From d81f562b712f2387fa02290bf2ca86392ab356f2 Mon Sep 17 00:00:00 2001
From: Pierre Schmitz <pierre@archlinux.de>
Date: Wed, 11 Oct 2006 20:21:25 +0000
Subject: Aktualisierung auf Version 1.8.1

---
 includes/BagOStuff.php | 149 +++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 145 insertions(+), 4 deletions(-)

(limited to 'includes/BagOStuff.php')

diff --git a/includes/BagOStuff.php b/includes/BagOStuff.php
index 182756ab..1dc93a2f 100644
--- a/includes/BagOStuff.php
+++ b/includes/BagOStuff.php
@@ -146,6 +146,17 @@ class BagOStuff {
 		if($this->debugmode)
 			wfDebug("BagOStuff debug: $text\n");
 	}
+
+	/**
+	 * Convert an optionally relative time to an absolute time
+	 */
+	static function convertExpiry( $exptime ) {
+		if(($exptime != 0) && ($exptime < 3600*24*30)) {
+			return time() + $exptime;
+		} else {
+			return $exptime;
+		}
+	}
 }
 
 
@@ -183,9 +194,7 @@ class HashBagOStuff extends BagOStuff {
 	}
 
 	function set($key,$value,$exptime=0) {
-		if(($exptime != 0) && ($exptime < 3600*24*30))
-			$exptime = time() + $exptime;
-		$this->bag[$key] = array( $value, $exptime );
+		$this->bag[$key] = array( $value, BagOStuff::convertExpiry( $exptime ) );
 	}
 
 	function delete($key,$time=0) {
@@ -491,7 +500,7 @@ class APCBagOStuff extends BagOStuff {
 		return true;
 	}
 	
-	function delete($key) {
+	function delete($key, $time=0) {
 		apc_delete($key);
 		return true;
 	}
@@ -535,4 +544,136 @@ class eAccelBagOStuff extends BagOStuff {
 		return true;
 	}
 }
+
+class DBABagOStuff extends BagOStuff {
+	var $mHandler, $mFile, $mReader, $mWriter, $mDisabled;
+	
+	function __construct( $handler = 'db3', $dir = false ) {
+		if ( $dir === false ) {
+			global $wgTmpDirectory;
+			$dir = $wgTmpDirectory;
+		}
+		$this->mFile = "$dir/mw-cache-" . wfWikiID();
+		$this->mFile .= '.db';
+		$this->mHandler = $handler;
+	}
+
+	/**
+	 * Encode value and expiry for storage
+	 */
+	function encode( $value, $expiry ) {
+		# Convert to absolute time
+		$expiry = BagOStuff::convertExpiry( $expiry );
+		return sprintf( '%010u', intval( $expiry ) ) . ' ' . serialize( $value );
+	}
+
+	/**
+	 * @return list containing value first and expiry second
+	 */
+	function decode( $blob ) {
+		if ( !is_string( $blob ) ) {
+			return array( null, 0 );
+		} else {
+			return array( 
+				unserialize( substr( $blob, 11 ) ),
+				intval( substr( $blob, 0, 10 ) )
+		   	);
+		}
+	}
+
+	function getReader() {
+		if ( file_exists( $this->mFile ) ) {
+			$handle = dba_open( $this->mFile, 'rl', $this->mHandler );
+		} else {
+			$handle = $this->getWriter();
+		}
+		if ( !$handle ) {
+			wfDebug( "Unable to open DBA cache file {$this->mFile}\n" );
+		}
+		return $handle;
+	}
+
+	function getWriter() {
+		$handle = dba_open( $this->mFile, 'cl', $this->mHandler );
+		if ( !$handle ) {
+			wfDebug( "Unable to open DBA cache file {$this->mFile}\n" );
+		}
+		return $handle;
+	}
+
+	function get( $key ) {
+		wfProfileIn( __METHOD__ );
+		wfDebug( __METHOD__."($key)\n" );
+		$handle = $this->getReader();
+		if ( !$handle ) {
+			return null;
+		}
+		$val = dba_fetch( $key, $handle );
+		list( $val, $expiry ) = $this->decode( $val );
+		# Must close ASAP because locks are held
+		dba_close( $handle );
+
+		if ( !is_null( $val ) && $expiry && $expiry < time() ) {
+			# Key is expired, delete it
+			$handle = $this->getWriter();
+			dba_delete( $key, $handle );
+			dba_close( $handle );
+			wfDebug( __METHOD__.": $key expired\n" );
+			$val = null;
+		}
+		wfProfileOut( __METHOD__ );
+		return $val;
+	}
+
+	function set( $key, $value, $exptime=0 ) {
+		wfProfileIn( __METHOD__ );
+		wfDebug( __METHOD__."($key)\n" );
+		$blob = $this->encode( $value, $exptime );
+		$handle = $this->getWriter();
+		if ( !$handle ) {
+			return false;
+		}
+		$ret = dba_replace( $key, $blob, $handle );
+		dba_close( $handle );
+		wfProfileOut( __METHOD__ );
+		return $ret;
+	}
+
+	function delete( $key, $time = 0 ) {
+		wfProfileIn( __METHOD__ );
+		$handle = $this->getWriter();
+		if ( !$handle ) {
+			return false;
+		}
+		$ret = dba_delete( $key, $handle );
+		dba_close( $handle );
+		wfProfileOut( __METHOD__ );
+		return $ret;
+	}
+
+	function add( $key, $value, $exptime = 0 ) {
+		wfProfileIn( __METHOD__ );
+		$blob = $this->encode( $value, $exptime );
+		$handle = $this->getWriter();
+		if ( !$handle ) {
+			return false;
+		}
+		$ret = dba_insert( $key, $blob, $handle );
+		# Insert failed, check to see if it failed due to an expired key
+		if ( !$ret ) {
+			list( $value, $expiry ) = $this->decode( dba_fetch( $key, $handle ) );
+			if ( $expiry < time() ) {
+				# Yes expired, delete and try again
+				dba_delete( $key, $handle );
+				$ret = dba_insert( $key, $blob, $handle );
+				# This time if it failed then it will be handled by the caller like any other race
+			}
+		}
+
+		dba_close( $handle );
+		wfProfileOut( __METHOD__ );
+		return $ret;
+	}
+}
+	
 ?>
-- 
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