peerlistpump.cpp

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/*
 * peerlistpump.cpp,v 1.5 2004/01/08 13:20:22 mattid Exp
 *
 * COBAIN - Communications API for EPOC Environments
 * Copyright (C) 2002-2004 Matti Dahlbom, Matti Kokkola
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Contact: Matti Dahlbom <matti@777-team.org>
 *          Matti Kokkola <matti.kokkola@iki.fi>
 */

#include "peerlistpump.h"
#include "clientsession.h"
#include "clientservercommon.h"

CPeerListPump::CPeerListPump(TProtocol aProtocol, RCobainClientSession &aClientSession)
    : CActive(CActive::EPriorityStandard),
      iProtocol(aProtocol),
      iClientSession(aClientSession),
      iOperationStatus(ENone),
      iNextPeerOrdinal(-1)
{
    CActiveScheduler::Add(this);
}

CPeerListPump::~CPeerListPump()
{
    // must not delete
    iListener = NULL;

    Deque();
}

void CPeerListPump::DiscoverPeers(TUint aServiceClassID, MNetworkDriverListener *aListener)
{
    iServiceClassID = aServiceClassID;
    iListener = aListener;

    iOperationStatus = ECountPeers;
    iClientSession.DiscoverPeers(iProtocol, aServiceClassID, &iPeerCountBuffer, iStatus);
    SetActive();
}

void CPeerListPump::AddPeerToListL()
{
    // see if we need to allocate the peer list
    if( iPeerList == NULL ) {
        iPeerList = new (ELeave) TPeerList();
    }

    TPeerData data = iPeerDataBuffer();

    CNetworkPeer *peer = CNetworkPeer::NewL(iClientSession, 
                                            iProtocol,
                                            data);

    iPeerList->Append(peer);
}

void CPeerListPump::RunL()
{
    TInt ret = iStatus.Int();
    if( ret != KErrNone ) {
        iListener->PeerListRetrievalFailed(ret);
        return;
    }

    switch( iOperationStatus ) {
        case ECountPeers:
            iNumPeers = iPeerCountBuffer();
            if( iNumPeers == 0 ) {
                // return empty list
                TPeerList *list = new (ELeave) TPeerList();
                iListener->PeerListComplete(list);
            } else {
                // start fetching peers
                iNextPeerOrdinal = 0;
                iOperationStatus = EFetchPeer;
                iClientSession.FetchPeerData(iNextPeerOrdinal, &iPeerDataBuffer, iStatus);
                SetActive();
            }
            break;
        case EFetchPeer:
            // add the fetched peer to peer list
            AddPeerToListL();

            // if peers left to fetch, get the next one
            iNextPeerOrdinal++;
            if( iNextPeerOrdinal < iNumPeers ) {
                iOperationStatus = EFetchPeer;
                iClientSession.FetchPeerData(iNextPeerOrdinal, &iPeerDataBuffer, iStatus);
                SetActive();
            } else {
                // all peers fetched; return the list
                iListener->PeerListComplete(iPeerList);

                // forget about the list; client must release it
                iPeerList = NULL;
                iNextPeerOrdinal = -1;
                iOperationStatus = ENone;
            }

            break;
    }
}

void CPeerListPump::DoCancel()
{
    Log::Print(_L("CPeerListPump::DoCancel()"));

    // return empty list
    TPeerList *list = new (ELeave) TPeerList();
    iListener->PeerListComplete(list);
}

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