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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#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, the page size won't
* be changed to the requested value. See bug 634374.
* @note Valid page size values are powers of 2 between 512 and 65536.
* The suggested value is mozIStorageConnection::defaultPageSize.
*/
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);
};
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