gecko-dev/netwerk/base/public/nsITraceableChannel.idl

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** 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.
*
* The Initial Developer of the Original Code is
* Jan Wrobel <wrobel@blues.ath.cx>
* Portions created by the Initial Developer are Copyright (C) 2008
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Jan Odvarko <odvarko@gmail.com>
*
* 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 "nsISupports.idl"
interface nsIStreamListener;
/**
* A channel implementing this interface allows one to intercept its data by
* inserting intermediate stream listeners.
*/
[scriptable, uuid(68167b0b-ef34-4d79-a09a-8045f7c5140e)]
interface nsITraceableChannel : nsISupports
{
/*
* Replace the channel's listener with a new one, and return the listener
* the channel used to have. The new listener intercepts OnStartRequest,
* OnDataAvailable and OnStopRequest calls and must pass them to
* the original listener after examination. If multiple callers replace
* the channel's listener, a chain of listeners is created.
* The caller of setNewListener has no way to control at which place
* in the chain its listener is placed.
*
* Note: The caller of setNewListener must not delay passing
* OnStartRequest to the original listener.
*
* Note2: A channel may restrict when the listener can be replaced.
* It is not recommended to allow listener replacement after OnStartRequest
* has been called.
*/
nsIStreamListener setNewListener(in nsIStreamListener aListener);
};