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<?php /** * PHPExcel_CachedObjectStorage_Memcache * * 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_Memcache extends PHPExcel_CachedObjectStorage_CacheBase implements PHPExcel_CachedObjectStorage_ICache { /** * Prefix used to uniquely identify cache data for this worksheet * * @var string */ private $cachePrefix = null; /** * Cache timeout * * @var integer */ private $cacheTime = 600; /** * Memcache interface * * @var resource */ private $memcache = null; /** * Store cell data in cache for the current cell object if it's "dirty", * and the 'nullify' the current cell object * * @return void * @throws PHPExcel_Exception */ protected function storeData() { if ($this->currentCellIsDirty && !empty($this->currentObjectID)) { $this->currentObject->detach(); $obj = serialize($this->currentObject); if (!$this->memcache->replace($this->cachePrefix . $this->currentObjectID . '.cache', $obj, null, $this->cacheTime)) { if (!$this->memcache->add($this->cachePrefix . $this->currentObjectID . '.cache', $obj, null, $this->cacheTime)) { $this->__destruct(); throw new PHPExcel_Exception("Failed to store cell {$this->currentObjectID} in MemCache"); } } $this->currentCellIsDirty = false; } $this->currentObjectID = $this->currentObject = null; } // function _storeData() /** * Add or Update a cell in cache identified by coordinate address * * @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; } // function addCacheData() /** * Is a value set in the current PHPExcel_CachedObjectStorage_ICache for an indexed cell? * * @param string $pCoord Coordinate address of the cell to check * @return boolean * @return boolean */ public function isDataSet($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 Memcache $success = $this->memcache->get($this->cachePrefix.$pCoord.'.cache'); if ($success === false) { // Entry no longer exists in Memcache, so clear it from the cache array parent::deleteCacheData($pCoord); throw new PHPExcel_Exception('Cell entry '.$pCoord.' no longer exists in MemCache'); } return true; } return false; } /** * Get cell at a specific coordinate * * @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 = $this->memcache->get($this->cachePrefix . $pCoord . '.cache'); if ($obj === false) { // Entry no longer exists in Memcache, so clear it from the cache array parent::deleteCacheData($pCoord); throw new PHPExcel_Exception("Cell entry {$pCoord} no longer exists in MemCache"); } } 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 * * @param string $pCoord Coordinate address of the cell to delete * @throws PHPExcel_Exception */ public function deleteCacheData($pCoord) { // Delete the entry from Memcache $this->memcache->delete($this->cachePrefix . $pCoord . '.cache'); // Delete the entry from our cell address array parent::deleteCacheData($pCoord); } /** * Clone the cell collection * * @param PHPExcel_Worksheet $parent The new worksheet * @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 = $this->memcache->get($this->cachePrefix.$cellID.'.cache'); if ($obj === false) { // Entry no longer exists in Memcache, so clear it from the cache array parent::deleteCacheData($cellID); throw new PHPExcel_Exception("Cell entry {$cellID} no longer exists in MemCache"); } if (!$this->memcache->add($newCachePrefix . $cellID . '.cache', $obj, null, $this->cacheTime)) { $this->__destruct(); throw new PHPExcel_Exception("Failed to store cell {$cellID} in MemCache"); } } } $this->cachePrefix = $newCachePrefix; } /** * Clear the cell collection and disconnect from our parent * * @return void */ public function unsetWorksheetCells() { if (!is_null($this->currentObject)) { $this->currentObject->detach(); $this->currentObject = $this->currentObjectID = null; } // Flush the Memcache 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) { $memcacheServer = (isset($arguments['memcacheServer'])) ? $arguments['memcacheServer'] : 'localhost'; $memcachePort = (isset($arguments['memcachePort'])) ? $arguments['memcachePort'] : 11211; $cacheTime = (isset($arguments['cacheTime'])) ? $arguments['cacheTime'] : 600; if (is_null($this->cachePrefix)) { $baseUnique = $this->getUniqueID(); $this->cachePrefix = substr(md5($baseUnique), 0, 8) . '.'; // Set a new Memcache object and connect to the Memcache server $this->memcache = new Memcache(); if (!$this->memcache->addServer($memcacheServer, $memcachePort, false, 50, 5, 5, true, array($this, 'failureCallback'))) { throw new PHPExcel_Exception("Could not connect to MemCache server at {$memcacheServer}:{$memcachePort}"); } $this->cacheTime = $cacheTime; parent::__construct($parent); } } /** * Memcache error handler * * @param string $host Memcache server * @param integer $port Memcache port * @throws PHPExcel_Exception */ public function failureCallback($host, $port) { throw new PHPExcel_Exception("memcache {$host}:{$port} failed"); } /** * Destroy this cell collection */ public function __destruct() { $cacheList = $this->getCellList(); foreach ($cacheList as $cellID) { $this->memcache->delete($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('memcache_add')) { return false; } return true; } }
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