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

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/* ***** 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
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 2002
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Darin Fisher <darin@netscape.com>
* Christian Biesinger <cbiesinger@web.de>
*
* 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 nsIInputStream;
interface nsIStreamListener;
/**
* nsIInputStreamPump
*
* This interface provides a means to configure and use a input stream pump
* instance. The input stream pump will asynchronously read from a input
* stream, and push data to a nsIStreamListener instance. It utilizes the
* current thread's nsIEventTarget in order to make reading from the stream
* asynchronous.
*
* If the given stream supports nsIAsyncInputStream, then the stream pump will
* call the stream's AsyncWait method to drive the stream listener. Otherwise,
* the stream will be read on a background thread utilizing the stream
* transport service. More details are provided below.
*/
[scriptable, uuid(400F5468-97E7-4d2b-9C65-A82AECC7AE82)]
interface nsIInputStreamPump : nsIRequest
{
/**
* Initialize the input stream pump.
*
* @param aStream
* contains the data to be read. if the input stream is non-blocking,
* then it will be QI'd to nsIAsyncInputStream. if the QI succeeds
* then the stream will be read directly. otherwise, it will be read
* on a background thread using the stream transport service.
* @param aStreamPos
* specifies the stream offset from which to start reading. the
* offset value is absolute. pass -1 to specify the current offset.
* NOTE: this parameter is ignored if the underlying stream does not
* implement nsISeekableStream.
* @param aStreamLen
* specifies how much data to read from the stream. pass -1 to read
* all data available in the stream.
* @param aSegmentSize
* if the stream transport service is used, then this parameter
* specifies the segment size for the stream transport's buffer.
* pass 0 to specify the default value.
* @param aSegmentCount
* if the stream transport service is used, then this parameter
* specifies the segment count for the stream transport's buffer.
* pass 0 to specify the default value.
* @param aCloseWhenDone
* if true, the input stream will be closed after it has been read.
*/
void init(in nsIInputStream aStream,
in long long aStreamPos,
in long long aStreamLen,
in unsigned long aSegmentSize,
in unsigned long aSegmentCount,
in boolean aCloseWhenDone);
/**
* asyncRead causes the input stream to be read in chunks and delivered
* asynchronously to the listener via OnDataAvailable.
*
* @param aListener
* receives notifications.
* @param aListenerContext
* passed to listener methods.
*/
void asyncRead(in nsIStreamListener aListener,
in nsISupports aListenerContext);
};