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308 lines
10 KiB
308 lines
10 KiB
<?php
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/**
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* PHPExcel_CachedObjectStorage_Memcache
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*
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* Copyright (c) 2006 - 2015 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 - 2015 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 ##VERSION##, ##DATE##
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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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/**
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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 $memcache = null;
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/**
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* Store cell data in cache for the current cell object if it's "dirty",
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* and the 'nullify' the current cell object
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*
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* @return void
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* @throws PHPExcel_Exception
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*/
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protected function storeData()
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{
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if ($this->currentCellIsDirty && !empty($this->currentObjectID)) {
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$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 PHPExcel_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 $cell Cell to update
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* @return PHPExcel_Cell
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* @throws PHPExcel_Exception
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*/
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public function addCacheData($pCoord, PHPExcel_Cell $cell)
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{
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if (($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 $pCoord Coordinate address of the cell to check
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* @return boolean
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* @return boolean
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*/
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public function isDataSet($pCoord)
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{
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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($pCoord);
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throw new PHPExcel_Exception('Cell entry '.$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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}
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/**
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* Get cell at a specific coordinate
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*
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* @param string $pCoord Coordinate of the cell
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* @throws PHPExcel_Exception
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* @return PHPExcel_Cell Cell that was found, or null if not found
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*/
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public function getCacheData($pCoord)
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{
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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($pCoord);
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throw new PHPExcel_Exception("Cell entry {$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($obj);
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// Re-attach this as the cell's parent
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$this->currentObject->attach($this);
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// Return requested entry
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return $this->currentObject;
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}
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/**
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* Get a list of all cell addresses currently held in cache
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*
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* @return string[]
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*/
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public function getCellList()
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{
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if ($this->currentObjectID !== null) {
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$this->storeData();
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}
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return parent::getCellList();
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}
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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 $pCoord Coordinate address of the cell to delete
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* @throws PHPExcel_Exception
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*/
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public function deleteCacheData($pCoord)
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{
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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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}
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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 $parent)
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{
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parent::copyCellCollection($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($cellID);
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throw new PHPExcel_Exception("Cell entry {$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 PHPExcel_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 = $newCachePrefix;
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}
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/**
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* Clear the cell collection and disconnect from our parent
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*
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* @return void
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*/
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public function unsetWorksheetCells()
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{
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if (!is_null($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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}
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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, $arguments)
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{
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$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 PHPExcel_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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}
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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 $port Memcache port
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* @throws PHPExcel_Exception
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*/
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public function failureCallback($host, $port)
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{
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throw new PHPExcel_Exception("memcache {$host}:{$port} failed");
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}
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/**
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* Destroy this cell collection
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*/
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public function __destruct()
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{
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$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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}
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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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{
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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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