mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-28 15:23:51 +00:00
297 lines
12 KiB
Plaintext
297 lines
12 KiB
Plaintext
/* -*- Mode: idl; 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"
|
|
|
|
%{C++
|
|
|
|
#include "nsLiteralString.h"
|
|
|
|
%}
|
|
|
|
interface mozIStorageConnection;
|
|
interface nsIFile;
|
|
interface nsIFileURL;
|
|
interface nsIPropertyBag2;
|
|
interface nsIVariant;
|
|
interface mozIStorageCompletionCallback;
|
|
|
|
/**
|
|
* The mozIStorageService interface is intended to be implemented by
|
|
* a service that can create storage connections (mozIStorageConnection)
|
|
* to either a well-known profile database or to a specific database file.
|
|
*
|
|
* This is the only way to open a database connection.
|
|
*
|
|
* @note The first reference to mozIStorageService must be made on the main
|
|
* thread.
|
|
*/
|
|
[scriptable, uuid(07b6b2f5-6d97-47b4-9584-e65bc467fe9e)]
|
|
interface mozIStorageService : nsISupports {
|
|
/**
|
|
* Open the database with default flags in default mode.
|
|
*/
|
|
const unsigned long OPEN_DEFAULT = 0;
|
|
|
|
/**
|
|
* Open the database with a shared cache. The shared-cache mode
|
|
* is more memory-efficient when many connections to the same database
|
|
* are expected, though, the connections will contend the cache resource.
|
|
* When performance matters, working without a shared-cache will
|
|
* improve concurrency. @see openUnsharedDatabase
|
|
*/
|
|
const unsigned long OPEN_SHARED = 1 << 0;
|
|
|
|
/**
|
|
* Open the underlying database in read-only mode.
|
|
*/
|
|
const unsigned long OPEN_READONLY = 1 << 1;
|
|
|
|
/**
|
|
* Allow simultaneous access to an asynchronous read-only database
|
|
* without any file locking.
|
|
*
|
|
* For synchronous database, the flag has no effect.
|
|
*
|
|
* Specifying the OPEN_IGNORE_LOCKING_MODE flag will automatically
|
|
* turn on the OPEN_READONLY flag.
|
|
*/
|
|
const unsigned long OPEN_IGNORE_LOCKING_MODE = 1 << 2;
|
|
|
|
/**
|
|
* All optional connection object features are off.
|
|
*/
|
|
const unsigned long CONNECTION_DEFAULT = 0;
|
|
|
|
/**
|
|
* Enable Interrupt-method for the synchronous connection object
|
|
* returned by openDatabase, openSpecialDatabase, openUnsharedDatabase
|
|
* or openDatabaseWithFileURL calls.
|
|
*
|
|
* When this flag is not set, Interrupt-method of a
|
|
* synchronous connection must not be used.
|
|
*
|
|
* Asynchronous connection is always interruptible and the flag
|
|
* does not change anything.
|
|
*
|
|
* The following are among the potential risks side effects of
|
|
* calling the Interrupt-method:
|
|
* - new queries started on a different thread after the
|
|
* interrupt call, but before its completion, are interrupted as if
|
|
* they had been running prior to the interrupt call. Thus thread
|
|
* synchronization is necessary.
|
|
* - calls to close the database will wait until the interruption
|
|
* finishes.
|
|
*/
|
|
const unsigned long CONNECTION_INTERRUPTIBLE = 1 << 0;
|
|
|
|
/**
|
|
* Open an asynchronous connection to a database.
|
|
*
|
|
* This method MUST be called from the main thread. The connection object
|
|
* returned by this function is not threadsafe. You MUST use it only from
|
|
* the main thread.
|
|
*
|
|
* If you have more than one connection to a file, you MUST use the EXACT
|
|
* SAME NAME for the file each time, including case. The sqlite code uses
|
|
* a simple string compare to see if there is already a connection. Opening
|
|
* a connection to "Foo.sqlite" and "foo.sqlite" will CORRUPT YOUR DATABASE.
|
|
*
|
|
* @param aDatabaseStore Either a nsIFile representing the file that contains
|
|
* the database or a special string to open a special database. The special
|
|
* string may be:
|
|
* - "memory" to open an in-memory database.
|
|
*
|
|
* @param [optional] aOpenFlags
|
|
* A set of flags to open the database with optional features.
