mirror of
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194 lines
7.9 KiB
Plaintext
194 lines
7.9 KiB
Plaintext
/* -*- Mode: idl; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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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interface nsIFile;
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interface nsIFileURL;
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interface nsIPropertyBag2;
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interface nsIVariant;
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interface mozIStorageCompletionCallback;
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/**
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* The mozIStorageService interface is intended to be implemented by
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* a service that can create storage connections (mozIStorageConnection)
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* to either a well-known profile database or to a specific database file.
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*
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* This is the only way to open a database connection.
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*
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* @note The first reference to mozIStorageService must be made on the main
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* thread.
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*/
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[scriptable, uuid(07b6b2f5-6d97-47b4-9584-e65bc467fe9e)]
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interface mozIStorageService : nsISupports {
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/**
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* Open an asynchronous connection to a database.
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*
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* This method MUST be called from the main thread. The connection object
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* returned by this function is not threadsafe. You MUST use it only from
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* the main thread.
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*
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* If you have more than one connection to a file, you MUST use the EXACT
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* SAME NAME for the file each time, including case. The sqlite code uses
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* a simple string compare to see if there is already a connection. Opening
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* a connection to "Foo.sqlite" and "foo.sqlite" will CORRUPT YOUR DATABASE.
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*
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* @param aDatabaseStore Either a nsIFile representing the file that contains
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* the database or a special string to open a special database. The special
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* string may be:
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* - "memory" to open an in-memory database.
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*
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* @param aOptions A set of options (may be null). Options may contain:
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* - bool shared (defaults to |false|).
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* -- If |true|, opens the database with a shared-cache. The
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* shared-cache mode is more memory-efficient when many
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* connections to the same database are expected, though, the
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* connections will contend the cache resource. In any cases
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* where performance matter, working without a shared-cache will
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* improve concurrency. @see openUnsharedDatabase
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*
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* - int growthIncrement (defaults to none).
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* -- Set the growth increment for the main database. This hints SQLite to
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* grow the database file by a given chunk size and may reduce
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* filesystem fragmentation on large databases.
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* @see mozIStorageConnection::setGrowthIncrement
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*
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* @param aCallback A callback that will receive the result of the operation.
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* In case of error, it may receive as status:
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* - NS_ERROR_OUT_OF_MEMORY if allocating a new storage object fails.
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* - NS_ERROR_FILE_CORRUPTED if the database file is corrupted.
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* In case of success, it receives as argument the new database
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* connection, as an instance of |mozIStorageAsyncConnection|.
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*
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* @throws NS_ERROR_INVALID_ARG if |aDatabaseStore| is neither a file nor
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* one of the special strings understood by this method, or if one of
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* the options passed through |aOptions| does not have the right type.
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* @throws NS_ERROR_NOT_SAME_THREAD if called from a thread other than the
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* main thread.
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*/
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void openAsyncDatabase(in nsIVariant aDatabaseStore,
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[optional] in nsIPropertyBag2 aOptions,
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in mozIStorageCompletionCallback aCallback);
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/**
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* Get a connection to a named special database storage.
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*
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* @param aStorageKey a string key identifying the type of storage
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* requested. Valid values include: "memory".
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*
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* @see openDatabase for restrictions on how database connections may be
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* used. For the profile database, you should only access it from the main
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* thread since other callers may also have connections.
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*
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* @returns a new mozIStorageConnection for the requested
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* storage database.
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*
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* @throws NS_ERROR_INVALID_ARG if aStorageKey is invalid.
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*/
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mozIStorageConnection openSpecialDatabase(in string aStorageKey);
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/**
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* Open a connection to the specified file.
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*
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* Consumers should check mozIStorageConnection::connectionReady to ensure
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* that they can use the database. If this value is false, it is strongly
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* recommended that the database be backed up with
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* mozIStorageConnection::backupDB so user data is not lost.
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*
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* ==========
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* DANGER
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* ==========
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*
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* If you have more than one connection to a file, you MUST use the EXACT
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* SAME NAME for the file each time, including case. The sqlite code uses
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* a simple string compare to see if there is already a connection. Opening
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* a connection to "Foo.sqlite" and "foo.sqlite" will CORRUPT YOUR DATABASE.
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*
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* The connection object returned by this function is not threadsafe. You must
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* use it only from the thread you created it from.
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*
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* @param aDatabaseFile
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* A nsIFile that represents the database that is to be opened..
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*
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* @returns a mozIStorageConnection for the requested database file.
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*
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* @throws NS_ERROR_OUT_OF_MEMORY
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* If allocating a new storage object fails.
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* @throws NS_ERROR_FILE_CORRUPTED
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* If the database file is corrupted.
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*/
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mozIStorageConnection openDatabase(in nsIFile aDatabaseFile);
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/**
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* Open a connection to the specified file that doesn't share a sqlite cache.
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*
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* Without a shared-cache, each connection uses its own pages cache, which
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* may be memory inefficient with a large number of connections, in such a
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* case so you should use openDatabase instead. On the other side, if cache
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* contention may be an issue, for instance when concurrency is important to
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* ensure responsiveness, using unshared connections may be a performance win.
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*
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* ==========
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* DANGER
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* ==========
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*
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* If you have more than one connection to a file, you MUST use the EXACT
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* SAME NAME for the file each time, including case. The sqlite code uses
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* a simple string compare to see if there is already a connection. Opening
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* a connection to "Foo.sqlite" and "foo.sqlite" will CORRUPT YOUR DATABASE.
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*
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* The connection object returned by this function is not threadsafe. You must
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* use it only from the thread you created it from.
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*
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* @param aDatabaseFile
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* A nsIFile that represents the database that is to be opened.
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*
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* @returns a mozIStorageConnection for the requested database file.
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*
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* @throws NS_ERROR_OUT_OF_MEMORY
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* If allocating a new storage object fails.
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* @throws NS_ERROR_FILE_CORRUPTED
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* If the database file is corrupted.
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*/
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mozIStorageConnection openUnsharedDatabase(in nsIFile aDatabaseFile);
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/**
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* See openDatabase(). Exactly the same only initialized with a file URL.
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* Custom parameters can be passed to SQLite and VFS implementations through
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* the query part of the URL.
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*
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* @param aURL
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* A nsIFileURL that represents the database that is to be opened.
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*/
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mozIStorageConnection openDatabaseWithFileURL(in nsIFileURL aFileURL);
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/*
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* Utilities
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*/
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/**
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* Copies the specified database file to the specified parent directory with
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* the specified file name. If the parent directory is not specified, it
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* places the backup in the same directory as the current file. This function
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* ensures that the file being created is unique.
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*
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* @param aDBFile
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* The database file that will be backed up.
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* @param aBackupFileName
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* The name of the new backup file to create.
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* @param [optional] aBackupParentDirectory
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* The directory you'd like the backup file to be placed.
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* @return The nsIFile representing the backup file.
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*/
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nsIFile backupDatabaseFile(in nsIFile aDBFile, in AString aBackupFileName,
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[optional] in nsIFile aBackupParentDirectory);
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};
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%{C++
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#define MOZ_STORAGE_MEMORY_STORAGE_KEY "memory"
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%}
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