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This is an helpful helper that should be used in more place than just server and this is already the case with groupfodlers, deck, user_oidc and more using it, so let's make it public Signed-off-by: Carl Schwan <carl@carlschwan.eu>
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<?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 OCP\Cache; | ||
|
||
use OCP\ICache; | ||
|
||
/** | ||
* In-memory cache with a capacity limit to keep memory usage in check | ||
* | ||
* Uses a simple FIFO expiry mechanism | ||
* | ||
* @since 25.0.0 | ||
* @template T | ||
*/ | ||
class CappedMemoryCache implements ICache, \ArrayAccess { | ||
private int $capacity; | ||
/** @var T[] */ | ||
private $cache = []; | ||
|
||
/** | ||
* @inheritdoc | ||
* @since 25.0.0 | ||
*/ | ||
public function __construct(int $capacity = 512) { | ||
$this->capacity = $capacity; | ||
} | ||
|
||
/** | ||
* @inheritdoc | ||
* @since 25.0.0 | ||
*/ | ||
public function hasKey($key): bool { | ||
return isset($this->cache[$key]); | ||
} | ||
|
||
/** | ||
* @return ?T | ||
* @since 25.0.0 | ||
*/ | ||
public function get($key) { | ||
return $this->cache[$key] ?? null; | ||
} | ||
|
||
/** | ||
* @inheritdoc | ||
* @param string $key | ||
* @param T $value | ||
* @param int $ttl | ||
* @since 25.0.0 | ||
* @return bool | ||
*/ | ||
public function set($key, $value, $ttl = 0): bool { | ||
if (is_null($key)) { | ||
$this->cache[] = $value; | ||
} else { | ||
$this->cache[$key] = $value; | ||
} | ||
$this->garbageCollect(); | ||
return true; | ||
} | ||
|
||
/** | ||
* @since 25.0.0 | ||
*/ | ||
public function remove($key) { | ||
unset($this->cache[$key]); | ||
return true; | ||
} | ||
|
||
/** | ||
* @inheritdoc | ||
* @since 25.0.0 | ||
*/ | ||
public function clear($prefix = '') { | ||
$this->cache = []; | ||
return true; | ||
} | ||
|
||
/** | ||
* @since 25.0.0 | ||
*/ | ||
public function offsetExists($offset): bool { | ||
return $this->hasKey($offset); | ||
} | ||
|
||
/** | ||
* @inheritdoc | ||
* @return T | ||
* @since 25.0.0 | ||
*/ | ||
#[\ReturnTypeWillChange] | ||
public function &offsetGet($offset) { | ||
return $this->cache[$offset]; | ||
} | ||
|
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/** | ||
* @inheritdoc | ||
* @param string $offset | ||
* @param T $value | ||
* @since 25.0.0 | ||
*/ | ||
public function offsetSet($offset, $value): void { | ||
$this->set($offset, $value); | ||
} | ||
|
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/** | ||
* @inheritdoc | ||
* @since 25.0.0 | ||
*/ | ||
public function offsetUnset($offset): void { | ||
$this->remove($offset); | ||
} | ||
|
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/** | ||
* @return T[] | ||
* @since 25.0.0 | ||
*/ | ||
public function getData() { | ||
return $this->cache; | ||
} | ||
|
||
|
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private function garbageCollect() { | ||
while (count($this->cache) > $this->capacity) { | ||
reset($this->cache); | ||
$key = key($this->cache); | ||
$this->remove($key); | ||
} | ||
} | ||
|
||
/** | ||
* @inheritdoc | ||
* @since 25.0.0 | ||
*/ | ||
public static function isAvailable(): bool { | ||
return true; | ||
} | ||
} |