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phab/src/applications/files/engineselector/base/PhabricatorFileStorageEngineSelector.php
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PhabricatorFileStorageEngineSelector.php
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<?php
/*
* Copyright 2011 Facebook, Inc.
*
* Licensed 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.
*/
/**
* Chooses appropriate storage engine(s) for files. When Phabricator needs
* to write a blob of file data, it uses the configured selector to get a list
* of suitable @{class:PhabricatorFileStorageEngine}s. For more information,
* see @{article:File Storage Technical Documentation}.
*
* @group filestorage
* @task select Selecting Storage Engines
*/
abstract class PhabricatorFileStorageEngineSelector {
final public function __construct() {
// <empty>
}
/* -( Selecting Storage Engines )------------------------------------------ */
/**
* Select valid storage engines for a file. This method will be called by
* Phabricator when it needs to store a file permanently. It must return a
* list of valid @{class:PhabricatorFileStorageEngine}s.
*
* If you are are extending this class to provide a custom selector, you
* probably just want it to look like this:
*
* return array(new MyCustomFileStorageEngine());
*
* ...that is, store every file in whatever storage engine you're using.
* However, you can also provide multiple storage engines, or store some files
* in one engine and some files in a different engine by implementing a more
* complex selector.
*
* @param string File data.
* @param dict Dictionary of optional file metadata. This may be empty, or
* have some additional keys like 'file' and 'author' which
* provide metadata.
* @return list List of @{class:PhabricatorFileStorageEngine}s, ordered by
* preference.
* @task select
*/
abstract public function selectStorageEngines($data, array $params);
}
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