * * @access public * @param string $pCoord Coordinate address of the cell to update * @param PHPExcel_Cell $cell Cell to update * @return PHPExcel_Cell * @throws PHPExcel_Exception */ public function addCacheData($pCoord, PHPExcel_Cell $cell) { if (($pCoord !== $this->currentObjectID) && ($this->currentObjectID !== null)) { $this->storeData(); } $this->cellCache[$pCoord] = true; $this->currentObjectID = $pCoord; $this->currentObject = $cell; $this->currentCellIsDirty = true; return $cell; } /** * Is a value set in the current PHPExcel_CachedObjectStorage_ICache for an indexed cell? * * @access public * @param string $pCoord Coordinate address of the cell to check * @throws PHPExcel_Exception * @return boolean */ public function isDataSet($pCoord) { // Check if the requested entry is the current object, or exists in the cache if (parent::isDataSet($pCoord)) { if ($this->currentObjectID == $pCoord) { return true; } // Check if the requested entry still exists in apc $success = apc_fetch($this->cachePrefix.$pCoord.'.cache'); if ($success === false) { // Entry no longer exists in APC, so clear it from the cache array parent::deleteCacheData($pCoord); throw new PHPExcel_Exception('Cell entry '.$pCoord.' no longer exists in APC cache'); } return true; } return false; } /** * Get cell at a specific coordinate * * @access public * @param string $pCoord Coordinate of the cell * @throws PHPExcel_Exception * @return PHPExcel_Cell Cell that was found, or null if not found */ public function getCacheData($pCoord) { if ($pCoord === $this->currentObjectID) { return $this->currentObject; } $this->storeData(); // Check if the entry that has been requested actually exists if (parent::isDataSet($pCoord)) { $obj = apc_fetch($this->cachePrefix . $pCoord . '.cache'); if ($obj === false) { // Entry no longer exists in APC, so clear it from the cache array parent::deleteCacheData($pCoord); throw new PHPExcel_Exception('Cell entry '.$pCoord.' no longer exists in APC cache'); } } else { // Return null if requested entry doesn't exist in cache return null; } // Set current entry to the requested entry $this->currentObjectID = $pCoord; $this->currentObject = unserialize($obj); // Re-attach this as the cell's parent $this->currentObject->attach($this); // Return requested entry return $this->currentObject; } /** * Get a list of all cell addresses currently held in cache * * @return string[] */ public function getCellList() { if ($this->currentObjectID !== null) { $this->storeData(); } return parent::getCellList(); } /** * Delete a cell in cache identified by coordinate address * * @access public * @param string $pCoord Coordinate address of the cell to delete * @throws PHPExcel_Exception */ public function deleteCacheData($pCoord) { // Delete the entry from APC apc_delete($this->cachePrefix.$pCoord.'.cache'); // Delete the entry from our cell address array parent::deleteCacheData($pCoord); } /** * Clone the cell collection * * @access public * @param PHPExcel_Worksheet $parent The new worksheet * @throws PHPExcel_Exception * @return void */ public function copyCellCollection(PHPExcel_Worksheet $parent) { parent::copyCellCollection($parent); // Get a new id for the new file name $baseUnique = $this->getUniqueID(); $newCachePrefix = substr(md5($baseUnique), 0, 8) . '.'; $cacheList = $this->getCellList(); foreach ($cacheList as $cellID) { if ($cellID != $this->currentObjectID) { $obj = apc_fetch($this->cachePrefix . $cellID . '.cache'); if ($obj === false) { // Entry no longer exists in APC, so clear it from the cache array parent::deleteCacheData($cellID); throw new PHPExcel_Exception('Cell entry ' . $cellID . ' no longer exists in APC'); } if (!apc_store($newCachePrefix . $cellID . '.cache', $obj, $this->cacheTime)) { $this->__destruct(); throw new PHPExcel_Exception('Failed to store cell ' . $cellID . ' in APC'); } } } $this->cachePrefix = $newCachePrefix; } /** * Clear the cell collection and disconnect from our parent * * @return void */ public function unsetWorksheetCells() { if ($this->currentObject !== null) { $this->currentObject->detach(); $this->currentObject = $this->currentObjectID = null; } // Flush the APC cache $this->__destruct(); $this->cellCache = array(); // detach ourself from the worksheet, so that it can then delete this object successfully $this->parent = null; } /** * Initialise this new cell collection * * @param PHPExcel_Worksheet $parent The worksheet for this cell collection * @param array of mixed $arguments Additional initialisation arguments */ public function __construct(PHPExcel_Worksheet $parent, $arguments) { $cacheTime = (isset($arguments['cacheTime'])) ? $arguments['cacheTime'] : 600; if ($this->cachePrefix === null) { $baseUnique = $this->getUniqueID(); $this->cachePrefix = substr(md5($baseUnique), 0, 8) . '.'; $this->cacheTime = $cacheTime; parent::__construct($parent); } } /** * Destroy this cell collection */ public function __destruct() { $cacheList = $this->getCellList(); foreach ($cacheList as $cellID) { apc_delete($this->cachePrefix . $cellID . '.cache'); } } /** * Identify whether the caching method is currently available * Some methods are dependent on the availability of certain extensions being enabled in the PHP build * * @return boolean */ public static function cacheMethodIsAvailable() { if (!function_exists('apc_store')) { return false; } if (apc_sma_info() === false) { return false; } return true; } }
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