From e39771330fe23f73012d528e2ef7de8f6424357c Mon Sep 17 00:00:00 2001
From: Georg Hopp <georg@steffers.org>
Date: Mon, 15 Oct 2007 15:22:49 +0000
Subject: [PATCH] cache eingebaut

---
 components/personAdmin.php |  17 +++++-
 libs/c_cache.php           | 118 +++++++++++++++++++++++++++++++++++++
 2 files changed, 134 insertions(+), 1 deletion(-)
 create mode 100644 libs/c_cache.php

diff --git a/components/personAdmin.php b/components/personAdmin.php
index e976317..fbc41dd 100644
--- a/components/personAdmin.php
+++ b/components/personAdmin.php
@@ -3,10 +3,25 @@
 require_once dirname(__FILE__) . '/../config.php';
 require_once LIBDIR . 'initLocale.php';
 require_once LIBDIR . 'c_personAdmin.php';
+require_once LIBDIR . 'c_cache.php';
 
+$cache       = new c_cache (array ('a', 'b'));
 $personAdmin = new c_personAdmin ($locale);
 
 ob_start ('ob_gzhandler');
-$personAdmin->show ();
+
+if (! $cache->check (60))
+{
+	sleep (10);
+	$personAdmin->show ();
+
+	$cache->update ();
+}
+else
+{
+	print "<p>[kein update]<p>";
+}
+
+ob_flush ();
 
 ?>
diff --git a/libs/c_cache.php b/libs/c_cache.php
new file mode 100644
index 0000000..17dcb96
--- /dev/null
+++ b/libs/c_cache.php
@@ -0,0 +1,118 @@
+<?php
+
+require_once LIBDIR . 'mutualExclusion.php';
+
+class c_cache
+{
+	private $lock;
+	private $cacheFile;
+
+	// generiere den Cache Filename aus dem
+	// 1. script Namen
+	// 2. einem Hash ueber alle verwendeten:
+	//  - request parameter
+	//  - Werte in GLOBALS
+	//  - Sessionvariablen
+	// ausserdem wird das cache Verzeichnis auch gleich angelegt wenn es noch
+	// nicht existiert.
+	function __construct ($params=NULL, $globals=NULL, $session=NULL)
+	{
+		$cacheDir     = CACHEDIR . substr ($_SERVER['PHP_SELF'], 1);
+		$cacheDirArr  = explode ('/', $cacheDir);
+		$cacheParms   = array ();
+		$cacheGlobals = array ();
+		$cacheSession = array ();
+		$cachaAllParm = array ();
+		$parmStr      = '';
+
+		// cache Verzeichnis anlegen.
+		$_dir = '';
+		foreach ($cacheDirArr as $dir)
+			if (! is_dir ($_dir .= '/' . $dir) && $_dir !== '')
+				mkdir ($_dir, 0755);
+
+		unset ($_dir, $dir, $cacheDirArr);
+
+		// alle verwendeten req parameter holen
+		if ($params !== NULL)
+			foreach ($params as $parm)
+				if (isset ($_REQUEST[$parm]))
+					$cacheParms[$parm] = $_REQUEST[$parm];
+				else
+					$cacheParms[$parm] = '';
+		ksort ($cacheParms);
+
+		// alle verwendeten globals holen
+		if ($globals !== NULL)
+			foreach ($globals as $glob)
+				if (isset ($GLOBALS[$glob]))
+					$cacheGlobals[$glob] = $GLOBALS[$glob];
+				else
+					$cacheGlobals[$glob] = '';
+		ksort ($cacheGlobals);
+
+		// alle verwendeten session variablen holen
+		if ($session !== NULL)
+			foreach ($session as $sess)
+				if (isset ($SESSION[$sess]))
+					$cacheSession[$sess] = $SESSION[$sess];
+				else
+					$cacheSession[$sess] = '';
+		ksort ($cacheSession);
+
+		// und nu aus all denen einen md5 hash generieren.
+		$cacheAllParm = array_merge ($cacheParms, $cacheGlobals, $cacheSession);
+
+		unset ($cacheParms, $cacheGlobals, $cacheSession);
+
+		foreach ($cacheAllParm as $name => $value)
+			$parmStr .= '_' . $name . '=' . $value;
+
+		$parmStr = md5 ($parmStr);
+
+		$this->lock = NULL;
+		$this->cacheFile = $cacheDir . '/cache_' . $parmStr . '.html';
+	}
+
+
+
+	function check ($interval=0)
+	{
+		ob_start ();
+
+		clearstatcache ();
+		if (file_exists ($this->cacheFile) &&
+				time () - filemtime ($this->cacheFile) < $interval)
+		{
+			readfile ($this->cacheFile);
+			return TRUE;
+		}
+		else
+		{
+			$this->lock = acquireLock ($this->cacheFile, '1');
+
+			// inszwischen koennte der cache von einem anderen aufruf
+			// aktualisiert worden sein, also nochmal checken.
+			clearstatcache ();
+			if (file_exists ($this->cacheFile) &&
+				time () - filemtime ($this->cacheFile) < $interval)
+			{
+				releaseLock ($this->lock);
+				readfile ($this->cacheFile);
+				return TRUE;
+			}
+
+			return FALSE;
+		}
+	}
+
+	function update ()
+	{
+		$page = ob_get_flush ();
+		file_put_contents ($this->cacheFile, $page);
+
+		releaseLock ($this->lock);
+	}
+};
+
+?>