APC.php in Loft Data Grids 6.2

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vendor/phpoffice/phpexcel/Classes/PHPExcel/CachedObjectStorage/APC.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_APC
 *
 * @category   PHPExcel
 * @package    PHPExcel_CachedObjectStorage
 * @copyright  Copyright (c) 2006 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel)
 */
class PHPExcel_CachedObjectStorage_APC extends PHPExcel_CachedObjectStorage_CacheBase implements PHPExcel_CachedObjectStorage_ICache {

  /**
   * Prefix used to uniquely identify cache data for this worksheet
   *
   * @access    private
   * @var string
   */
  private $_cachePrefix = null;

  /**
   * Cache timeout
   *
   * @access    private
   * @var integer
   */
  private $_cacheTime = 600;

  /**
   * Store cell data in cache for the current cell object if it's "dirty",
   *     and the 'nullify' the current cell object
   *
   * @access  private
   * @return  void
   * @throws  PHPExcel_Exception
   */
  protected function _storeData() {
    if ($this->_currentCellIsDirty && !empty($this->_currentObjectID)) {
      $this->_currentObject
        ->detach();
      if (!apc_store($this->_cachePrefix . $this->_currentObjectID . '.cache', serialize($this->_currentObject), $this->_cacheTime)) {
        $this
          ->__destruct();
        throw new PHPExcel_Exception('Failed to store cell ' . $this->_currentObjectID . ' in APC');
      }
      $this->_currentCellIsDirty = false;
    }
    $this->_currentObjectID = $this->_currentObject = null;
  }

  //    function _storeData()

  /**
   * Add or Update a cell in cache identified by coordinate address
   *
   * @access  public
   * @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?
   *
   * @access  public
   * @param   string  $pCoord  Coordinate address of the cell to check
   * @throws  PHPExcel_Exception
   * @return  boolean
   */
  public function isDataSet($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 apc
      $success = apc_fetch($this->_cachePrefix . $pCoord . '.cache');
      if ($success === FALSE) {

        //    Entry no longer exists in APC, so clear it from the cache array
        parent::deleteCacheData($pCoord);
        throw new PHPExcel_Exception('Cell entry ' . $pCoord . ' no longer exists in APC cache');
      }
      return true;
    }
    return false;
  }

  //    function isDataSet()

  /**
   * Get cell at a specific coordinate
   *
   * @access  public
   * @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)) {
      $obj = apc_fetch($this->_cachePrefix . $pCoord . '.cache');
      if ($obj === FALSE) {

        //    Entry no longer exists in APC, so clear it from the cache array
        parent::deleteCacheData($pCoord);
        throw new PHPExcel_Exception('Cell entry ' . $pCoord . ' no longer exists in APC cache');
      }
    }
    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
   *
   * @access  public
   * @param   string  $pCoord  Coordinate address of the cell to delete
   * @throws  PHPExcel_Exception
   */
  public function deleteCacheData($pCoord) {

    //    Delete the entry from APC
    apc_delete($this->_cachePrefix . $pCoord . '.cache');

    //    Delete the entry from our cell address array
    parent::deleteCacheData($pCoord);
  }

  //    function deleteCacheData()

  /**
   * Clone the cell collection
   *
   * @access  public
   * @param   PHPExcel_Worksheet  $parent  The new worksheet
   * @throws  PHPExcel_Exception
   * @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) {
        $obj = apc_fetch($this->_cachePrefix . $cellID . '.cache');
        if ($obj === FALSE) {

          //    Entry no longer exists in APC, so clear it from the cache array
          parent::deleteCacheData($cellID);
          throw new PHPExcel_Exception('Cell entry ' . $cellID . ' no longer exists in APC');
        }
        if (!apc_store($newCachePrefix . $cellID . '.cache', $obj, $this->_cacheTime)) {
          $this
            ->__destruct();
          throw new PHPExcel_Exception('Failed to store cell ' . $cellID . ' in APC');
        }
      }
    }
    $this->_cachePrefix = $newCachePrefix;
  }

  //    function copyCellCollection()

  /**
   * Clear the cell collection and disconnect from our parent
   *
   * @return  void
   */
  public function unsetWorksheetCells() {
    if ($this->_currentObject !== NULL) {
      $this->_currentObject
        ->detach();
      $this->_currentObject = $this->_currentObjectID = null;
    }

    //    Flush the APC 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) {
    $cacheTime = isset($arguments['cacheTime']) ? $arguments['cacheTime'] : 600;
    if ($this->_cachePrefix === NULL) {
      $baseUnique = $this
        ->_getUniqueID();
      $this->_cachePrefix = substr(md5($baseUnique), 0, 8) . '.';
      $this->_cacheTime = $cacheTime;
      parent::__construct($parent);
    }
  }

  //    function __construct()

  /**
   * Destroy this cell collection
   */
  public function __destruct() {
    $cacheList = $this
      ->getCellList();
    foreach ($cacheList as $cellID) {
      apc_delete($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('apc_store')) {
      return FALSE;
    }
    if (apc_sma_info() === FALSE) {
      return FALSE;
    }
    return TRUE;
  }

}

Classes

Name	Description
PHPExcel_CachedObjectStorage_APC	PHPExcel_CachedObjectStorage_APC