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