natfw/natfwstunturnclient/src/casynccallback.cpp
author hgs
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/*
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* Copyright (c) 2005 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:    
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*
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*/
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#include "natfwstunclientobserver.h"
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#include "casynccallback.h"
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#include "stunassert.h"
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// -----------------------------------------------------------------------------
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// CAsyncCallback::NewL
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// -----------------------------------------------------------------------------
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//
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CAsyncCallback* CAsyncCallback::NewL( MSTUNClientObserver& aObserver )
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    {
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    CAsyncCallback* self = new (ELeave) CAsyncCallback( aObserver );
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    CActiveScheduler::Add( self );
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    self->WaitForRequests();
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    return self;
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    }
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// -----------------------------------------------------------------------------
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// CAsyncCallback::CAsyncCallback
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// -----------------------------------------------------------------------------
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//
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CAsyncCallback::CAsyncCallback( MSTUNClientObserver& aObserver ) :
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    CActive( EPriorityStandard ),
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    iObserver( aObserver ),
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    iPendingCallbacks( _FOFF( TSTUNCallbackInfo, iLink ) )
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    {
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    }
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// ---------------------------------------------------------------------------
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// CAsyncCallback::CAsyncCallback
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// Dummy implementation. Default constructor is declared private and not used.
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// ---------------------------------------------------------------------------
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//
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CAsyncCallback::CAsyncCallback() :
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    CActive( EPriorityStandard ),
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    iObserver( *( MSTUNClientObserver* )0x1 )
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    {
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    }
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// ---------------------------------------------------------------------------
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// CAsyncCallback::CAsyncCallback
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// Dummy implementation, as copy constructor is declared private and not used.
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// ---------------------------------------------------------------------------
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//
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CAsyncCallback::CAsyncCallback( const CAsyncCallback& aAsyncCallback ) :
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    CActive( EPriorityStandard ),
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    iObserver( aAsyncCallback.iObserver )
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    {    
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    }
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// -----------------------------------------------------------------------------
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// CAsyncCallback::~CAsyncCallback
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// -----------------------------------------------------------------------------
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//
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CAsyncCallback::~CAsyncCallback()
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    {
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    Cancel();
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    TSTUNCallbackInfo* callback = iPendingCallbacks.First();
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    while ( iPendingCallbacks.IsFirst( callback ) &&
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            !iPendingCallbacks.IsEmpty() )
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        {
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        iPendingCallbacks.Remove( *callback );
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        delete callback;
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        callback = iPendingCallbacks.First();
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        }
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    }
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// -----------------------------------------------------------------------------
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// CAsyncCallback::DoCancel
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// -----------------------------------------------------------------------------
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//
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void CAsyncCallback::DoCancel()
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    {
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    if ( iStatus == KRequestPending )
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        {
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        TRequestStatus* status = &iStatus;    
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        User::RequestComplete( status, KErrCancel );
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        }
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    }
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// -----------------------------------------------------------------------------
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// CAsyncCallback::RunL
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// -----------------------------------------------------------------------------
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//
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void CAsyncCallback::RunL()
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    {
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    WaitForRequests();
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    ExecuteFirstCallback();
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    }
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// -----------------------------------------------------------------------------
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// CAsyncCallback::RunError
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// Currently RunL cannot leave.
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// -----------------------------------------------------------------------------
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//
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TInt CAsyncCallback::RunError( TInt aError )
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    {
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    if ( aError == KErrNoMemory )
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        {
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        return aError;
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        }
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    return KErrNone;
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    }
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// -----------------------------------------------------------------------------
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// CAsyncCallback::MakeCallbackL
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// -----------------------------------------------------------------------------
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//
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void CAsyncCallback::MakeCallbackL( TSTUNCallbackInfo::TFunction aFunction,
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                                    const CBinding* aBinding,
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                                    TInt aErrorCode,
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                                    const CSTUNClient* aClient )
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    {    
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    TSTUNCallbackInfo* callback = new ( ELeave ) TSTUNCallbackInfo( aFunction,
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                                                                    aBinding,
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                                                                    aErrorCode,
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                                                                    aClient );
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    CleanupStack::PushL( callback );
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    __STUN_ASSERT_L( callback->Validate(), KErrArgument );
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    CleanupStack::Pop( callback );
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    //CActive::iActive won't tell whether User::RequestComplete has already
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    //been called, so iStatus is inspected to see whether a previous call to
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    //AddDeleteRequestL has already called User::RequestComplete.
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    if ( iStatus == KRequestPending )
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        {
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        Wakeup();
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        }
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    iPendingCallbacks.AddLast( *callback );
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    }
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// -----------------------------------------------------------------------------
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// CAsyncCallback::CancelCallback
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// -----------------------------------------------------------------------------
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//
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void CAsyncCallback::CancelCallback( const CBinding& aBinding )
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    {
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    TSglQueIter<TSTUNCallbackInfo> iter( iPendingCallbacks );
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    for ( TSTUNCallbackInfo* callback = iter++; callback; callback = iter++ )
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        {
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        if ( callback->iBinding == &aBinding )
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            {
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            iPendingCallbacks.Remove( *callback );
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            delete callback;
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            }
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        }
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    }
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// -----------------------------------------------------------------------------
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// CAsyncCallback::ExecuteFirstCallback
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// Handle one callback request and wait for the next one. If there are more
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// callbacks, complete the asynchronous request so that RunL will soon be called
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// again. Don't call more than one callback, since upper layer might've deleted
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// STUN client, causing CAsyncCallback to be deleted too. For the same reason
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// nothing is done after executing the callback.
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// -----------------------------------------------------------------------------
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//    
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void CAsyncCallback::ExecuteFirstCallback()
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    {
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    TSTUNCallbackInfo* callback = iPendingCallbacks.First();
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    if ( iPendingCallbacks.IsFirst( callback ) &&
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         !iPendingCallbacks.IsEmpty() )
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        {
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        iPendingCallbacks.Remove( *callback );
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        if ( !iPendingCallbacks.IsEmpty() )
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            {
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            Wakeup();
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            }
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        callback->Execute( iObserver );
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        delete callback;
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        }
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    }
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// -----------------------------------------------------------------------------
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// CAsyncCallback::WaitForRequests
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// -----------------------------------------------------------------------------
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//
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void CAsyncCallback::WaitForRequests()
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    {
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    __STUN_ASSERT_RETURN( !IsActive(), KErrNotReady );
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   205
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    iStatus = KRequestPending;
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    SetActive();
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    }
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// -----------------------------------------------------------------------------
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// CAsyncCallback::Wakeup
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// -----------------------------------------------------------------------------
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//
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void CAsyncCallback::Wakeup()
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    {
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    TRequestStatus* status = &iStatus;
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    User::RequestComplete( status, KErrNone );
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    }