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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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