examples/Base/IPC/AdvancedClientServerExample/ProcessServer/src/processserversession.cpp

/*
Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies). All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright notice, this
  list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
  this list of conditions and the following disclaimer in the documentation
  and/or other materials provided with the distribution.
* Neither the name of Nokia Corporation nor the names of its contributors
  may be used to endorse or promote products derived from this software
  without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Description:  
*/


#include "processserversession.h"


/*****************CProcessServerSession**********************/
CProcessServerSession* CProcessServerSession::NewL(CProcessServer& aServer)
        {
        CProcessServerSession* s = new(ELeave) CProcessServerSession(aServer);
        CleanupStack::PushL(s);
        s->ConstructL();
        CleanupStack::Pop();
        return s;       
        }
CProcessServerSession::CProcessServerSession(CProcessServer& aServer)
:iServer(aServer)
        {
        
        }

void CProcessServerSession::ConstructL()
        {
        }
CProcessServerSession::~CProcessServerSession()
        {
        delete iAsyncRequestHandler;            
        iServer.CloseLogicalChannel();
        iServer.DecrementRefCount();
        }
void CProcessServerSession::CreateL()
//
// 2nd phase constructor for sessions - called by the CServer framework
//
        {
        iServer.IncrementRefCount();            
        //load dummy ldd
        User::LeaveIfError(iServer.LoadDevice());
        iAsyncRequestHandler = CAsyncHandler::NewL(iServer);    
        }
void CProcessServerSession::ServiceL(const RMessage2& aMessage)
        {
        TInt r = KErrNone;
        switch(aMessage.Function())
                {                               
                case ELoadDeviceDriver:
                        aMessage.Complete(iServer.LoadDevice());
                        break;
                
                case EOpenDriver:
                        aMessage.Complete(iServer.OpenLogicalChannel());
                        break;
                        
                case EDummyLDDSendData: //async
                        r = iAsyncRequestHandler->ProcessRequest(aMessage);
                        if (r!=KErrNone)
                                aMessage.Complete(r);
                        break;
                        
                case EDummyLDDSendDataCancel: //cancel async
                        iAsyncRequestHandler->Cancel(); 
                        aMessage.Complete(KErrNone); 
                        break;
                        
                case EUnloadDeviceDriver:
                        aMessage.Complete(iServer.UnloadDevice());
                        break;
                        
                default:
                        User::Leave(KErrNotSupported);
                        break;
                }

        }
                


/*****************CAsyncHandler**********************/
CProcessServerSession::CAsyncHandler* CProcessServerSession::CAsyncHandler::NewL(CProcessServer& aServer)
        {
        CAsyncHandler* self = new(ELeave) CAsyncHandler(aServer);
        CleanupStack::PushL(self);
        self ->ConstructL();
        CleanupStack::Pop();
        return self;
        }
CProcessServerSession::CAsyncHandler::~CAsyncHandler()
        {
        Cancel();
        iMessageArray.Close();
        }
void CProcessServerSession::CAsyncHandler::RunL()
        {
        // complete the request
        Complete(iStatus.Int());
        
        //continue to execute next request if there is any
        ExecuteFirstRequestInArray();
        }
void CProcessServerSession::CAsyncHandler::DoCancel()
        {
        iServer.CancelSendData();
        // complete the request
        Complete(iStatus.Int());
        }
CProcessServerSession::CAsyncHandler::CAsyncHandler(CProcessServer& aServer)
        :CActive(EPriorityStandard), iServer(aServer)
        {
        CActiveScheduler::Add(this);
        }

void CProcessServerSession::CAsyncHandler::ConstructL()
        {
        
        }
TInt CProcessServerSession::CAsyncHandler::ProcessRequest(const RMessage2& aMessage)
        {
        TInt ret;
        //store message
        TMessage newMessage;
        newMessage.Message() = aMessage;
        ret= iMessageArray.Append(newMessage);
        if (ret != KErrNone)
                return ret;
        
        // kick off the first request in the array when there is only one in the array 
        if (iMessageArray.Count() == 1) 
                ret= ExecuteFirstRequestInArray();

        return ret;
        }
TInt CProcessServerSession::CAsyncHandler::ExecuteFirstRequestInArray()
        {
        TInt r = KErrNone;
        if (iMessageArray.Count() != 0)
                {
                const RMessage2& message = iMessageArray[0].Message();
                switch (message.Function())
                        {
                        case EDummyLDDSendData:
                                {
                                TBuf8<KMaxMessageLen> sendObject;
                                r= message.Read(0, sendObject);
                                if (r == KErrNone)
                                        {
                                        r = iServer.SendDataToDevice(iStatus, sendObject);
                                        if (r==KErrNone)
                                                SetActive();
                                        }
                                }
                                break;
                        
                        default:
                                break;
                        }
                
                }
        return r; 
        }
void CProcessServerSession::CAsyncHandler::Complete(TInt aResult)
        {
        iMessageArray[0].Message().Complete(aResult);
        iMessageArray.Remove(0);
        iServer.UpdateDriverState(CProcessServer::ELogicalChannelOpened);
        }

/***************TMessage****************/
const RMessage2& CProcessServerSession::CAsyncHandler::TMessage::Message() const
        {
        return iMessage;
        }
        
RMessage2& CProcessServerSession::CAsyncHandler::TMessage::Message()
        {
        return iMessage; 
        }

//EOF

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