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<?php
/*
** 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
{
static $_fetch_func;
static $_store_func;
static function _defaults($p)
{
$p += array(
'ttl' => 2,
'distributed' => false,
'hostsfile' => '/opt/ultra/etc/memcached.hosts',
);
if (!it::is_live())
$p['distributed'] = false; # Always local cache on non-live systems
return $p;
}
/**
* Get value for specific key from cache. Can be mixed value but no objects.
* @param $key Key to get value for
* @param $p['distributed'] Use distributed memcache [false]
* @return Value for given key or null
*/
static function get($key, $p = array())
{
$p = it_cache::_defaults($p);
if ($result = $GLOBALS['it_cache_local'][$key])
; # Use local copy
else if ($p['distributed'] && ($memcache = it_cache::_get_memcache($p)))
$result = @$memcache->get($key);
else
$result = ($func = self::$_fetch_func) ? $func($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['distributed'] Use distributed memcache [false]
* @param $p['ttl'] Time to live for this key/value-pair in seconds
* @return Returns $value
*/
static function put($key, $value, $p = array())
{
$p = it_cache::_defaults($p);
if ($p['distributed'] && ($memcache = it_cache::_get_memcache($p)))
{
$success = @$memcache->set($key, $value, MEMCACHE_COMPRESSED, $p['ttl']);
}
else
{
function_exists("eaccelerator_gc") && eaccelerator_gc();
$success = ($func = self::$_store_func) ? $func($key, $value, $p['ttl']) : null;
}
if (!$success)
it::error(array('title' => ($p['distributed'] ? "memcache" : self::$_store_func) . " in it_cache::put failed for key '$key'", 'id' => "it_cache_put", 'graceperiod' => 60, 'timewindow' => 10));
$GLOBALS['it_cache_local'][$key] = $value; # Also store local copy
return $value;
}
static function _get_memcache($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));
$GLOBALS[$memcache_id] = $reachable ? $memcache : false;
}
return $GLOBALS[$memcache_id];
}
}
it_cache::$_fetch_func = function_exists("apcu_fetch") ? "apcu_fetch" : (function_exists("apc_fetch") ? "apc_fetch" : (function_exists("eaccelerator_get") ? "eaccelerator_get" : null));
it_cache::$_store_func = function_exists("apcu_store") ? "apcu_store" : (function_exists("apc_store") ? "apc_store" : (function_exists("eaccelerator_put") ? "eaccelerator_put" : null));
?>
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