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;


        private function _storeData() {
                $this->_currentObject->detach();

                if (!apc_store($this->_cachePrefix.$this->_currentObjectID.'.cache',serialize($this->_currentObject),$this->_cacheTime)) {
                        $this->__destruct();
                        throw new Exception('Failed to store cell '.$cellID.' in APC');
                }
                $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;

                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($pCoord);
                                throw new Exception('Cell entry '.$cellID.' no longer exists in APC');
                        }
                        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($pCoord);
                                throw new Exception('Cell entry '.$cellID.' no longer exists in APC');
                        }
                } 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 the parent worksheet
                $this->_currentObject->attach($this->_parent);

                //      Return requested entry
                return $this->_currentObject;
        }       //      function getCacheData()


        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($cellID);
                                        throw new Exception('Cell entry '.$cellID.' no longer exists in APC');
                                }
                                if (!apc_store($newCachePrefix.$cellID.'.cache',$obj,$this->_cacheTime)) {
                                        $this->__destruct();
                                        throw new Exception('Failed to store cell '.$cellID.' in APC');
                                }
                        }
                }
                $this->_cachePrefix = $newCachePrefix;
        }       //      function copyCellCollection()


        public function unsetWorksheetCells() {
                if(!is_null($this->_currentObject)) {
                        $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 (is_null($this->_cachePrefix)) {
                        $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()

}