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

/* ***** 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>
 *
 * 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
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 * decision by deleting the provisions above and replace them with the notice
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 * the provisions above, a recipient may use your version of this file under
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 *
 * ***** END LICENSE BLOCK ***** */

#include "nsIRequest.idl"

interface nsIInputStream;
interface nsIOutputStream;
interface nsIRequestObserver;
interface nsIEventTarget;

[scriptable, uuid(72e515de-a91e-4154-bb78-e5244cbaae74)]
interface nsIAsyncStreamCopier : nsIRequest
{
    /**
     * Initialize the stream copier.
     *
     * @param aSource
     *        contains the data to be copied.
     * @param aSink
     *        specifies the destination for the data.
     * @param aTarget
     *        specifies the thread on which the copy will occur.  a null value
     *        is permitted and will cause the copy to occur on an unspecified
     *        background thread.
     * @param aSourceBuffered
     *        true if aSource implements ReadSegments.
     * @param aSinkBuffered
     *        true if aSink implements WriteSegments.
     * @param aChunkSize
     *        specifies how many bytes to read/write at a time.  this controls
     *        the granularity of the copying.  it should match the segment size
     *        of the "buffered" streams involved.
     *
     * NOTE: at least one of the streams must be buffered.
     */
    void init(in nsIInputStream    aSource,
              in nsIOutputStream   aSink,
              in nsIEventTarget    aTarget,
              in boolean           aSourceBuffered,
              in boolean           aSinkBuffered,
              in unsigned long     aChunkSize);

    /**
     * asyncCopy triggers the start of the copy.  The observer will be notified
     * when the copy completes.
     *
     * @param aObserver
     *        receives notifications.
     * @param aObserverContext
     *        passed to observer methods.
     */
    void asyncCopy(in nsIRequestObserver   aObserver,
                   in nsISupports          aObserverContext);
};