/* ***** 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
 * 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 "nsISupports.idl"

interface nsIInputStream;
interface nsIOutputStream;
interface nsITransportEventSink;
interface nsIEventQueue;

[scriptable, uuid(cbb0baeb-5fcb-408b-a2be-9f8fc98d0af1)]
interface nsITransport : nsISupports
{
    /**
     * Open flags.
     */
    const unsigned long OPEN_BLOCKING   = 1<<0;
    const unsigned long OPEN_UNBUFFERED = 1<<1;

    /**
     * Open an input stream on this transport.
     *
     * @param aFlags
     *        optional transport specific flags.
     * @param aSegmentSize
     *        if OPEN_UNBUFFERED is not set, then this parameter specifies the
     *        size of each buffer segment (pass 0 to use default value).
     * @param aSegmentCount
     *        if OPEN_UNBUFFERED is not set, then this parameter specifies the
     *        maximum number of buffer segments (pass 0 to use default value).
     */
    nsIInputStream openInputStream(in unsigned long aFlags,
                                   in unsigned long aSegmentSize,
                                   in unsigned long aSegmentCount);

    /**
     * Open an output stream on this transport.
     *
     * @param aFlags
     *        optional transport specific flags.
     * @param aSegmentSize
     *        if OPEN_UNBUFFERED is not set, then this parameter specifies the
     *        size of each buffer segment (pass 0 to use default value).
     * @param aSegmentCount
     *        if OPEN_UNBUFFERED is not set, then this parameter specifies the
     *        maximum number of buffer segments (pass 0 to use default value).
     */
    nsIOutputStream openOutputStream(in unsigned long aFlags,
                                     in unsigned long aSegmentSize,
                                     in unsigned long aSegmentCount);

    /**
     * Close the transport and any open streams.
     *
     * @param aReason
     *        the reason for closing the stream.
     */
    void close(in nsresult aReason);

    /**
     * Set the transport event sink.
     *
     * @param aSink
     *        receives transport layer notifications
     * @param aEventQ
     *        indicates the event queue to which the notifications should
     *        be delivered.  if NULL, then the notifications may occur on
     *        any thread.  (NOTE: the event queue must be resolved.)
     */
    void setEventSink(in nsITransportEventSink aSink,
                      in nsIEventQueue aEventQ); 
    
    /**
     * Generic nsITransportEventSink status codes.  nsITransport
     * implementations may override these status codes with their own more
     * specific status codes (e.g., see nsISocketTransport).
     */
    const unsigned long STATUS_READING = 0x804b0008;
    const unsigned long STATUS_WRITING = 0x804b0009;
};

[scriptable, uuid(561de8af-1b74-4cd4-8479-89447d48185c)]
interface nsITransportEventSink : nsISupports
{
    /**
     * Transport status notification.
     *
     * @param aTransport
     *        the transport sending this status notification.
     * @param aStatus
     *        the transport status (resolvable to a string using
     *        nsIErrorService).
     * @param aProgress
     *        the amount of data either read or written depending on the value
     *        of the status code.  this value is relative to aProgressMax.
     * @param aProgressMax
     *        the maximum amount of data that will be read or written.  if
     *        unknown, 0xFFFFFFFF will be passed.
     */
    void onTransportStatus(in nsITransport aTransport,
                           in nsresult aStatus,
                           in unsigned long aProgress,
                           in unsigned long aProgressMax);
};