Viewing file:  CacheStorageFile.php (2.94 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 CacheStorageFile extends CacheStorage {
private $prefix = null;
public function __construct($name) {
$this->prefix = $name;
}
public function store($key, $value) {
$cacheDir = CacheStorageFile::getCacheDir($key);
$cacheFile = CacheStorageFile::getCacheFile($key);
if (! is_dir($cacheDir)) {
if (! @mkdir($cacheDir, 0755, true)) {
throw new CacheException("Could not create cache directory");
}
}
return file_put_contents($cacheFile, $value);
}
public function fetch($key) {
$cacheFile = CacheStorageFile::getCacheFile($key);
if (File::exists($cacheFile) && File::readable($cacheFile)) {
return @file_get_contents($cacheFile);
}
return false;
}
public function delete($key) {
$cacheFile = CacheStorageFile::getCacheFile($key);
if (! @unlink($cacheFile)) {
throw new CacheException("Cache file could not be deleted");
}
}
public function isLocked($key) {
// our lock file convention is simple: /the/file/path.lock
clearstatcache();
return file_exists($key . '.lock');
}
public function lock($key) {
$cacheDir = CacheStorageFile::getCacheDir($key);
$cacheFile = CacheStorageFile::getCacheFile($key);
if (! is_dir($cacheDir)) {
if (! @mkdir($cacheDir, 0755, true)) {
// make sure the failure isn't because of a concurency issue
if (! is_dir($cacheDir)) {
throw new CacheException("Could not create cache directory ".$cacheDir);
}
}
}
@touch($cacheFile . '.lock');
}
public function unlock($key) {
// suppress all warnings, if some other process removed it that's ok too
$cacheFile = CacheStorageFile::getCacheFile($key);
@unlink($cacheFile . '.lock');
}
private function getCacheDir($key) {
// use the first 2 characters of the hash as a directory prefix
// this should prevent slowdowns due to huge directory listings
// and thus give some basic amount of scalability
return Config::get('cache_root') . '/' . $this->prefix . '/' .
substr($key, 0, 2);
}
private function getCacheFile($key) {
return $this->getCacheDir($key) . '/' . $key;
}
}
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