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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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++
namespace mozilla {
namespace net {
class ADivertableParentChannel;
}
}
%}

[ptr] native ADivertableParentChannelPtr(mozilla::net::ADivertableParentChannel);

/** When we are diverting messages from the child to the parent. The
 *  nsHttpChannel and nsFtpChannel must know that there is a ChannelParent to
 *  be able to suspend message delivery if the channel is suspended.
 */
[uuid(c073d79f-2503-4dff-ba87-d3071f8b433b)]
interface nsIChannelWithDivertableParentListener : nsISupports
{
  /**
   * Informs nsHttpChannel or nsFtpChannel that a ParentChannel starts
   * diverting messages. During this time all suspend/resume calls to the
   * channel must also suspend the ParentChannel by calling
   * SuspendMessageDiversion/ResumeMessageDiversion.
   */
  void MessageDiversionStarted(in ADivertableParentChannelPtr aParentChannel);

  /**
   * The message diversion has finished the calls to
   * SuspendMessageDiversion/ResumeMessageDiversion are not necessary anymore.
   */
  void MessageDiversionStop();

  /**
   * Internal versions of Suspend/Resume that suspend (or resume) the channel
   * but do not suspend the ParentChannel's IPDL message queue.
   */
  void SuspendInternal();
  void ResumeInternal();
};