friendica/src/Core/Cache.php

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<?php
/**
* @file src/Core/Cache.php
*/
namespace Friendica\Core;
use Friendica\Core\Cache;
use Friendica\Core\Config;
/**
* @brief Class for storing data for a short time
*/
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class Cache extends \Friendica\BaseObject
{
const MONTH = 2592000;
const WEEK = 604800;
const DAY = 86400;
const HOUR = 3600;
const HALF_HOUR = 1800;
const QUARTER_HOUR = 900;
const FIVE_MINUTES = 300;
const MINUTE = 60;
/**
* @var Cache\ICacheDriver
*/
static $driver = null;
public static function init()
{
switch(Config::get('system', 'cache_driver', 'database')) {
case 'memcache':
$memcache_host = Config::get('system', 'memcache_host', '127.0.0.1');
$memcache_port = Config::get('system', 'memcache_port', 11211);
self::$driver = new Cache\MemcacheCacheDriver($memcache_host, $memcache_port);
break;
case 'memcached':
$memcached_hosts = Config::get('system', 'memcached_hosts', [['127.0.0.1', 11211]]);
self::$driver = new Cache\MemcachedCacheDriver($memcached_hosts);
break;
default:
self::$driver = new Cache\DatabaseCacheDriver();
}
}
/**
* Returns the current cache driver
*
* @return Cache\ICacheDriver
*/
private static function getDriver()
{
if (self::$driver === null) {
self::init();
}
return self::$driver;
}
/**
* @brief Fetch cached data according to the key
*
* @param string $key The key to the cached data
*
* @return mixed Cached $value or "null" if not found
*/
public static function get($key)
{
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$time = microtime(true);
$return = self::getDriver()->get($key);
self::getApp()->save_timestamp($time, 'cache');
return $return;
}
/**
* @brief Put data in the cache according to the key
*
* The input $value can have multiple formats.
*
* @param string $key The key to the cached data
* @param mixed $value The value that is about to be stored
* @param integer $duration The cache lifespan
*
* @return bool
*/
public static function set($key, $value, $duration = self::MONTH)
{
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$time = microtime(true);
$return = self::getDriver()->set($key, $value, $duration);
self::getApp()->save_timestamp($time, 'cache_write');
return $return;
}
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/**
* @brief Delete a value from the cache
*
* @param string $key The key to the cached data
*
* @return bool
*/
public static function delete($key)
{
$time = microtime(true);
$return = self::getDriver()->delete($key);
self::getApp()->save_timestamp($time, 'cache_write');
return $return;
}
/**
* @brief Remove outdated data from the cache
*
* @param integer $max_level The maximum cache level that is to be cleared
*
* @return void
*/
public static function clear()
{
return self::getDriver()->clear();
}
}