|
|
* Currently supports OPEN_SHARED, OPEN_READONLY and
|
|
* OPEN_IGNORE_LOCKING_MODE flags.
|
|
* For full details, please refer to the documentation of the flags.
|
|
*
|
|
* @param [optional] aConnectionFlags
|
|
* A set of flags to enable optional features for the returned
|
|
* asynchronous connection object.
|
|
* Currently supports CONNECTION_INTERRUPTIBLE flag.
|
|
* For full details, please refer to the documentation of the flag.
|
|
*
|
|
* @param aCallback A callback that will receive the result of the operation.
|
|
* In case of error, it may receive as status:
|
|
* - NS_ERROR_OUT_OF_MEMORY if allocating a new storage object fails.
|
|
* - NS_ERROR_FILE_CORRUPTED if the database file is corrupted.
|
|
* In case of success, it receives as argument the new database
|
|
* connection, as an instance of |mozIStorageAsyncConnection|.
|
|
*
|
|
* @throws NS_ERROR_INVALID_ARG if |aDatabaseStore| is neither a file nor
|
|
* one of the special strings understood by this method, or if one of
|
|
* the options passed through |aOptions| does not have
|
|
* the right type.
|
|
* @throws NS_ERROR_NOT_SAME_THREAD if called from a thread other than the
|
|
* main thread.
|
|
*/
|
|
void openAsyncDatabase(in nsIVariant aDatabaseStore,
|
|
[optional] in unsigned long aOpenFlags,
|
|
[optional] in unsigned long aConnectionFlags,
|
|
in mozIStorageCompletionCallback aCallback);
|
|
|
|
/**
|
|
* Get a connection to a named special database storage.
|
|
*
|
|
* @param aStorageKey a string key identifying the type of storage
|
|
* requested. Valid values include: "memory".
|
|
*
|
|
* @param aName an optional string identifying the name of the database.
|
|
* If omitted, a filename of ":memory:" will be used which results in a
|
|
* private in-memory database specific to this connection, making it
|
|
* impossible to clone the in-memory database. If you want to be able to
|
|
* clone the connection (or otherwise connect to the in-memory database from
|
|
* a connection), then you must pick a name that's sufficiently unique within
|
|
* the process to not collide with other mozStorage users.
|
|
*
|
|
* @param [optional] aConnectionFlags
|
|
* A set of flags to enable optional features for the returned
|
|
* synchronous connection object.
|
|
* Currently supports CONNECTION_INTERRUPTIBLE flag.
|
|
* For full details, please refer to the documentation of the flag.
|
|
*
|
|
* @see openDatabase for restrictions on how database connections may be
|
|
* used. For the profile database, you should only access it from the main
|
|
* thread since other callers may also have connections.
|
|
*
|
|
* @returns a new mozIStorageConnection for the requested
|
|
* storage database.
|
|
*
|
|
* @throws NS_ERROR_INVALID_ARG if aStorageKey is invalid.
|
|
*/
|
|
mozIStorageConnection openSpecialDatabase(
|
|
in ACString aStorageKey,
|
|
[optional] in ACString aName,
|
|
[optional] in unsigned long aConnectionFlags);
|
|
|
|
/**
|
|
* Open a connection to the specified file.
|
|
*
|
|
* Consumers should check mozIStorageConnection::connectionReady to ensure
|
|
* that they can use the database. If this value is false, it is strongly
|
|
* recommended that the database be backed up with
|
|
* mozIStorageConnection::backupDB so user data is not lost.
|
|
*
|
|
* ==========
|
|
* DANGER
|
|
* ==========
|
|
*
|
|
* If you have more than one connection to a file, you MUST use the EXACT
|
|
* SAME NAME for the file each time, including case. The sqlite code uses
|
|
* a simple string compare to see if there is already a connection. Opening
|
|
* a connection to "Foo.sqlite" and "foo.sqlite" will CORRUPT YOUR DATABASE.
|
|
*
|
|
* The connection object returned by this function is not threadsafe. You
|
|
* must use it only from the thread you created it from.
|
|
*
|
|
* @param aDatabaseFile
|
|
* A nsIFile that represents the database that is to be opened.
|
|
* @param [optional] aConnectionFlags
|
|
* A set of flags to enable optional features for the returned
|
|
* synchronous connection object.
|
|
* Currently supports CONNECTION_INTERRUPTIBLE flag.
|
|
* For full details, please refer to the documentation of the flag.
