You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
96 lines
2.1 KiB
96 lines
2.1 KiB
<?php |
|
/** |
|
* @copyright Copyright (c) 2016, ownCloud, Inc. |
|
* |
|
* @author Robin Appelman <robin@icewind.nl> |
|
* |
|
* @license AGPL-3.0 |
|
* |
|
* This code is free software: you can redistribute it and/or modify |
|
* it under the terms of the GNU Affero General Public License, version 3, |
|
* as published by the Free Software Foundation. |
|
* |
|
* This program 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 Affero General Public License for more details. |
|
* |
|
* You should have received a copy of the GNU Affero General Public License, version 3, |
|
* along with this program. If not, see <http://www.gnu.org/licenses/> |
|
* |
|
*/ |
|
|
|
namespace OC\Cache; |
|
|
|
use OCP\ICache; |
|
|
|
/** |
|
* In-memory cache with a capacity limit to keep memory usage in check |
|
* |
|
* Uses a simple FIFO expiry mechanism |
|
*/ |
|
class CappedMemoryCache implements ICache, \ArrayAccess { |
|
|
|
private $capacity; |
|
private $cache = []; |
|
|
|
public function __construct($capacity = 512) { |
|
$this->capacity = $capacity; |
|
} |
|
|
|
public function hasKey($key) { |
|
return isset($this->cache[$key]); |
|
} |
|
|
|
public function get($key) { |
|
return isset($this->cache[$key]) ? $this->cache[$key] : null; |
|
} |
|
|
|
public function set($key, $value, $ttl = 0) { |
|
if (is_null($key)) { |
|
$this->cache[] = $value; |
|
} else { |
|
$this->cache[$key] = $value; |
|
} |
|
$this->garbageCollect(); |
|
} |
|
|
|
public function remove($key) { |
|
unset($this->cache[$key]); |
|
return true; |
|
} |
|
|
|
public function clear($prefix = '') { |
|
$this->cache = []; |
|
return true; |
|
} |
|
|
|
public function offsetExists($offset) { |
|
return $this->hasKey($offset); |
|
} |
|
|
|
public function &offsetGet($offset) { |
|
return $this->cache[$offset]; |
|
} |
|
|
|
public function offsetSet($offset, $value) { |
|
$this->set($offset, $value); |
|
} |
|
|
|
public function offsetUnset($offset) { |
|
$this->remove($offset); |
|
} |
|
|
|
public function getData() { |
|
return $this->cache; |
|
} |
|
|
|
|
|
private function garbageCollect() { |
|
while (count($this->cache) > $this->capacity) { |
|
reset($this->cache); |
|
$key = key($this->cache); |
|
$this->remove($key); |
|
} |
|
} |
|
}
|
|
|