APC.php

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<?php
class PHPExcel_CachedObjectStorage_APC extends PHPExcel_CachedObjectStorage_CacheBase implements PHPExcel_CachedObjectStorage_ICache {
 
    private $_cachePrefix = null;
 
    private $_cacheTime = 600;
 
 
    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()
 
 
    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()
 
 
    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()
 
 
    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()
 
 
        public function getCellList() {
                if ($this->_currentObjectID !== null) {
                        $this->_storeData();
                }
 
                return parent::getCellList();
        }
 
 
    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()
 
 
    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()
 
 
    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()
 
 
    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()
 
 
    public function __destruct() {
        $cacheList = $this->getCellList();
        foreach($cacheList as $cellID) {
            apc_delete($this->_cachePrefix.$cellID.'.cache');
        }
    }    //    function __destruct()
 
 
    public static function cacheMethodIsAvailable() {
        if (!function_exists('apc_store')) {
            return FALSE;
        }
        if (apc_sma_info() === FALSE) {
            return FALSE;
        }
 
        return TRUE;
    }
 
}