/* 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 "nsIRequest.idl"

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

[scriptable, uuid(5a19ca27-e041-4aca-8287-eb248d4c50c0)]
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.
     * @param aCloseSource
     *        true if aSource should be closed after copying.
     * @param aCloseSink
     *        true if aSink should be closed after copying.
     *
     * 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,
              in boolean           aCloseSource,
              in boolean           aCloseSink);

    /**
     * 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);
};
