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<?php
/**
* @author Robin Appelman <icewind@owncloud.com>>
*
* @copyright Copyright (c) 2015, ownCloud, Inc.
* @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\Files\Cache;
/**
* Metadata cache for a storage
*
* The cache stores the metadata for all files and folders in a storage and is kept up to date trough the following mechanisms:
*
* - Scanner: scans the storage and updates the cache where needed
* - Watcher: checks for changes made to the filesystem outside of the ownCloud instance and rescans files and folder when a change is detected
* - Updater: listens to changes made to the filesystem inside of the ownCloud instance and updates the cache where needed
* - ChangePropagator: updates the mtime and etags of parent folders whenever a change to the cache is made to the cache by the updater
*
* @since 9.0.0
*/
interface ICache {
const NOT_FOUND = 0;
const PARTIAL = 1; //only partial data available, file not cached in the database
const SHALLOW = 2; //folder in cache, but not all child files are completely scanned
const COMPLETE = 3;
/**
* Get the numeric storage id for this cache's storage
*
* @return int
* @since 9.0.0
*/
public function getNumericStorageId();
/**
* get the stored metadata of a file or folder
*
* @param string | int $file either the path of a file or folder or the file id for a file or folder
* @return ICacheEntry|false the cache entry or false if the file is not found in the cache
* @since 9.0.0
*/
public function get($file);
/**
* get the metadata of all files stored in $folder
*
* @param string $folder
* @return ICacheEntry[]
* @since 9.0.0
*/
public function getFolderContents($folder);
/**
* get the metadata of all files stored in $folder
*
* @param int $fileId the file id of the folder
* @return ICacheEntry[]
* @since 9.0.0
*/
public function getFolderContentsById($fileId);
/**
* store meta data for a file or folder
*
* @param string $file
* @param array $data
*
* @return int file id
* @throws \RuntimeException
* @since 9.0.0
*/
public function put($file, array $data);
/**
* update the metadata of an existing file or folder in the cache
*
* @param int $id the fileid of the existing file or folder
* @param array $data [$key => $value] the metadata to update, only the fields provided in the array will be updated, non-provided values will remain unchanged
* @since 9.0.0
*/
public function update($id, array $data);
/**
* get the file id for a file
*
* A file id is a numeric id for a file or folder that's unique within an owncloud instance which stays the same for the lifetime of a file
*
* File ids are easiest way for apps to store references to a file since unlike paths they are not affected by renames or sharing
*
* @param string $file
* @return int
* @since 9.0.0
*/
public function getId($file);
/**
* get the id of the parent folder of a file
*
* @param string $file
* @return int
* @since 9.0.0
*/
public function getParentId($file);
/**
* check if a file is available in the cache
*
* @param string $file
* @return bool
* @since 9.0.0
*/
public function inCache($file);
/**
* remove a file or folder from the cache
*
* when removing a folder from the cache all files and folders inside the folder will be removed as well
*
* @param string $file
* @since 9.0.0
*/
public function remove($file);
/**
* Move a file or folder in the cache
*
* @param string $source
* @param string $target
* @since 9.0.0
*/
public function move($source, $target);
/**
* Move a file or folder in the cache
*
* Note that this should make sure the entries are removed from the source cache
*
* @param \OCP\Files\Cache\ICache $sourceCache
* @param string $sourcePath
* @param string $targetPath
* @throws \OC\DatabaseException
* @since 9.0.0
*/
public function moveFromCache(ICache $sourceCache, $sourcePath, $targetPath);
/**
* Get the scan status of a file
*
* - ICache::NOT_FOUND: File is not in the cache
* - ICache::PARTIAL: File is not stored in the cache but some incomplete data is known
* - ICache::SHALLOW: The folder and it's direct children are in the cache but not all sub folders are fully scanned
* - ICache::COMPLETE: The file or folder, with all it's children) are fully scanned
*
* @param string $file
*
* @return int ICache::NOT_FOUND, ICache::PARTIAL, ICache::SHALLOW or ICache::COMPLETE
* @since 9.0.0
*/
public function getStatus($file);
/**
* search for files matching $pattern
*
* @param string $pattern the search pattern using SQL search syntax (e.g. '%searchstring%')
* @return ICacheEntry[] an array of cache entries where the name matches the search pattern
* @since 9.0.0
*/
public function search($pattern);
/**
* search for files by mimetype
*
* @param string $mimetype either a full mimetype to search ('text/plain') or only the first part of a mimetype ('image')
* where it will search for all mimetypes in the group ('image/*')
* @return ICacheEntry[] an array of cache entries where the mimetype matches the search
* @since 9.0.0
*/
public function searchByMime($mimetype);
/**
* Search for files by tag of a given users.
*
* Note that every user can tag files differently.
*
* @param string|int $tag name or tag id
* @param string $userId owner of the tags
* @return ICacheEntry[] file data
* @since 9.0.0
*/
public function searchByTag($tag, $userId);
/**
* find a folder in the cache which has not been fully scanned
*
* If multiple incomplete folders are in the cache, the one with the highest id will be returned,
* use the one with the highest id gives the best result with the background scanner, since that is most
* likely the folder where we stopped scanning previously
*
* @return string|bool the path of the folder or false when no folder matched
* @since 9.0.0
*/
public function getIncomplete();
/**
* get the path of a file on this storage by it's file id
*
* @param int $id the file id of the file or folder to search
* @return string|null the path of the file (relative to the storage) or null if a file with the given id does not exists within this cache
* @since 9.0.0
*/
public function getPathById($id);
/**
* normalize the given path for usage in the cache
*
* @param string $path
* @return string
* @since 9.0.0
*/
public function normalize($path);
}
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