|
|
*
|
|
* @returns a mozIStorageConnection for the requested database file.
|
|
*
|
|
* @throws NS_ERROR_OUT_OF_MEMORY
|
|
* If allocating a new storage object fails.
|
|
* @throws NS_ERROR_FILE_CORRUPTED
|
|
* If the database file is corrupted.
|
|
*/
|
|
mozIStorageConnection openDatabase(
|
|
in nsIFile aDatabaseFile, [optional] in unsigned long aConnectionFlags);
|
|
|
|
/**
|
|
* Open a connection to the specified file that doesn't share a sqlite cache.
|
|
*
|
|
* Without a shared-cache, each connection uses its own pages cache, which
|
|
* may be memory inefficient with a large number of connections, in such a
|
|
* case so you should use openDatabase instead. On the other side, if cache
|
|
* contention may be an issue, for instance when concurrency is important to
|
|
* ensure responsiveness, using unshared connections may be a
|
|
* performance win.
|
|
*
|
|
* ==========
|
|
* DANGER
|
|
* ==========
|
|
*
|
|
* If you have more than one connection to a file, you MUST use the EXACT
|
|
* SAME NAME for the file each time, including case. The sqlite code uses
|
|
* a simple string compare to see if there is already a connection. Opening
|
|
* a connection to "Foo.sqlite" and "foo.sqlite" will CORRUPT YOUR DATABASE.
|
|
*
|
|
* The connection object returned by this function is not threadsafe. You
|
|
* must use it only from the thread you created it from.
|
|
*
|
|
* @param aDatabaseFile
|
|
* A nsIFile that represents the database that is to be opened.
|
|
* @param [optional] aConnectionFlags
|
|
* A set of flags to enable optional features for the returned
|
|
* synchronous connection object.
|
|
* Currently supports CONNECTION_INTERRUPTIBLE flag.
|
|
* For full details, please refer to the documentation of the flag.
|
|
*
|
|
* @returns a mozIStorageConnection for the requested database file.
|
|
*
|
|
* @throws NS_ERROR_OUT_OF_MEMORY
|
|
* If allocating a new storage object fails.
|
|
* @throws NS_ERROR_FILE_CORRUPTED
|
|
* If the database file is corrupted.
|
|
*/
|
|
mozIStorageConnection openUnsharedDatabase(
|
|
in nsIFile aDatabaseFile, [optional] in unsigned long aConnectionFlags);
|
|
|
|
/**
|
|
* See openDatabase(). Exactly the same only initialized with a file URL.
|
|
* Custom parameters can be passed to SQLite and VFS implementations through
|
|
* the query part of the URL.
|
|
*
|
|
* @param aURL
|
|
* A nsIFileURL that represents the database that is to be opened.
|
|
* @param [optional] aTelemetryFilename
|
|
* The name to use for the database in telemetry. Only needed if the
|
|
* actual filename can contain sensitive information.
|
|
* @param [optional] aConnectionFlags
|
|
* A set of flags to enable optional features for the returned
|
|
* synchronous connection object.
|
|
* Currently supports CONNECTION_INTERRUPTIBLE flag.
|
|
* For full details, please refer to the documentation of the flag.
|
|
*/
|
|
mozIStorageConnection openDatabaseWithFileURL(
|
|
in nsIFileURL aFileURL, [optional] in ACString aTelemetryFilename,
|
|
[optional] in unsigned long aConnectionFlags);
|
|
|
|
/*
|
|
* Utilities
|
|
*/
|
|
|
|
/**
|
|
* Copies the specified database file to the specified parent directory with
|
|
* the specified file name. If the parent directory is not specified, it
|
|
* places the backup in the same directory as the current file. This
|
|
* function ensures that the file being created is unique.
|
|
*
|
|
* @param aDBFile
|
|
* The database file that will be backed up.
|
|
* @param aBackupFileName
|
|
* The name of the new backup file to create.
|
|
* @param [optional] aBackupParentDirectory
|
|
* The directory you'd like the backup file to be placed.
|
|
* @return The nsIFile representing the backup file.
|
|
*/
|
|
nsIFile backupDatabaseFile(in nsIFile aDBFile, in AString aBackupFileName,
|
|
[optional] in nsIFile aBackupParentDirectory);
|
|
};
|
|
|
|
%{C++
|
|
|
|
constexpr auto kMozStorageMemoryStorageKey = "memory"_ns;
|
|
|
|
%}
|