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<?php /** * PHPExcel * * Copyright (c) 2006 - 2014 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 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel) * @license http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt LGPL * @version ##VERSION##, ##DATE## */
/** * PHPExcel_CachedObjectStorage_Memcache * * @category PHPExcel * @package PHPExcel_CachedObjectStorage * @copyright Copyright (c) 2006 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel) */ 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; } // function isDataSet()
/** * 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 $this->_currentObject; } // function getCacheData()
/** * Get a list of all cell addresses currently held in cache * * @return string[] */ public function getCellList() { if ($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); } // function deleteCacheData()
/** * 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 = $newCachePrefix; } // function copyCellCollection()
/** * Clear the cell collection and disconnect from our parent * * @return void */ public function unsetWorksheetCells() { if(!is_null($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; } // function unsetWorksheetCells()
/** * 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); } } // function __construct()
/** * 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'); } } // function __destruct()
/** * 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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