memory cache

1 files changed, 98 insertions, 0 deletions

diff --git a/it_cache.class b/it_cache.class
new file mode 100644
index 0000000..551d103
--- /dev/null
+++ b/it_cache.class
@@ -0,0 +1,98 @@
+<?php
+/*
+**	$Id$
+**
+**	Copyright (C) 1995-2008 by the ITools Authors.
+**	This file is part of ITools - the Internet Tools Library
+**
+**	ITools is free software; you can redistribute it and/or modify
+**	it under the terms of the GNU General Public License as published by
+**	the Free Software Foundation; either version 3 of the License, or
+**	(at your option) any later version.
+**
+**	ITools is distributed in the hope that it will be useful,
+**	but WITHOUT ANY WARRANTY; without even the implied warranty of
+**	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+**	GNU General Public License for more details.
+**
+**	You should have received a copy of the GNU General Public License
+**	along with this program.  If not, see <http://www.gnu.org/licenses/>.
+**
+**	it_cache.class - Caching functions
+*/
+
+class it_cache
+{
+
+function _defaults($p)
+{
+	$p += array(
+		'ttl' => 2,
+		'distributed' => false,
+		'hostsfile' => '/opt/ultra/etc/memcached.hosts',
+	);
+
+	return $p;
+}
+
+/**
+ * Get value for specific key from cache. Can be mixed value but no objects.
+ * @param $key Key to get value for
+ * @return Value for given key or null
+ */
+function get($key, $p = array())
+{
+	$p = it_cache::_defaults($p);
+
+	if ($p['distributed'] && ($memcache = it_cache::_get_memcache($p)))
+		$result = @$memcache->get($key);
+	else
+		$result = function_exists("eaccelerator_get") ? eaccelerator_get($key) : null;
+
+	return $result;
+}
+
+/**
+ * Put value for specific key into cache. Can be mixed value but no objects.
+ * @param $key Key to put value with
+ * @param $value Value to put (mixed but no objects allowed)
+ * @param $p['ttl'] Time to live for this key/value-pair
+ * @return Boolean if value was put into cache
+ */
+function put($key, $value, $p = array())
+{
+	$p = it_cache::_defaults($p);
+
+	if ($p['distributed'] && ($memcache = it_cache::_get_memcache($p)))
+	{
+		@$memcache->set($key, $value, 0, $p['ttl']);
+	}
+	else
+	{
+		function_exists("eaccelerator_gc") && eaccelerator_gc();
+		$result = function_exists("eaccelerator_put") ? eaccelerator_put($key, $value, $p['ttl']) : null;
+	}
+
+	return $result;
+}
+
+function _get_memcache($p)
+{
+	$memcache_id = "it_cache_memcache_" . $p['hostsfile'];
+
+	if (!isset($GLOBALS[$memcache_id]) && class_exists("Memcache", false))
+	{
+		$memcache = new Memcache;
+
+		foreach (array_filter(it::replace(array('[#\s].*' => ""), file($p['hostsfile']))) as $host)
+			$reachable += intval(@$memcache->addServer($host, 11211, true, 1, 1, -1));
+
+		$GLOBALS[$memcache_id] = $reachable ? $memcache : false;
+	}
+
+	return $GLOBALS[$memcache_id];
+}
+
+}
+
+?>