Viewing file:  Cache.php (3.46 KB) -rwxr-xr-x
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<?php
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
class CacheException extends Exception {
}
class RequestTime {
public function getRequestTime() {
return $_SERVER['REQUEST_TIME'];
}
}
class Cache {
/**
* @var RequestTime
*/
private $time = null;
/**
* @var CacheStorage
*/
private $storage = null;
/**
* @return Cache
*/
static public function createCache($cacheClass, $name, RequestTime $time = null) {
return new Cache($cacheClass, $name, $time);
}
private function __construct($cacheClass, $name, RequestTime $time = null) {
$this->storage = new $cacheClass($name);
if ($time == null) {
$this->time = new RequestTime();
} else {
$this->time = $time;
}
}
public function get($key) {
if ($this->storage->isLocked($key)) {
$this->storage->waitForLock($key);
}
$data = $this->storage->fetch($key);
if ($data) {
$data = unserialize($data);
if ($data['valid'] && ($this->time->getRequestTime() - $data['time']) < $data['ttl']) {
return $data['data'];
}
}
return false;
}
public function expiredGet($key) {
if ($this->storage->isLocked($key)) {
$this->storage->waitForLock($key);
}
$data = $this->storage->fetch($key);
if ($data) {
$data = unserialize($data);
return array_merge(array('found' => true), $data);
}
return array('found' => false);
}
public function set($key, $value, $ttl = false) {
if (! $ttl) {
$ttl = Config::Get('cache_time');
}
if ($this->storage->isLocked($key)) {
$this->storage->waitForLock($key);
}
$data = serialize(array('time' => $this->time->getRequestTime(), 'ttl' => $ttl, 'valid' => true, 'data' => $value));
$this->storage->lock($key);
try {
$this->storage->store($key, $data);
$this->storage->unlock($key);
} catch (Exception $e) {
$this->storage->unlock($key);
throw $e;
}
}
public function delete($key) {
if ($this->storage->isLocked($key)) {
$this->storage->waitForLock($key);
}
$this->storage->lock($key);
$this->storage->delete($key);
$this->storage->unlock($key);
}
public function invalidate($key) {
if ($this->storage->isLocked($key)) {
$this->storage->waitForLock($key);
}
$this->storage->lock($key);
try {
$data = $this->storage->fetch($key);
if ($data) {
$data = unserialize($data);
$data = serialize(array('time' => $data['time'], 'ttl' => $data['ttl'], 'valid' => false, 'data' => $data['data']));
$this->storage->store($key, $data);
}
$this->storage->unlock($key);
} catch (Exception $e) {
$this->storage->unlock($key);
throw $e;
}
}
}
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