d9ba7cd005
This reduces the odds of having files without corresponding wiki pages, given that the later is done in a deferred update. Also made some documentation cleanups. Bug: T187942 Change-Id: Iff516669f535713d37e0011e2d7ed285c667f1c5
119 lines
3.9 KiB
PHP
119 lines
3.9 KiB
PHP
<?php
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/**
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* Service for loading and storing data blobs.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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* http://www.gnu.org/copyleft/gpl.html
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*
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* @file
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*/
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namespace MediaWiki\Storage;
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/**
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* Service for loading and storing data blobs.
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*
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* @note This was written to act as a drop-in replacement for the corresponding
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* static methods in Revision.
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*
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* @since 1.31
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*/
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interface BlobStore {
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/**
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* Hint key for use with storeBlob, indicating the general role the block
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* takes in the application. For instance, it should be "page-content" if
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* the blob represents a Content object.
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*/
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const DESIGNATION_HINT = 'designation';
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/**
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* Hint key for use with storeBlob, indicating the page the blob is associated with.
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* This may be used for sharding.
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*/
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const PAGE_HINT = 'page_id';
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/**
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* Hint key for use with storeBlob, indicating the slot the blob is associated with.
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* May be relevant for reference counting.
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*/
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const ROLE_HINT = 'role_name';
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/**
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* Hint key for use with storeBlob, indicating the revision the blob is associated with.
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* This may be used for differential storage and reference counting.
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*/
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const REVISION_HINT = 'rev_id';
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/**
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* Hint key for use with storeBlob, indicating the parent revision of the revision
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* the blob is associated with. This may be used for differential storage.
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*/
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const PARENT_HINT = 'rev_parent_id';
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/**
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* Hint key for use with storeBlob, providing the SHA1 hash of the blob as passed to the
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* method. This can be used to avoid re-calculating the hash if it is needed by the BlobStore.
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*/
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const SHA1_HINT = 'cont_sha1';
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/**
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* Hint key for use with storeBlob, indicating the model of the content encoded in the
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* given blob. May be used to implement optimized storage for some well known models.
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*/
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const MODEL_HINT = 'cont_model';
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/**
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* Hint key for use with storeBlob, indicating the serialization format used to create
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* the blob, as a MIME type. May be used for optimized storage in the underlying database.
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*/
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const FORMAT_HINT = 'cont_format';
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/**
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* Retrieve a blob, given an address.
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*
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* MCR migration note: this replaces Revision::loadText
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*
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* @param string $blobAddress The blob address as returned by storeBlob(),
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* such as "tt:12345" or "ex:DB://s16/456/9876".
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* @param int $queryFlags See IDBAccessObject.
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*
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* @throws BlobAccessException
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* @return string binary blob data
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*/
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public function getBlob( $blobAddress, $queryFlags = 0 );
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/**
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* Stores an arbitrary blob of data and returns an address that can be used with
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* getBlob() to retrieve the same blob of data,
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*
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* @param string $data raw binary data
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* @param array $hints An array of hints. Implementations may use the hints to optimize storage.
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* All hints are optional, supported hints depend on the implementation. Hint names by
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* convention correspond to the names of fields in the database. Callers are encouraged to
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* provide the well known hints as defined by the XXX_HINT constants.
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*
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* @throws BlobAccessException
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* @return string an address that can be used with getBlob() to retrieve the data.
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*/
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public function storeBlob( $data, $hints = [] );
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/**
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* Check if the blob metadata or backing blob data store is read-only
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*
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* @return bool
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*/
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public function isReadOnly();
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}
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