243 lines
7.2 KiB
PHP
243 lines
7.2 KiB
PHP
<?php
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/**
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* @author Robin Appelman <icewind@owncloud.com>>
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*
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* @copyright Copyright (c) 2015, ownCloud, Inc.
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* @license AGPL-3.0
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*
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* This code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License, version 3,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License, version 3,
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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*
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*/
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namespace OCP\Files\Cache;
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/**
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* Metadata cache for a storage
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*
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* The cache stores the metadata for all files and folders in a storage and is kept up to date trough the following mechanisms:
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*
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* - Scanner: scans the storage and updates the cache where needed
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* - Watcher: checks for changes made to the filesystem outside of the ownCloud instance and rescans files and folder when a change is detected
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* - Updater: listens to changes made to the filesystem inside of the ownCloud instance and updates the cache where needed
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* - ChangePropagator: updates the mtime and etags of parent folders whenever a change to the cache is made to the cache by the updater
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*/
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interface ICache {
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const NOT_FOUND = 0;
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const PARTIAL = 1; //only partial data available, file not cached in the database
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const SHALLOW = 2; //folder in cache, but not all child files are completely scanned
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const COMPLETE = 3;
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/**
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* Get the numeric storage id for this cache's storage
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*
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* @return int
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*/
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public function getNumericStorageId();
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/**
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* get the stored metadata of a file or folder
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*
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* @param string | int $file either the path of a file or folder or the file id for a file or folder
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* @return ICacheEntry[]|false the cache entry or false if the file is not found in the cache
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*/
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public function get($file);
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/**
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* get the metadata of all files stored in $folder
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*
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* @param string $folder
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* @return ICacheEntry[]
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*/
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public function getFolderContents($folder);
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/**
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* get the metadata of all files stored in $folder
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*
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* @param int $fileId the file id of the folder
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* @return ICacheEntry[]
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*/
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public function getFolderContentsById($fileId);
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/**
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* store meta data for a file or folder
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*
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* @param string $file
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* @param array $data
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*
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* @return int file id
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* @throws \RuntimeException
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*/
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public function put($file, array $data);
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/**
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* update the metadata of an existing file or folder in the cache
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*
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* @param int $id the fileid of the existing file or folder
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* @param array $data [$key => $value] the metadata to update, only the fields provided in the array will be updated, non-provided values will remain unchanged
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*/
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public function update($id, array $data);
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/**
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* get the file id for a file
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*
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* 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
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*
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* File ids are easiest way for apps to store references to a file since unlike paths they are not affected by renames or sharing
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*
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* @param string $file
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* @return int
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*/
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public function getId($file);
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/**
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* get the id of the parent folder of a file
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*
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* @param string $file
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* @return int
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*/
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public function getParentId($file);
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/**
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* check if a file is available in the cache
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*
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* @param string $file
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* @return bool
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*/
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public function inCache($file);
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/**
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* remove a file or folder from the cache
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*
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* when removing a folder from the cache all files and folders inside the folder will be removed as well
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*
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* @param string $file
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*/
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public function remove($file);
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/**
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* Move a file or folder in the cache
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*
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* @param string $source
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* @param string $target
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*/
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public function move($source, $target);
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/**
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* Move a file or folder in the cache
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*
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* @param \OCP\Files\Cache\ICache $sourceCache
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* @param string $sourcePath
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* @param string $targetPath
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* @throws \OC\DatabaseException
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*/
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public function moveFromCache(ICache $sourceCache, $sourcePath, $targetPath);
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/**
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* remove all entries for files that are stored on the storage from the cache
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*/
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public function clear();
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/**
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* Get the scan status of a file
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*
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* - ICache::NOT_FOUND: File is not in the cache
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* - ICache::PARTIAL: File is not stored in the cache but some incomplete data is known
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* - ICache::SHALLOW: The folder and it's direct children are in the cache but not all sub folders are fully scanned
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* - ICache::COMPLETE: The file or folder, with all it's children) are fully scanned
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*
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* @param string $file
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*
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* @return int ICache::NOT_FOUND, ICache::PARTIAL, ICache::SHALLOW or ICache::COMPLETE
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*/
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public function getStatus($file);
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/**
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* search for files matching $pattern
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*
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* @param string $pattern the search pattern using SQL search syntax (e.g. '%searchstring%')
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* @return ICacheEntry[] an array of cache entries where the name matches the search pattern
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*/
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public function search($pattern);
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/**
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* search for files by mimetype
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*
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* @param string $mimetype either a full mimetype to search ('text/plain') or only the first part of a mimetype ('image')
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* where it will search for all mimetypes in the group ('image/*')
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* @return ICacheEntry[] an array of cache entries where the mimetype matches the search
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*/
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public function searchByMime($mimetype);
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/**
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* Search for files by tag of a given users.
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*
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* Note that every user can tag files differently.
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*
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* @param string|int $tag name or tag id
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* @param string $userId owner of the tags
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* @return ICacheEntry[] file data
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*/
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public function searchByTag($tag, $userId);
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/**
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* Re-calculate the folder size and the size of all parent folders
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*
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* @param string|boolean $path
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* @param array $data (optional) meta data of the folder
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*/
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public function correctFolderSize($path, $data = null);
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/**
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* calculate the size of a folder and set it in the cache
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*
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* @param string $path
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* @param array $entry (optional) meta data of the folder
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* @return int
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*/
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public function calculateFolderSize($path, $entry = null);
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/**
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* get all file ids on the files on the storage
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*
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* @return int[]
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*/
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public function getAll();
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/**
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* find a folder in the cache which has not been fully scanned
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*
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* If multiple incomplete folders are in the cache, the one with the highest id will be returned,
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* use the one with the highest id gives the best result with the background scanner, since that is most
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* likely the folder where we stopped scanning previously
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*
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* @return string|bool the path of the folder or false when no folder matched
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*/
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public function getIncomplete();
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/**
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* get the path of a file on this storage by it's file id
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*
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* @param int $id the file id of the file or folder to search
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* @return string|null the path of the file (relative to the storage) or null if a file with the given id does not exists within this cache
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*/
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public function getPathById($id);
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/**
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* normalize the given path for usage in the cache
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*
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* @param string $path
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* @return string
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*/
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public function normalize($path);
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}
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