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