Memcache.php in Loft Data Grids 6.2

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vendor/phpoffice/phpexcel/Classes/PHPExcel/CachedObjectStorage/Memcache.php

<?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;
  }

}

Classes

Name	Description
PHPExcel_CachedObjectStorage_Memcache	PHPExcel_CachedObjectStorage_Memcache