pjs/xpcom/io/nsIInputStreamTee.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.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 2001
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Darin Fisher <darin@netscape.com> (original author)
*
* Alternatively, the contents of this file may be used under the terms of
* either of 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
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* ***** END LICENSE BLOCK ***** */
#include "nsIInputStream.idl"
interface nsIOutputStream;
interface nsIEventTarget;
/**
* A nsIInputStreamTee is a wrapper for an input stream, that when read
* reads the specified amount of data from its |source| and copies that
* data to its |sink|. |sink| must be a blocking output stream.
*/
[scriptable, uuid(90a9d790-3bca-421e-a73b-98f68e13c917)]
interface nsIInputStreamTee : nsIInputStream
{
attribute nsIInputStream source;
attribute nsIOutputStream sink;
/**
* If |eventTarget| is set, copying to sink is done asynchronously using
* the event-target (e.g. a thread). If |eventTarget| is not set, or if
* storage-policy is STORE_ON_DISK_AS_FILE, copying to sink happens
* synchronously while reading from the source.
*/
attribute nsIEventTarget eventTarget;
};
%{C++
// factory methods
extern nsresult
NS_NewInputStreamTee(nsIInputStream **tee, // read from this input stream
nsIInputStream *source,
nsIOutputStream *sink);
extern nsresult
NS_NewInputStreamTeeAsync(nsIInputStream **tee, // read from this input stream
nsIInputStream *source,
nsIOutputStream *sink,
nsIEventTarget *eventTarget);
%}