gecko-dev/storage/public/mozIStorageVacuumParticipan...

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: sw=2 ts=2 et lcs=trail\:.,tab\:>~ :
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozStorage.
*
* The Initial Developer of the Original Code is
* the Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Marco Bonardo <mak77@bonardo.net> (Original Author)
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
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* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsISupports.idl"
interface mozIStorageConnection;
/**
* This interface contains the information that the Storage service needs to
* vacuum a database. This interface is created as a service through the
* category manager with the category "vacuum-participant".
* Please see https://developer.mozilla.org/en/mozIStorageVacuumParticipant for
* more information.
*/
[scriptable, uuid(8f367508-1d9a-4d3f-be0c-ac11b6dd7dbf)]
interface mozIStorageVacuumParticipant : nsISupports {
/**
* The expected page size in bytes for the database. The vacuum manager will
* try to correct the page size during idle based on this value.
*
* @note If the database is using the WAL journal mode and the current page
* size is not the expected one, the journal mode will be changed to
* TRUNCATE because WAL does not allow page size changes.
* The vacuum manager will try to restore WAL mode, but for this to
* work reliably the participant must ensure to always reset statements.
* If restoring the journal mode should fail it will stick to TRUNCATE.
* @note Valid page size values are from 512 to 65536.
* The suggested value is mozIStorageConnection::DEFAULT_PAGE_SIZE.
*/
readonly attribute long expectedDatabasePageSize;
/**
* Connection to the database file to be vacuumed.
*/
readonly attribute mozIStorageConnection databaseConnection;
/**
* Notifies when a vacuum operation begins. Listeners should avoid using the
* database till onEndVacuum is received.
*
* @return true to proceed with the vacuum, false if the participant wants to
* opt-out for now, it will be retried later. Useful when participant
* is running some other heavy operation that can't be interrupted.
*
* @note When a vacuum operation starts or ends it will also dispatch a global
* "heavy-io-task" notification through the observer service with the
* data argument being either "vacuum-begin" or "vacuum-end".
*/
boolean onBeginVacuum();
/**
* Notifies when a vacuum operation ends.
*
* @param aSucceeded
* reports if the vacuum succeeded or failed.
*/
void onEndVacuum(in boolean aSucceeded);
};