58 lines
2.2 KiB
Plaintext
58 lines
2.2 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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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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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, the page size won't
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* be changed to the requested value. See bug 634374.
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* @note Valid page size values are powers of 2 between 512 and 65536.
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* The suggested value is mozIStorageConnection::defaultPageSize.
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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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