/*

* Copyright (c) 2006-2007 Nokia Corporation and/or its subsidiary(-ies). 

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:  Processor object for running harvester requests

*

*/

#include "harvesterrequestqueue.h"

#include "harvesterrequestactive.h"

#include "harvesterlog.h"

// maximum number of active client requests ( 18 burst images + 1 video )

const TUint KMaxClientRequests = 19;

// ======== MEMBER FUNCTIONS ========

// ---------------------------------------------------------------------------

// CHarvesterRequestQueue::NewL()

// Two-phased constructor.

// ---------------------------------------------------------------------------

//

CHarvesterRequestQueue* CHarvesterRequestQueue::NewL()

    {

    CHarvesterRequestQueue* self = new( ELeave )CHarvesterRequestQueue();

    CleanupStack::PushL( self );

    self->ConstructL();

    CleanupStack::Pop( self );

    return self;

    }

// ---------------------------------------------------------------------------

// CHarvesterRequestQueue::CHarvesterRequestQueue()

// C++ default constructor can NOT contain any code, that might leave.

// ---------------------------------------------------------------------------

//

CHarvesterRequestQueue::CHarvesterRequestQueue(): CActive( CActive::EPriorityUserInput )

    {

    CActiveScheduler::Add( this );

    }

// ---------------------------------------------------------------------------

// CHarvesterRequestQueue::ConstructL()

// Symbian 2nd phase constructor can leave.

// ---------------------------------------------------------------------------

//

void CHarvesterRequestQueue::ConstructL()

    {

    iActiveRequests = 0;

    iShutdown = EFalse;

    }

// ---------------------------------------------------------------------------

// CHarvesterRequestQueue::~CHarvesterRequestQueue()

// Destructor.

// ---------------------------------------------------------------------------

//

CHarvesterRequestQueue::~CHarvesterRequestQueue()

    {

    WRITELOG( "CHarvesterRequestQueue::~CHarvesterRequestQueue()");

    Cancel();

    iRequests.ResetAndDestroy();

    WRITELOG( "CHarvesterRequestQueue::~CHarvesterRequestQueue() - All requests deleted");

    }

// ---------------------------------------------------------------------------

// CHarvesterRequestQueue::Process()

// Activates next request if possible.

// ---------------------------------------------------------------------------

//

void CHarvesterRequestQueue::Process()

    {

    WRITELOG( "CHarvesterRequestQueue::Process()");

    if ( !IsActive() && !iShutdown && (iActiveRequests < KMaxClientRequests) )

        {  

        SetActive();

        TRequestStatus* statusPtr = &iStatus;

        User::RequestComplete( statusPtr, KErrNone );

        }

    }

// ---------------------------------------------------------------------------

// CHarvesterRequestQueue::AddRequestL()

// Adds new request to the queue.

// ---------------------------------------------------------------------------

//

void CHarvesterRequestQueue::AddRequestL( CHarvesterRequestActive* aRequest )

    {

    WRITELOG( "CHarvesterRequestQueue::AddRequestL()");

    iRequests.AppendL( aRequest );

    }

// ---------------------------------------------------------------------------

// CHarvesterRequestQueue::RunL()

// ---------------------------------------------------------------------------

//

void CHarvesterRequestQueue::RunL()

    {

    WRITELOG2( "CHarvesterRequestQueue::RunL() begin - requests: %d, active requests: %d",

               iRequests.Count(), iActiveRequests );

    const TInt status = iStatus.Int();

    if ( status >= KErrNone && !iShutdown )

        {

        CHarvesterRequestActive* selectedRequest = NULL;

            {

            CHarvesterRequestActive* request = iRequests[i];

            // remove completed tasks    

            if ( !request || (request->RequestCompleted() && !request->IsActive()) )

                {

                // delete completed task

                delete request;

                request = NULL;

                iRequests.Remove( i );

                // correct the index so that no tasks are skipped

                i--;

                WRITELOG( "CHarvesterRequestQueue::RunL() - removing completed request");

