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<?php
/**
* Copyright (c) 2012 Robin Appelman <icewind@owncloud.com>
* This file is licensed under the Affero General Public License version 3 or
* later.
* See the COPYING-README file.
*/
namespace OC\Files\Cache;
/**
* check the storage backends for updates and change the cache accordingly
*/
class Watcher {
const CHECK_NEVER = 0; // never check the underlying filesystem for updates
const CHECK_ONCE = 1; // check the underlying filesystem for updates once every request for each file
const CHECK_ALWAYS = 2; // always check the underlying filesystem for updates
protected $watchPolicy = self::CHECK_ONCE;
protected $checkedPaths = array();
/**
* @var \OC\Files\Storage\Storage $storage
*/
protected $storage;
/**
* @var Cache $cache
*/
protected $cache;
/**
* @var Scanner $scanner ;
*/
protected $scanner;
/**
* @param \OC\Files\Storage\Storage $storage
*/
public function __construct(\OC\Files\Storage\Storage $storage) {
$this->storage = $storage;
$this->cache = $storage->getCache();
$this->scanner = $storage->getScanner();
}
/**
* @param int $policy either \OC\Files\Cache\Watcher::UPDATE_NEVER, \OC\Files\Cache\Watcher::UPDATE_ONCE, \OC\Files\Cache\Watcher::UPDATE_ALWAYS
*/
public function setPolicy($policy) {
$this->watchPolicy = $policy;
}
/**
* check $path for updates
*
* @param string $path
* @return boolean|array true if path was updated, otherwise the cached data is returned
*/
public function checkUpdate($path) {
if ($this->watchPolicy === self::CHECK_ALWAYS or ($this->watchPolicy === self::CHECK_ONCE and array_search($path, $this->checkedPaths) === false)) {
$cachedEntry = $this->cache->get($path);
$this->checkedPaths[] = $path;
if ($this->storage->hasUpdated($path, $cachedEntry['storage_mtime'])) {
if ($this->storage->is_dir($path)) {
$this->scanner->scan($path, Scanner::SCAN_SHALLOW);
} else {
$this->scanner->scanFile($path);
}
if ($cachedEntry['mimetype'] === 'httpd/unix-directory') {
$this->cleanFolder($path);
}
$this->cache->correctFolderSize($path);
return true;
}
return $cachedEntry;
} else {
return false;
}
}
/**
* remove deleted files in $path from the cache
*
* @param string $path
*/
public function cleanFolder($path) {
$cachedContent = $this->cache->getFolderContents($path);
foreach ($cachedContent as $entry) {
if (!$this->storage->file_exists($entry['path'])) {
$this->cache->remove($entry['path']);
}
}
}
}
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