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General: Reduce cell caching overhead using dirty flag to ensure that cells are only rewritten to the cache if they have actually been changed

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git-svn-id: https://phpexcel.svn.codeplex.com/svn/trunk@72227 2327b42d-5241-43d6-9e2a-de5ac946f064
This commit is contained in:
Mark Baker
2011-04-25 14:25:53 +00:00
parent ff4daef39c
commit 5672f25ebf
9 changed files with 76 additions and 39 deletions
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Classes/PHPExcel/CachedObjectStorage/DiscISAM.php
+11 -7
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@@ -40,14 +40,17 @@ class PHPExcel_CachedObjectStorage_DiscISAM extends PHPExcel_CachedObjectStorage
private function _storeData() {
$this->_currentObject->detach();
if ($this->_currentCellIsDirty) {
$this->_currentObject->detach();
fseek($this->_fileHandle,0,SEEK_END);
$offset = ftell($this->_fileHandle);
fwrite($this->_fileHandle, serialize($this->_currentObject));
$this->_cellCache[$this->_currentObjectID] = array('ptr' => $offset,
'sz' => ftell($this->_fileHandle) - $offset
);
fseek($this->_fileHandle,0,SEEK_END);
$offset = ftell($this->_fileHandle);
fwrite($this->_fileHandle, serialize($this->_currentObject));
$this->_cellCache[$this->_currentObjectID] = array('ptr' => $offset,
'sz' => ftell($this->_fileHandle) - $offset
);
$this->_currentCellIsDirty = false;
}
$this->_currentObjectID = $this->_currentObject = null;
} // function _storeData()
@@ -67,6 +70,7 @@ class PHPExcel_CachedObjectStorage_DiscISAM extends PHPExcel_CachedObjectStorage
$this->_currentObjectID = $pCoord;
$this->_currentObject = $cell;
$this->_currentCellIsDirty = true;
return $cell;
} // function addCacheData()