                }

            // select priorised task

            else

                {

                // not yet activated

                if( !request->IsActive() )

                     {

                    selectedRequest = request;

                    break;

                    }

                }

            }

        // activate selected

        if ( selectedRequest && !iShutdown )

            {

            iActiveRequests++;

            selectedRequest->Start();

            }

#ifdef _DEBUG        

        WRITELOG2( "CHarvesterRequestQueue::RunL() end - requests: %d, active requests: %d",

                iRequests.Count(), iActiveRequests );

#endif

        // continue processing if needed

        if ( !iShutdown && (iActiveRequests < KMaxClientRequests)  && 

                (iRequests.Count() > iActiveRequests))

            {  

            SetActive();

            TRequestStatus* statusPtr = &iStatus;

            User::RequestComplete( statusPtr, KErrNone );

            }

        else

            {

            iRequests.Compress();

            }

        }

    else if( status != KErrCancel )

        {

        // continue processing if needed

        if ( !iShutdown && (iActiveRequests < KMaxClientRequests)  && 

                (iRequests.Count() > iActiveRequests))

            {  

            SetActive();

            TRequestStatus* statusPtr = &iStatus;

            User::RequestComplete( statusPtr, KErrNone );

            }

        }

    }

// ---------------------------------------------------------------------------

// Handle any error from RunL

// ---------------------------------------------------------------------------

//

TInt CHarvesterRequestQueue::RunError( TInt aError )

    {

    WRITELOG1( "CHarvesterRequestQueue::RunError() - %d", aError);

    if (aError)

        {

        iActiveRequests--;

        if(iActiveRequests <= -1)

            {

            iActiveRequests = 0;

            }

        }

    return KErrNone;

    }

// ---------------------------------------------------------------------------

// CHarvesterRequestQueue::DoCancel()

// ---------------------------------------------------------------------------

//

void CHarvesterRequestQueue::DoCancel()

    {

    WRITELOG( "CHarvesterRequestQueue::DoCancel()");

    iShutdown = ETrue;

    const TInt count( iRequests.Count() );

    for( TInt i = 0; i < count; i++ )

        {

        CHarvesterRequestActive* request = iRequests[i];

        if( request )

            {

            request->Cancel();

            }

        }

    }

// ---------------------------------------------------------------------------

// CHarvesterRequestQueue::RequestComplete()

// Completes the request

// ---------------------------------------------------------------------------

//

void CHarvesterRequestQueue::RequestComplete()

    {

    WRITELOG( "CHarvesterRequestQueue::RequestComplete()");

    iActiveRequests--;

    if(iActiveRequests <= -1)

        {

        iActiveRequests = 0;

        }

    WRITELOG1( "CHarvesterRequestQueue::RequestComplete() - active requests: %d", iActiveRequests );

    // clean completed request and possibly process next

    if ( !IsActive() && !iShutdown )

        {  

        SetActive();

        TRequestStatus* statusPtr = &iStatus;

        User::RequestComplete( statusPtr, KErrNone );

        }

    }

// ---------------------------------------------------------------------------

// CHarvesterRequestQueue::ForceRequests()

// ---------------------------------------------------------------------------

//

void CHarvesterRequestQueue::ForceRequests()

    {

    WRITELOG( "CHarvesterRequestQueue::ForceRequests()");

    for ( TInt i = 0; i < iRequests.Count(); i++ )

        {

        CHarvesterRequestActive* request = iRequests[i];

        if ( request && !request->RequestCompleted() )

            {

			request->ForceHarvest();

			}

        // delete completed task

        delete request;

        request = NULL;

        iRequests.Remove( i );

        // correct the index so that no tasks are skipped

        i--;

        if(i <= -1)

            {

            i = -1;

            }

        }

    }

// ---------------------------------------------------------------------------

// CHarvesterRequestQueue::DoCancel()

// ---------------------------------------------------------------------------

//

TBool CHarvesterRequestQueue::RequestsPending()

    {

    if( iRequests.Count() > 0 )

        {

        return ETrue;

        }

    return EFalse;

    }

// End of file