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efrain |
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<?php
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/*
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pCache - Faster renderding using data cache
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Copyright (C) 2008 Jean-Damien POGOLOTTI
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Version 1.1.2 last updated on 06/17/08
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http://pchart.sourceforge.net
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 1,2,3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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Class initialisation :
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pCache($CacheFolder="Cache/")
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Cache management :
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IsInCache($Data)
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GetFromCache($ID,$Data)
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WriteToCache($ID,$Data,$Picture)
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DeleteFromCache($ID,$Data)
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ClearCache()
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Inner functions :
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GetHash($ID,$Data)
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*/
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/* pCache class definition */
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class pCache
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{
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var $HashKey = "";
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var $CacheFolder = "Cache/";
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/* Create the pCache object */
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function pCache($CacheFolder="Cache/")
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{
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$this->CacheFolder = $CacheFolder;
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}
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/* This function is clearing the cache folder */
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function ClearCache()
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{
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if ($handle = opendir($this->CacheFolder))
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{
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while (false !== ($file = readdir($handle)))
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{
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if ( $file != "." && $file != ".." )
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unlink($this->CacheFolder.$file);
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}
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closedir($handle);
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}
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}
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/* This function is checking if we have an offline version of this chart */
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function IsInCache($ID,$Data,$Hash="")
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{
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if ( $Hash == "" )
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$Hash = $this->GetHash($ID,$Data);
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if ( file_exists($this->CacheFolder.$Hash) )
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return(TRUE);
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else
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return(FALSE);
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}
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/* This function is making a copy of drawn chart in the cache folder */
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function WriteToCache($ID,$Data,$Picture)
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{
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$Hash = $this->GetHash($ID,$Data);
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$FileName = $this->CacheFolder.$Hash;
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imagepng($Picture->Picture,$FileName);
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}
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/* This function is removing any cached copy of this chart */
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function DeleteFromCache($ID,$Data)
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{
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$Hash = $this->GetHash($ID,$Data);
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$FileName = $this->CacheFolder.$Hash;
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if ( file_exists($FileName ) )
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unlink($FileName);
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}
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/* This function is retrieving the cached picture if applicable */
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function GetFromCache($ID,$Data)
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{
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$Hash = $this->GetHash($ID,$Data);
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if ( $this->IsInCache("","",$Hash ) )
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{
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$FileName = $this->CacheFolder.$Hash;
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header('Content-type: image/png');
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@readfile($FileName);
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exit();
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}
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}
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/* This function is building the graph unique hash key */
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function GetHash($ID,$Data)
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{
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$mKey = "$ID";
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foreach($Data as $key => $Values)
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{
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$tKey = "";
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foreach($Values as $Serie => $Value)
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$tKey = $tKey.$Serie.$Value;
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$mKey = $mKey.md5($tKey);
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}
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return(md5($mKey));
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}
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}
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?>
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