gecko/netwerk/base/public/nsIIncrementalDownload.idl

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is Google Inc.
* Portions created by the Initial Developer are Copyright (C) 2005
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Darin Fisher <darin@meer.net>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsIRequest.idl"
interface nsIURI;
interface nsIFile;
interface nsIRequestObserver;
/**
* An incremental download object attempts to fetch a file piecemeal over time
* in an effort to minimize network bandwidth usage.
*
* Canceling a background download does not cause the file on disk to be
* deleted.
*/
[scriptable, uuid(6687823f-56c4-461d-93a1-7f6cb7dfbfba)]
interface nsIIncrementalDownload : nsIRequest
{
/**
* Initialize the incremental download object. If the destination file
* already exists, then only the remaining portion of the file will be
* fetched.
*
* NOTE: The downloader will create the destination file if it does not
* already exist. It will create the file with the permissions 0600 if
* needed. To affect the permissions of the file, consumers of this
* interface may create an empty file at the specified destination prior to
* starting the incremental download.
*
* NOTE: Since this class may create a temporary file at the specified
* destination, it is advisable for the consumer of this interface to specify
* a file name for the destination that would not tempt the user into
* double-clicking it. For example, it might be wise to append a file
* extension like ".part" to the end of the destination to protect users from
* accidentally running "blah.exe" before it is a complete file.
*
* @param uri
* The URI to fetch.
* @param destination
* The location where the file is to be stored.
* @param chunkSize
* The size of the chunks to fetch. A non-positive value results in
* the default chunk size being used.
* @param intervalInSeconds
* The amount of time to wait between fetching chunks. Pass a
* negative to use the default interval, or 0 to fetch the remaining
* part of the file in one chunk.
*/
void init(in nsIURI uri, in nsIFile destination, in long chunkSize,
in long intervalInSeconds);
/**
* The URI being fetched.
*/
readonly attribute nsIURI URI;
/**
* The URI being fetched after any redirects have been followed. This
* attribute is set just prior to calling OnStartRequest on the observer
* passed to the start method.
*/
readonly attribute nsIURI finalURI;
/**
* The file where the download is being written.
*/
readonly attribute nsIFile destination;
/**
* The total number of bytes for the requested file. This attribute is set
* just prior to calling OnStartRequest on the observer passed to the start
* method.
*
* This attribute has a value of -1 if the total size is unknown.
*/
readonly attribute long long totalSize;
/**
* The current number of bytes downloaded so far. This attribute is set just
* prior to calling OnStartRequest on the observer passed to the start
* method.
*
* This attribute has a value of -1 if the current size is unknown.
*/
readonly attribute long long currentSize;
/**
* Start the incremental download.
*
* @param observer
* An observer to be notified of various events. OnStartRequest is
* called when finalURI and totalSize have been determined or when an
* error occurs. OnStopRequest is called when the file is completely
* downloaded or when an error occurs. If this object implements
* nsIProgressEventSink, then its OnProgress method will be called as
* data is written to the destination file. If this object implements
* nsIInterfaceRequestor, then it will be assigned as the underlying
* channel's notification callbacks, which allows it to provide a
* nsIAuthPrompt implementation if needed by the channel, for example.
* @param ctxt
* User defined object forwarded to the observer's methods.
*/
void start(in nsIRequestObserver observer,
in nsISupports ctxt);
};